Steam Injection Humidifiers - Pure Humidifier
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Sheet No.
SI-1
Steam Injection Humidifiers PURE Humidifier Co. Steam Injection Humidifiers are “job-engineered” to assure highly efficient steam release into the air stream. Each humidifier is designed for your specific capacity, steam pressure, and duct size requirements. Single and multiple injection tube units are available to meet the most demanding applications.
Our unique round injection tube requires 80% less welding than rectangular designs and provides 100% steam jacketing of the inner tube. This design creates a stronger and more aerodynamic tube with less metal fatigue and improved air-to-steam characteristics. The increased steam jacketing area provides a hotter tube which delivers PURE steam free of condensate.
High quality control valves and actuators assure accurate response and metering of steam flow. If you prefer to use your own valves and actuators, we will factory mount them for you. Or, if you have a preference for certain valve/actuator combinations, we can usually supply them with the humidifier. Just another way we “job-engineer” the humidifiers to meet your needs.
All PURE Humidifier Co. Steam Injection Humidifiers are equipped with our patented centrifugal steam separator (patent no. 4,509,965). This light weight stainless steel separator completely removes all condensate from the humidification system and provides instantaneous warm-up.
Only high quality corrosion resistant stainless steel is used in the construction of the separator and injection tube. Steam jacketing around the inner tubes means any condensate is “flashed off”. Only PURE steam is delivered, free of water or particulate matter.
A variety of piping options gives you the flexibility of installing the PURE Humidifier Co. Steam Injection Humidifier in confined spaces. The versatility of our steam injection humidifier will allow you to design them into any system simply, efficiently, and reliably.
Separator Injection Tube Steam Control Valve and Actuator
Our results are comforting
Sheet No.
SI-2
All PURE Humidifier Co. Steam Injection Humidifiers are designed with a steam jacketed injection tube(s) and a patented centrifugal steam separator (patent no. 4,509,965). Used in combination with each other, these components ensure the delivery of condensate free, PURE steam, into the air stream. Single Tube, Multiple Tube, Mini-Mult, and Area Type humidifiers all operate with the same basic design. However, the steam path is slightly different in the Single Tube and Area Type humidifiers versus the Multiple Tube and Mini-Mult humidifier.
Figure C
Centrifugal Baffle
Outlet
Inlet/Outlet Baffle
Inlet “C” Condensate Connection
Figure A—Single Tube Strainer
“A”
In the Single Tube and Area Type humidifiers, the steam enters the humidifier through the strainer and travels into the injection tube outer jacket at connection “A” (reference Fig. A). The steam then continues to circulate around the outer jacket of the injection tube and leaves the tube jacket at outlet “B”. The steam then travels through the interconnecting piping to the inlet of the steam separator (connection “C”).
Valve
“B”
Injection Tube
Separator
PURE Steam
Trap
Steam/Condensate
Figure B—Multiple Tube
Inside the separator, the combination of steam and condensate is directed into a circular flow by the internal baffle (reference Fig. C). The condensate, being heavier than the steam, is forced to the outside wall by the centrifugal force created within the separator and is removed from the system by a steam trap. The PURE steam, free of condensate, then rises past the inlet/outlet baffle and flows out of the separator to the control valve (reference Fig. C). On a call for humidity the control valve opens and allows the proper quantity of PURE steam to flow into the jacketed inner tube and thus be emitted out of the injection tube into the air stream (reference Fig. A).
Strainer “A” Valve
Injection Tubes
“B” “A”
“C”
“B” Trap Trap
Separator
In the case of Multiple Tube and Mini-Mult humidifiers, the only variation is that, after the strainer, the steam supply is piped directly to the inlet of the separator (reference Fig. B). An auxiliary steam supply is piped to the first injection tube to provide the steam jacketing. The auxiliary steam supply circulates around the injection tubes and is independently trapped (reference Fig. B). The injection tubes are piped and trapped separately to ensure that the additional resistance created by the extra piping does not reduce the steam supply to the humidifier. This also provides extra trap capacity to handle the additional condensate created within the multiple injection tube steam jackets.
Sheet No.
SI-3
Single Tube Humidifier Selection Single injection tube humidifiers from PURE Humidifier Co. are factory piped and assembled (after piping at the factory, units over four feet (10.2 cm) in length are disassembled at the unions for ease of shipping).
Example
Total humidification load = 76lbs/hr @ 10 psig Number of injection tubes required = 1 Duct width = 5 ft (12.7 cm); Pneumatic valve required
From Table 1 you will see that a Model 50-10 is required. Adding the proper prefix and suffix;
To properly select a single tube humidifier: 1. Select the correct model from Table 1 by referencing the steam supply pressure and humidification load required in lbs/hr. 2. Add the required valve actuator prefix and injection tube insertion length suffix to the model number (reference “Model Nomenclature”)
The correct model number would be: P50-10-5’-1
Fig. D—Single Tube Humidifier Steam Supply Connection
Duct Example:
Mounting Bracket †
P50 - 10 - 2’ - 1
Strainer †
Quantity of Injection Tubes Tube Length (in feet) Tube Model Number Separator Model Number Type of Valve Control; P = Pneumatic M = Electric Modulating E = Electric On-Off
Separator †
Injection Tube †
NOTES: 1. All dashed line piping is by others. 2. † = PURE Humidifier Co.. 3. Reference page SI-4 for Single Tube model dimensions and weights.
Steam Trap †
Steam Emission Ports Steam Control Valve and Actuator † 3/4”-NPT Condensate Connection
Table 1 Single Injection Tube Humidifier Stream Capacity in pounds per hour (lbs/hr) Model Number
50-10
60-20
70-20
80-30
Steam Pressure to Humidifier Supply Connection in psig
Valve Cv (Size-NPT)
2
3
4
5
6
7
8
9
10
11
12
13
14
15
20
25
30
35
40
45
50
55
60
.10 (1/2”)
1.6
1.9
2.3
2.6
2.8
3.0
3.2
3.4
3.6
3.8
4.0
4.2
4.3
4.4
5.1
5.7
6.3
6.8
7.3
7.7
8.1
8.5
8.9
.22 (1/2”)
3.5
4.2
5.0
5.6
6.5
6.6
7.1
7.6
8
8
9
9
10
10
11
13
14
15
16
17
18
19
20
.40 (1/2”)
6.4
7.6
9.1
10
11
12
13
14
15
15
16
16
17
18
20
23
25
27
29
31
33
34
36
.75 (1/2”)
12
14
17
19
21
23
24
26
27
28
30
31
32
33
38
43
47
50
54
57
60
63
66
.95 (1/2”)
15
18
21
24
27
29
31
33
34
36
38
39
40
42
48
54
59
64
68
72
76
80
84
1.30 (1/2”)
21
24
29
33
36
39
42
44
47
49
51
53
55
57
66
74
80
87
93
99
104
109
114
1.75 (1/2”)
28
33
40
44
49
52
56
60
63
66
69
72
74
76
88
99
107
116
124
132
139
146
153
2.20 (1/2”)
35
41
50
55
61
66
71
75
79
82
86
90
93
95
111
123
134
146
156
165
174
183
192
2.80 (1/2”)
45
53
64
70
78
84
90
96
100
104
109
114
118
121
141
157
171
186
199
210
221
233
244
3.25 (1/2”)
52
61
73
82
90
96
104
110
116
121
127
132
137
140
163
181
198
214
229
244
257
270
282
4.40 (1/2”)
70
83
98
110
121
130
141
149
157
163
172
178
185
190
221
244
266
290
310
328
345
363
381
5.50 (3/4”)
85
104
123
138
150
161
176
186
196
204
213
222
231
236
275
305
333
360
385
408
430
451
471
6.20 (3/4”)
96
117
138
155
169
182
198
210
220
230
240
250
259
265
310
343
372
403
434
459
485
508
529
7.50 (3/4”)
116
142
166
186
204
220
238
253
265
277
289
302
312
320
373
412
450
487
525
555
585
614
640
8.20 (1”)
123
155
180
204
223
240
261
275
290
303
313
328
341
349
407
443
488
529
570
603
635
668
703
10.0 (1”)
150
189
220
248
272
293
317
335
354
370
380
400
414
423
497
540
595
645
695
735
770
810
850
12.0 (1”)
180
228
264
296
326
351
378
402
422
441
456
465
492
505
595
648
714
774
828
876
∆
∆
∆
20.0 (1-1/4”)
300
375
440
494
540
582
630
666
702
736
750
772
814
834
990
1060
1180
1280
1376
1460
∆
∆
∆
28.0 (1-1/2”)
420
511
612
686
756
812
873
927
980
1024
1044
1075
1128
1165
1383
1484
1638
1778
1912
2044
∆
∆
∆
Metric Conversion: lbs/hr x .4536 = kg/hr 1 psig x 6.895 = Kpa ∆ Special valve/actuator required; consult factory
Sheet No.
SI-4
Table 2 Single Injection Tube Humidifier Dimensions in inches (cm) Model Number
Dim “A”
Dim “B”
Dim “C”
50-10
4.5” (11.4)
1.5” (3.8)
3.0” (7.6)
12.0” (30.5)
8.5” (21.6)
13.25” (33.7)
1/2”-NPT
1/2”-NPT
60-20
5.5” (14.0)
2.0” (5.1)
3.5” (8.9)
14.375” (36.5)
9.25” (23.5)
14.75” (37.5)
3/4”-NPT
3/4”-NPT
70-20
6.5” (16.5)
2.0” (5.1)
3.5” (8.9)
16.375” (41.6)
10.25” (26.0)
16.25” (41.3)
3/4”-NPT
3/4”-NPT
80-30
7.5” (19.1)
3.0” (7.6)
4.75” (12.1)
19.0” (48.3)
11.75” (29.9)
21.5” (54.6)
1-1/4”-NPT
1-1/4”-NPT
Dim “D”†
Dim “E”
Dim “F”†
Strainer Size
Dim “G”
† Valve manufacturer, Cv, and actuator type will affect this dimension. The dimensions shown are based on an Invensys valve and pneumatic actuator.
Figure F Single Tube Dimensions
1.75” (4.5)
G Steam Supply
L Tube Insertion
Connection
Length
Figure E End View of Tube
C
F
A Dia.
B Tube Diameter E 2” (5.1) Minimum
B
3/4”—NPT Condensate Trap Connection
Mounting Configurations & Steam Emission Direction
D
Table 3 Insertion Lengths & Unit Weights
Air Flow
Figure 1
Figure 2
Horizontal Air Flow
Vertical Air Flow
Sep.
Left Hand Steam Emission
Air Flow
Sep.
Right Hand Steam Emission
Figure G— Plan View (Horizontal Duct)
Steam Emission Direction Steam emission should be into the air flow, except when an optional insulated injection tube is utilized (in which case the steam should emit with the air flow).
Dim “L”†† Insertion Length
Unit Weight by Model Number in pounds (kg) ∆∆
in inches (cm)
50-10
60-20
70-20
80-30
6” (15.2)
18.5 (8.4)
∆
∆
∆
12” (30.5)
19.0 (8.6)
21.5 (9.8)
25.0 (11.4)
∆
18” (45.7)
19.5 (8.9)
22.0 (10.0)
25.5 (11.6)
∆
24” (61.0)
20.0 (9.1)
22.5 (10.2)
26.0 (11.8)
∆
30” (76.2)
20.5 (9.3)
23.0 (10.4)
26.5 (12.0)
∆
36” (91.4)
21 (9.5)
23.5 (10.7)
27 (12.3)
43.5 (19.7)
48” (121.9)
22 (10.0)
24.5 (11.1)
28 (12.7)
45.0 (20.4)
60” (152.4)
23 (10.4)
25.5 (11.6)
29 (13.2)
46.5 (21.1)
72” (182.9)
24 (10.9)
26.5 (12.0)
30 (13.6)
48.0 (21.8)
84” (213.4)
25 (11.4)
27.5 (12.5)
31 (14.1)
49.5 (22.5)
96” (243.8)
26 (11.8)
28.5 (12.9)
32 (14.5)
51.0 (23.2)
On vertical air flow applications, the steam should emit upward, regardless of the air flow direction.
108” (274.3)
27 (12.3)
29.5 (13.4)
33 (15.0)
52.5 (23.8)
120” (304.8)
28 (12.7)
30.5 (13.9)
34 (15.4)
54.0 (24.5)
132” (335.3)
29 (13.2)
31.5 (14.3)
35 (15.9)
55.5 (25.2)
144” (365.8)
30 (13.6)
32.5 (14.8)
36 (16.3)
57.0 (25.9)
Tube piping direction (right or left hand emission) can be determined by referencing the Plan View (Horizontal Duct) drawing (Fig. G).
156” (396.2)
∆
33.5 (15.2)
37 (16.8)
58.5 (26.6)
168” (426.7)
∆
34.5 (15.7)
38 (17.3)
60.0 (27.2)
††
Standard insertion lengths. Special tube lengths are available; consult the factory for details. ∆ Indicates a special order item; consult factory for details. ∆∆ The weights shown include the separator, injection tube, valve, pneumatic actuator, strainer, and F & T trap.
Sheet No.
SI-5
Multiple Tube Humidifier Selection
Recommended Quantity of Injection Tubes
Multiple injection tube humidifiers from PURE Humidifier Co. include all the features of the single tube units. However, the separator/valve assembly and injection tubes are ordered separately to match the correct capacity for both the separator/valve assembly and the injection tubes.
When steam is emitted from the injection tube, it immediately condenses into tiny water droplets. As the steam (fog) travels downstream, the air slowly absorbs the condensed steam until all the water droplets have changed state back to a gas; this distance is called dissipation distance.
To properly select a multiple tube humidifier: 1. Select the correct separator/valve assembly from Table 4 by referencing the steam supply pressure and humidification load required in lbs/hr. 2. Select the proper injection tube model from Table 5 by referencing the steam supply pressure and humidification load required per injection tube (total load ÷ qty. of tubes desired). Reference the “Recommended Quantity of Injection Tubes” section on this page to assist in determining the quantity of injection tubes required.
In many installations a single injection tube will provide the dissipation distance required. However, there are applications where the conditions necessitate the use of multiple injection tubes to achieve a shorter dissipation distance.
Example
To prevent condensation on in-duct objects, such as dampers, coils, filters, or turning vanes, it is very important that the dissipation distance be shorter than the distance from the humidifier to the in-duct object. The following recommendations should be used when designing a multiple injection tube system:
Total humidification load = 383 lbs/hr @ 10 psig Number of injection tubes required = 2 Injection tube humidification capacity = 191.5 Duct width = 60” (5’); Pneumatic valve required.
Recommended Qty. of Tubes † Duct Height Up to 36” …………………………………. 2 37” - 48” …………………………………. 3 49” - 72” …………………………………. 4 73” - 96” …………………………………. 5 Above 96” …………………………………. 6
From Table 4 you will see that a Model 70 Separator/Valve assembly is required. From Table 5 you will see that a model 10 injection tube, at 10 psig can emit the required tube humidification load. The correct model number would be:
† Final duct relative humidity air velocity and available dissipation distance will affect the quantity of tubes required.
P70-10-5’-2
Table 4 Multiple Tube Humidifier Separator / Valve Steam Capacity in pounds per hour (lbs/hr) Model Number
50
60
70
80 90
Steam Pressure to Humidifier Supply Connection in psig
Valve Cv (Size-NPT)
2
3
4
5
6
7
8
9
10
11
12
13
14
15
20
25
30
35
40
45
50
55
60
.10 (1/2”)
1.6
1.9
2.3
2.6
2.8
3.0
3.2
3.4
3.6
3.8
4.0
4.2
4.3
4.4
5.1
5.7
6.3
6.8
7.3
7.7
8.1
8.5
8.9
.22 (1/2”)
3.5
4.2
5.0
5.6
6.5
6.6
7.1
7.6
8
8
9
9
10
10
11
13
14
15
16
17
18
19
20
.40 (1/2”)
6.4
7.6
9.1
10
11
12
13
14
15
15
16
16
17
18
20
23
25
27
29
31
33
34
36
.75 (1/2”)
12
14
17
19
21
23
24
26
27
28
30
31
32
33
38
43
47
50
54
57
60
63
66
.95 (1/2”)
15
18
21
24
27
29
31
33
34
36
38
39
40
42
48
54
59
64
68
72
76
80
84
1.30 (1/2”)
21
24
29
33
36
39
42
44
47
49
51
53
55
57
66
74
80
87
93
99
104
109
114
1.75 (1/2”)
28
33
40
44
49
52
56
60
63
66
69
72
74
76
88
99
107
116
124
132
139
146
153
2.20 (1/2”)
35
41
50
55
61
66
71
75
79
82
86
90
93
95
111
123
134
146
156
165
174
183
192
2.80 (1/2”)
45
53
64
70
78
84
90
96
100
104
109
114
118
121
141
157
171
186
199
210
221
233
244
3.25 (1/2”)
52
61
73
82
90
96
104
110
116
121
127
132
137
140
163
181
198
214
229
244
257
270
282
4.40 (1/2”)
70
83
98
110
121
130
141
149
157
163
172
178
185
190
221
244
266
290
310
328
345
363
381
5.50 (3/4”)
85
104
123
138
150
161
176
186
196
204
213
222
231
236
275
305
333
360
385
408
430
451
471
6.20 (3/4”)
96
117
138
155
169
182
198
210
220
230
240
250
259
265
310
343
372
403
434
459
485
508
529
7.50 (3/4”)
116
142
166
186
204
220
238
253
265
277
289
302
312
320
373
412
450
487
525
555
585
614
640
8.20 (1”)
123
155
180
204
223
240
261
275
290
303
313
328
341
349
407
443
488
529
570
603
635
668
703
10.0 (1”)
150
189
220
248
272
293
317
335
354
370
380
400
414
423
497
540
595
645
695
735
770
810
850
12.0 (1”)
180
228
264
296
326
351
378
402
422
441
456
465
492
505
595
648
714
774
828
876
∆
∆
∆
20.0 (1-1/4”)
300
375
440
494
540
582
630
666
702
736
750
772
814
834
990
1060
1180
1280
1376
1460
∆
∆
∆
28.0 (1-1/2”)
420
511
612
686
756
812
873
927
980
1024
1044
1075
1128
1165
1383
1484
1638
1778
1912
2044
∆
∆
∆
40.0 (2”)
600
720
872
980
1080
1112
1240
1316
1392
1456
1480
1528
1592
1656
1964
2080
2320
2520
2720
2904
∆
∆
∆
35
40
45
50
55
Table 5 Injection Tube Steam Capacity per tube in pounds per hour (lbs/hr) Model Number
Steam Pressure to Humidifier Supply Connection in psig 2
3
4
5
6
7
8
9
10
11
12
13
14
15
20
25
30
60
10
95
115
134
153
167
181
195
209
225
238
251
263
276
289
302
315
328
341
354
367
380
393
406
20
184
222
266
309
340
371
402
433
463
491
519
546
574
602
630
658
686
714
742
770
798
826
854
30
333
416
489
575
661
681
734
787
840
893
946
999
1052
1105
1158
1211
1264
1317
1370
1423
1476
1529
1582
Metric Conversion: lbs/hr x .4536 = kg/hr 1 psig x 6.895 = Kpa ∆ Special valve/actuator required; consult factory
Sheet No.
SI-6
Table 6 Separator/Valve Assembly Dimensions & Weights (Ref. Fig. I) Model Number
Dim “A”
Dim “B”†
Dim “C”†
Dim “D”
Dim “E”
Dim “F”
50
4.5” (11.4)
13.25” (33.7)
8.75” (22.2)
5.50” (14.0)
1/2”-NPT
60
5.5” (14.0)
4.75” (37.5)
10.75” (27.3)
5.75” (14.6)
70
6.5” (16.5)
16.25” (41.3)
12.75” (32.4)
6.50” (16.5)
80
7.5” (19.1)
21.5” (54.6)
15.50” (39.4)
90
8.5” (21.6)
23.25” (59.0)
16.50” (41.9)
Weight
Strainer Size
in lbs (kg)
1/2”-NPT
1/2”-NPT
30 (13.7)
3/4”-NPT
3/4”-NPT
3/4”-NPT
32 (14.6)
1”-NPT
1”-NPT
1”-NPT
36 (16.4)
7.25” (18.4)
1-1/2”-NPT
1-1/2”-NPT
1-1/2”-NPT
50 (22.8)
7.50” (19.1)
2”-NPT
2”-NPT
2”-NPT
59 (26.9)
† Valve manufacturer, Cv and actuator type will affect this dimension. The dimensions are shown based on an Invensys valve and pneumatic actuator. The weights shown include: separator, valve, valve actuator, strainer, and two steam traps.
Fig. H—Injection Tube
Fig. I—Separator/Valve Assembly 1.75” (4.5)
K Tube Insertion
3/8-16 UNC Tube Support
E
Length
(NPT)
J (NPT)
A Dia.
D
B
I H Tube Diameter
H
2” (5.1) Minimum
F (NPT)
End View of Injection Tube
G
3/4”—NPT Condensate Trap
C
Table 7 Injection Tube Dimensions (Ref. Fig. H) Model Number
Dim “G”
Dim “H”
Dim “I”
Dim “J”
10
4.50” (11.4)
1.5” (3.8)
3.00” (7.6)
1/2”-NPT
20
4.75” (12.1)
2.0” (5.1)
3.50” (8.9)
3/4”-NPT
30
5.50” (14.0)
3.0” (7.6)
4.75” (12.1)
1-1/4”-NPT
Table 8 Insertion Lengths & Unit Weights Dim “K”†† Insertion Length
Unit Weight by Model Number in pounds (kg) ∆
in inches (cm)
10
20
30
6” (15.2)
.5 (.23)
∆
∆
12” (30.5)
1.0 (.45)
1.5 (.68)
∆
18” (45.7)
1.5 (.68)
2.0 (.391)
∆
24” (61.0)
2.0 (.91)
2.5 (1.1)
∆
30” (76.2)
2.5 (1.1)
3.0 (1.4)
∆
36” (91.4)
3.0 (1.4)
3.5 (1.6)
6.0 (2.7)
48” (121.9)
4.0 (1.8)
4.5 (2.0)
7.5 (3.4)
60” (152.4)
5.0 (2.3)
5.5 (2.5)
9.0 (4.1)
72” (182.9)
6.0 (2.7)
6.5 (3.0)
10.5 (4.8)
84” (213.4)
7.0 (3.2)
7.5 (3.4)
12 (5.5)
96” (243.8)
8.0 (3.6)
8.5 (3.9)
13.5 (6.1)
108” (274.3)
9.0 (4.1)
9.5 (4.3)
15.0 (6.8)
120” (304.8)
10 (4.5)
10.5 (4.8)
16.5 (7.5)
132” (335.3)
11 (5.0)
11.5 (5.2)
18.0 (8.2)
Piping Notes
144” (365.8)
12 (5.5)
12.5 (5.7)
19.5 (8.9)
1. 2. 3.
156” (396.2)
∆
13.5 (6.1)
21.0 (9.5)
168” (426.7)
∆
14.5 (6.6)
22.5 (10.2)
Fig. J — Piping Diagram Injection Tubes (typ.)
Strainer
E
Reference piping notes located in the lower right corner of this page.
J
Steam Supply
J E
J
J E
J
J
J
J Separator/Valve Assembly
3/4”-NPT
Reference Table 6 for pipe size “E” Trap Reference Table 7 for pipe size “K” ALL LINE PIPING IS BY OTHERS. Multiple injection tube humidifiers require field assembly/piping. If factory assembly/piping is required, consult the factory for the optional “Factory Assembled Multiple” (FAM)
3/4”-NPT Trap
†† Standard insertion lengths. Special tube lengths are available; consult the factory for details. ∆ Indicates a special order item; consult factory for details. Reference Fig. H for description of dimension “K”
Sheet No.
SI-7
Mini-Mult Humidifiers The Mini-Mult humidifier from PURE Humidifer Co. includes all of the features of the single tube units. However, the Mini-Mult humidifier is designed for applications that require small humidification loads in a small duct size.
The humidifiers are shipped completely assembled and ready for installation. They fit into a slot cut into the duct wall, and the slot is sealed with a factory duct plate. Specially designed low capacity valve Cv’s assure precise humidity control without over-humidification, valve “hunting”, or saturation. A complete line of pneumatic, electric modulating, and electric on-off controlled valve actuators are available.
They are ideally suited for any high humidity job where fast steam dissipation in cool air, in a short-run duct, is essential. That means hospital delivery rooms, the O.R., the I.C.U., or “clean rooms” in any high tech application.
Fig. K—Mini-Mult Side View
Fig. L—Mini-Mult Front View
11.75” (30.0)
7.75” (19.7)
B Tube Insertion Length
7.5” (19.1)
1/2”—NPT Steam Supply Conn.
(ref. note #2)
1/2”—NPT Steam Supply Conn.
A
4.75” (12.1)
10.50” (26.7) (ref. note #3)
(ref. note #1)
3” (7.6) Typ. Centers
3/4”—NPT Condensate Connection (see Side View)
3/4”—NPT F & T Style Condensate Steam Trap (shipped loose for field mounting); Typ. two per unit.
Fig. M—Injection Tube Optional 1/4” (.64) Insulation
Notes 1. 2. 3. 4. 5.
50-5
Valve Cv (Size-NPT) .10 (1/2”) .22 (1/2”) .40 (1/2”) .75 (1/2”) .95 (1/2”) 1.30 (1/2”) 1.75 (1/2”) 2.20 (1/2”) 2.80 (1/2”) 3.25 (1/2”) 4.40 (1/2”)
Insulated
Table 10 Recommended Qty of Tubes and Unit Weights
Steam Pressure to Humidifier Supply Connection in psig 2
3
4
5
6
7
8
9
10
11
12
13
14
15
1.6 3.5 6.4 12 15 21 28 35 45 52 70
1.9 4.5 7.6 14 18 24 33 41 53 61 83
2.3 5.0 9.1 17 21 29 40 50 64 73 98
2.6 5.6 10 19 24 33 44 55 70 82 110
2.8 6.5 11 21 27 36 49 61 78 90 121
3.0 6.6 12 23 29 39 52 66 84 96 130
3.2 7.1 13 24 31 42 56 71 90 104 141
3.4 7.6 14 26 33 44 60 75 96 110 149
3.6 8 15 27 34 47 63 79 100 116 157
3.8 8 15 28 36 49 66 82 104 121 163
4.0 9 16 30 38 51 69 86 109 127 172
4.2 9 16 31 39 53 72 90 114 132 178
4.3 10 17 32 40 55 74 93 118 137 185
4.4 10 18 33 42 57 76 95 121 140 190
Metric Conversion lbs/hr x .4536 = kg/hr 1 psig x 6.895 = kpa
1.25” (3.2)
Non-Insulated
Table 9 Mini-Mult Humidifier Steam Capacity in pounds per hour (lbs/hr) Model Number
1.5” (3.8)
1” (2.54)
Dim “A” varies between 4” (10.2 cm) for two tubes and 16” (40.6 cm) for six tubes; varies in 3” (7.6 cm) increments. Dim “B” varies between 6” (15.2 cm) and 48” (122.0 cm) in 2” (5.1 cm) increments, depending upon the insertion length. Reference Table 10 for standard insertion lengths. The overall height increases in 3” increments for each additional injection tube. Reference Table 10 for the recommended quantity of injection tubes. All dimensions are in inches (cm); all dimensions are for reference only. Dotted line piping is by others.
Duct Height in inches (cm)
Qty of Tubes
Weight in pounds (kg)∆∆
6-9” (15.2-22.7)
2
29.5 (13.5)
10-12” (25.4-30.5)
3
31.0 (14.1)
13-15” (33.0-38.1)
4
32.5 (14.7)
16-18” (40.6-45.7)
5
34.0 (15.4)
19.-24” (48.3-61.0)
6
35.5 (16.1)
∆∆ The weights shown include: the separator, injection tube, valve, pneumatic actuator, strainer, and two float & thermostatic traps.
Sheet No.
SI-8
Area Type Humidifiers
Fig. N—Area Type Reference piping notes located in the lower right corner of this page.
Area Type tube humidifiers from PURE Humidifier Co. include all the features of the single tube units. However, the Area Type humidifier is designed for applications that require direct humidification without the use of duct work. They are ideally suited for area humidity control in applications such as paper, textile, or wood manufacturing, as well as, printing plants and storage areas.
Electric Fan 115 vac single phase 9 watt / 3 amp.
The standard Area Type humidifier is provided with an electrically operated fan to mix the steam with the surrounding air. If humidity is required in an explosive environment, an optional pneumatically driven fan is available (consult the factory).
Steam Control Valve and Actuator Air Flow
As with all PURE Humidifier Co. humidifiers, a complete line of pneumatic, electric modulating, and electric on/off controlled valves are available (electric modulating and on/off valve actuators are not available for explosive environments).
C
A Dia.
B Tube Diameter
Separator Table 12 Dimensions & Unit Weights 3/4”—NPT Condensate Connection D
Dim. “A”
Table 11 Area Type Humidifier Steam Capacity in pounds per hour (lbs/hr) Model Number
Valve Cv (Size-NPT)
A50
A60
Steam Pressure to Humidifier Supply Connection in psig 2
3
4
5
6
7
8
9
10
11
12
13
14
15
.10 (1/2”) .22 (1/2”) .40 (1/2”) .75 (1/2”) .95 (1/2”) 1.30 (1/2”) 1.75 (1/2”) 2.20 (1/2”) 2.80 (1/2”) 3.25 (1/2”) 4.40 (1/2”)
1.6 3.5 6.4 12 15 21 28 35 45 52 70
1.9 4.5 7.6 14 18 24 33 41 53 61 83
2.3 5.0 9.1 17 21 29 40 50 64 73 98
2.6 5.6 10 19 24 33 44 55 70 82 110
2.8 6.5 11 21 27 36 49 61 78 90 121
3.0 6.6 12 23 29 39 52 66 84 96 130
3.2 7.1 13 24 31 42 56 71 90 104 141
3.4 7.6 14 26 33 44 60 75 96 110 149
3.6 8 15 27 34 47 63 79 100 116 157
3.8 8 15 28 36 49 66 82 104 121 163
4.0 9 16 30 38 51 69 86 109 127 172
4.2 9 16 31 39 53 72 90 114 132 178
4.3 10 17 32 40 55 74 93 118 137 185
4.4 10 18 33 42 57 76 95 121 140 190
5.50 (3/4”)
85
104
123
138
150
161
176
186
196
204
213
222
231
236
Metric Conversion lbs/hr x .4536 = kg/hr
Model Number
Dimensions in inches (cm)
1 psig x 6.895 = kpa
A50
A60
4.5” (11.4)
5.5” (14.0)
Dim. “B”
2.0” (5.1)
2.0” (5.1)
Dim. “C”
22.7” (57.6)
24.2” (61.5)
Dim. “D”
24.1” (61.2)
25.1 (63.8)
Strainer Size
3/4”-NPT
3/4”-NPT
Steam Inlet
3/4”-NPT
3/4”-NPT
Weight in pounds (kg) ∆∆
Model Number A50
A60
18.5 (8.4)
21.5 (9.8)
∆∆ The weights shown include: the separator, injection tube, valve, pneumatic actuator, strainer, and F & T trap.
Piping Notes: 1.
A steam trap and strainer (not shown in the above illustration) are provided with each Area Type steam injection humidifier.
2.
On installation, allow 3 to 4 feet (7.6 to 10.2 cm) above the humidifier to prevent the rising steam from condensing on the ceiling.
3.
When piping, take steam supply from the top of the steam main. The steam trap should drain to a return line with no back pressure; a check valve should be utilized.
Sheet No.
SI-9
System 1 In this simple heating/ventilating system, the desired location of the humidifier is downstream from the fan. The use of a highlimit duct humidistat is recommended if operating conditions are such that saturation could be reached in the duct. The high-limit humidistat should be 12 to 14 feet (365-427 cm) downstream from the humidifier injection tube. A space humidistat controls the humidifier.
H
System 2 This is a 100% outside air system with preheat and reheat coils. The desired location of the primary humidifier is downstream from the reheat coil where air temperature is highest. Where operating conditions vary considerably from design, two humidifiers may be used; control is sequenced from a single space or exhaust air duct humidistat. The first humidifier will deliver one-third of the total capacity. The second humidifier is sized for two-thirds of the total capacity. When control is sequenced in this manner, much closer control is achieved.
When outdoor air conditions are milder, the first humidifier will satisfy the space conditions by supplying a portion of the total design capacity. As the outside air becomes colder and humidity demand increases, the second unit begins to open in response to the additional demand. When the humidifiers are sequenced as described, much closer control is achieved over a wide range of outside air conditions and super saturation of the duct at minimum humidification load is avoided. Use of a high-limit controller is desirable.
H
Sheet No.
SI-10
System 3 Shown here is a 100% outside air system using a primary and secondary humidifier. In this system, the primary humidifier is controlled by a duct humidistat 12 to 14 feet (366-427 cm) downstream from the humidifier and at a level that maintains a space condition of about 35% R.H. at 70°F. The secondary humidifier is controlled by a space humidistat. The secondary unit can be sized to boost space R.H. from 35% R.H. to a higher level such as 55% R.H. Combining humidifiers in this manner allows humidity for each zone to be controlled at a level higher than would otherwise be possible.
H
System 4
H
C
O O LI N G
G IN
System 5 is a simple face and bypass unit. The humidifier is located downstream from the damper section so moisture enters the air stream in the area where best mixing and air temperature conditions exist.
T EA
System 5
H
This is a high velocity, dual duct system. In this system, best results are achieved with primary and booster humidification. The primary humidifier is located as far upstream as possible from the fan and is controlled by a duct humidistat located ahead of the hot and cold deck coils. The booster humidifier is located downstream from the mixing box and is controlled by a humidistat in the space. The primary humidifier should be located no closer than 3 feet (91 cm) from the fan and the booster humidifier no closer than 3 feet (91 cm) from the grill. In both cases, the use of multiple injection tube units should be considered.
MIXING BOX
Sheet No.
SI-11
Single Tube Humidifiers 1. The humidifier shall be capable of removing condensate from the steam by means of a stainless steel condensate/ steam separator, for the purpose of providing condensate-free steam. 2. Steam shall be injected into the air system through a round, stainless steel, steam jacketed injection tube. The tube shall be steam jacketed at supply pressure to assure condensate-free vapor. The steam emission ports shall be precision punched and shall be of sufficient size and number to provide constant and uniform distribution of the steam over the entire width of the duct. 3. The injection tube(s) shall be insulated (optional); insulation of the injection tube shall be done with ½” fiberglass insulation material, surrounded with 24 gauge stainless steel. 4. A normally closed control valve shall have equal percentage flow characteristics, shall close off against the steam, and shall be of sufficient capacity as required. The valve operator, pneumatic modulating (standard) or electric modulating (optional) shall be supplied by PURE Humidifier Co.. 5. The humidifier shall be supplied with a float and thermostatic condensate trap, pipe line strainer, and duct plate (to seal completely at duct opening). 6. The humidifier shall be a PURE Humidifier Co. humidifier as manufactured by PURE Humidifier Co., Chaska, Minnesota. Multiple Tube Humidifiers 1. The humidifier shall be capable of removing condensate from the steam by means of a stainless steel condensate/ steam separator, for the purpose of providing condensate-free steam. 2. Steam shall be injected into the air system through a round, stainless steel, steam jacketed injection tube. The tube shall be steam jacketed at supply pressure to assure condensate-free vapor. The steam emission ports shall be precision punched and shall be of sufficient size and number to provide constant and uniform distribution of the steam over the entire width of the duct. 3. The injection tube(s) shall be insulated (optional); insulation of the injection tube shall be done with ½” fiberglass insulation material, surrounded with 24 gauge stainless steel. 4. A normally closed control valve shall have equal percentage flow characteristics, shall close off against the steam and shall be of sufficient capacity as required. The valve operator, pneumatic modulating (standard) or electric modulating (optional) shall be supplied by PURE Humidifier Co.. 5. The humidifier shall be supplied with float and thermostatic condensate traps, pipe line strainer, and duct plate (to seal completely at duct opening). 6. The humidifier shall be a PURE Humidifier Co. humidifier as manufactured by PURE Humidifier Co., Chaska, Minnesota.
Mini-Mult Humidifiers 1. The humidifier shall be capable of removing condensate from the steam by means of a stainless steel condensate/ steam separator, for the purpose of providing condensate-free steam. 2. Steam shall be injected into the air system through a round, stainless steel, steam jacketed injection tube. The tube shall be steam jacketed at supply pressure to assure condensate-free vapor. The steam emission ports shall be precision punched and shall be of sufficient size and number to provide constant and uniform distribution of the steam over the entire width of the duct without the use of inserts. 3. The injection tubes shall be completely factory welded to a stainless steel “tube manifold” and the tube assembly shall be piped to the separator assembly; ready for installation and piping connections. 4. The injection tube(s) shall be insulated (optional); insulation of the injection tube shall be done with ½” fiberglass insulation material, surrounded with 24 gauge stainless steel. 5. A normally closed control valve shall have equal percentage flow characteristics, shall close off against the steam, and shall be of sufficient capacity as required. The valve operator, pneumatic modulating (standard) or electric modulating (optional) shall be supplied by PURE Humidifier Co.. 6. The humidifier shall be supplied with two float and thermostatic condensate traps (shipped loose), pipe line strainer (shipped loose), and duct plate (to seal completely at duct opening). 7. The humidifier shall be a PURE Humidifier Co. humidifier as manufactured by PURE Humidifier Co., Chaska, Minnesota. Area Type Humidifiers 1. The humidifier shall be capable of removing condensate from the steam by means of a stainless steel condensate/ steam separator, for the purpose of providing condensate free steam. 2. Steam shall be injected into the air system through a round, stainless steel, steam jacketed injection tube. The tube shall be steam jacketed at supply pressure to assure condensate-free vapor. 3. A normally closed control valve shall have equal percentage flow characteristics, shall close off against the steam, and shall be of sufficient capacity as required. The valve operator (pneumatic modulating standard) or electric modulating (optional) shall be supplied by PURE Humidifier Co.. 4. The humidifier shall be supplied with a float and thermostatic condensate trap, pipe line strainer, and duct plate (to seal completely at duct opening). 5. An electrical fan (pneumatic fan optional) shall be provided to add auxiliary air movement to the emitted steam. 6. The humidifier shall be a PURE Humidifier Co. humidifier as manufactured by PURE Humidifier Co., Chaska, Minnesota.
Sheet No.
SI-12
Condensate Return Line In order for the steam trap to remove condensate, it is essential that pressure in the condensate return line be substantially below the steam’s supply pressure. In the event the return line is at a higher elevation than the steam trap, the trap should be drained to a floor drain or the condensate must be elevated. In elevating condensate, an intermittent discharge trap, such as an inverted bucket type, should be used. Every 2 psi (13.8 kpa) of steam pressure will elevate the condensate one foot (30.5 cm). Also, a check valve must be installed on the outlet of the steam trap to prevent back flow of the elevated condensate into the humidifier.
Expanded Duct Section To avoid restricting air flow in a duct 8 inches (20.3cm) or less in height, use of an expanded duct section is recommended.
Proper Length Injection Tubes For best dissipation of the steam into the air stream, always use injection tubes that fully span the widest dimension of the duct.
Vertical Tube Humidifiers In those installations where the duct is taller than it is wide, a vertical tube humidifier may be used to gain tube length. NOTE: Vertical tube humidifiers must always be installed with the tube(s) pointing upwards to avoid trapping condensate in the outboard end of the injection tube.
Insulated Injection Tubes Where specifications require, insulated injection tubes are available. The insulation is 1/2” (1.3 cm) fiberglass covered with a 24 gauge stainless steel jacket. NOTE: Insulated injection tubes must be installed with the stream emitting with the air flow to prevent condensation on the outer insulation jacket.
Fan Interlock Switch PURE Humidifier Co. recommends the use of an air flow proving switch or fan interlock to prove air flow prior to humidifier operation. Humidifier operation without air flow will result in over-saturation of the air stream. Air flow proving switches are available as optional equipment from your PURE Humidifier Co. representative.
High-Limit Humidistat PURE Humidifier Co. recommends the use of a duct high-limit humidistat to prevent humidifier operation when the duct humidity level exceeds 85% relative humidity. Humidifier operation above 85% relative humidity can result in over saturation of the air stream. High-limit humidistats are available as optional equipment from your PURE Humidifier Co. representative.
Temperature Interlock Switch PURE Humidifier Co. recommends the use of an Interlock temperature switch on applications with steam pressures below 5 psi (34.5 kpa) or as a safety switch to prevent humidifier operation in the case of a boiler or trap malfunction. Interlock temperature switches (pneumatic or electric) are available as optional equipment from your PURE Humidifier Co. representative.
Location of Humidifiers Humidifiers should be located: 1. In the center of duct or air handling unit. 2. Not less than 3 feet (91.4 cm) upstream from fan inlets, tees, “ells”, turning vanes, discharge grills or other in-duct objects. 3. Not less than 10 feet (304.8 cm) upstream from high efficiency filters. 4. Not less than 10 feet (304.8 cm) upstream from humidity or temperature controllers.
SI-1
Steam Injection Humidifiers PURE Humidifier Co. Steam Injection Humidifiers are “job-engineered” to assure highly efficient steam release into the air stream. Each humidifier is designed for your specific capacity, steam pressure, and duct size requirements. Single and multiple injection tube units are available to meet the most demanding applications.
Our unique round injection tube requires 80% less welding than rectangular designs and provides 100% steam jacketing of the inner tube. This design creates a stronger and more aerodynamic tube with less metal fatigue and improved air-to-steam characteristics. The increased steam jacketing area provides a hotter tube which delivers PURE steam free of condensate.
High quality control valves and actuators assure accurate response and metering of steam flow. If you prefer to use your own valves and actuators, we will factory mount them for you. Or, if you have a preference for certain valve/actuator combinations, we can usually supply them with the humidifier. Just another way we “job-engineer” the humidifiers to meet your needs.
All PURE Humidifier Co. Steam Injection Humidifiers are equipped with our patented centrifugal steam separator (patent no. 4,509,965). This light weight stainless steel separator completely removes all condensate from the humidification system and provides instantaneous warm-up.
Only high quality corrosion resistant stainless steel is used in the construction of the separator and injection tube. Steam jacketing around the inner tubes means any condensate is “flashed off”. Only PURE steam is delivered, free of water or particulate matter.
A variety of piping options gives you the flexibility of installing the PURE Humidifier Co. Steam Injection Humidifier in confined spaces. The versatility of our steam injection humidifier will allow you to design them into any system simply, efficiently, and reliably.
Separator Injection Tube Steam Control Valve and Actuator
Our results are comforting
Sheet No.
SI-2
All PURE Humidifier Co. Steam Injection Humidifiers are designed with a steam jacketed injection tube(s) and a patented centrifugal steam separator (patent no. 4,509,965). Used in combination with each other, these components ensure the delivery of condensate free, PURE steam, into the air stream. Single Tube, Multiple Tube, Mini-Mult, and Area Type humidifiers all operate with the same basic design. However, the steam path is slightly different in the Single Tube and Area Type humidifiers versus the Multiple Tube and Mini-Mult humidifier.
Figure C
Centrifugal Baffle
Outlet
Inlet/Outlet Baffle
Inlet “C” Condensate Connection
Figure A—Single Tube Strainer
“A”
In the Single Tube and Area Type humidifiers, the steam enters the humidifier through the strainer and travels into the injection tube outer jacket at connection “A” (reference Fig. A). The steam then continues to circulate around the outer jacket of the injection tube and leaves the tube jacket at outlet “B”. The steam then travels through the interconnecting piping to the inlet of the steam separator (connection “C”).
Valve
“B”
Injection Tube
Separator
PURE Steam
Trap
Steam/Condensate
Figure B—Multiple Tube
Inside the separator, the combination of steam and condensate is directed into a circular flow by the internal baffle (reference Fig. C). The condensate, being heavier than the steam, is forced to the outside wall by the centrifugal force created within the separator and is removed from the system by a steam trap. The PURE steam, free of condensate, then rises past the inlet/outlet baffle and flows out of the separator to the control valve (reference Fig. C). On a call for humidity the control valve opens and allows the proper quantity of PURE steam to flow into the jacketed inner tube and thus be emitted out of the injection tube into the air stream (reference Fig. A).
Strainer “A” Valve
Injection Tubes
“B” “A”
“C”
“B” Trap Trap
Separator
In the case of Multiple Tube and Mini-Mult humidifiers, the only variation is that, after the strainer, the steam supply is piped directly to the inlet of the separator (reference Fig. B). An auxiliary steam supply is piped to the first injection tube to provide the steam jacketing. The auxiliary steam supply circulates around the injection tubes and is independently trapped (reference Fig. B). The injection tubes are piped and trapped separately to ensure that the additional resistance created by the extra piping does not reduce the steam supply to the humidifier. This also provides extra trap capacity to handle the additional condensate created within the multiple injection tube steam jackets.
Sheet No.
SI-3
Single Tube Humidifier Selection Single injection tube humidifiers from PURE Humidifier Co. are factory piped and assembled (after piping at the factory, units over four feet (10.2 cm) in length are disassembled at the unions for ease of shipping).
Example
Total humidification load = 76lbs/hr @ 10 psig Number of injection tubes required = 1 Duct width = 5 ft (12.7 cm); Pneumatic valve required
From Table 1 you will see that a Model 50-10 is required. Adding the proper prefix and suffix;
To properly select a single tube humidifier: 1. Select the correct model from Table 1 by referencing the steam supply pressure and humidification load required in lbs/hr. 2. Add the required valve actuator prefix and injection tube insertion length suffix to the model number (reference “Model Nomenclature”)
The correct model number would be: P50-10-5’-1
Fig. D—Single Tube Humidifier Steam Supply Connection
Duct Example:
Mounting Bracket †
P50 - 10 - 2’ - 1
Strainer †
Quantity of Injection Tubes Tube Length (in feet) Tube Model Number Separator Model Number Type of Valve Control; P = Pneumatic M = Electric Modulating E = Electric On-Off
Separator †
Injection Tube †
NOTES: 1. All dashed line piping is by others. 2. † = PURE Humidifier Co.. 3. Reference page SI-4 for Single Tube model dimensions and weights.
Steam Trap †
Steam Emission Ports Steam Control Valve and Actuator † 3/4”-NPT Condensate Connection
Table 1 Single Injection Tube Humidifier Stream Capacity in pounds per hour (lbs/hr) Model Number
50-10
60-20
70-20
80-30
Steam Pressure to Humidifier Supply Connection in psig
Valve Cv (Size-NPT)
2
3
4
5
6
7
8
9
10
11
12
13
14
15
20
25
30
35
40
45
50
55
60
.10 (1/2”)
1.6
1.9
2.3
2.6
2.8
3.0
3.2
3.4
3.6
3.8
4.0
4.2
4.3
4.4
5.1
5.7
6.3
6.8
7.3
7.7
8.1
8.5
8.9
.22 (1/2”)
3.5
4.2
5.0
5.6
6.5
6.6
7.1
7.6
8
8
9
9
10
10
11
13
14
15
16
17
18
19
20
.40 (1/2”)
6.4
7.6
9.1
10
11
12
13
14
15
15
16
16
17
18
20
23
25
27
29
31
33
34
36
.75 (1/2”)
12
14
17
19
21
23
24
26
27
28
30
31
32
33
38
43
47
50
54
57
60
63
66
.95 (1/2”)
15
18
21
24
27
29
31
33
34
36
38
39
40
42
48
54
59
64
68
72
76
80
84
1.30 (1/2”)
21
24
29
33
36
39
42
44
47
49
51
53
55
57
66
74
80
87
93
99
104
109
114
1.75 (1/2”)
28
33
40
44
49
52
56
60
63
66
69
72
74
76
88
99
107
116
124
132
139
146
153
2.20 (1/2”)
35
41
50
55
61
66
71
75
79
82
86
90
93
95
111
123
134
146
156
165
174
183
192
2.80 (1/2”)
45
53
64
70
78
84
90
96
100
104
109
114
118
121
141
157
171
186
199
210
221
233
244
3.25 (1/2”)
52
61
73
82
90
96
104
110
116
121
127
132
137
140
163
181
198
214
229
244
257
270
282
4.40 (1/2”)
70
83
98
110
121
130
141
149
157
163
172
178
185
190
221
244
266
290
310
328
345
363
381
5.50 (3/4”)
85
104
123
138
150
161
176
186
196
204
213
222
231
236
275
305
333
360
385
408
430
451
471
6.20 (3/4”)
96
117
138
155
169
182
198
210
220
230
240
250
259
265
310
343
372
403
434
459
485
508
529
7.50 (3/4”)
116
142
166
186
204
220
238
253
265
277
289
302
312
320
373
412
450
487
525
555
585
614
640
8.20 (1”)
123
155
180
204
223
240
261
275
290
303
313
328
341
349
407
443
488
529
570
603
635
668
703
10.0 (1”)
150
189
220
248
272
293
317
335
354
370
380
400
414
423
497
540
595
645
695
735
770
810
850
12.0 (1”)
180
228
264
296
326
351
378
402
422
441
456
465
492
505
595
648
714
774
828
876
∆
∆
∆
20.0 (1-1/4”)
300
375
440
494
540
582
630
666
702
736
750
772
814
834
990
1060
1180
1280
1376
1460
∆
∆
∆
28.0 (1-1/2”)
420
511
612
686
756
812
873
927
980
1024
1044
1075
1128
1165
1383
1484
1638
1778
1912
2044
∆
∆
∆
Metric Conversion: lbs/hr x .4536 = kg/hr 1 psig x 6.895 = Kpa ∆ Special valve/actuator required; consult factory
Sheet No.
SI-4
Table 2 Single Injection Tube Humidifier Dimensions in inches (cm) Model Number
Dim “A”
Dim “B”
Dim “C”
50-10
4.5” (11.4)
1.5” (3.8)
3.0” (7.6)
12.0” (30.5)
8.5” (21.6)
13.25” (33.7)
1/2”-NPT
1/2”-NPT
60-20
5.5” (14.0)
2.0” (5.1)
3.5” (8.9)
14.375” (36.5)
9.25” (23.5)
14.75” (37.5)
3/4”-NPT
3/4”-NPT
70-20
6.5” (16.5)
2.0” (5.1)
3.5” (8.9)
16.375” (41.6)
10.25” (26.0)
16.25” (41.3)
3/4”-NPT
3/4”-NPT
80-30
7.5” (19.1)
3.0” (7.6)
4.75” (12.1)
19.0” (48.3)
11.75” (29.9)
21.5” (54.6)
1-1/4”-NPT
1-1/4”-NPT
Dim “D”†
Dim “E”
Dim “F”†
Strainer Size
Dim “G”
† Valve manufacturer, Cv, and actuator type will affect this dimension. The dimensions shown are based on an Invensys valve and pneumatic actuator.
Figure F Single Tube Dimensions
1.75” (4.5)
G Steam Supply
L Tube Insertion
Connection
Length
Figure E End View of Tube
C
F
A Dia.
B Tube Diameter E 2” (5.1) Minimum
B
3/4”—NPT Condensate Trap Connection
Mounting Configurations & Steam Emission Direction
D
Table 3 Insertion Lengths & Unit Weights
Air Flow
Figure 1
Figure 2
Horizontal Air Flow
Vertical Air Flow
Sep.
Left Hand Steam Emission
Air Flow
Sep.
Right Hand Steam Emission
Figure G— Plan View (Horizontal Duct)
Steam Emission Direction Steam emission should be into the air flow, except when an optional insulated injection tube is utilized (in which case the steam should emit with the air flow).
Dim “L”†† Insertion Length
Unit Weight by Model Number in pounds (kg) ∆∆
in inches (cm)
50-10
60-20
70-20
80-30
6” (15.2)
18.5 (8.4)
∆
∆
∆
12” (30.5)
19.0 (8.6)
21.5 (9.8)
25.0 (11.4)
∆
18” (45.7)
19.5 (8.9)
22.0 (10.0)
25.5 (11.6)
∆
24” (61.0)
20.0 (9.1)
22.5 (10.2)
26.0 (11.8)
∆
30” (76.2)
20.5 (9.3)
23.0 (10.4)
26.5 (12.0)
∆
36” (91.4)
21 (9.5)
23.5 (10.7)
27 (12.3)
43.5 (19.7)
48” (121.9)
22 (10.0)
24.5 (11.1)
28 (12.7)
45.0 (20.4)
60” (152.4)
23 (10.4)
25.5 (11.6)
29 (13.2)
46.5 (21.1)
72” (182.9)
24 (10.9)
26.5 (12.0)
30 (13.6)
48.0 (21.8)
84” (213.4)
25 (11.4)
27.5 (12.5)
31 (14.1)
49.5 (22.5)
96” (243.8)
26 (11.8)
28.5 (12.9)
32 (14.5)
51.0 (23.2)
On vertical air flow applications, the steam should emit upward, regardless of the air flow direction.
108” (274.3)
27 (12.3)
29.5 (13.4)
33 (15.0)
52.5 (23.8)
120” (304.8)
28 (12.7)
30.5 (13.9)
34 (15.4)
54.0 (24.5)
132” (335.3)
29 (13.2)
31.5 (14.3)
35 (15.9)
55.5 (25.2)
144” (365.8)
30 (13.6)
32.5 (14.8)
36 (16.3)
57.0 (25.9)
Tube piping direction (right or left hand emission) can be determined by referencing the Plan View (Horizontal Duct) drawing (Fig. G).
156” (396.2)
∆
33.5 (15.2)
37 (16.8)
58.5 (26.6)
168” (426.7)
∆
34.5 (15.7)
38 (17.3)
60.0 (27.2)
††
Standard insertion lengths. Special tube lengths are available; consult the factory for details. ∆ Indicates a special order item; consult factory for details. ∆∆ The weights shown include the separator, injection tube, valve, pneumatic actuator, strainer, and F & T trap.
Sheet No.
SI-5
Multiple Tube Humidifier Selection
Recommended Quantity of Injection Tubes
Multiple injection tube humidifiers from PURE Humidifier Co. include all the features of the single tube units. However, the separator/valve assembly and injection tubes are ordered separately to match the correct capacity for both the separator/valve assembly and the injection tubes.
When steam is emitted from the injection tube, it immediately condenses into tiny water droplets. As the steam (fog) travels downstream, the air slowly absorbs the condensed steam until all the water droplets have changed state back to a gas; this distance is called dissipation distance.
To properly select a multiple tube humidifier: 1. Select the correct separator/valve assembly from Table 4 by referencing the steam supply pressure and humidification load required in lbs/hr. 2. Select the proper injection tube model from Table 5 by referencing the steam supply pressure and humidification load required per injection tube (total load ÷ qty. of tubes desired). Reference the “Recommended Quantity of Injection Tubes” section on this page to assist in determining the quantity of injection tubes required.
In many installations a single injection tube will provide the dissipation distance required. However, there are applications where the conditions necessitate the use of multiple injection tubes to achieve a shorter dissipation distance.
Example
To prevent condensation on in-duct objects, such as dampers, coils, filters, or turning vanes, it is very important that the dissipation distance be shorter than the distance from the humidifier to the in-duct object. The following recommendations should be used when designing a multiple injection tube system:
Total humidification load = 383 lbs/hr @ 10 psig Number of injection tubes required = 2 Injection tube humidification capacity = 191.5 Duct width = 60” (5’); Pneumatic valve required.
Recommended Qty. of Tubes † Duct Height Up to 36” …………………………………. 2 37” - 48” …………………………………. 3 49” - 72” …………………………………. 4 73” - 96” …………………………………. 5 Above 96” …………………………………. 6
From Table 4 you will see that a Model 70 Separator/Valve assembly is required. From Table 5 you will see that a model 10 injection tube, at 10 psig can emit the required tube humidification load. The correct model number would be:
† Final duct relative humidity air velocity and available dissipation distance will affect the quantity of tubes required.
P70-10-5’-2
Table 4 Multiple Tube Humidifier Separator / Valve Steam Capacity in pounds per hour (lbs/hr) Model Number
50
60
70
80 90
Steam Pressure to Humidifier Supply Connection in psig
Valve Cv (Size-NPT)
2
3
4
5
6
7
8
9
10
11
12
13
14
15
20
25
30
35
40
45
50
55
60
.10 (1/2”)
1.6
1.9
2.3
2.6
2.8
3.0
3.2
3.4
3.6
3.8
4.0
4.2
4.3
4.4
5.1
5.7
6.3
6.8
7.3
7.7
8.1
8.5
8.9
.22 (1/2”)
3.5
4.2
5.0
5.6
6.5
6.6
7.1
7.6
8
8
9
9
10
10
11
13
14
15
16
17
18
19
20
.40 (1/2”)
6.4
7.6
9.1
10
11
12
13
14
15
15
16
16
17
18
20
23
25
27
29
31
33
34
36
.75 (1/2”)
12
14
17
19
21
23
24
26
27
28
30
31
32
33
38
43
47
50
54
57
60
63
66
.95 (1/2”)
15
18
21
24
27
29
31
33
34
36
38
39
40
42
48
54
59
64
68
72
76
80
84
1.30 (1/2”)
21
24
29
33
36
39
42
44
47
49
51
53
55
57
66
74
80
87
93
99
104
109
114
1.75 (1/2”)
28
33
40
44
49
52
56
60
63
66
69
72
74
76
88
99
107
116
124
132
139
146
153
2.20 (1/2”)
35
41
50
55
61
66
71
75
79
82
86
90
93
95
111
123
134
146
156
165
174
183
192
2.80 (1/2”)
45
53
64
70
78
84
90
96
100
104
109
114
118
121
141
157
171
186
199
210
221
233
244
3.25 (1/2”)
52
61
73
82
90
96
104
110
116
121
127
132
137
140
163
181
198
214
229
244
257
270
282
4.40 (1/2”)
70
83
98
110
121
130
141
149
157
163
172
178
185
190
221
244
266
290
310
328
345
363
381
5.50 (3/4”)
85
104
123
138
150
161
176
186
196
204
213
222
231
236
275
305
333
360
385
408
430
451
471
6.20 (3/4”)
96
117
138
155
169
182
198
210
220
230
240
250
259
265
310
343
372
403
434
459
485
508
529
7.50 (3/4”)
116
142
166
186
204
220
238
253
265
277
289
302
312
320
373
412
450
487
525
555
585
614
640
8.20 (1”)
123
155
180
204
223
240
261
275
290
303
313
328
341
349
407
443
488
529
570
603
635
668
703
10.0 (1”)
150
189
220
248
272
293
317
335
354
370
380
400
414
423
497
540
595
645
695
735
770
810
850
12.0 (1”)
180
228
264
296
326
351
378
402
422
441
456
465
492
505
595
648
714
774
828
876
∆
∆
∆
20.0 (1-1/4”)
300
375
440
494
540
582
630
666
702
736
750
772
814
834
990
1060
1180
1280
1376
1460
∆
∆
∆
28.0 (1-1/2”)
420
511
612
686
756
812
873
927
980
1024
1044
1075
1128
1165
1383
1484
1638
1778
1912
2044
∆
∆
∆
40.0 (2”)
600
720
872
980
1080
1112
1240
1316
1392
1456
1480
1528
1592
1656
1964
2080
2320
2520
2720
2904
∆
∆
∆
35
40
45
50
55
Table 5 Injection Tube Steam Capacity per tube in pounds per hour (lbs/hr) Model Number
Steam Pressure to Humidifier Supply Connection in psig 2
3
4
5
6
7
8
9
10
11
12
13
14
15
20
25
30
60
10
95
115
134
153
167
181
195
209
225
238
251
263
276
289
302
315
328
341
354
367
380
393
406
20
184
222
266
309
340
371
402
433
463
491
519
546
574
602
630
658
686
714
742
770
798
826
854
30
333
416
489
575
661
681
734
787
840
893
946
999
1052
1105
1158
1211
1264
1317
1370
1423
1476
1529
1582
Metric Conversion: lbs/hr x .4536 = kg/hr 1 psig x 6.895 = Kpa ∆ Special valve/actuator required; consult factory
Sheet No.
SI-6
Table 6 Separator/Valve Assembly Dimensions & Weights (Ref. Fig. I) Model Number
Dim “A”
Dim “B”†
Dim “C”†
Dim “D”
Dim “E”
Dim “F”
50
4.5” (11.4)
13.25” (33.7)
8.75” (22.2)
5.50” (14.0)
1/2”-NPT
60
5.5” (14.0)
4.75” (37.5)
10.75” (27.3)
5.75” (14.6)
70
6.5” (16.5)
16.25” (41.3)
12.75” (32.4)
6.50” (16.5)
80
7.5” (19.1)
21.5” (54.6)
15.50” (39.4)
90
8.5” (21.6)
23.25” (59.0)
16.50” (41.9)
Weight
Strainer Size
in lbs (kg)
1/2”-NPT
1/2”-NPT
30 (13.7)
3/4”-NPT
3/4”-NPT
3/4”-NPT
32 (14.6)
1”-NPT
1”-NPT
1”-NPT
36 (16.4)
7.25” (18.4)
1-1/2”-NPT
1-1/2”-NPT
1-1/2”-NPT
50 (22.8)
7.50” (19.1)
2”-NPT
2”-NPT
2”-NPT
59 (26.9)
† Valve manufacturer, Cv and actuator type will affect this dimension. The dimensions are shown based on an Invensys valve and pneumatic actuator. The weights shown include: separator, valve, valve actuator, strainer, and two steam traps.
Fig. H—Injection Tube
Fig. I—Separator/Valve Assembly 1.75” (4.5)
K Tube Insertion
3/8-16 UNC Tube Support
E
Length
(NPT)
J (NPT)
A Dia.
D
B
I H Tube Diameter
H
2” (5.1) Minimum
F (NPT)
End View of Injection Tube
G
3/4”—NPT Condensate Trap
C
Table 7 Injection Tube Dimensions (Ref. Fig. H) Model Number
Dim “G”
Dim “H”
Dim “I”
Dim “J”
10
4.50” (11.4)
1.5” (3.8)
3.00” (7.6)
1/2”-NPT
20
4.75” (12.1)
2.0” (5.1)
3.50” (8.9)
3/4”-NPT
30
5.50” (14.0)
3.0” (7.6)
4.75” (12.1)
1-1/4”-NPT
Table 8 Insertion Lengths & Unit Weights Dim “K”†† Insertion Length
Unit Weight by Model Number in pounds (kg) ∆
in inches (cm)
10
20
30
6” (15.2)
.5 (.23)
∆
∆
12” (30.5)
1.0 (.45)
1.5 (.68)
∆
18” (45.7)
1.5 (.68)
2.0 (.391)
∆
24” (61.0)
2.0 (.91)
2.5 (1.1)
∆
30” (76.2)
2.5 (1.1)
3.0 (1.4)
∆
36” (91.4)
3.0 (1.4)
3.5 (1.6)
6.0 (2.7)
48” (121.9)
4.0 (1.8)
4.5 (2.0)
7.5 (3.4)
60” (152.4)
5.0 (2.3)
5.5 (2.5)
9.0 (4.1)
72” (182.9)
6.0 (2.7)
6.5 (3.0)
10.5 (4.8)
84” (213.4)
7.0 (3.2)
7.5 (3.4)
12 (5.5)
96” (243.8)
8.0 (3.6)
8.5 (3.9)
13.5 (6.1)
108” (274.3)
9.0 (4.1)
9.5 (4.3)
15.0 (6.8)
120” (304.8)
10 (4.5)
10.5 (4.8)
16.5 (7.5)
132” (335.3)
11 (5.0)
11.5 (5.2)
18.0 (8.2)
Piping Notes
144” (365.8)
12 (5.5)
12.5 (5.7)
19.5 (8.9)
1. 2. 3.
156” (396.2)
∆
13.5 (6.1)
21.0 (9.5)
168” (426.7)
∆
14.5 (6.6)
22.5 (10.2)
Fig. J — Piping Diagram Injection Tubes (typ.)
Strainer
E
Reference piping notes located in the lower right corner of this page.
J
Steam Supply
J E
J
J E
J
J
J
J Separator/Valve Assembly
3/4”-NPT
Reference Table 6 for pipe size “E” Trap Reference Table 7 for pipe size “K” ALL LINE PIPING IS BY OTHERS. Multiple injection tube humidifiers require field assembly/piping. If factory assembly/piping is required, consult the factory for the optional “Factory Assembled Multiple” (FAM)
3/4”-NPT Trap
†† Standard insertion lengths. Special tube lengths are available; consult the factory for details. ∆ Indicates a special order item; consult factory for details. Reference Fig. H for description of dimension “K”
Sheet No.
SI-7
Mini-Mult Humidifiers The Mini-Mult humidifier from PURE Humidifer Co. includes all of the features of the single tube units. However, the Mini-Mult humidifier is designed for applications that require small humidification loads in a small duct size.
The humidifiers are shipped completely assembled and ready for installation. They fit into a slot cut into the duct wall, and the slot is sealed with a factory duct plate. Specially designed low capacity valve Cv’s assure precise humidity control without over-humidification, valve “hunting”, or saturation. A complete line of pneumatic, electric modulating, and electric on-off controlled valve actuators are available.
They are ideally suited for any high humidity job where fast steam dissipation in cool air, in a short-run duct, is essential. That means hospital delivery rooms, the O.R., the I.C.U., or “clean rooms” in any high tech application.
Fig. K—Mini-Mult Side View
Fig. L—Mini-Mult Front View
11.75” (30.0)
7.75” (19.7)
B Tube Insertion Length
7.5” (19.1)
1/2”—NPT Steam Supply Conn.
(ref. note #2)
1/2”—NPT Steam Supply Conn.
A
4.75” (12.1)
10.50” (26.7) (ref. note #3)
(ref. note #1)
3” (7.6) Typ. Centers
3/4”—NPT Condensate Connection (see Side View)
3/4”—NPT F & T Style Condensate Steam Trap (shipped loose for field mounting); Typ. two per unit.
Fig. M—Injection Tube Optional 1/4” (.64) Insulation
Notes 1. 2. 3. 4. 5.
50-5
Valve Cv (Size-NPT) .10 (1/2”) .22 (1/2”) .40 (1/2”) .75 (1/2”) .95 (1/2”) 1.30 (1/2”) 1.75 (1/2”) 2.20 (1/2”) 2.80 (1/2”) 3.25 (1/2”) 4.40 (1/2”)
Insulated
Table 10 Recommended Qty of Tubes and Unit Weights
Steam Pressure to Humidifier Supply Connection in psig 2
3
4
5
6
7
8
9
10
11
12
13
14
15
1.6 3.5 6.4 12 15 21 28 35 45 52 70
1.9 4.5 7.6 14 18 24 33 41 53 61 83
2.3 5.0 9.1 17 21 29 40 50 64 73 98
2.6 5.6 10 19 24 33 44 55 70 82 110
2.8 6.5 11 21 27 36 49 61 78 90 121
3.0 6.6 12 23 29 39 52 66 84 96 130
3.2 7.1 13 24 31 42 56 71 90 104 141
3.4 7.6 14 26 33 44 60 75 96 110 149
3.6 8 15 27 34 47 63 79 100 116 157
3.8 8 15 28 36 49 66 82 104 121 163
4.0 9 16 30 38 51 69 86 109 127 172
4.2 9 16 31 39 53 72 90 114 132 178
4.3 10 17 32 40 55 74 93 118 137 185
4.4 10 18 33 42 57 76 95 121 140 190
Metric Conversion lbs/hr x .4536 = kg/hr 1 psig x 6.895 = kpa
1.25” (3.2)
Non-Insulated
Table 9 Mini-Mult Humidifier Steam Capacity in pounds per hour (lbs/hr) Model Number
1.5” (3.8)
1” (2.54)
Dim “A” varies between 4” (10.2 cm) for two tubes and 16” (40.6 cm) for six tubes; varies in 3” (7.6 cm) increments. Dim “B” varies between 6” (15.2 cm) and 48” (122.0 cm) in 2” (5.1 cm) increments, depending upon the insertion length. Reference Table 10 for standard insertion lengths. The overall height increases in 3” increments for each additional injection tube. Reference Table 10 for the recommended quantity of injection tubes. All dimensions are in inches (cm); all dimensions are for reference only. Dotted line piping is by others.
Duct Height in inches (cm)
Qty of Tubes
Weight in pounds (kg)∆∆
6-9” (15.2-22.7)
2
29.5 (13.5)
10-12” (25.4-30.5)
3
31.0 (14.1)
13-15” (33.0-38.1)
4
32.5 (14.7)
16-18” (40.6-45.7)
5
34.0 (15.4)
19.-24” (48.3-61.0)
6
35.5 (16.1)
∆∆ The weights shown include: the separator, injection tube, valve, pneumatic actuator, strainer, and two float & thermostatic traps.
Sheet No.
SI-8
Area Type Humidifiers
Fig. N—Area Type Reference piping notes located in the lower right corner of this page.
Area Type tube humidifiers from PURE Humidifier Co. include all the features of the single tube units. However, the Area Type humidifier is designed for applications that require direct humidification without the use of duct work. They are ideally suited for area humidity control in applications such as paper, textile, or wood manufacturing, as well as, printing plants and storage areas.
Electric Fan 115 vac single phase 9 watt / 3 amp.
The standard Area Type humidifier is provided with an electrically operated fan to mix the steam with the surrounding air. If humidity is required in an explosive environment, an optional pneumatically driven fan is available (consult the factory).
Steam Control Valve and Actuator Air Flow
As with all PURE Humidifier Co. humidifiers, a complete line of pneumatic, electric modulating, and electric on/off controlled valves are available (electric modulating and on/off valve actuators are not available for explosive environments).
C
A Dia.
B Tube Diameter
Separator Table 12 Dimensions & Unit Weights 3/4”—NPT Condensate Connection D
Dim. “A”
Table 11 Area Type Humidifier Steam Capacity in pounds per hour (lbs/hr) Model Number
Valve Cv (Size-NPT)
A50
A60
Steam Pressure to Humidifier Supply Connection in psig 2
3
4
5
6
7
8
9
10
11
12
13
14
15
.10 (1/2”) .22 (1/2”) .40 (1/2”) .75 (1/2”) .95 (1/2”) 1.30 (1/2”) 1.75 (1/2”) 2.20 (1/2”) 2.80 (1/2”) 3.25 (1/2”) 4.40 (1/2”)
1.6 3.5 6.4 12 15 21 28 35 45 52 70
1.9 4.5 7.6 14 18 24 33 41 53 61 83
2.3 5.0 9.1 17 21 29 40 50 64 73 98
2.6 5.6 10 19 24 33 44 55 70 82 110
2.8 6.5 11 21 27 36 49 61 78 90 121
3.0 6.6 12 23 29 39 52 66 84 96 130
3.2 7.1 13 24 31 42 56 71 90 104 141
3.4 7.6 14 26 33 44 60 75 96 110 149
3.6 8 15 27 34 47 63 79 100 116 157
3.8 8 15 28 36 49 66 82 104 121 163
4.0 9 16 30 38 51 69 86 109 127 172
4.2 9 16 31 39 53 72 90 114 132 178
4.3 10 17 32 40 55 74 93 118 137 185
4.4 10 18 33 42 57 76 95 121 140 190
5.50 (3/4”)
85
104
123
138
150
161
176
186
196
204
213
222
231
236
Metric Conversion lbs/hr x .4536 = kg/hr
Model Number
Dimensions in inches (cm)
1 psig x 6.895 = kpa
A50
A60
4.5” (11.4)
5.5” (14.0)
Dim. “B”
2.0” (5.1)
2.0” (5.1)
Dim. “C”
22.7” (57.6)
24.2” (61.5)
Dim. “D”
24.1” (61.2)
25.1 (63.8)
Strainer Size
3/4”-NPT
3/4”-NPT
Steam Inlet
3/4”-NPT
3/4”-NPT
Weight in pounds (kg) ∆∆
Model Number A50
A60
18.5 (8.4)
21.5 (9.8)
∆∆ The weights shown include: the separator, injection tube, valve, pneumatic actuator, strainer, and F & T trap.
Piping Notes: 1.
A steam trap and strainer (not shown in the above illustration) are provided with each Area Type steam injection humidifier.
2.
On installation, allow 3 to 4 feet (7.6 to 10.2 cm) above the humidifier to prevent the rising steam from condensing on the ceiling.
3.
When piping, take steam supply from the top of the steam main. The steam trap should drain to a return line with no back pressure; a check valve should be utilized.
Sheet No.
SI-9
System 1 In this simple heating/ventilating system, the desired location of the humidifier is downstream from the fan. The use of a highlimit duct humidistat is recommended if operating conditions are such that saturation could be reached in the duct. The high-limit humidistat should be 12 to 14 feet (365-427 cm) downstream from the humidifier injection tube. A space humidistat controls the humidifier.
H
System 2 This is a 100% outside air system with preheat and reheat coils. The desired location of the primary humidifier is downstream from the reheat coil where air temperature is highest. Where operating conditions vary considerably from design, two humidifiers may be used; control is sequenced from a single space or exhaust air duct humidistat. The first humidifier will deliver one-third of the total capacity. The second humidifier is sized for two-thirds of the total capacity. When control is sequenced in this manner, much closer control is achieved.
When outdoor air conditions are milder, the first humidifier will satisfy the space conditions by supplying a portion of the total design capacity. As the outside air becomes colder and humidity demand increases, the second unit begins to open in response to the additional demand. When the humidifiers are sequenced as described, much closer control is achieved over a wide range of outside air conditions and super saturation of the duct at minimum humidification load is avoided. Use of a high-limit controller is desirable.
H
Sheet No.
SI-10
System 3 Shown here is a 100% outside air system using a primary and secondary humidifier. In this system, the primary humidifier is controlled by a duct humidistat 12 to 14 feet (366-427 cm) downstream from the humidifier and at a level that maintains a space condition of about 35% R.H. at 70°F. The secondary humidifier is controlled by a space humidistat. The secondary unit can be sized to boost space R.H. from 35% R.H. to a higher level such as 55% R.H. Combining humidifiers in this manner allows humidity for each zone to be controlled at a level higher than would otherwise be possible.
H
System 4
H
C
O O LI N G
G IN
System 5 is a simple face and bypass unit. The humidifier is located downstream from the damper section so moisture enters the air stream in the area where best mixing and air temperature conditions exist.
T EA
System 5
H
This is a high velocity, dual duct system. In this system, best results are achieved with primary and booster humidification. The primary humidifier is located as far upstream as possible from the fan and is controlled by a duct humidistat located ahead of the hot and cold deck coils. The booster humidifier is located downstream from the mixing box and is controlled by a humidistat in the space. The primary humidifier should be located no closer than 3 feet (91 cm) from the fan and the booster humidifier no closer than 3 feet (91 cm) from the grill. In both cases, the use of multiple injection tube units should be considered.
MIXING BOX
Sheet No.
SI-11
Single Tube Humidifiers 1. The humidifier shall be capable of removing condensate from the steam by means of a stainless steel condensate/ steam separator, for the purpose of providing condensate-free steam. 2. Steam shall be injected into the air system through a round, stainless steel, steam jacketed injection tube. The tube shall be steam jacketed at supply pressure to assure condensate-free vapor. The steam emission ports shall be precision punched and shall be of sufficient size and number to provide constant and uniform distribution of the steam over the entire width of the duct. 3. The injection tube(s) shall be insulated (optional); insulation of the injection tube shall be done with ½” fiberglass insulation material, surrounded with 24 gauge stainless steel. 4. A normally closed control valve shall have equal percentage flow characteristics, shall close off against the steam, and shall be of sufficient capacity as required. The valve operator, pneumatic modulating (standard) or electric modulating (optional) shall be supplied by PURE Humidifier Co.. 5. The humidifier shall be supplied with a float and thermostatic condensate trap, pipe line strainer, and duct plate (to seal completely at duct opening). 6. The humidifier shall be a PURE Humidifier Co. humidifier as manufactured by PURE Humidifier Co., Chaska, Minnesota. Multiple Tube Humidifiers 1. The humidifier shall be capable of removing condensate from the steam by means of a stainless steel condensate/ steam separator, for the purpose of providing condensate-free steam. 2. Steam shall be injected into the air system through a round, stainless steel, steam jacketed injection tube. The tube shall be steam jacketed at supply pressure to assure condensate-free vapor. The steam emission ports shall be precision punched and shall be of sufficient size and number to provide constant and uniform distribution of the steam over the entire width of the duct. 3. The injection tube(s) shall be insulated (optional); insulation of the injection tube shall be done with ½” fiberglass insulation material, surrounded with 24 gauge stainless steel. 4. A normally closed control valve shall have equal percentage flow characteristics, shall close off against the steam and shall be of sufficient capacity as required. The valve operator, pneumatic modulating (standard) or electric modulating (optional) shall be supplied by PURE Humidifier Co.. 5. The humidifier shall be supplied with float and thermostatic condensate traps, pipe line strainer, and duct plate (to seal completely at duct opening). 6. The humidifier shall be a PURE Humidifier Co. humidifier as manufactured by PURE Humidifier Co., Chaska, Minnesota.
Mini-Mult Humidifiers 1. The humidifier shall be capable of removing condensate from the steam by means of a stainless steel condensate/ steam separator, for the purpose of providing condensate-free steam. 2. Steam shall be injected into the air system through a round, stainless steel, steam jacketed injection tube. The tube shall be steam jacketed at supply pressure to assure condensate-free vapor. The steam emission ports shall be precision punched and shall be of sufficient size and number to provide constant and uniform distribution of the steam over the entire width of the duct without the use of inserts. 3. The injection tubes shall be completely factory welded to a stainless steel “tube manifold” and the tube assembly shall be piped to the separator assembly; ready for installation and piping connections. 4. The injection tube(s) shall be insulated (optional); insulation of the injection tube shall be done with ½” fiberglass insulation material, surrounded with 24 gauge stainless steel. 5. A normally closed control valve shall have equal percentage flow characteristics, shall close off against the steam, and shall be of sufficient capacity as required. The valve operator, pneumatic modulating (standard) or electric modulating (optional) shall be supplied by PURE Humidifier Co.. 6. The humidifier shall be supplied with two float and thermostatic condensate traps (shipped loose), pipe line strainer (shipped loose), and duct plate (to seal completely at duct opening). 7. The humidifier shall be a PURE Humidifier Co. humidifier as manufactured by PURE Humidifier Co., Chaska, Minnesota. Area Type Humidifiers 1. The humidifier shall be capable of removing condensate from the steam by means of a stainless steel condensate/ steam separator, for the purpose of providing condensate free steam. 2. Steam shall be injected into the air system through a round, stainless steel, steam jacketed injection tube. The tube shall be steam jacketed at supply pressure to assure condensate-free vapor. 3. A normally closed control valve shall have equal percentage flow characteristics, shall close off against the steam, and shall be of sufficient capacity as required. The valve operator (pneumatic modulating standard) or electric modulating (optional) shall be supplied by PURE Humidifier Co.. 4. The humidifier shall be supplied with a float and thermostatic condensate trap, pipe line strainer, and duct plate (to seal completely at duct opening). 5. An electrical fan (pneumatic fan optional) shall be provided to add auxiliary air movement to the emitted steam. 6. The humidifier shall be a PURE Humidifier Co. humidifier as manufactured by PURE Humidifier Co., Chaska, Minnesota.
Sheet No.
SI-12
Condensate Return Line In order for the steam trap to remove condensate, it is essential that pressure in the condensate return line be substantially below the steam’s supply pressure. In the event the return line is at a higher elevation than the steam trap, the trap should be drained to a floor drain or the condensate must be elevated. In elevating condensate, an intermittent discharge trap, such as an inverted bucket type, should be used. Every 2 psi (13.8 kpa) of steam pressure will elevate the condensate one foot (30.5 cm). Also, a check valve must be installed on the outlet of the steam trap to prevent back flow of the elevated condensate into the humidifier.
Expanded Duct Section To avoid restricting air flow in a duct 8 inches (20.3cm) or less in height, use of an expanded duct section is recommended.
Proper Length Injection Tubes For best dissipation of the steam into the air stream, always use injection tubes that fully span the widest dimension of the duct.
Vertical Tube Humidifiers In those installations where the duct is taller than it is wide, a vertical tube humidifier may be used to gain tube length. NOTE: Vertical tube humidifiers must always be installed with the tube(s) pointing upwards to avoid trapping condensate in the outboard end of the injection tube.
Insulated Injection Tubes Where specifications require, insulated injection tubes are available. The insulation is 1/2” (1.3 cm) fiberglass covered with a 24 gauge stainless steel jacket. NOTE: Insulated injection tubes must be installed with the stream emitting with the air flow to prevent condensation on the outer insulation jacket.
Fan Interlock Switch PURE Humidifier Co. recommends the use of an air flow proving switch or fan interlock to prove air flow prior to humidifier operation. Humidifier operation without air flow will result in over-saturation of the air stream. Air flow proving switches are available as optional equipment from your PURE Humidifier Co. representative.
High-Limit Humidistat PURE Humidifier Co. recommends the use of a duct high-limit humidistat to prevent humidifier operation when the duct humidity level exceeds 85% relative humidity. Humidifier operation above 85% relative humidity can result in over saturation of the air stream. High-limit humidistats are available as optional equipment from your PURE Humidifier Co. representative.
Temperature Interlock Switch PURE Humidifier Co. recommends the use of an Interlock temperature switch on applications with steam pressures below 5 psi (34.5 kpa) or as a safety switch to prevent humidifier operation in the case of a boiler or trap malfunction. Interlock temperature switches (pneumatic or electric) are available as optional equipment from your PURE Humidifier Co. representative.
Location of Humidifiers Humidifiers should be located: 1. In the center of duct or air handling unit. 2. Not less than 3 feet (91.4 cm) upstream from fan inlets, tees, “ells”, turning vanes, discharge grills or other in-duct objects. 3. Not less than 10 feet (304.8 cm) upstream from high efficiency filters. 4. Not less than 10 feet (304.8 cm) upstream from humidity or temperature controllers.
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