Armstrong FSA-91A Manuale di installazione e funzionamento - Pagina 2
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Humidifi er Piping
Step 3. Run the steam supply line from the steam
header to the humidifi er as indicated in Fig. 2-1. Observe
the following:
A.
Take steam supply line from the top of the supply
main – never from the side or bottom. If several
humidifi ers take steam from a single supply line,
be sure to trap the end of the run-out with an Arm-
strong Trap of suitable size. If the steam supply is
very wet, install a drip pocket or separator ahead
of the humidifi er.
B.
Size supply line in accordance with Table 2-1. If
the steam supply is 5 psi or less, it is advisable to
use one pipe size larger and reduce the pipe size
just ahead of the strainer and humidifi er.
C. Pitch the supply line in the direction of fl ow.
Table 2-1 Recommended Pipe Sizes
Humidifi er
Supply Header
Size
to Strainer
91
3/4"
92
3/4"
93
1-1/4"
Steam Pipe Capacities
For computing ability of piping to deliver an adequate supply of steam to
humidifi er. Capacities shown are in pounds per hour.
Table 2-2 Steam Pipe Capacity at 5 psi
Pressure drop, psi per 100 ft. of pipe length
Pipe
Size in.
1/8
1/4
1
24
31
1-1/4
52
68
1-1/2
81
100
2
160
210
2-1/2
270
350
Table 2-3 Steam Pipe Capacity at 15 psi
Pressure drop, psi per 100 ft. of pipe length
Pipe
Size in.
1/8
1/4
1
27
38
1-1/4
59
83
1-1/2
91
130
2
180
260
2-1/2
300
430
Table 2-4 Steam Pipe Capacity at 25 psi
Pressure drop, psi per 100 ft. of pipe length
Pipe
Size in.
1/8
1/4
3/4
15
21
1
30
43
1-1/4
67
95
1-1/2
100
140
2
210
300
2-1/2
340
490
Steam Inlet
Drip
Trap
& Strainer
Leg
Piping
3/4"
1"
3/4"
3/4"
1"
3/4"
1-1/4"
1-1/4"
3/4"
1/2
3/4
44
54
62
97
120
140
150
180
210
300
370
430
500
610
710
1/2
3/4
1
53
65
76
120
140
160
180
220
260
370
450
520
600
740
860
1210
1/2
3/4
1
30
37
43
61
75
86
122
130
160
190
260
210
250
290
410
420
510
590
840
690
850
980
1380
D. Expansion and Contraction. With average length
of supply line, the dimension change from hot to
cold should not exceed 2". Provide piping with 3
elbows to get swing to take care of expansion and
contraction (See Fig. 2-2).
E.
Clean piping. After running the supply line, blow
down at full steam pressure to eliminate dirt and
pipe cuttings.
F.
A Pipe Strainer is furnished with each humidifi er.
Install (after blowing down supply line) as indi-
cated on drawing.
G. Swivel connections may be desirable – see
Fig. 2-2 and explanatory captions.
H. Pressure Reducing Valve. If required refer to
Fig. 3-1 and explanatory captions.
Table 2-5 Steam Pipe Capacity at 50 psi
Pipe
1/4
Size in.
3/4
27
1
54
1-1/4
120
1-1/2
180
2
370
2-1/2
620
1
Figure 2-1.
Dirt
2
Steam
Pocket
110
Typically pneumatically controlled humidifier installation.
230
360
Figure 2-2.
Pitch down
740
1/2" in 10'
Strainer
2
60
Dirt
Pocket
Steam
Trap
Swivel connections shown above permit direction of discharge
to be altered easily. Loosen both unions, adjust direction, then
retighten unions.
2
Pressure drop, psi per 100 ft. of pipe length
1/2
3/4
1
38
47
54
77
94
110
170
210
240
260
320
370
530
650
750
870
1070
1240
Strainer
Pitch down 1/2" in 10'
To low
Check
pressure return
Valve
Trap
To low
Check
pressure return
Valve
2
5
76
120
150
240
340
530
520
830
1060
1680
1750
2760
Take off top of
steam supply
Take off top of
steam supply