39
GTS HUMIDIFIER LX SERIES INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
• Piping to units should conform with local and national requirements for
type, volume, and gas handled and for pressure drop allowed in the line.
Refer to the tables on this page to determine the gas flow in ft
3
/hr or m
3
/hr
for the type of gas and size of unit to install. Using this value and the length
of pipe necessary, determine the pipe diameter. Where several units are
served by the same main, the total capacity, gas flow, and length of main
must be considered. Avoid pipe sizes smaller than 1/2" (DN15). Table
39-2 allows for the usual number of fittings with a 0.3" wc (0.07 kPa)
pressure drop.
• When the specific gravity of the gas is other than 0.60 for natural gas or
1.53 for propane, use Table 39-1.
Table 39-2:
Gas pipe capacities for gas pressures of 0.5 psig (3.45 kPa) or less
Length of
pipe
Gas flow in piping in ft
3
/hr and m
3
/hr at pressure drop of 0 .3" wc (0 .07 kPa)
Specific gravity = 0 .60
Nominal iron pipe diameter in inches (DN)
1/2" (DN15)
3/4" (DN20)
1" (DN25)
1¼" (DN32)
1½" (DN40)
ft
m
ft
3
/hr m
3
/hr ft
3
/hr m
3
/hr ft
3
/hr m
3
/hr ft
3
/hr m
3
/hr ft
3
/hr m
3
/hr
10
3
132
3.7
278
7.9
520
14.7
1050
29.7
1600
45.3
20
6
92
2.6
190
5.4
350
9.9
730
20.7
1100
31.1
30
9
73
2.1
152
4.3
285
8.1
590
16.7
890
25.2
40
12
63
1.8
130
3.7
245
6.9
500
14.2
760
21.5
50
15
56
1.6
115
3.3
215
6.1
440
12.5
670
19.0
60
18
50
1.4
105
3.0
195
5.5
400
11.3
610
17.3
70
21
46
1.3
96
2.7
180
5.1
370
10.5
560
15.9
80
24
43
1.2
90
2.5
170
4.8
350
9.9
530
15.0
90
27
40
1.1
84
2.4
160
4.5
320
9.1
490
13.9
100
30
38
1.1
79
2.2
150
4.2
305
8.6
460
13.0
Table 39-1:
Specific gravity conversion factors
Natural gas
Specific gravity
Factor
0.55
1.04
0.60
1.00
0.65
0.962
Propane gas
Specific gravity
Factor
1.50
0.633
1.53
0.626
1.60
0.612
Note:
Use the above multiplying factor with Table:
39-2 when the specific gravity of gas
is other than 0.60 (natural gas) or 1.53
(propane).
INSTALLATION
Gas (continued)
Piping:
