Gas Supply Pipe Sizing and Looping
TMB2126N_SVG
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1. Gas furnace [ 120,000 Btu/hr. [127 Mj/hr., 35 kW] ]
2. Gas water heaters [ 400,000 Btu/hr. [422 Mj/hr., 117 kW] each]
3. Gas space heaters [ 70,000 Btu/hr. [79 Mj/hr., 21 kW] each]
4. Sediment traps, supply pressure taps and shut-off valves. Refer to Figure 1.
5. 1 in. [25 mm] gas pipe loop
6. 19 ft. [5.8 m]
7. Minimum Pipe Size is 1/2 NPT
8. 25 ft. [7.6 m]
9. Main regulator
10. Gas meter
11. Pressure regulator (if required)
12. 025 series tumble dryers = 64,000 Btu/hr. [68 Mj/hr., 19 kW] each; 030 series tumble dryers = 73,000 Btu/hr. [77 Mj/hr., 21
kW] each; 035 series tumble dryers = 90,000 Btu/hr. [95 Mj/hr., 26 kW] each; Stacked 30 series tumble dryers = 73,000 Btu/hr.
[77 Mj/hr., 21 kW] per tumble dryer; 146,000 total Btu/hr. [154 Mj/hr., 43 kW] for machine; Stacked 45 series tumble dryers =
95,000 Btu/hr. [100 Mj/hr., 28 kW] per tumble dryer; 190,000 total Btu/hr. [200 Mj/hr., 56 kW] for machine; 055 series tumble
dryers = 112,000 Btu/hr. [118 Mj/hr., 33 kW] each
Figure 21
SAMPLE CALCULATIONS:
Equivalent length = Total length of main gas supply pipe to
the far end of the tumble dryers.
= 25 ft. + 19 ft. [7.6 m + 5.8 m] gas supply pipe
= 44 ft. [13.4 m] Total Gas Line
Total Btu/hr. = The sum of the Btu/hr. of all 030 series tumble
dryers being fed by the main gas supply pipe.
= 9 x 73,000 [77, 21]
= 657,000 Btu/hr. [193 kW]
Using Table 15 , the main supply pipe diameter should be 2
NPT .
IMPORTANT: Gas loop piping must be installed as il-
lustrated to equalize gas pressure for all tumble dryers
connected to single gas service. Other gas using appli-
ances should be connected upstream from loop.
Gas Requirements
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Published by permission of the copyright owner -
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53 Part No. 70686701ENR4
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