Gas Requirements
46
Part No. 70476501ENR7
Gas Supply Pipe Sizing and Looping
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 120 series tumble dryers being fed by the main gas supply pipe.
= 9 x 270,000 (285, 79.13)
= 2,430,000 Btu/hr. (2,564 Mj/hr., 712.17 kW)
Using Gas Pipe Size Required for 1000 Btu Natural Gas — , the main supply pipe diameter should be 3 in. (76 mm).
IMPORTANT: Gas loop piping must be installed as illustrated to equalize gas pressure for all tumble dryers
connected to single gas service. Other gas using appliances should be connected upstream from loop.
1 Gas furnace [120,000 Btu/hr. (127 Mj/hr., 35.2 kW)]
2 Gas water heaters [400,000 Btu/hr. (422 Mj/hr., 117.2 kW) each]
3 Gas space heaters [70,000 Btu/hr. (79 Mj/hr., 20.5 kW) each]
4 Sediment traps, supply pressure taps and shut-off valves. Refer to Figure 15 .
5 1 in. (25.4 mm) gas pipe loop
6 19 ft. (5.8 m)
7 Minimum Pipe Size is 0.75 in. (19 mm) for 120 Series Gas, 1 in. (25.4 mm) for 170 and 200 Series Gas.
8 25 ft. (7.6 m)
9 Main regulator
10 Gas meter
11 Pressure regulator (if required)
12 120 series tumble dryers = 270,000 Btu/hr. (285 Mj/hr.,79.13 kW) each; 170 series tumble dryers = 395,000 Btu/hr.
(417 Mj/hr., 115.77 kW) each; 200 series tumble dryers = 425,000 Btu/hr. (448 Mj/hr., 124.56 kW) each
Figure 16
Summary of Contents for LDR-900-S
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