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42 M412616 Example of Gas Loop Piping IMPORTANT: Gas loop piping must be installed as illustrated to equalize gas pressure for all tumblers connected to single gas service. Other gas using appliances should be connected upstream from loop. GAS METER GAS LINE PRESSURE TAP TUMBLERS ONE INCH (2.54 cm) PIPE GAS LOOPNOTE: Minimum pipe size to GAS SPACE HEATER GAS SHUT-OFF VALVES PRESSURE GAS WATER HEATERS MAIN REGULATOR tumbler is 1/2" (1.27 cm) REGULATOR T034IE3D (If required) IMPORTANT: Line pressure must be maintained at 6-1/2" ± 1-1/2" water column inches (1.62 ± .37 kPa) for Natural Gas (11 ± .3 water column inches for L.P. Gas) (2.74 ± .07 kPa) with all gas appliances running (tumblers, water heaters, space heaters, furnace, etc.). An in-line pressure regulator may be required on Natural Gas models if the line pressure exceeds eight water column inches (2.00 kPa) pressure with all gas appliances firing. Figure 20 Example of Gas Supply Piping NOTE: See BTU/HR. rating GAS on dryer nameplate. FURNACE (120,000 BTU/HR.) 1 2 3 4 5 6 7 8 9 SAMPLE CALCULATIONS: Equivalent Length = Total length of main gas supply pipe from the gas meter to the far end of the tumbler dryers. = 25' + 19' (7.6 m + 5.8 m) gas supply pipe. = 44' (13.4 m) Total Gas Liner GAS WATER HEATERS (400,000 BTU/HR. each) MAIN REGULATOR GAS TUMBLER DRYERS (75,000 BTU/HR. each) GAS METER 19' (5.8 m) 25' (7.6 m) PRESSURE REGULATOR Total BTU/HR = The sum of the BTU/HR. of all tumblers being fed by the main gas supply pipe. = 9 x 75,00019' (5.8 m) GAS SPACE HEATERS (70,000 BTU/HR. each) = 675,000 BTU/HR. T035IE3E Using the table in Figure 22, the main supply pipe diameter should be 2" (5.08 cm). Figure 21 M412616 43 GAS PIPE SIZE REQUIRED FOR 1,000 BTU NATURAL GAS — .64 SPECIFIC GRAVITY AT 6. ± ±±±±± 1. INCH WATER COLUMN PRESSURE (1.62 ± .37 kPa) EQUIVALENT LENGTH 25 FT. 50 FT. 75 FT. 100 FT. 125 FT. 150 FT. GAS (7.63 m) (15.25 m) (22.88 m) (30.50 m) (38.13 m) (45.75 m) APPLIANCES TOTAL BTU/HR. (Kcal/hr) BASED ON 0.3" WATER COLUMN (0.75 mBar) PRESSURE DROP FOR LENGTH GIVEN 100,000 (25,200) 120,000 (30,240) 140,000 (35,280) 160,000 (40,320) 180,000 (45,360) 200,000 (50,400) 300,000 (75,600) 400,000 (100,800) 500,000 (126,000) 600,000 (151,200) 700,000 (176,400) 800,000 (201,600) 900,000 (226,800) 1,000,000 (252,000) 1,100,000 (277,200) 1,200,000 (302,400) 1,300,000 (327,600) 1,400,000 (352,800) 1,500,000 (378,600) 1,600,000 (403,200) 1,700,000 (428,400) 1,800,000 (453,600) 1,900,000 (478,800) 2,000,000 (504,000) 2,200,000 (554,400) 2,400,000 (604,800) 2,600,000 (655,200) 2,800,000 (705,600) 3,000,000 (756,000) ..." (1.905cm) ..." (1.905cm) ..." (1.905cm) ..." (1.905cm) 1" (2.54cm) 1" (2.54cm) 1" (2.54cm) 1..." (3.18cm) 1..." (3.18cm) 1..." (3.81cm) 1..." (3.81cm) 1..." (3.81cm) 2" (5.08cm) 2" (5.08cm) 2" (5.08cm) 2" (5.08cm) 2" (5.08cm) 2" (5.08cm) 2" (5.08cm) 2" (5.08cm) 2" (5.08cm) 2...” (6.35cm) 2..." (6.35cm) 2..." (6.35cm) 2..." (6.35cm) 2..." (6.35cm) 2..." (6.35cm) 2..." (6.35cm) 2..." (6.35cm) ..." (1.905cm) 1" (2.54cm) 1" (2.54cm) 1" (2.54cm) 1" (2.54cm) 1" (2.54cm) 1..." (3.18cm) 1..." (3.18cm) 1..." (3.81cm) 1..." (3.81cm) 2" (5.08cm) 2" (5.08cm) 2" (5.08cm) 2" (5.08cm) 2" (5.08cm) 2" (5.08cm) 2..." (6.35cm) 2..." (6.35cm) 2..." (6.35cm) 2..." (6.35cm) 2..." (6.35cm) 2..." (6.35cm) 2..." (6.35cm) 2..." (6.35cm) 3" (7.62cm) 3" (7.62cm) 3" (7.62cm) 3" (7.62cm) 3" (7.62cm) 1" (2.54cm) 1" (2.54cm) 1" (2.54cm) 1" (2.54cm) 1" (2.54cm) 1..." (3.18cm) 1..." (3.18cm) 1..." (3.81cm) 1..." (3.81cm) 2" (5.08cm) 2" (5.08cm) 2" (5.08cm) 2" (5.08cm) 2" (5.08cm) 2..." (6.35cm) 2..." (6.35cm) 2..." (6.35cm) 2..." (6.35cm) 2..." (6.35cm) 2..." (6.35cm) 2..." (6.35cm) 3" (7.62cm) 3" (7.62cm) 3" (7.62cm) 3" (7.62cm) 3" (7.62cm) 3" (7.62cm) 3" (7.62cm) 3..." (8.89cm) 1" (2.54cm) 1" (2.54cm) 1" (2.54cm) 1..." (3.18cm) 1..." (3.18cm) 1..." (3.18cm) 1..." (3.81cm) 1..." (3.81cm) 2" (5.08cm) 2" (5.08cm) 2" (5.08cm) 2" (5.08cm) 2..." (6.35cm) 2..." (6.35cm) 2..." (6.35cm) 2..." (6.35cm) 2..." (6.35cm) 2..." (6.35cm) 2..." (6.35cm) 3" (7.62cm) 3" (7.62cm) 3" (7.62cm...

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