TABLE 9
GAS PIPE CAPACITY − FT3/HR (KL/HR)
Nominal
Iron Pipe Size
Inches(mm)
Internal
Diameter
Inches(mm)
Length of Pipe - Feet (m)
10 | 20 | 30 | 40 | 50 | 60 | 70 | 80 | 90 | 100 |
(3.048) | (6.096) | (9.144) | (12.192) | (15.240) | (18.288) | (21.336) | (24.384) | (27.432) | (30.480) |
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1/4 | .364 | 43 | 29 | 24 | 20 | 18 | 16 | 15 | 14 | 13 | 12 |
(6.35) | (9.246) | (1.13) | (.82) | (.68) | (.57) | (.51) | (.45) | (.42) | (.40) | (.37) | (.34) |
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3/8 | .493 | 95 | 65 | 52 | 45 | 40 | 36 | 33 | 31 | 29 | 27 |
(9.53) | (12.522) | (2.69) | (1.84) | (1.47) | (1.27) | (1.13) | (1.02) | (.73) | (.88) | (.82) | (.76) |
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1/2 | .622 | 175 | 120 | 97 | 82 | 73 | 66 | 61 | 57 | 53 | 50 |
(12.7) | (17.799) | (4.96) | (3.40) | (2.75) | (2.32) | (2.07) | (1.87) | (1.73) | (1.61) | (1.50) | (1.42) |
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3/4 | .824 | 360 | 250 | 200 | 170 | 151 | 138 | 125 | 118 | 110 | 103 |
(19.05) | (20.930) | (10.19) | (7.08) | (5.66) | (4.81) | (4.28) | (3.91) | (3.54) | (3.34) | (3.11) | (2.92) |
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1 | 1.049 | 680 | 465 | 375 | 320 | 285 | 260 | 240 | 220 | 205 | 195 |
(25.4) | (26.645) | (919.25) | (13.17) | (10.62) | (9.06) | (8.07) | (7.36) | (6.80) | (6.23) | (5.80) | (5.52) |
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1−1/4 | 1.380 | 1400 | 950 | 770 | 660 | 580 | 530 | 490 | 460 | 430 | 400 |
(31.75) | (35.052) | (39.64) | (26.90) | (21.80) | (18.69) | (16.42) | (15.01) | (13.87) | (13.03) | (12.18) | (11.33) |
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1−1/2 | 1.610 | 2100 | 460 | 1180 | 990 | 900 | 810 | 750 | 690 | 650 | 620 |
(38.1) | (40.894) | (59.46) | (41.34) | (33.41) | (28.03) | (25.48) | (22.94) | (21.24) | (19.54) | (18.41) | (17.56) |
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2 | 2.067 | 3950 | 2750 | 2200 | 1900 | 1680 | 1520 | 1400 | 1300 | 1220 | 1150 |
(50.8) | (52.502) | (111.85) | (77.87) | (62.30) | (53.80) | (47.57) | (43.04) | (39.64) | (36.81) | (34.55) | (32.56) |
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2−1/2 | 2.469 | 6300 | 4350 | 3520 | 3000 | 2650 | 2400 | 2250 | 2050 | 1950 | 1850 |
(63.5) | (67.713) | (178.39) | (123.17) | (99.67) | (84.95) | (75.04) | (67.96) | (63.71) | (58.05) | (55.22) | (52.38) |
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3 | 3.068 | 11000 | 7700 | 6250 | 5300 | 4750 | 4300 | 3900 | 3700 | 3450 | 3250 |
(76.2) | (77.927) | (311.48) | (218.03) | (176.98) | (150.07) | (134.50) | (121.76) | (110.43) | (104.77) | (97.69) | (92.03) |
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4 | 4.026 | 23000 | 15800 | 12800 | 10900 | 9700 | 8800 | 8100 | 7500 | 7200 | 6700 |
(101.6) | (102.260) | (651.27) | (447.39) | (362.44) | (308.64) | (274.67) | (249.18) | (229.36) | (212.37) | (203.88) | (189.72) |
NOTE − Capacity given in cubic feet (m3 ) of gas per hour and based on 0.60 specific gravity gas.
Leak Check | The furnace must be isolated from the gas supply system | |
After gas piping is completed, carefully check all piping | by closing its individual manual | |
pressure testing of the gas supply system at pressures | ||
connections (factory- and | ||
equal to or less than 1/2 psig (3.48 kPa). | ||
a leak detecting solution or other preferred means. | ||
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WARNING
FIRE OR EXPLOSION HAZARD
Failure to follow the safety warnings exactly could result in serious injury, death or property damage.
Never test for gas leaks with an open flame. Use a commercially available soap solution made specifi- cally for the detection of leaks to check all connec- tions. A fire or explosion may result causing proper- ty damage, personal injury or loss of life.
NOTE − In case emergency shutdown is required, shut off the main manual gas valve and disconnect the main power
to the furnace. These devices should be properly labeled
by the installer.
IMPORTANT
When testing pressure of gas lines, gas valve must be disconnected and isolated. See figure 14. Gas valves can be damaged if subjected to more than 1/2 psig (3.48 kPa).
MANUAL MAIN | ISOLATE | |
GAS | ||
SHUT−OFF VALVE | ||
VALVES | ||
WILL NOT HOLD | ||
FURNACE | ||
NORMAL TEST | ||
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PRESSURE |
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CAP |
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FIGURE 14
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