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Nominal
Iron Pipe Internal
Size, Diameter,
Inches Inches 10 20 30 40 50 60 70 80 90 100 125 150 175 200
¼ 0.364 43 29 24 20 18 16 15 14 13 12 11 10 9 8
3/8 0.493 95 65 52 45 40 36 33 31 29 27 24 22 20 19
½ 0.622 175 120 97 82 73 66 61 57 53 50 44 40 37 35
¾ 0.824 360 250 200 170 151 138 125 118 110 103 93 84 77 72
1 1.049 680 465 375 320 285 260 240 220 205 195 175 160 145 135
1-1/4 1.38 1400 950 770 660 580 530 490 460 430 400 360 325 300 280
1-1/2” 1.61 2100 1460 1180 990 900 810 750 690 650 620 550 500 460 430
2 2.067 3950 2750 2200 1900 1680 1520 1400 1300 1220 1150 1020 950 850 800
2-1/2 2.469 6300 4350 3520 3000 2650 2400 2250 2050 1950 1850 1650 1500 1370 1280
3 3.068 11000 7.7 6250 5300 4750 4300 3900 3700 3450 3250 2950 2650 2450 2280
4 4.026 23000 15800 12800 10900 9.7 8800 8100 7500 7200 6700 6000 5500 5000 4600
SEE FOLLOWING CHARTS FROM NFPN54, ANSI Z223.1 TO DETERMINE PROPER GAS SUPPLY LINE SIZE REQUIRED TO SUPPORT TOTAL BTU REQUIRE-
MENTS.
NA
TURAL GAS
Maximum Capacity of Pipe in Cubic Feet of Gas per Hour for Gas Pressures of 0.5 psig or Less and a Pressure Drop of 0.5 Inch Water Column.
(Based on a 0.60 Specific Gravity Gas)
LENGTH OF PIPE, FEET
* Pipe and Tubing Selection
Total piping length = 84 feet (use table 4 @ 90 feet)
From a to b, demand =200,000 + 38,000 +65,000+35,000
= 338,000 BTU/hr. use 1” pipe.
From b to c, demand = 38,000 + 65,000 + 35,000
= 138,000 BTU/hr; use ¾” pipe or 7/8” tubing.
From c to d, demand = 65,000 + 35,000
= 100,000 BTU/hr; use ¾” pipe or ¾” tubing.
From d to e, demand = 35,000 BTU/hr; use ½” pipe or 5/8” tubing.
From b to f, demand = 200,000 BTU/hr; use 1” pipe.
From c to g, demand = 38,000 BTU/hr; use ½” pipe or 5/8” tubing.
From d to h, demand = 65,000 BTU/hr; use ½” pipe or ¾” tubing.
Example 2.
Determine the sizes of piping or tubing required for the two-stage L.P.
Gas installation shown.
First Stage
Regulator
26
Feet
Second Stage
Regulator
Water
Heater
38,000
Furnace
200,000
58
Feet
Range
65,000
Clothes
Dryer
35,000
*Information from - REGO PRODUCTS
“LP GAS SERVICEMAN’S MANUAL”
SEE FOLLOWING PAGE FOR PIPE SIZING CHARTS FOR PROPANE GAS.
Page 7
Total first stage piping length = 26 feet; first stage regulator setting is 10 PSIG (use Table 1 or 3,
@ 30 feet)
From aa to a, demand = 338,000 BTU/hr; use ½” pipe, ½”
tubing, or ½” T plastic pipe.
Total second stage piping length = 58 feet (use table 4, @
60 feet).
From a to b, demand = 338,000 BTU/hr; use 1” pipe.
From b to c, demand = 138,000 BTU/hr; use ¾” pipe or 7/8”
tubing.
From c to d, demand = 100,000 BTU/hr; use ½” pipe or ¾”
tubing.
From d to e, demand = 35,000 BTU/hr; use ½” pipe or ½”
tubing.
From b to f, demand = 200,000 BTU/hr; use ¾” pipe.
From c to g, demand = 38,000 BTU/hr; use ½” pipe or 5/8”
tubing.