Owner's Manual

57
MAXIMUM CAPACITY OF PIPE (FT
3
/HR)
(Based on gas pressure at 0.5 psig., pressure drop of 0.3" water column, and 0.60 specic gravity.)
TO USE THIS TABLE: (1) ENTER THE TOP ROW AT THE TOTAL EQUIVALENT LENGTH OF PIPE OBTAINED
FROM 4.4.1 - 1). (2) MOVE DOWN TO THE EQUIVALENT GAS FLOW OBTAINED FROM 4.4.1 - 3). (3) MOVE
ACROSS TO THE LEFT HAND COLUMN. (4) READ THE REQUIRED PIPE SIZE.
CORRECTION FACTORS FOR SPECIFIC GRAVITY OTHER THAN .60
To use this table: (1) Read directly the multiplier for the specic gravity of the gas to be used. (2) Multiply actual
gas ow rates by this multiplier to obtain equivalent ow rates for .60 specic gravity gas. (3) Enter Figure 4.5 with
these equivalent gas ow rates to determine gas pipe sizes.
FIGURE 4-5
FIGURE 4-6
Nominal
Iron Pipe
Size, In.
Internal
Dia., In.
Length of Pipe, Feet
10 20 30 40 50 60 70 80 90 100 125 150 175 200
1/4 .364 32 22 18 15 14 12 11 11 10 9 8 8 7 6
3/8 .493 72 49 40 34 30 27 25 23 22 21 18 17 15 14
1/2 .622 132 92 73 63 56 50 46 43 40 38 34 31 28 26
3/4 .824 278 190 152 130 115 105 96 90 84 79 72 64 59 55
1 1.049 50 350 285 245 215 195 180 170 160 150 130 120 110 100
1-1/4 1.380 1,050 730 590 500 440 400 370 350 320 305 275 250 225 210
1-1/2 1.610 1,600 1,100 890 760 670 610 560 530 490 460 410 380 350 320
2 2.067 3,050 2,100 1,650 1,450 1,270 1,150 1,050 990 930 870 780 710 650 610
2-1/2 2.469 4,800 3,300 2,700 2,300 2,000 1,850 1,700 1,600 1,500 1,400 1,250 1,130 1,050 980
3 3.068 8,500 5,900 4,700 4,100 3,600 3,250 3,000 2,800 2,600 2,500 2,200 2,000 1,850 1,700
4 4.026 17,500 12,000 9,700 8,300 7,400 6,800 6,200 5,800 5,400 5,100 4,500 4,100 3,800 3,500
SpecicGravity Multiplier SpecicGravity Multiplier
.35 .763 1.00 1.29
.40 .813 1.10 1.35
.45 .862 1.20 1.40
.50 .909 1.30 1.47
.55 .962 1.40 1.53
.60 1.00 1.50 1.58
.65 1.04 1.60 1.63
.70 1.08 1.70 1.68
.75 1.12 1.80 1.73
.80 1.15 1.90 1.77
.85 1.19 2.00 1.83
.90 1.22 2.10 1.87