Slant/Fin GAS Modular Boilers, Инструкция по применению, Страница: 12 / 24

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Table 5. Characteristics of various fuel gases
Table 6. Gas main sizing guide
Natural 1000 Btu 1.00
Propane 2500 Btu 1.10
Type
of Gas
Heating
Valve*†
Flow
Correction
Factor
* per cubic foot
† Consult fuel supplier for actual BTU value.
10 20 30 40 50 60 70
1/4 .364 32 22 18 15 14 12 11
3/8 .493 72 49 40 34 30 27 25
1/2 .622 132 92 73 63 56 50 46
3/4 .824 278 190 152 130 115 105 96
1 1.049 520 350 285 245 215 195 180
1 1/4 1.380 1,050 730 590 500 440 400 370
1 1/2 1.610 1,600 1,100 890 760 670 610 560
2 2.067 3,050 2,100 1,650 1,450 1,270 1,150 1,050
2 1/2 2.469 4,800 3,300 2,700 2,300 2,000 1,850 1,700
3 3.068 8,500 5,900 4,700 4,100 3,600 3,250 3,000
4 4.026 17,500 12,000 9,700 8,300 7,400 6,800 6,200
80 90 100 125 150 175 200
1/4 .364 11 10 9 8 8 7 6
3/8 .493 23 22 21 18 17 15 14
1/2 .622 43 40 38 34 31 28 26
3/4 .824 90 84 79 72 64 59 55
1 1.049 170 160 150 130 120 110 100
1 1/4 1.380 350 320 305 275 250 225 210
1 1/2 1.610 530 490 460 410 380 350 320
2 2.067 990 930 870 780 710 650 610
2 1/2 2.469 1,600 1,500 1,400 1,250 1,130 1,050 980
3 3.068 2,800 2,600 2,500 2,200 2,000 1,850 1,700
4 4.026 5,800 5,400 5,100 4,500 4,100 3,800 3,500
Nominal
Iron Pipe
Size
Inches
Internal
Diameter
Inches
Equivalent
Length of Pipe, Feet
Maximum capacity of pipe in cubic
feet of gas per hour for gas pres-
sures of 0.5 psig or less and a
pressure drop of 0.3 inch water
column (based on a 0.60 specific
gravity gas).