Wayne SC80, User Manual, Page: 10 / 29

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Table 2: Pipe Sizing Chart for Natural Gas (0-0.5 psi) with Straight Schedule 40 Metal Pipe
The following chart is based on 0-0.5 psi inlet pressure, specific gravity of 0.6 , and a pressure loss of 0.5” w.c..
Maximum Capacity of Pipe Size in Btu per Hour
Length of
Pipe (ft)
1/2” 3/4” 1” 1 1/4” 1 1/2”
10 175,000 360,000 680,000 1,400,000 2,100,000
20 120,000 250,000 465,000 950,000 1,460,000
30 97,000 200,000 375,000 770,000 1,180,000
40 82,000 170,000 320,000 660,000 990,000
50 73,000 151,000 285,000 580,000 900,000
60 66,000 138,000 260,000 530,000 810,000
70 61,000 125,000 240,000 490,000 750,000
80 57,000 118,000 220,000 460,000 690,000
90 53,000 110,000 205,000 430,000 650,000
100 50,000 103,000 195,000 400,000 620,000
150 40,000 84,000 160,000 325,000 500,000
200 35,000 72,000 135,000 280,000 430,000
Table 3: Pipe Sizing Chart for Liquid Propane (11” w.c.) with Straight Schedule 40 Metal Pipe
The following chart is based on 11” w.c. inlet pressure and a pressure drop of 0.5” w.c.
Special use: Piping sizing between single or second stage (low pressure regulator) and appliance.
Maximum Capacity of Pipe Size in Btu per Hour
Pipe
Size
1/2” 3/4” 1” 1 1/4” 1 1/2” 2” 3”
Actual ID 0.622 0.824 1.049 1.38 1.61 2.067 3.068
Length
of Pipe
(feet)
Maximum Capacity in Btu/hr
10 291,000 608,000 1,145,000 2,352,000 3,523,000 6,786,000 19,119,000
20 200,000 418,000 787,000 1,616,000 2,422,000 4,664,000 13,141,000
30 160,000 336,000 632,000 1,298,000 1,945,000 3,745,000 10,552,000
40 137,000 287,000 541,000 1,111,000 1,664,000 3,205,000 9,031,000
50 122,000 255,000 480,000 984,000 1,475,000 2,841,000 8,004,000
60 110,000 231,000 434,000 892,000 1,337,000 2,574,000 7,253,000
80 94,000 197,000 372,000 763,000 1,144,000 2,203,000 6,207,000
100 84,000 175,000 330,000 677,000 1,014,000 1,952,000 5,501,000
125 74,000 155,000 292,000 600,000 899,000 1,730,000 4,876,000
150 67,000 140,000 265,000 543,000 814,000 1,568,000 4,418,000
200 58,000 120,000 227,000 465,000 697,000 1,342,000 3,781,000
250 51,000 107,000 201,000 412,000 618,000 1,189,000 3,351,000
300 46,000 97,000 182,000 373,000 560,000 1,078,000 3,036,000
350 42,000 89,000 167,000 344,000 515,000 991,000 2,793,000
400 40,000 83,000 136,000 320,000 479,000 922,000 2,599,000