AJAX BOILER INC. Page 9
Size of Piping to Gas Boilers In determining the size of gas pipe, the following factors should be considered: a.) Length of pipe and number of fittings. b.) Maximum gas consumption to be provided for (including possible future expansion). c.) Allowable loss in pressure from meter outlet to boiler. The volume to be used (in cubic feet per hour) shall be determined, whenever possible, directly from BTU ratings of the boiler which will be installed and the heating value of the gas to be used. To obtain the cubic feet per hour, divide the total BTU input of the boiler by the BTU heating value per cubic foot of gas.
PIPE DELIVERY SCHEDULE Length of Pipe in Feet 10 20 30 40 50 75 100 150
1” 520 350 285 245 215 175 150 120
1-1/4” 1,050 730 590 500 440 360 305 250
1-1/2” 1,600 1,100 890 760 670 545 460 380
2” 3,050 2,100 1,650 1,450 1,270 1,020 870 710
2-1/2” 4,800 3,300 2,700 2,300 2,000 1,650 1,400 1,130
3” 8,500 5,900 4,700 4,100 3,600 2,900 2,500 2,000
4” 17,500 12,000 9,700 8,300 7,400 6,000 5,100 4,100
*
Capacity of Pipes in Cubic Feet of Gas per Hour ** Pipe sizes in the table are based on a pressure drop of 0.3 inches water column and a specific gravity of 0.60.
ADDITIONAL LENGTH OF PIPE TO BE ADDED
FOR EACH ELBOW OR TEE BEND IN THE LINE Pipe Size Inches 1 1-1/4 1-1/2 2 3 4 Fl. 6 Fl.
Elbow 2.62 ft. 3.45 ft. 4.02 ft. 5.17 ft. 7.67 ft. 5.37 ft. 8.09 ft.
Tee 5.24 ft. 6.90 ft. 8.04 ft. 10.3 ft. 15.3 ft. 15.1 ft. 22.8 ft.
6” 44,000 31,000 25,000 22,000 19,000 16,000 14,000 11,600