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PROPORTIONING THE SIZE OF MAINS

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For any size system of steam or water heating the following rule will be found entirely satisfactory for mains 100 feet long; for each 100 feet additional use a size larger ratio.

Rule.—

r = (3.1416/d)R = a/r × 100.

r represents ratio of main in inches for each 100 feet of surface; d, diameter of pipe; R, quantity of radiation carried by size of pipe; a, area of pipe in inches.

From this the following table has been constructed:

Diameter of pipe Area of pipe Ratio to each 100 feet of surface Quantity of radiation, steam or water, on a given size pipe
1.767 2.10 84
2 3.141 1.57 200
4.908 1.25 400
3 7.069 1.04 700
9.621 0.90 1,062
4 12.566 0.78 1,590
15.904 0.70 2,272
5 19.625 0.63 3,120
6 28.274 0.52 5,440
7 38.484 0.45 8,550
8 50.265 0.40 12,556
9 63.617 0.35 18,100
10 78.540 0.30 25,300
Mechanics of the Household

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