Page 33 - HVAC Pump Handbook

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Physical Data for HVAC System Design

30 The Basic Tools

2.7 Areas and Volumes of Pipe and Tanks

Table 2.7 provides the cross-sectional area, in equivalent square feet,
and the volume, in gallons, of commercial steel pipe and circular
tanks per linear foot of such pipe and tanks. The volume of the pipe or
tank can be determined by multiplying the cross-sectional area by the
length or height in feet. The volume in gallons per foot has been pro-
vided to simplify the calculations for HVAC water system volume and
tank storage.

2.8 Electrical Data
Following is a brief review of electrical power supplies and use with
HVAC pumps. Chapter 7 provides a detailed evaluation of electric
motors. The standard frequency for electric power in the United
States is 60 Hz (hertz), or cycles per second. Many foreign countries

TABLE 2.7 Areas and Volumes of Pipe and Tanks
Pipe Inside Volume, Inside Volume,
size diameter, in Area, ft 2 gal/ft diameter, in Area, ft 2 gal/ft
1
1 ⁄ 4 1.380 0.0104 0.078† 66 23.758 177.71†
1
1 ⁄ 2 1.610 0.0141 0.106 72 28.274 211.49
2 2.067 0.0247 0.185 84 38.485 287.87
1
2 ⁄ 2 2.469 0.0333 0.249 90 44.179 330.46
3 3.068 0.0513 0.384 96 50.266 375.99
4 4.026 0.0882 0.660 102 56.745 424.45
5 5.047 0.1389 1.039 108 63.617 475.86
6 6.065 0.2006 1.501 114 70.882 530.20
8 7.981 0.3474 2.599 120 78.540 587.48
10 10.02 0.5476 4.096 144 113.097 845.97
12 11.938 0.7773 5.814 168 153.938 1,151.46
14 13.124 0.9394 7.027 192 201.062 1,503.94
16 5.000 1.2272 9.180 216 254.469 1,903.43
18 16.875 1.5533 11.619 240 314.159 2,349.91
20 18.812 1.9302 14.438 288 452.389 3,383.87
24 22.624 2.7917 20.882 360 706.858 5,287.30
30 329.00* 4.5869 34.310 432 1,017.87 7,613.67
36 35.25† 6.8257 51.056 504 1,385.44 10,363.09
42 441.25† 9.2806 69.419 576 1,809.56 13,535.51
48 47.25† 12.1771 91.085 720 2,827.43 21,149.18
*All pipe sizes up to 24 in are schedule 40, while 30 in is schedule 20.
†Pipe sizes 36, 42, and 48 in are standard inside diameters.
NOTE: To convert the above volumes in gallons to pounds of water, multiply gallons by

Pounds of water
7.48
where is the specific weight of the water at the operating temperature. For example, water
3
at 45°F has a specific weight of 62.42 lb/ft , so a 10-in schedule 40 steel pipe has 4.096 gal/ft 3
3
or 34.18 lb/ft .

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