Page 127 - Facility Piping Systems Handbook for Industrial, Commercial, and Healthcare Facilities

PIPING

PIPING 2.77

TABLE 2.13 Weight of Steel Pipe and Contained Water

Weight per foot, Length in feet containing Gallons in
IPS, in lb 1 ft of water 1 linear ft
3
1 0.42 0.005
/ 4
3 0.57 754 0.0099
/ 8
1 0.85 473 0.016
/ 2
3 1.13 270 0.027
/ 4
1 1.67 166 0.05
1 2.27 96 0.07
1 / 4
1
1 / 2 2.71 70 0.1
2 3.65 42 0.17
1
2 / 2 5.8 30 0.24

3 7.5 20 0.38
4 10.8 11 0.66
5 14.6 7 1.03
6 19.0 5 1.5
8 25.5 3 2.6
10 40.5 1.8 4.1
12 53.5 1.2 5.9
When insulation thickness is not standard or the pipe size is outside the values in Table 2.11,
use the following formula:

W = D × 0.0218 × T × (O.D. × T) (2.4)

where W = weight of insulation, lb/ft 3
D = density of insulation, lb/ft 3
T = wall thickness of insulation, in
O.D. = outside diameter, in
Add all three of the above figures together to find the total weight for any run of pipe
that must be supported. Then, determine the number of hangers required so that the weight
on any single hanger is less than the smallest weight allowed for any component of the
specific hanger assembly chosen.

Pipe Expansion
All piping materials will change dimensions as they expand and contract due to temperature
changes above and below the temperature at which they were installed. These dimensional
changes result in a change in the length of run of the pipe. If the piping network does not
have the necessary flexibility to compensate for the expansion and contraction, the resultant
stress could cause damage to connected equipment or cause the pipe to leak or fail com-
pletely. Thermal expansion of piping materials is given in Table 2.15.
The thermal expansion for plastic pipe is not linear, but increases with increasing
temperature. In the range of temperature encountered in general utility piping, this is not
a consideration.

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