Page 125 - Facility Piping Systems Handbook for Industrial, Commercial, and Healthcare Facilities

PIPING

PIPING 2.75

FIGURE 2.42 Insulation over a split ring hanger. (Courtesy Mica.)

1. Calculate the weight of the pipe using the following formula:

W = F × 10.68 × T × (O.D. − T) (2.2)

where W = weight of pipe, lb/ft
F = relative weight factor, see Table 2.12
T = wall thickness of pipe
O.D. = outside diameter of pipe, in

Note: Add a safety factor of 5 percent for tolerance in pipe manufacturing.
2. Determine the weight of the water contained in the pipe. Refer to Table 2.13 for the
water weight based on the size of the pipe. The quantity and weight of water shown for
steel pipe should be used for all pipe. They are well within the accuracy and safety factors
expected for selection of hangers.
3. Calculate the weight of insulation on the pipe. For standard insulation and thickness, use
the following formula:
W = F × D (2.3)

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