Economical Sizing
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ECONOMICAL SIZING OF DISTRIBUTION PIPING.
An equation for the most economical pipe diameter for a distribution system for water is
D=0.215*(fbQ3aS/aiHa)1/7
where
D= pipe diameter, ft (m)
f =Darcy–Weisbach friction factor
b =value of power, $/hp per year ($/kW per year)
Qa= average discharge, ft3/s (m3/s)
S =allowable unit stress in pipe, lb/in2 (MPa)
a= in-place cost of pipe, $/lb ($/kg)
i =yearly fixed charges for pipeline (expressed as a fraction of total capital cost)
Ha =average head on pipe, ft (m)
