TM 5-848-1/AFM 88-12, Chap.1
(b) If figure 1 shows the flow to be in the
curve, then the smooth pipe flow law is applicable.
In specific cases where the flow is rather high and
range where the smooth pipe flow law equation or
a comparison of pressure drop between plastic pipe
laminar flow equation (partially turbulent flow)
and steel or cast iron is desired, the following
apply for the steel or cast-iron pipe being consid-
method is suggested:
ered, then there is no advantage for plastic be-
(a) Determine whether partially or fully
cause of reduced pipe surface friction.
(c) If figure 1 shows that the rough pipe flow
turbulent flow formulas are applicable for figure 1
using the given flow and pipe size.
law (fully turbulent flow) applies, then there
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