You have to use a C of 120 if you use Hazen-Williams, but you can use
the roughness of new pipe (C=150+) if you use Darcy Weisbach method, so
you'll probably end up with less friction loss.
The Darcy Weisbach requirement is there only because you can't account
for viscosity with Hazen Williams. That means you're supposed to use the
viscosity figure for your antifreeze water mix at the minimum
temperature you expect it to see. As Roland says, it actually is only an
issue for the non-glycol antifreezes.
Joe
Joe
Ed Kramer wrote:
Forum members - your opinions on the following situation, please:
Design standard is 13R 2007 edition. System type will be antifreeze with a
volume exceeding 40 gallon.
Per 13R section 6.8.4, "Piping shall be sized using hydraulic calculation
procedures in accordance with NFPA 13". NFPA 13 says to use the
Darcy-Weisbach method (section 22.4.4.5.1).
Do you think it's the intent of 13R to require the calcs be done using
Darcy-Weisbach?
Ed Kramer
Littleton, CO
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