the ability of the chosen equation to reasonable predict friction
lose is not a function of what standard requires the calculation.
The sub-zero antifreeze systems with a high viscosity started this
ball rolling and nothing says at more normal temperatures (like 20 F)
the viscosity issue doesn't matter (so the academic hat is
overshadowing the practicality hat in this debate).
Roland
On Apr 17, 2008, at 2:59 PM, 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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