yes ----- Original Message ----- From: "Todd Williams - FPDC" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Wednesday, June 04, 2008 3:56 PM Subject: calcs with pipe replacement
> I walked through an attic this afternoon where all of the existing > mains need to be replaced. The piping is 3" schedule 10 black steel, > that is developing leaks after 17 years (we found another one on our > tour). The proposal is out there to replace the existing with 3" > schedule 40 galvanized (and provide proper pitch). I did a couple of > quick calculations and at 250 gpm, the friction loss per foot for the > two pipes is very close to the same. (.077 for the sch 10 black v. > .075 for the sch 40 galv). My guess is that the difference in > pressure would be about 0.75 psi. The calc has about 12 psi > remaining. If this was strictly a pipe replacement (no other > modifications), would you recommend new hydraulic calculations? > > Todd G. Williams, PE > Fire Protection Design/Consulting > Stonington, Connecticut > www.fpdc.com > 860.535.2080 > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum > > To Unsubscribe, send an email to:[EMAIL PROTECTED] > (Put the word unsubscribe in the subject field) > _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field)
