Technically, it IS a modification, and generally modifications need to comply with current codes. Unless of course, waived by the authorities having jurisdiction. Best check it out.
Tony -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Ed Kramer Sent: June 4, 2008 10:32 PM To: [email protected] Subject: RE: calcs with pipe replacement If I had high confidence of all the following, I wouldn't see the need for new calcs: - Strictly pipe replacement (no added offsets, elbows, riser nipples, etc) - The original calcs were accurate (done properly and reflect 'as built' conditions) - Water supply hasn't deteriorated. A bit of a side note - if the attic has a roof with slope greater than 2/12, the design area very likely didn't include a 30% increase for the slope. That requirement didn't appear in 13 until 1996. But since the pipe replacement is legitimately a repair, you probably don't need to meet any standard other than what was in effect 17 years ago. Ed Kramer Littleton, CO > 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)
