You're missing the code citation he can't furnish. If it works hydraulically, it works. I recall a raised eyebrow on a 4" riser feeding a 6" crossmain; very simply, I used the excess pressure where it saved my boss the most money, in the riser devices. But nothing in 13 says you need to go from big to small consistently.
-----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Todd Williams Sent: Thursday, November 11, 2010 8:51 AM To: [email protected] Subject: reduce then increase pipe sizes I am working on an existing system where we have to tie in a new 2-1/2" main into an existing 3". Since they do not make a 3x2-1/2 mechanical tee, that option is out. My proposal is to utilize an existing plugged 2" outlet, install a 2 x 0-6 TxG nipple and then increase to 2-1/2". It works hydraulically with 18+ psi left over (reducing the 2-1/2" main not an option hydraulically). I don't see anything in the Code that states that it is not allowed. However, the AHJ says it isn't. Before I argue the point, am I missing something? Todd G. Williams, PE Fire Protection Design/Consulting Stonington, CT 860.535.2080 www.fpdc.com _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field)
