Sounds like the ahj grew up in pipe schedule days where bigger always fed smaller. Same guys that call an outside bell a water motor gong, even if electric. An example that is explicit in 13: adding a return bend by replacing a 1/2" upright with a nipple and 1x1/2x1 tee. Without looking it up, I believe you can go as much as 6" on the 1/2 nip.
Dave David A. de Vries, P.E., CSP Firetech Engineering Incorporated --- On Thu, 11/11/10, Todd Williams <[email protected]> wrote: From: Todd Williams <[email protected]> Subject: reduce then increase pipe sizes To: [email protected] Date: Thursday, November 11, 2010, 7:50 AM 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)
