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
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