A little more clarification to Taylor's response: It's only req'd for a 13D system IF you're using the simplified calculation method using only the static pressure. 13D then points you to their charts for friction loss which includes CPVC tees on the run. If you're calculating a 13D system using a *full flow test* then you're pointed to NFPA 13 which does not require tee's on the run as you pointed out. But you wouldn't include these on a 13 or 13R System, I believe it's in the manufacturer's data just in case you do need it.
JH On Mon, Dec 12, 2022 at 8:55 AM Taylor Schumacher <[email protected]> wrote: > Kyle, those lengths are to be used for 13D calculations. They’re allowed > omissions per NFPA 13 2016 23.4.4.8.1 (3). > > > > > > *Taylor Schumacher, ET* > > > > > > > > *From:* Kyle.Montgomery <[email protected]> > *Sent:* Monday, December 12, 2022 9:29 AM > *To:* [email protected] > *Subject:* [Sprinklerforum] Hydraulic Calculations for CPVC - Tees - > Straight-through Flow > > > > NFPA 13 clearly states that “fitting loss for straight-through flow in a > tee or cross shall not be included”. But some of the manufacturer’s data > for CPVC products specifically lists equivalent lengths for these fittings > (tee on the run) as well as for couplings. > > > > So, are those equivalent lengths intended/required to be included in the > hydraulic calculations? If so, is it all the time or only in certain > situations? Someone suggested to me that if might be a requirement of 13D > or 13R, but not 13. I haven’t found that yet, though. > > > > Thanks. > > > > -Kyle M > > > > _________________________________________________________ > SprinklerForum mailing list: > https://lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org > To unsubscribe send an email to > [email protected] >
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