ReplyMaybe one has turning vanes and the other doesn't. Or long sweep vs short. There's likely a difference somewhere.
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I have just realized a huge difference in Loss coefficients values between SMACNA's Table 14-14 N, and ASHRAE's SR5-13, Rectangular Tee 45 degree diverging branch. ASHRAE seems to have much higher coefficient values for a given flow rate ratio (Qb/Qc).
Which standard do you recommend I follow?
Thanks,
Baradei
Professional Member
Maybe one has turning vanes and the other doesn't. Or long sweep vs short. There's likely a difference somewhere.
We are here on Earth to fart around ......Kurt Vonnegut
You can be anything you want......As long as you don't suck at it.
USAF 98 Bomb Wing 1960-66 SMW Lu49
Professional Member
I allways used SMACNA only because every plan/spec job I did required a SMACNA Duct Construction manual be with us on the job. Yes did get asked to see it on one job & only one.
Professional Member
Who required this?Originally Posted by oldguy1949
We are here on Earth to fart around ......Kurt Vonnegut
You can be anything you want......As long as you don't suck at it.
USAF 98 Bomb Wing 1960-66 SMW Lu49
Professional Member
Written in the specs by the engineer/architect. You allways read the specs before bidding don't you ? On a school job that had 3 suspended air handlers the engineer buried the spec on the safety drain pans in the book & not on the plans ,had to be 20 gauge or thicker & the sob actually got on a ladder with a sheetmetal guage when doing the final inspection.
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