Hydrant Orifice Coefficient
Hydrant Orifice Coefficient
(OP)
When doing flow tests, I was always taught to feel the inside of the hydrant butt, record the shape, and apply the correct coefficient in my flow calc - 0.7 for protruding edge, 0.8 for square corners, and 0.9 for rounded corners. When referring to my "quick convert" pitot charts, a discharge coeffiecient of 1 is always used.
My question is, am I seriously shortchanging myself when subtracting 20% (i.e 0.8 for square corners)in the flow calc?
Any insight would be greatly appreciated.
...using Q=29.83cd^2p^.5 where c is the variable in question...
My question is, am I seriously shortchanging myself when subtracting 20% (i.e 0.8 for square corners)in the flow calc?
Any insight would be greatly appreciated.
...using Q=29.83cd^2p^.5 where c is the variable in question...





RE: Hydrant Orifice Coefficient
I've never seen a hydrant with square corners. I am aware of the .80 for square corners but I've never run across any.
RE: Hydrant Orifice Coefficient
RE: Hydrant Orifice Coefficient
Travis Mack
MFP Design, LLC
www.mfpdesign.com
RE: Hydrant Orifice Coefficient
as usual, I leave this forum smarter than when I came.
Thanks for the responses.