they are tested at the velocity but they can sustain higher values.
There was a thread on this long ago. The manufacturers have a stated
value higher than 10ft/s but I cant remember what it is (due to
elevation sickness form standing on soap boxes)
Roland
On Jan 9, 2007, at 7:15 PM, Tom Duross wrote:
I think Thom might have been inferring that bfp's are listed at 10 fps
velocity for flow capacity.
If that flow is exceeded, the device could be damaged.
How many 1500 GPM pumps have 6" backflows on them because that's
the main
size? Well, there you go..
Tom Duross
Pats by 14
Just a follow-up to the bfp point....
Just as a side note Backflow preventors are tested and usually
listed at
10
Fps, if your exceeding the flow limits of the backflow preventor
you can
damage it in full forward flow testing.
Thom McMahon
Firetech, Inc.
2560 Copper Ridge Dr
Steamboat Springs, CO 80488-2136
Tel: 970-879-7952
Fax: 970-879-7926
Thom-
An interesting point...But what are we to do with this information?
I assume all of us take bfp pressure loss into account in our designs
using the mfg cut sheets and corresponding curves. Presumably if the
mfg provides the curves, then that is within the acceptable range of
operation of the bfp and the design is fine.
Are you simply making the point that you can damage the bfp if you
perform some type of test that takes it out of its range?
Paul Sincaglia, P.E.
Firesafety Solutions, Inc.
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