Tom, I guess once we equate what goes out of the tachometer with what
goes into the thermometer, the speed does not change-- the magic of
the second law of thermodynamics! (or, as you put it-- 'Pump affinity').
Quoting Tom Duross tduro...@comcast.net:
Brad, we measure rpm as a means of
How about this from 20 (1999)...,
3.4.2 The base plate shall be securely attached to a solid foundation in
such a way that proper pump and driver shaft alignment will be ensured.
R/
Matt
-Original Message-
From: sprinklerforum-boun...@firesprinkler.org
I have the 99 edition, but know it is the others...,
A 11.2.6.3 outlines the test procedure.
Plus, I believe you will find that most Gate Valves are not listed for
throttle duty, but must be either fully open or full closed.
R/
Matt
-Original Message-
From:
Tom, let me back-up and try to benefit from your experience. The speed is
not suppose to change, but it does, right? Years ago I helped a fitter with
some annual tests-- no matter what the rating, we took all the readings at
several (increasing) flow rates. I think I remember the speed dropping,
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an arrow for me?
Thanks.
R/
Matt
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thanks DJJ8389, that's what I thought. I guess electric motor drive is
more consistent and closer to expectations than engine driven. As far
as Tom's 'adjusting the pressure to rated speed' goes though, with
electric we are at the mercy of the local Power and Light, whereas
with engine
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