Fire hydrant flow test question - is the pitot the same as the residual pressure on a water flow test from a fire hydrant?
Is it possible to know the residual pressure and 'chart out' the flow of the fire hydrant, or is there a way to determine the flow with only the static and residual pressures? Posted anonymously for discussion. Discuss This | Submit Your Question | Subscribe
5 Comments
Mike L
12/27/2019 08:09:36 am
Pitot Pressure and Residual Pressure are two separate measurements. Pitot pressure is used to calculate the flow rate from the hydrant that correlates to the residual pressure being read.
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Wayne Ammons
12/27/2019 09:17:05 am
To add to what Mike said, you can conduct a flow test if you do not have a pitot tube:
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joe
12/28/2019 02:26:17 pm
What do you do if the city fire don't have a residual for a preliminary calculation on a bid? some cities i deal with only have static and pitot it is not smart to drive 2 hours one-way for to make flow test on a job you may not get. i just trying to figure out a way to get a residual what the city doesn't have a residual pressure.
Joe Meyer
12/30/2019 07:41:29 am
We don't have flow test information for many bids we go after. It's extremely annoying and not helpful to the project.
Mike L
12/30/2019 02:43:49 pm
1 more thought...I believe that in order for a water supply to be considered a municipal supply, it must be able to deliver a minimum of 20 psi residual. So you could use that as a basis to develop your bid/pump requirement. I would qualify the bid stating that absent of verified residual pressure an assumption of 20 psi was assumed.
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