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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.
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:
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. Leave a Reply. |
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