Pool drain velocity
Pool drain velocity
(OP)
One of the requirements for a pool at a rv park is that the re-circulation system has to be designed so that velocities do not exceed 6 fps. Based on the pools size and that the entire volume has to be circulated every 6 hours I have determined that the circulation rate needs to be 118 gpm. There will be two main drains connected to one 1-1/2" diameter pipe that runs back to the mechanical room. How would I determine the velocity in this pipe? Thanks in advance.





RE: Pool drain velocity
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RE: Pool drain velocity
A 1.5" Steel Pipe, at 120 gpm, would have a flow velocity of 18.9 ft/s.
A 1.5" Copper Pipe, at the same conditions, would have a flow velocity of 19.1 ft/s.
I would recommend increasing the drain pipe size back to the mechanical room or increase the circulation cycle to lower the flow.
RE: Pool drain velocity
RE: Pool drain velocity
Anyway, at the flows suggested, the pipe is too small for the maximum velocity.
RE: Pool drain velocity
https://www.maricopa.gov/EnvSvc/AboutUs/pdf/C6S3.p...
RE: Pool drain velocity
The hazards of pool drains have been known for some time:
https://www.nachi.org/pool-drain-hazards-inspectio...