Reservoir drainage wet well vacuum relief
Reservoir drainage wet well vacuum relief
(OP)
I am designing for a vacuum relief pipe for a drainage inlet wet well. A couple of 48" dia pipes from a reservoir drain into the wet well, which in turn is piped via a 72" dia pipe to a pump station. The design flow of the pump station is 160 MGD. The vacuum relief design is in anticipation of the either the reservoir inlet valves or pumps misfuctioning so that the pumps are pulling vacuum, requiring inlet air from the top of the wet well to prevent pump or wet well damage. The wet well is 90 ft tall and 14 ft dia. What factors would be used to calculate the size of the vacuum relief pipe?





RE: Reservoir drainage wet well vacuum relief
Make sure the vent can work if frosted over and that it is screened to keep critters out. The open area of the screens should exceed the pipe area.
Take a look at AWWA D100 for some suggestions and details.
RE: Reservoir drainage wet well vacuum relief