I have an application with a sewer pump station that is required due to long run of nearly flat pipe after an initial few feet drop. On install, siphon action is continuing the flow from pump station after pump Off Setpoint is reached due to the overall drop in elevation. We want to place a means to draw air into the forcemain to break siphon. The complication is that due to ledge, the forcemain leaving the pump station is not the high point in the piping. There is about an 8" rise in pipe elevation outside the tank. Ability to dig piping up and place a valve to introduce air at the actual high point and place it in a structure so that no sewage gets discharged if there is an issue is limited by ledge. Will placing a valve within the pump station at the point slightly lower (8") than the FM high point be adequate to break siphon? Would weep holes drilled within the pump station on the dual pump lines on the upstream side of the system's check valves be adequate to break siphon (i.e. once pumps stop and line isnt pressurized, will the bleeding of water out weepholes be enough to break siphon).
Any thoughts or suggestions would be welcome.
Any thoughts or suggestions would be welcome.