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Pressure Sewers - Anti-syphon protection

thread161-41328

Pressure Sewers - Anti-syphon protection

Pressure Sewers - Anti-syphon protection

(OP)
Would appreciate advice on best methods for mitigating siphoning problems that may occur following pump shut down in pressure sewer systems.
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RE: Pressure Sewers - Anti-syphon protection

Use an air/vacuum valve at high points in the line.  If possible, design the line so that it has a continuous upward slope in the direction of flow and no high or low points in between the pump and the outlet.

Apco and Crispen are two maufacturers of such valves in North America.

Russ Faust, PE
Salem, Oregon USA

RE: Pressure Sewers - Anti-syphon protection

I have designed several low pressure sewer systems and have always specified the grinder pumps to be supplied with anti-siphon valves to prevent the draining of the basin after the pumps shut off.  Some maufacturers supply there grinder pumps with the anti-siphon valves standard in the Basin and others have modified there standard models to conform with the specifications.

Hope this helps.

RE: Pressure Sewers - Anti-syphon protection

Check out www.ventomat.com and see their RGX type double sir vent. Lots of good advice on this site.

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