Sewage Pump Station Emergency Overflow Prevention

[stanier]

The current project involves the upgrade of 350 pump stations in Sydney NSW Asutralia to prevent dry weather overflows. Conventional wisdom is to provide balance tanks to prevent an overflow due to loss of power etc. Thye size of the tank is based on the response time and the consequences/likelihood of events occurring.

Have any planners or designers in this forum other novel methods of providing protection from overflows in the event of failure of the pumps or other emergency condition? Can you steer me to websites where there may be technical data on such solutions.

 

[sow]

The sites I have seen and designed very rarley have the systems you talk about. These sites are predominatly UK sites. Generally for pump failiure, a standby pump is installed, an alarm signal is sent to telemetry / scada to inform the conttrrol centre that repairs are required. For power failiure a standby power generator is incorporated, howvere this is only on sites wherer there is a high risk (liklihood x severity)of the power failing. A Hi-HI float or probe signal creates another alarm to tell the control centre that the sump is backing up over designed levels. Upon this a temporary pump can be put in the sump at ground level and conected to the main via a bauer coulping.

Cheers

James

 

[quark]

Stanier!

For one chilled water application, where the tank volume would be celestial had we considered the overflow, we have gone for automatic normally open on/off valves which close upon failure of power supply. If you take power supply to these valves in series with pumps starter overflow can be prevented even incase of pump failure.

Regards,

 

[marktb]

The only method I know is to use a standby generator with auto changeover contactor.

The use of actuated valves would not solve your problem as any restriction on flow into the pumping station will just cause the incoming sewer to back and then flood out through the lower manholes on the incoming sewer.