Self-priming pump solves sewage problem

A NSW council has upgraded
its vacuum sewage system transfer pump. The council using a lobe pump to
transfer raw sewage from their vacuum tank to their sewage treatment plant, but
the need for continued maintenance on the pumps was causing cost and logistics
issues.

The council had heard of the
success the Bundaberg Regional Council had when changing their Lobe Pumps to
Gorman-Rupp Ultra VS Series two-stage self-priming pumps. The application was
virtually the same, in that they have a vacuum tank that draws sewage through a
network of sewer lines that are kept under negative pressure by the vacuum
tank.

Then the vacuum tank fills, it
needs to be pumped out. Because the tank is under a vacuum [up to -80kPa], the
transfer pump needs to be able to pull a “suction lift” equivalent to this, and
still be able to produce discharge pressures high enough to transfer sewage to
the WWTP [in this case, an additional 60 metres, for a total dynamic head of 68
metres].

After reviewing the system, Hydro
Innovations selected the Gorman-Rupp VS3A60-B with a 45kW motor. The pump is
one of Gorman-Rupp’s Ultra VS Series of two-stage self-priming sewage pumps,
capable of producing heads to 90 metres. Being a self-priming pump, it is more
than capable of producing the required vacuum to overcome the negative pressure
inside the vacuum tank.

The pump comes standard with a
self-cleaning wear plate system to enable it to handle stringy materials such
as rags, has a large open impeller to handle larger solids and has a large removable
cover-plate for access into pump internals to remove large blockages or for
inspection.

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