Pumping Sewage

Unscreened raw sewage can, and often does contain:

Large solid objects, such as bricks, pieces of wood, etc

Large quantities of rag and fibres, often several metres in length
[pantyhose]

Quantities of abrasive grit and sand

Corrosive liquids resulting from seawater infiltration on coastal sites or industrial effluents, etc

Typical material removed from a 300mm conventional sewage pump

Network pumping stations, Transfer pump stations, Works inlet or terminal and combined sewage/stormwater pump stations will incur high costs if the pumps installed are not capable of working without blocking.

Raw sewage pumps must incorporate two essential features:

1. Ability to pass solid objects

2. Handle rags and fibrous material without blockage of the impeller

- Function of impeller free passage

- Function of blade geometry at impeller inlet

The Hidrostal screw centrifugal impeller is, by virtue of its axial extension, able to pass solids, and handle rags and fibrous material whilst at the same time avoiding compromising the hydraulic design. The axial extension provides sufficient freedom for the hydraulic designer to develop impellers of high efficiency which is important to clients who purchase equipment to minimise life cycle costs as well as providing blockage free operation.

Download sewage pumping pdf