ZCYT series Sewage pump selection manual

Principal of Self Priming

Upon starting the pump, pressure drop occurs at the eye of the impeller which will give rise to pressure

differences within the pump system (pump casing & suction pipe) and outside the pump system. As the

pressure continues to drop in the pump system, a mixture of liquid and air will start to flow into the pump

due to higher atmospheric pressure outside the pump system.

The mixture of liquid and air will flow through the casing chamber designed like a diffuser through the inlet

and then to the discharge port. At the discharge port, air being lighter will be extricated through the

discharge piping. The liquid being heavier will fall back into the pump chamber and re-mix with the inlet

liquid. This process is repeated till air in the suction pipe and pump casing is fully emptied and filled with

liquid. At this point, the pump will then be fully primed and achieve the self-priming effect.

Application :

Industry

- Waste water treatment

- Transfer of low viscosity petroleum products

- Recovery of dirty solvents

- Emergency duty

Civil engineering / civil defence

- Sewer by-pass

- Recovery of hazardous liquids

- Flood drainage

Marine duty

- Bilge pumping

- Sanitary duty

- Loading and unloading

- Washing

- Fire fighting

Sewage

- Lift stations

- Sewage by-pass

- Treatment

Construction

- Dewatering

- Ground water control

- Water supply

Agriculture