SELF PRIMING PUMPS
What are Self Priming Pumps?
A self priming pump is a centrifugal pump which eliminates the need for external priming devices. If a centrifugal pump is located above the suction vessel or sump (the pump is said to have a “suction lift”, it must be primed before it can be started, to remove air from the suction line and casing, and to fill the suction line and casing with liquid.
This must be done before starting the pump, otherwise the seals in the pump will be damaged. The priming operation on a regular centrifugal pump that is operating with a suction lift is done by ppulling a vacuum at the top of the pump casing, using a vacuum pump or the plant vacuum system.
A self priming pump eliminates the need for this external priming mechanism. When the pump is shut down, the liquid drains out of the suction line and back into the sump. However, due to the special design of a self-priming pump casing, a quantity of liquid remains in the bottom of the casing. When the pump is started again, the equipment goes through a priming cycle, which typically takes several minutes. During the priming cycle, the liquid that had remained in the pump casing is pushed by the impeller out the discharge, along with some of the air that is in the casing to create a vacuum at the impeller inlet, which draws liquid up the suction line.
Where are they used?
A Self priming pump can be used anywhere that a pump is running with a suction lift.
Generally a self priming pump is more expensive than a regular centrifugal pump, but a self priming pump eliminates the external priming mechanisms, and eliminates any bearings or motors down in the sump if a submersible pump is used.
Ideal for pumping liquids with solids in suspension, they are for applications where the main feature is the difficulty in priming and are used in:
- Construction industry
- Drilling plants
- Mining and Resource Industry
- Naval Water Transfer
- Agriculture and Irrigation
Centrifugal pumps - Self priming
LaBour 15W-DPL self-priming
Terada Serapura O.H.6 c/w 4KW FLP 4P
Varisco J70 3″ series JV type TWGS
Sanlian U4 100 x 100 self-priming trash
Macquarrie Kenflo FSR150 self-priming
Gorman Rupp T6A3-B 6″ self-priming trash
Canon Baoli 6″ (GR style) self-prime trash
Sanlian SPP6 150 x 150 self priming trash
Sanlian U6 150 x 150 self-priming
Gorman Rupp H18 8″ trash
Canon Baoli 8″ ZZB-2B self-priming trash
Sanlian SPP8 200 x 200 self priming
Gorman Rupp 10″ T10A3-B self-prime trash
CMC 10″ self-priming pump
Carver 10″ 10100
Sanlian SPP250 250 x 250 self priming trash