Classification of Pumps

Positive Displacement Pump:

• The liquid or gas is displaced from the suction to the discharge side by variation of the volume inside one or more chambers.
• Used to handle a wide range of viscosity for small to medium discharge rates.
• Used as L.O. pump; F.O. & L.O. transfer pumps etc. on board ship.

 

The Typical Classification of Pumps: 

No.	Pump	Uses
01	Reciprocating pump	Bilge pump, Hydrophore pump
02	Vane pump	Air priming pump
03	Screw pump	L.O. pump
04	Gear pump	F.O. transfer pump
05	Combined pump	Hele Shaw pump for steering gear
06	Volute pump	Sea water pump
07	Diffuser pump	Boiler feed pump
08	Axial flow pump	Cargo pump

Dynamic Pressure Delivery Pump:

• A tangential acceleration is imparted to the fluid by some mechanical arrangement to create pumping action.
• Used to handle with low to medium viscous fluid for medium to high discharge rates.
• Centrifugal, axial & mixed flow pumps are used on board ship as SW; FW circulating Pumps; M/E & A/E cooling pump.

The Type of Pump Most Suitable for The Following Application:

No.	Use	Type	Reason
01	Main L.O. Circulating Pump	Screw type P.D. pump	Able to handle high viscous fluid/ air drawing
02	Domestic Fresh Water Supply	Single cylinder reciprocating P/P	High discharge pressure
03	Main Coolant Circulation	Single stage centrifugal P/P	Able to handle medium pressure high flow & low discharge head.
04	Noxious Chemical Cargo Discharge	Multistage centrifugal pump	High pressure & high discharge head
05	Oil Cargo Stripping	Multistage centrifugal pump	High pressure & high discharge head