EKG CH 1.1 Q 1 (a) Name various types of pumps generally used on board ships. (b) Draw a vertical, single inlet centrifugal pump & write different parts of it.

EKG Chapter 1.1

1.(a) Name various types of pumps generally used on board ships. (4)  

(b) Draw a vertical, single inlet centrifugal pump & write different parts of it. (6)  

Ans (a): Various types of pumps generally used on board ship: 

The pumps used onboard ship are broadly classified into two types.  

1. Positive displacement Pump.  

2. Dynamic pressure pump/centrifugal pump. 

1. Positive displacement pumps are: 

Reciprocating pump  

Screw pump  

Gear Pump  

Ram type pump  

Vane pump

Piston pump

Plunger pump

2. Dynamic Pressure Pumps are: 

Centrifugal pump

Axial flow pump

Submersible pump

Centrifugal-axial (mixed) pump

Ans (b): vertical, single inlet centrifugal pump:

Fig: Vertical, single inlet centrifugal pump

Different parts of vertical, single inlet centrifugal pump:  

Impeller: Impeller is a rotor used to increase the kinetic energy of the flow.  

Casing (Volute): The casing contains the liquid and acts as a pressure containment vessel that directs the flow of liquid in and out of the centrifugal pump.  

Shaft (Rotor): The impeller is mounted on a shaft. Shaft is a mechanical component for transmitting torque from the motor to the impeller.  

Shaft sealing: Centrifugal pumps are provided with packing rings or mechanical seal which helps to prevent the leakage of the pumped liquid.

Bearings: Bearings reduce friction between the rotating shaft and the stator. 

Etc.