Pacific school of Engineering , surat. A Presentation on. Cenrifugal pump. Guided by. MR Vatsal Patel. Prepared by:. 1} Jogani Ghanshyam (131120131020) 2 } Italiya Pratik (1311201319) 3 } Kabariya Shubham ( 1311201321). CENTRIFUGAL PUMP.
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Pacific school of
Engineering , surat
MR Vatsal Patel
1} JoganiGhanshyam (131120131020)
2} ItaliyaPratik (1311201319)
-: Working of Centrifugal Pump :-
:Priming of a Centrifugal Pump :
:- In case the priming of pump is not done and the pump is not done and the pump is not under the operation, the water present in the pump and suction pipe will flow back to the sump. The space occupied by water will be filled by air.
:-The operation of filling the casing , impeller and suction pipe and the portion of delivery pump upto delivery valve is called priming.
:- If the pump is now started, the air pockets inside the impeller may give rise to vortices and cause the discontinuity of flow. Under these condition, the flow of fluid does not commence and the pump runs dry. It causes the rubbing and seizing of the wearing rings, increases noise level and vibrations and finally may cause the serious damage to pump.
:- The priming in resiprocating pumps is not required since the pumping is done by positively moving the fluid out of the cylinder by the piston. Hence, the air will be displaced from the casing when the pump starts and it will get a suction pressure which will draw the fluid from the sump.
1. Stationary componets, casing, casing cover and bearings
2. Rotating components, impeller and shaft
Liquid flow path inside a centrifugal pump
Where m=mass flow rate, kg/s
H= total discharge head, N.m/kg
nqis the specific speed for a unit machine that is geometric similar to a machine with the head Hq = 1 m and flow rate Q = 1 m3/s
Three basic components:
Single suction impeller
Vr = Radial Velocity
Vt = Tangential Velocity
Vs = Vector Sum Velocity
Arrows represent the
direction of water flow
Bell & Gossett
Typical Split Case Pump- Section View
1.Pipe weight hangs on pump flange.
2. Short suction pipe results in uneven impeller loading.
1. Pipe supported
2.Length of suction piping allows even impeller loading