NPSH | CAVITATION | PUMPS | FLUID | VAPOUR LOCKING | PLACEMENTS | INTERVIEWS | EXAMINATIONS

#NPSH #CAVITATION #PLACEMENTS #EXAMINATIONS #INTERVIEWS #PUMPS #FLUID_MECHANICS #Engineering #lifebeyondbusiness

#Summary_and_Highlights


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Have you ever wondered:

In a Multi Storey Building, the Pump is always kept closer to the Reservoir. WHY?

No. of Fittings, Valves and Bends in the Suction Line are always maintained as low as possible. WHY?

Suction line is always of a Higher Diameter. WHY?

Well, Here is the #Answer:

Pressure Energy Loss of the Fluid occurs due to passage through multiple Fittings, Valves and Bends in the Suction line and Rising against Gravitational Pull.

More are these Pressure losses, the lesser is the pressure at the entry of the Centrifugal Pump causing the easy formation of vapours at a relatively low pressure zone created inside the Pump. This leads to Vapour Locking causing Shock waves also known as the problem of CAVITATION.

To prevent the easy formation of vapours the pressure at the entry of the Centrifugal Pump must be kept much higher than the corresponding Vapour Pressure at that Temperature. This is possible by maintaining a high NPSH.

NPSH can be made high by reducing the pressure losses against Gravity and Friction by maintaining:

1. Less distance between Pump and Reservoir✔
2. Less no. of Fittings, Valves and Bends in the Suction Line✔
3. Higher Diameter of Suction Line✔

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This lecture is delivered by Soumajit Chail
(B.E. Chemical Engineering Jadavpur University Batch 2019 Pass Out)

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