At an oil refinery, a mobile centrifugal pump is used to pump warm crude oil from a storage tank. Liquid level in tank at elevation of 3 metres above pump. Suction side of pump is fed with a flexible hose that is 10 metres long.(adsbygoogle = window.adsbygoogle || []).push({});

Crude oil density: 846 kg/m3

Crude flow 4000 kg/h

Internal diameter of flexible hose: 50mm

Vapor Pressure of crude oil: 0.0654 bar (a)

Friction head in suction line: 1.2 m

NPSA Available = [P(atm) - Pv] / [density * grav] + hs - hf

Velocity Head: H(v) = u^2/2g

[where u = Q/pi*r^2]

I have plugged in my values into the two above equations to find out NPSHa and Velocity head.

However, the 10m value that is mentioned for the flexible hose i did not plug in.Does this 10m value need to be used in the solution or is it just for the purpose of a sketch?

My solution is attached, any help will be kindly appreciated.

Thanks,

Mojo

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# Npsh problem

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