Calculate the net positive suction head, Mechanical Engineering

Assignment Help:

A pump station has been designed to lift water out of a 6 metre deep pit (vented to atmosphere) via a centrifigual pump mounted at ground level.

                   Liquid conditions                                     20 OC

                   Suction pipe work losses                        2.0 metres

                   NPSH safety factor                                5.0 kPa

                   Vapor pressure @ 20oC                         0.25 metres

Calculate the Net Positive Suction Head (NPSH available) for the system ?

In summer the liquid temperature rises to 60 oC, this changes the water vapor pressure to 2.05 metres. What is the revised NPSH available for the higher water temperature ?

Pressure loss in the suction pipe work is directly proportional to water veloicty in the pipe work squared, which is inversely proportional to suction pipe work diameter squared. For the NPSHavailable result from part (b) what increase in suction pipework size is required to have a positive NPSH available result as calculated in part (a).


Related Discussions:- Calculate the net positive suction head

Industrial manufacturing activity, Industrial Manufacturing Activity can br...

Industrial Manufacturing Activity can broadly be divided into the followings ways: Mass Production Large lots e, g, Automobiles : In this the volume of production is very hi

Determine the direction and magnitude of the work, Illustrate throttling pr...

Illustrate throttling process and free expansion process in details? A fluid is confined in a cylinder by a spring loaded frictionless piston so that pressure in the fluid is a

Determine the maximum permissible axial load, Determine the maximum permiss...

Determine the maximum permissible axial load: In an open coiled spring of 10 coils the stresses because of bending and twisting are 120 N/mm 2 and 150 N/mm 2 respectively wh

Electrical science, explain ways of representing alternative quantities;1)p...

explain ways of representing alternative quantities;1)phasor representation 2)graphical representation 3)complex waves 4)addition and subtraction of sine wave

Theory machines, Explain lower pair. and kinematics chair

Explain lower pair. and kinematics chair

Calculate the kic from the data - thick cylinder, Calculate the KIC from th...

Calculate the KIC from the data - thick cylinder: In a fracture test a 3-point bend specimen of thickness 20 mm and depth 25 mm is supported over a span of 100 mm. The specime

Define the disadvantages of abrasive jet cutting machines, Define the Disad...

Define the Disadvantages of Abrasive Jet Cutting Machines Slow material removal rate. Stray cutting and hence accuracy is not good. Abrasive powder cannot be reused

FEA, Consider the rocket on a test stand as described in Chapter 3 of the l...

Consider the rocket on a test stand as described in Chapter 3 of the lecture notes. The nose of the rocket is fixed. The rocket is of length L, constant EA and constant m, mass per

Forces working on sphere, Forces working on sphere: Let a sphere of ma...

Forces working on sphere: Let a sphere of mass m, suspended by means of a string, resting against a smooth wall, as illustrated in Figure (a). What are the forces working on i

Determine the change in pressure rise through the compressor, We have a rec...

We have a reciprocating compressor operating at 800 rpm.  Suction pressure and discharge pressure are held constant by other systems that have nothing to do with the compressor.  W

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd