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

Introduction to entrepreneurship development , INTRODUCTION: In the previo...

INTRODUCTION: In the previous unit, you studied about the motorcycle and its various parts and systems. In this unit, we shall learn the various aspects of Entrepreneurship Develo

What are preheat and interpass temperature, Q. What are Preheat and interpa...

Q. What are Preheat and interpass temperature? Preheat and interpass temperatures shall be in accordance with the applicable codes. Materials that require preheat for welding

Thermodynamics, Q2 A 3kW electric water heater is a cylindrical element hav...

Q2 A 3kW electric water heater is a cylindrical element having outside diameter 10mm. The heat transfer between the heater and the surrounding water is 980W/m2K. Determine the leng

Calculate the natural frequency, (a) Calculate the natural frequency of mas...

(a) Calculate the natural frequency of mass m = 1 Kg placed at one end of a cantilever beam of negligible mass. Length of cantilever = 500 mm, d = 30 mm, b = 20 mm, E = 210x10 9 N

Method of section, Figure shows a Warren girder consisting of seven members...

Figure shows a Warren girder consisting of seven members each of 3 m length freely supported at its end points. The girder is loaded at B and C as given. Determine the forces in al

Fatigue crack propagation, Fatigue crack propagation: If it is assumed...

Fatigue crack propagation: If it is assumed that no plastic deformation occurs around crack tip and law of fatigue crack propagation for place of above Example is da/dN =  10

Explain classification of welding processes, Classification Of Welding Proc...

Classification Of Welding Processes The classificated depending upon the nature of heat source and its movement resulting in spot, seam or zonal welds; or on the extent of heat

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