What is mean by NPSH? why NPSH available should be more than
NPSH required for pump?
- 2 Answers
- 5840 Views
- Lupin, I also Faced
- E-Mail Answers
Answer Posted / vinay mishra
Every pump ie designed on certain temp. of liq. further at
certain vapour pressure of liquid . if pressure at suction
line of pump becomes low means pressure reduce below vapour
pressure then cavity or coalapse of bubble will occour on
eye of impellor this phenomenon is called as cavitation ,
if their will cavitation in pump following event occour
1. it can harm the vanes of impellor
2. viberation or noise can reduce bearing or seal life
3. it reduce the pump performance
so to avoid above event the pressure will be alaways
exceeds some value above vapour pressur in the suction line
of pump , npsh is a characteristic of pump design
so NPSH is define as difference of net suction head and
head due to vapour preessure.
so NPSH is alaways greater than NPSHR
| Is This Answer Correct ? | 7 Yes | 0 No |
Post New Answer View All Answers
What is booster in pneumatic ?
Sir i am appearing for the section engineer post examination of railway recruitment board.Can you please send me the previous question papers from 2001 to till date.
what is the magnetic (electric) center)
what is compression ratio? why its decreased when gear shifted ?
How are the pneumatic system and the hydraulic system similar?
can i use IS 2062 gr B pipes in the softening plant pipings?
Is there a high demand for mechanical engineers right now?
Name the common carpentry tools?
What happen when too much cylinder oil is injected in the working cylinder?
Why did you choose this career?
what is the job responsilties of Sr. engineer in QA/QC deptt.
What for schmidt plot for is used in heat transfer problems ?
what is the difference between impact force and sudden force? pls give any example.
sir,i am golng to attend BHEL supervisor trainee personal interview on 11 sept.anyone share me that how could i perform well in interview& what they would expect from me. thank you.
what are the parameters are selected while manufacturing a single cylinder block?what are the different kind of test is conducted on it so that it can withstand with all those condition which required to run the engine efficiently.which force is act when piston slide inside the cylinder.
