Mechanical Engineering - Hydraulic Machines - Discussion
Discussion Forum : Hydraulic Machines - Section 1 (Q.No. 35)
35.
When the speed of the pump increases, its net positive suction head (NPSH) requirement decreases.
Discussion:
7 comments Page 1 of 1.
Omar al nawaisheh said:
10 years ago
Why when the speed of the pump increases, its net positive suction head (NPSH) requirement decreases? Disagree.
Aru said:
10 years ago
What is the NPSH?
Pratik said:
9 years ago
NPSH (Net Positive Suction Head).
The minimum pressure required at the suction port of the pump to keep the pump from cavitation.
The minimum pressure required at the suction port of the pump to keep the pump from cavitation.
Pradip Nohwar said:
8 years ago
Is it because NPSH remains constant?
Bhuppi said:
8 years ago
The required NPSH increases monotonically while the NPSH actual decreases, and when these two meet, the cavitation starts.
NPSH(required) = (P + v * v/2)inlet - P(vapour)/density.
NPSH(required) = (P + v * v/2)inlet - P(vapour)/density.
Amr said:
7 years ago
Why?
Yash joshi said:
7 years ago
Power is directly proportional to speed. So more power products by pump for suction of low pressure liquid, when you increase speed. So not requirement of more npsh.
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