April 2011
Beginner to intermediate
264 pages
8h 24m
English
Content preview from Practical Centrifugal Pumps
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Pump hydraulics 73
In addition to the margins specified in the table additional requirements of suction head
arise due to:
• Increase in wearing ring clearances due to wear. This increases the leakage
flow to the impeller eye and disturbs the inlet flow pattern
• Gas content in the liquid
• Improperly designed inlet piping and pump casing that cause non-uniform
suction flow or turbulence
• Operation of the pump on the farther right hand side of BEP. In this region, the
NPSH-a reduces and NPSH-r increases.
3.13 Suction specific speed
Suction Specific speed is defined by the equation;
ss
3/4
(NPSH-r)
NQ
N =
Where:
N = pump speed
Q = capacity ...
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