Significance of Pump Shut Off Head
Significance of Pump Shut Off Head
(OP)
What is the significance of Pump Shut of Head in terms of pump operation and mainteance, piping system, valves design, and other pump station design parameters?
Thanks in advance for your input.
Thanks in advance for your input.





RE: Significance of Pump Shut Off Head
Johnny Pellin
RE: Significance of Pump Shut Off Head
RE: Significance of Pump Shut Off Head
Independent events are seldomly independent.
RE: Significance of Pump Shut Off Head
From a pump operation point of view, in municipal water treatment plants and pumping stations we always start the pump up against a 95-100% completely closed valve and then slowly fully open it up. This allows the water to be pumped into a distribution system slowly at first. This protects the distribution system from sudden surges. On pump de-energization, the discharge valve is slowly closed to 95% closed and the pump is then de-energized. The valve continues to 100% closed. This again prevents surging and water hammer in the distribution system
The shut in head is the maximum pressure your motorized discharge valve operator has to be able to overcome and the motorized valve operator manufacturer needs to know this. The same goes for the valve itself
RE: Significance of Pump Shut Off Head
Your question is not clear. What are you wanting to do or needing to do?
Johnny Pellin
RE: Significance of Pump Shut Off Head
I think all replies answered my questions.
RE: Significance of Pump Shut Off Head
RE: Significance of Pump Shut Off Head
A lot of the heat will get dissapated to the surrounding piping which is full of "cooler water" so that buy you some float time
RE: Significance of Pump Shut Off Head
Also, maximum shaft deflection is at CV, it is also inadvisable to run any high energy pump too far left on its performance curve at any time for obvious reasons.
It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)
RE: Significance of Pump Shut Off Head
http://www.eng-tips.com/viewthread.cfm?qid=321456
Regards,
Lyle
RE: Significance of Pump Shut Off Head
There is a clear distinction between centrifugal and axial pumps, most of the concepts expressed here refer to centrifugal pumps. Just one comment: shut-off head IS NOT the shut off pressure, the shut off pressure is the result of adding the head converted to pressure (divide head by specific weight of fluid) plus (or minus) static head also converted plus hydraulic pressure + any dynamic (transient) effects caused by the operation (water hammer, cavitation, flashing, etc).
what is important to know is that the oem provides data for their pump ONLY, the user must integrate the pump data into the system under consideration
saludos.
a.
RE: Significance of Pump Shut Off Head
RE: Significance of Pump Shut Off Head
RE: Significance of Pump Shut Off Head
Check out the below websites:-
www.mcnallyinstitute.com
www.pump-zone.com
www.pumpfundamentals.com/pump_glossary.htm#gl441
www.pumpsystemsmatter.org/
“The beautiful thing about learning is that no one can take it away from you.”
---B.B. King
http://waterhammer.hopout.com.au/
RE: Significance of Pump Shut Off Head