Edited by GMU, 27 March 2014 - 07:15 PM.
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Vibration In Centrifugal Pump Discharge Line
#1
Posted 27 March 2014 - 07:10 PM
#2
Posted 27 March 2014 - 10:24 PM
Very difficult to follow. Drawing a flow diagram may help to understand your problem
#3
Posted 28 March 2014 - 07:02 AM
I guess that when you are pumping to the distant tank at 500 m3/h the delivery pressure on the pump will be around 15 barg, mainly due to the high static head. When you are pumping to the closer tank you need to dissipate all this pressure over your collection of orifices and valves. This could be resulting in cavitation in the orifices and/or valves and some very high local velocities. You should try to get the design calculations for the orifices and valves in the short line - I expect the problem is in there.
#4
Posted 01 April 2014 - 12:41 AM
Hi GMU,
There are several possibilities for the vibration in the above situation. The things can be checked
1. Pipe sizes for 300 m3/h and 500 m3/h ( it seems the mentioned sizes are OK).
2. Restriction Orifices size, thickness and their respective DP ( But its required to check if the 8" line is on flow. You refereed that vibration happening when this
line is closed)
3. Stress analysis and sufficient pipe supports.
4. Recommended Operating pressure for the pump (see vendor's document for performance curves) and shut off pressure.
5. Pressure relief valve and/or VFD and/or VSD can be considered on the discharge line to have the desired operating condition.
6. Must be sure about cavitation.
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