Diaphragm metering pump suction pressure
Diaphragm metering pump suction pressure
(OP)
We have a metering (diaphragm) type pump with design suction pressure 4.5 barg, discharge pressure 42 barg, flow rate 8 LPM. What may be the possible adverse effects on pump, its performance if suction pressure goes abnormally high for eg. say 40 barg?





RE: Diaphragm metering pump suction pressure
Check the pump's pressure rating.
RE: Diaphragm metering pump suction pressure
If the suction pressure rises to 40 bar and the discharge pressure is relieved back to the suction, you are not protected if the suction pressure rises. You need the relief valve to discharge elsewhere. And yes, you should have relief on the discharge PIPING of any PD pump which is capable of a pressure at dead-head which can damage the piping or downstream equipment.
If it is a hydraulic diaphragm pump, the internal hydraulic relief that such pumps usually have, is referenced to atmosphere rather than to suction pressure. If it is set properly, once the hydraulic relief pressure is reached, the pump will simply stop pumping hydraulic oil to the diaphragm and the diaphragm will cease to move. However, you should NOT rely on that internal hydraulic relief to protect anything other than the pump itself.
The pump itself is unlikely to be damaged, but that depends on design and you need to verify that with the manufacturer.
RE: Diaphragm metering pump suction pressure
RE: Diaphragm metering pump suction pressure
RE: Diaphragm metering pump suction pressure
RE: Diaphragm metering pump suction pressure
RE: Diaphragm metering pump suction pressure
Last but not least you must check with the manufacturer if there is any negative effect for the gear. Will it get sufficient lubrication for all parts during an entire revolution?
RE: Diaphragm metering pump suction pressure
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RE: Diaphragm metering pump suction pressure
RE: Diaphragm metering pump suction pressure
RE: Diaphragm metering pump suction pressure
RE: Diaphragm metering pump suction pressure
Some of the Lewa pumps are good to 400 bar suction pressure.
RE: Diaphragm metering pump suction pressure
RE: Diaphragm metering pump suction pressure