High Pressure Piston Pump

[PeterKSanders]

Hello, I have a high pressure piston pump that will run LNG at 310 barg and -150°C with an inlet pressure of 7 barg. I was told that at slow speeds it would cavitate. I don't see why slow speeds would cause cavitation as slowing a normal pump down is one of the ways we solve cavitation in other pumps. Any insight would be greatly appreciated.

 

[Compositepro]

Heat leakage through the insulation becomes a problem causing boiling of the LNG at lower flow rates.

 

[georgeverghese]

In general, piston pumps have high acceleration head requirements and depend on good pulsation suppression on the suction (and discharge) side to work well.
I would selecting a good triplex (at least) plunger for LNG if it is operating close to bubble point. Minimise dependence on pulsation attenuation with pulsation dampeners.

 

[LittleInch]

Doesn't seem right but would need more information. Also you need to go back to the source of this information and challenge them to explain

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.