Pump Type for Low Temp Alcohols

[ME27272727]

I have an application where I'll be pumping ethanol at -75°F. I was originally thinking of going with air operated 316 stainless steel diaphragm pumps, but I'm running out of options once I hit -40°F, I believe due to the plastic / rubber diaphragms and seals. Can someone maybe recommend a better solution for this type of fluid? Thanks.

 

[jari001]

I searched "ultra low temperature liquid pump" and got this potential lead:

https://www.starpumpalliance.com/re...trial-pumps-for-low-temperature-applications/

If you post more details on the pumping duty, others can give better advice.

 

[georgeverghese]

The M500 metal diaphragm pump model on this Lewa pump range goes down to -58degF only - talk to them to see if they can extend this down to -75degF.

https://www.lewa.de/fileadmin/0_dow...formation/D1-600_LEWA_Process-pumps_en_us.pdf

 

[ME27272727]

Thank you for your responses, I'll look into these options.

One more question on the matter. Air diaphragm pumps are positive displacement, and positive displacement pumps typically require pressure relief. In the installed systems I've observed, I didn't see pressure relief installed. Is it possible to perhaps limit this through the air side of the pump?

Thanks again.