Diaphragm pump that can handle -80°C

[Soxhlet]

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Cold ethanol pumps

Hello I was curious what kind of pumps everyone’s using to transfer cold ethanol (-40C) to and from vessels. Trying to source one rated and approved for the job has been difficult. It seems this is a very specific application not commonly found in most industries. Currently using an air operated diaphragm pump. It does the job but it starts to slow after a few minutes of operation plus I don’t like the pulsating flow. Would like to switch to gear pumps or something else better suited for th…

Diaphragm pumps dont like to work at really low temps, really you are limited by the material of the diaphragm. @cyclopath had been down this road for pumps, here were his choices.