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It's been a long while since I posted here, but wanted your input on a bit of a brain-buster :)
Looking to recirculate water through a dephlegmator, rather than use a constant mains water stream.
We're operating on a commercial scale here, so the liquid is stored in a 1000L IBC container, and is a glycol mixture.
My thoughts are to use a bilge pump (self-priming, 'silent' operation, anti-spark, long-life), submerged in the glycol mixture, pumping through the dephleg (and condenser), with a return-line back through the top of the IBC.
My only issue with this is being able to turn the pump off, and on again if I wish to shut the flow to the dephlegmator (in the case of controlling vapour running through it). In control systems that operate with solenoids, the flow is either off and on. I would love not to have the pump running whilst the flow isn't open.
I was thinking along the lines of a garden pump, which shuts itself off when the flow turns off, and starts up, when flow is open. Or even pump systems that are attached to houses hooked up to rainwater.
What do you guys use?