Has anyone tried bubbling their pump exhaust through a water and powdered charcoal (not activated) solution to absorb the stink? would the back pressure be an issue? Removing the terpenes prior to SPD is probably the best solution though and i plan to try it soon.
We had an ventilation system set up as a fume extractor, ran it through an inline carbon filter for growing and discharge outside. We had ventilation pickups that we bent down to the exhausts on the pumps. You could probably rig one with dryer tubing. The filters would last a few weeks, then we would swap them out. If you choose that method be sure to grab 20 or so at a time from Alibaba. Way cheaper than going to the hydro shop.
Your exhaust should never be adultered. The vacuum system seals are meant for vacuum and can barely handle 1-2psi. Otherwise that’s how you make case pinhole leaks that will make vacuum pumps pull less vacuum or even leak oil everywhere.
In commercial setting the way they accomplish this is coverase vacuum segmented exhaust.
The way this works is prior to any pumps being switched on. There is kf plumbing that runs the length of the pump arrays along the wall. It is usually connected to a 60-120 gallon style steel tank with drains. On the other side there is a exhaust fan that goes into its own filtration canister.
The back end of vacuum pumps should be exposed to atmosphere or go through its own “suction” style system. And at no time can there be forward gasses backed up. It must be carried past a accumulated surface area and out a exhaust fan that controls that suction at all times.
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“Hey I heard you like vacuum pumps so i got you a vacuum pump to pump down your vacuum pump”
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Would you believe me if I told you that was actually a thing…
It’s called degassing enroute.
It’s actually used to evacuate all vacuum pumps of contamination. That’s why there’s a drain in the accumulator.
I have never shared my oil boil out info or pump oil mantle breakdown testing and degassing.
You would be blown away if you put a scroll pump on the back end of a Edwards and seen what happens during your process.
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Now I really want to try this on my Alcatel 2063, what will happen if I back the rotary vane with a scroll pump?
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It sounds like consensus is do not restrict the flow from the pumps exhaust but instead pipe the gasses through a carbon filter. I have some small pieces of charcoal filter designed for an air purifier but would hardwood charcoal in a bucket work in a pinch?
Would that not increase the depth of vacuum by allowing the edwards to operate without contamination, thereby lowing boiling points and allowing for better separation. I thought scroll pumps generally pull less vacuum than a 2 stage rotary vane, would a diffusion or turbo pump degas even better?
No those are meant to run on dry vacuum. They would soak and stop working or damage in the case of a turbo. And yes bingo. The pump opperates a bit differently. Essentially you are adding a third stage to a two stage pump. And your oil last considerably longer from moisture degredation.
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You can add a dry ice cold trap after the pump as long as you wait until after the initial pump down and or use full bore. Should catch alot
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so the setup would be 2 stage pump → mist filter → baffling chamber with a drain ---->oilless degassing pump
so i would be catching mist along with all the contaminants correct?
Yep. Definitely put an oil mist eliminator in line before it but any residual would be caught