It’s not on same ball park. The 2021 I can do them for like 1500 prob. Rebuilt. Don’t quote me exact price. I’d have to have sales get your Addy and info for shipping and all. For spd it’s prob a bare min. The best option for a 2-5l sod is actually a e2m28/30 style pump. I have seen the most life and bang for your buck with that.
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Curious about the best Edwards pump for a 20/22l SPD? Will a single E2M80 do a proper job? Could an E2M28 be used in addition as roughing pump?
What would be the best way taking down kf40 to kf25 without cutting CFM too much?
You won’t cut cfm unless it’s free blasting atmosphere. A Kf25 offers more cfm at vacuum than a 22l spd can actually give off with cfm at vacuum.
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I fucking love how you casually drop these bits of knowledge
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I don’t know how you get these things wrong it’s actually pretty simple. If the pump has a larger size port and you reduce it you are restricting the system conductance and available cfm. A system with greater conductance will pull deeper vacuum at higher cfm.
Oh I disagreed with him. Count down SPDking insult in 3…2…1
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Only if the pump at vacuum has more to pull than avail. You are limited by bottle necks. When in volatile stages it can matter. When distilling. It’s not super harsh going from kf40 to kf25 on a 22liter
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I did ask last week… " has anyone ever used an aspirator with a pressure washer ? " I didn’t get a response haha 
Someone should compile a table of suitable pumps, from low to high price.
I would do it but i dont have the knowledge to do so…
To inspire inspiration I will make a start haha.
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Would it makes sense to use an E2M28 as a roughing pump in combination with an E2M80? If not, what kind of pump would be recommeded as roughing pump?
Also would it be advisable to add an Edwards EH1200 booster pump to a E2M80 for a 22l SPD or not neccesary?
The 80 is enough. The EH 1200+ E2m80 is good for like 5x 20L setups.
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So for distilling you want a mag drive with a reloop bypass built into the booster or you’ll blow seals on the pump below it. I think there are cheaper and better options, but trully the ones with mag/bypass are best suited. If the atmosphere changes dramatically you can use the booster in a free spin mode and it won’t over load.
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what the hell does that mean?
you choose your pump according to its weight and dimensions? not according to its cfm, hp, ultimate vacuum…. ??? ??? ??? ??? ??? ??? ??? ??? ??? ???