Welch CRV Pro8 + Welch Duoseal 1402 + Sogevac65 manifolded to a 12L SPD: Bad or ok idea?

Hash and Stuff Distillation
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1

I’m thinking sogevac for volatiles, and then the 2 welch pumps together for the main body. Think that’d work?

2

A 12 liter SPD is a mistake.

3

Not everyone is at a point where they can buy a wiped film! @QGA

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4

I’d just use 1 Welch, you can do dual pumps but it will not give you the performance that a diff pump will

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What is the advantage of having pumps manifolded for volatiles and main fractions. Would an adequate cold trap not be enough to keep the vacuum pump clean?

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Not necessarily for the lower boiling point volatiles… using the sv65 for volatiles then switch over to the Welch(s) so my Welch(s) don’t take such a beating. Those sogevacs are throw away pumps so you don’t trash your more expensive pumps.

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7

Are you worried about the two pumps pulling oil from one another of they aren’t perfectly matched in strength?

8

No I hadn’t considered that possibility in particular, but you’re correct in that my concern is problems arising from pumps manifolded together with different strengths.

9

sell the welch es get one good rated secondhand 40 cfm or more dual stage

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10

Yea this is kinda what my gut is telling me too.

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