In article , Scorsi says...

Hello, I have just bought a Welch 1402 second hand which I want to use
to degas silicone and urethane/resin.

1) Where do you put the oil? (crazy question I know)

In the exhaust port.

2) what oil is acceptable to use I have some Robinair direct drive oil
and in a thread I researched somebody mentioned curt lesker and
company Tv-019 I want as good a vacuum as I can get without recking
the pump, but I am not sure I want to pay Welch Duo seal oil prices.

Check the vapor pressure of teh oil you have, if it is for
direct drive vacuum pumps it should work fine. I run the
Leybold direct drive oil in belt driven pumps and it works
fine. The belt drive ones run at a lower speed so if the
oil will stand up to direct drives it will work in a welch
pump.


3) The inlet and outlet ports do not have barbs screwed in does
anybody know of a source for 13/16th 20thread/in barbs (that dont cost
welch prices -60 bucks a piece)

That's a toughie. If you cannot find one from a surplus pump
place, you could thread a piece of brass tubing (there *may*
be an NPT size that is close in OD) to be 20 tpi and then seal
with something like epoxy.

Jim

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