Turbopump Screen

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Tom McCarthy
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Turbopump Screen

Post by Tom McCarthy » Mon Mar 26, 2018 9:54 pm

I'm using a Leybold Turbovac 150, and was about to bolt it on today when I realised the inlet screen was loose and not parallel to the inlet flange. It was a bit forward from its usual position, which I thought was fixed.

I pushed on it and the screen went back to its normal position and won't move now. If the pump was shook quite a bit while upside down, it might slip forward, but be able to be pushed back into position as described.

I'm not sure if anything has changed, perhaps it has always been this way. I'd like to make sure it's okay before spinning it up though.

Tom

Jerry Biehler
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Re: Turbopump Screen

Post by Jerry Biehler » Tue Mar 27, 2018 1:41 am

A lot of screens are just a light press fit. Bouncing it around in shipping or handling can knock them loose.

Tom McCarthy
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Re: Turbopump Screen

Post by Tom McCarthy » Tue Mar 27, 2018 2:47 pm

Sounds good, thanks Jerry.

ian_krase
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Re: Turbopump Screen

Post by ian_krase » Wed Mar 28, 2018 3:58 am

Yeah, can confirm.


Varian turbos ship with a small plastic pick (I suspect it might be a rebadged dress shirt collar stay) to flip the screen out of the recess it fits into.

prestonbarrows
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Re: Turbopump Screen

Post by prestonbarrows » Sat May 19, 2018 3:28 am

Turbo inlet screens are typically just loosly retained by the conflat or ISO gasket on the inlet port. That is, they won't be positivly fixed until you install the pump on the mating flange. Then, they should be a bit loose, but not able to grossly fall out.

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