Update on experiment

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steventw
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Update on experiment

Post by steventw » Wed Jan 22, 2020 7:11 am

Hey

Just an updated on how I’m doing with experiment
Got down to 2812 micron with just pump
Friend at work as a vacuum pump so hopen to try double up.
Pump he has is better than cheap chines one I’m usen.

But slowly getting there
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Richard Hull
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Re: Update on experiment

Post by Richard Hull » Wed Jan 22, 2020 7:39 am

You do have a nice gauge, at least. You also have either the worst pump in the world or the most number of leaks, real or virtual, that I might imagine.
Progress may have been a good thing once, but it just went on too long. - Yogi Berra
Fusion is the energy of the future....and it always will be
Retired now...Doing only what I want and not what I should...every day is a saturday.

steventw
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Re: Update on experiment

Post by steventw » Wed Jan 22, 2020 7:54 am

I do Probly need a new plastic rim
Cause is a bit dodgy after didn’t put lid on right and lid got sucked in and ripped plastic seal in some places

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Re: Update on experiment

Post by ian_krase » Fri Jan 24, 2020 7:56 am

Vacuum seals must be nearly perfect.

While compressible rubber seals such as O-rings with vacuum grease can cover many ills, they are still sharply limited. It only takes a small pinhole to make a vacuum unusable. Threaded pipe fittings, hairline cracks and pinholes, and a variety of other problems can also be an issue.

steventw
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Re: Update on experiment

Post by steventw » Thu Jan 30, 2020 3:27 am

Just got a new seal for lid
Will see how it gos when get a chance to run another test

Will check fittings ect aswell

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Rich Feldman
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Re: Update on experiment

Post by Rich Feldman » Thu Jan 30, 2020 4:02 pm

Good luck with that, Steven.

As Richard said, your very high ultimate pressure indicates that there's at least one major vacuum leak. It's happened to me. Have you tried listening closely to locate the leak?

Another way to measure the leak is to turn off the vacuum pump and see how fast the chamber pressure returns to atmosphere.
Some pump defects can let pump oil be sucked into the evacuated chamber when motor stops.
If that happens in your case, you can valve off the pump instead of turning off the motor.

Here is an effective but messy method for gross leak detection.
Brush some oil or grease or petroleum jelly around the outside of each seal, while chamber is pumped down.
Watch through your large clear lid, to see where the oil & maybe tiny bubbles are being sucked in.
Watch the vacuum gauge in case pressure drops when the leak is momentarily plugged with oil.
Don't overlook the joints in pipe between pump and chamber.
All models are wrong; some models are useful. -- George Box

steventw
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Re: Update on experiment

Post by steventw » Thu Jan 30, 2020 9:42 pm

Thanks for advice

I’ll give it a go next time am at work in workshop

steventw
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Re: Update on experiment

Post by steventw » Sat Mar 14, 2020 12:16 am

Hey

Update with how been going
Last few tests only been getting to around 4.9000 mbar
Guess still some leaks
Probly need to wash seal to get any dust off

Anyway attached some pics
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5A6168BD-2919-4147-BC4B-B7016BFEAD6E.jpeg
F5F0072A-EEDB-4C5A-90BF-1CF550855629.jpeg

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Rich Feldman
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Re: Update on experiment

Post by Rich Feldman » Sat Mar 14, 2020 12:47 am

Very nice pictures, Steven.

What if your leak is not from a dirty seal, but some place completely different from the seal you are thinking of?
Like an electrical feedthrough, or a vacuum hose connection, or you just have a defective vacuum pump?
Would be nice if you could close a valve between pump and chamber.
All models are wrong; some models are useful. -- George Box

steventw
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Re: Update on experiment

Post by steventw » Sat Mar 14, 2020 2:11 am

Hey

Attached picture of setup
7FA9C87C-9A61-492B-84D3-931117142F38.jpeg
Basically just a big pot with Perspex lid with rubber seal

Pump is rated to 3x 10-1 pa
Not sure what that means

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