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Leakshield: How to find a leak that isn't leaking liquid?

Ytterbium

Full Member

Leakshield: How to find a leak that isn't leaking liquid?

Wednesday, June 8th 2022, 11:48pm

Today I seem to have developed a leak but I see no liquid coming out when pressure is released, it can easily pull 350 mbar in the test but the air leaks in quickly like 20 mbar/min. up till now it was doing about 4 secs per day.

but I see no evidence of liquid, looking in the res I see that I lost maybe. 3 ml in 10 days.

Other than breaking down the whole system and rebuilding, which could make more leaks, I'm a little at a loss what to do?

Ytterbium

Full Member

Thursday, June 9th 2022, 8:20am

Seem like it could be an air leak, it back to 0.03 mbar/min after tightening the leakshield, not sure how it got loose to start with.

Speedy-VI

Senior Member

Thursday, June 9th 2022, 7:09pm

Check the gaskets for the res and Leak Shield. There have been several posts here about leaks that turned out to be either an improperly seated gasket or a missing gasket. IIRC, missing a gasket causes pressure to drop immediately. If you have rotary fittings in the loop, I would check those too.

This post has been edited 1 times, last edit by "Speedy-VI" (Jun 11th 2022, 6:39pm)

knacker

Full Member

Saturday, June 11th 2022, 11:26am

Rotary fittings are number one suspect as my hardline loop displays the same thng and I have had to put in a few rotary and adaptors as still waiting on some tubing to come in stock

Ytterbium

Full Member

Saturday, June 11th 2022, 11:55am

Seems like it the res gasket, I tightened it so much. It will leak 0.03 mbar/min when its working, then its a few sec per day of pumping. I'll try swapping it for another one.

Remayz

Senior Member

Saturday, June 11th 2022, 12:09pm

you don't want to go in dry :p

always wet the gasket before tightening the res. Actualy; the same goes for fittings. Often you think it's tight but it's just the dry o-ring adhering and stopping you from tightening further.

Ytterbium

Full Member

Monday, June 13th 2022, 5:52pm

It off again, I tightened it so much, I'm not sure how to get it off this time.


Ytterbium

Full Member

Thursday, June 23rd 2022, 9:14pm

I got a strap wrench so I could get it off I lubed it and put it back, still can not get to low leak rate, seems like something is broken. New seal should be here soon.

Caldorian

Junior Member

Friday, June 24th 2022, 12:08am

When you're talking about a gasket; which gasket are you talking about? As well, what would a normal "leak" rate with the leakshield be? I did a leak test with just the Ultitube D5 Next + Leakshield (ports plugged), and was still seeing around a 0.2mbar/min leak when I first built my new system over the weekend.

Ytterbium

Full Member

Friday, June 24th 2022, 7:31am

The large one at the top between the leakshield and the res. In the past I could get 0.03 mbar/min, the people at Aquacomputer said there's pumps every 2-3 day.

I think testing with air it would be higher as the expected conditions are with only 100 ml of air with the rest DP ultra, so it sounds like you will be fine.

My air tests were not more than 1 mbar in 15min as I was building the loop.

This post has been edited 1 times, last edit by "Ytterbium" (Jun 25th 2022, 1:02pm)

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