Negative Loop Test

Uwe Sieg

Uwe Sieg

UweS
On my last dive weekend I was unable to get my RB into the water due to my negative test failing.

Tracing a Positive leak is possible by utilizing a soapy spray and observing for bubbles.

What steps are recommended to quickly trace a negative loop test failure?
 
Use whatever loop caps and bungs you can to break it down into sections. On the Inspo, for example, one of the head loop hoses will actually thread to both t-pieces, cutting out the canister. Use caps or bugs in the t-pieces to isolate the lungs. Things like that.

If it's a strong fail, you might have better luck with soapy water and blowing a positive, it will often fail both.

Jim
 
Thank you very much for your reply. I did manage to isolate the ADV as the source of the loop intrusion and solved the loop integrity problem.
 
you guys jinxed me. could not hold a positive, finally found a small leak under the ring clamp on the rubber hose comming from the bov.
 
Little late to this party BUT here goes anyway. It can be extremely difficult to find a neg failure if it is rather small. I found the best way was to insert pieces of paper towel all through put the unit, pull a healthy negative, and submerge it for several minutes. The wet paper towel will eventually lead to exactly to the leak. It might take a couple of runs to get there, but it will pinpoint it.
 
DSix36 said:
Little late to this party BUT here goes anyway. It can be extremely difficult to find a neg failure if it is rather small. I found the best way was to insert pieces of paper towel all through put the unit, pull a healthy negative, and submerge it for several minutes. The wet paper towel will eventually lead to exactly to the leak. It might take a couple of runs to get there, but it will pinpoint it.
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Nice, now if I can find the failed negative in my drysuit that only shows up if I dive for over an hour.
 
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