Originally Posted by annul
So I'm having an issue that I'm hoping someone can help me with. I'm leak-testing my loop using the Dr. Drop and I'm having a slow leak of about 0.2 psi per hour over a 12 hour period. So far, I've tried everything I can think of, including applying a soap and water solution around the fittings to catch any bubbles and making sure all the fittings are tightened down properly. Nothing has been successful so I'm wondering if I'm missing something. I also tested the Dr. Drop pressure tester by itself and it doesn't leak.
I don't feel confident filling the loop with liquid just yet. Is this too much of an air pressure drop where the loop will start leaking when filled with liquid?
It would be good to post your water cooling parts and what exactly you are water cooling ie cpu, gpu etc...
Anyway to comment on your question 0.2psi = approx 0.01 bar every hour over a period of 12 hours.
How did you test the Dr. drop unit it self?
Are you using hard tubing or soft tubing?
Does your room change temps depending on the period (night is cooler day time is warmer this can result in pressure changes but these are slight). Also if you use soft tubing this also may result in pressure difference.
In any case i would test cpu + gpu only and let it sit for 1 hour or 2 if you use soft tubing it may lose pressure of about 0.01bar which if memory recalls is normal and should stay fixed after the very slight pressure drop even after 2 hours. If there is a higher drop in pressure then there is a small leak.
I would test the radiator individually make SURE it can handle approx 0.55 bar! And let it sit for 1 or 2 hours there should be NO pressure drop since your not using tubing (if its soft tubing)
Test the pump-res combo also individually.
If all above shown no leaks outside of the error margin then LOOK at your fittings if you use ROTARY fittings wiggle gently them a bit to see if that is the cause of your leaks.
Or place soapy water solution on all suspect water cooling parts pump the unit to 0.55bar then slowly release the air with valve on your Dr. drop unit and watch for leaks....
If you just pump to 0.5 bar and let it sit there it can be very hard to spot leaks that way even when you applied soapy water. So best is to apply soapy water and release pressure slowly (or in one go fast) and watch for leaks keep repeating this on all fittings, blocks, pump-res, radiator. It goes 2 ways release pressure and spot for leaks OR when your dr. drop has reached almost 0 bar then PUMP again and WATCH for leaks (bubbles) WHILE pumping.
To make it easier for you attach the Dr.drop on a 30cm to 40cm soft tubing (just for testing to look for leaks)
PS pressure test for 1 hour to 2 hours is all you need.
Hope this helps