Especially when you decide.. why not blow off your face with the nitrogen real quick and open the valve a little more :mad: Yeah the heat really got the best of me that day lol
Originally Posted by mgenius33
Too true. All the technical literature I read taught me to braze with nitrogen and then evacuate to at least 500 microns. The manufacturers of most pumps and gauge sets say the bigger the hoses and the less stuff in the lines i.e valve cores and valves and what not , the faster and more effective the evacuation. But all techs know about time constraints and the other factors that make exactly by the book impossible sometimes . The point about using a gauge set so one can just go ahead and weigh in the charge was a good offering of info as well
Originally Posted by Rcb2875
Nice experiment, I always wanted to try that but didn't have enough pipe and fittings around to do a good test. Thanks.
We all have our methods.
Mine is 60# and 180# psi to test.
I assume since there were no leaks before i worked on it, the leaks will be in my brazing/connections, so I do around 60# first to check with soap for bigger leaks then 180# and soap it up for 15 minutes. I do not depend on a fall of pressure to leak test unless it's overnight. A tiny pinhole leak may not show in such a short time on a gauge.
When in doubt, I use the H10.