Following return from visiting my relatives interstate, following the passing of my brother, I have been really flat and scatterbrained. Just as well I haven’t been at work as I am sure I would have made mistakes.
I have been pottering around at home, doing jobs that need doing but don’t matter too much if I get them wrong. Most of the week was spent installing a 5kW split aircon system, taking things particularly slowly and carefully. I still made mistakes, even stupid ones, but they were fixable.
The biggest stuff-up was kinking the gas line as I was running it up the wall
. All in all it took me about four hours to fix that problem. I had to get out the oxy-acetylene bottles and torch. I hadn’t actually fired up an oxy/acetylene torch for about 40 years, so I cut the wrapping off the two new bottles and connected everything up, set required pressures, checked for leaks (there was one initially) and fired it up. The first braze joint (using 15% silver solder) on the copper pipe was quite messy and possibly functional. Managed to not blow holes in anything or melt anything. This was only a test joint on some offcuts. The second attempt went a lot better and was much improved. After the two test joints it was time to braze the elbow onto where I had kinked the pipe. Kinked section was cut out, an elbow inserted and brazed in. The joints came out quite good. It doesn’t take much to impress me, but I was impressed
.
Next up was pressure testing. After making an adapter (Swagelok to Schrader) for my argon bottle, I pressurized the system and found there was a leak. Turned out to be a leak on the brass fitting on the gauge set I had borrowed from a friend
. Tightened it up and it held nicely for hours.
So I bled the pressure out and connected the vacuum pump up. It didn’t seem to be pulling down all the way but that turned out to be a vacuum gauge that hadn’t been zeroed properly. Re-zero and try again. It still wasn’t getting down all the way and I found some more fittings on the gauge set that were leaking
. Added Loctite and tightened. Holding vacuum nicely now.
As long as it hasn’t sagged by the time I get home tonight I will run the vac for another hour then seal off the system. Might even fire the system up tonight if all goes well.
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