Today, I had to bend an a/c pipe on a tractor. It ended up fitting the way it should, but it seems I've made a pressure mark in it. The wall thickness of this pipe is about 0.04'', so this mark is likely a very weak point now. The pipe I am dealing with is the one between the compressor and the condenser. Just to get an impression of the stress on this pipe: What is the maximum working pressure of an a/c?