I need to cut and seal off a 1/4 copper pipe (that contains a gas) so that it's air tight. I bought a crimping tool and a cutter. I plan on heating the pipe, then using the crimping tool (which looks like vice grips) to pinch the pipe shut. Next, I will cut it, pinch the end closed, then solder the end. After that, I'll remove the crimping tool. I'd like to do this without letting any of the gas out, or ai in. Will heating the pipe before crimping it help the crimper to seal the pipe, or not? Any other tips that you can offer for this procedure?
Note: This is a hobby project, and the copper pipe contains acetone and a partial vacuum. It's going to be a thermal engine (basically a giant "drinking bird")
More Directions. First, I'm going to solder a valve onto the tube. Then I am going to suck out all of the air in the tube with a vacuum pump, and close the valve. Then I am going to open the valve to suck some acetone into the tube, closing the valve when needed. Then I am going to crimp the pipe, cut off the valve, solder the pipe closed and remove the crimping tool. It's important that I don't lose any of the acetone or vacuum during the final solder step. Also, acetone is flammable and I am using a torch. The crimp seal must be nearly perfect.