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Evacuated Tube Copper Pipe Seized in Collector
I have a roof mounted evacuated tube water heating system. I need to temporarily disassemble the system (roofing problems that need to be fixed). Many copper pipes (the pipes inside the evacuated tubes) are stuck in the collector and I can't pull them out. Anybody has experienced this before? Any tips or trick to disassemble them? Any help is appreciated.
Here's what I've tried up to now:
1)WD-40: sometimes helped, but won't free the hard cases, which are many;
2)Working at sundawn, with the system completely cold: does help, but again won't free the hard cases;
3)Working with hot tubes: doesn't help at all AND very inconvenient (very high copper tube temperature) AND maybe safety issues;
4)pushing the pipe further in, then pulling out: does help;
5) Brute force: I have applied limited force in order not to damage the collector. As it's still mounted on my roof and I haven't removed the covers on the collector to confirm its construction, I'm playing it safe and have only applied the force one could apply without the help of tooling (otherwise said: hand force).
I'm thinking of trying penetrating oil, but I'm a bit help back by the potential fire hazard.
I'm thinking of finding something I could use to dissolve the old thermal paste, however this IMHO will be a last resort, as I doubt it would work and the product that COULD work is hard stuff for many plastics (e.g. acetone...)