Originally Posted by Acushla
The copper needs to be in a fully annealed state. This may not be the case if they have been on the shelf for a long period of time. To anneal copper it has to be heated until colour change and quenched in cold water
. The annealed copper seals and all other mating surfaces must be spotlessly clean before fit up.
This goes contrary to what I was taught (and have successfully used for years).
To anneal copper, "smoke" the surface with carbon black from a candle flame or acetylene torch flame. Then heat slowly until the carbon just burns off. Then place the copper bit on a non heat conductive surface and let cool SLOWLY.
Quenching is the opposite of what annealing does.