how tight to tighten a 1in union

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rrekih

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How tight should a 1in copper union be tightened?
I have 2 that I have tried to tighten to no avail.
Still very small leak under air pressure test of 40psi.
I did sweat a threaded adapter to the union.
The seal looks clean but dis-colored.
Is there a way to lap the two matting surface's together?
 
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