My problem with compression fittings is that when I tighten the nut th
pipe inside the nut also turns a little bit. This can be a big proble because it leads to loss of compression (and leaks) if there is a fixe nut in close proximity or to loss of geometry in the rest of th piping.
In the past I have been able to avoid it by holding the twisting pip with a grip plier. The problem is that it requires "three hands" an leaves gripping marks on the pipe. Sometimes, to stop the twisting th gripping can lead to damage to the pipe.
I know I can use push fit fittings or soldered joints but I would lik to know how to avoid this problem for future needs and for m particular situation now:
I am required to use compression fittings, with an existing compressio service valve separated by 5cm of free pipe from a 90 degree compressio fitting.
Thanks,
Antoni
-- asalcedo