Compression fittings work fine in situations where the pressure does
not change significantly. When the pressure cycles, you eventually
deform either the tubing or the collar, and they leak. Temperature
cycling is also bad for the same reason.
The result is that the tubing can shrink inside the collar. this
leads to leaks or fractures, as stress corrosion is also a result of
strain changes.
Flare fittings can also leak, but there is a very small chance in
comparison that the tubing will come loose and slide out of the fitting.
Peter
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