Different industrial plants use stainless steel compression tube fittings for a range of applications. The reason behind their wide usage is the high working pressure rating which is typically above 6000 psi. This introduces a high safety factor for the operation.
The pressure rating depends on wall thickness and construction, both of which are related to the size of tubing. A variety of different tube fitting sizes are used, depending on the application requirement. Hence, the pressure rating of a tube in a particular operation varies based on these factors.