The end of a tube should be cleaned for a distance how much more than is required to enter the socket of the fitting?

Cleaning the end of a tube for a distance greater than what is required to enter the socket of the fitting is crucial for ensuring a proper connection. In this case, cleaning an additional 1/4 of an inch helps to remove any potential debris, dirt, or oxidation that may have accumulated on the surface. This additional clean area ensures that when the tube is inserted into the fitting, a good seal can be made, which helps to prevent leaks and ensures the integrity of the joint.

The standard practice in pipe fitting emphasizes that this extra cleaning helps to facilitate a smooth insertion and enhances the reliability of the joint connection. By ensuring that 1/4 of an inch is clean, the technician can guarantee that any potential contaminants do not interfere with the sealing process, allowing for a more efficient and effective fitting operation.