What should be done if a flareless tube nut is over-tightened?

• A. It should be replaced immediately
• B. It should be loosened
• C. It will require a new fitting
• D. It should be left as is

Answer: (C)

If a flareless tube nut is over-tightened, it can cause damage to the fitting and potentially the tubing itself. Over-tightening can lead to deformation of the nut or the fitting, compromising the seal and creating a risk of leakage. In such situations, it is often necessary to use a new fitting because the integrity of the original fitting may be compromised.

A new fitting ensures that the connection can be properly made without risk of failure due to stress damage or deformation from the excessive torque applied. This prevents the risk of leaks and maintains the reliability and safety of the fluid system. Replacing the fitting also allows for proper installation practices to be followed, ensuring that the connections are secure without the risk associated with previously over-tightened components.