The Effects of Overtightening Compression Tube Fittings

EDMOND, Okla. - Sept. 12, 2023 - PRLog -- The Effects of Overtightening Compression Tube Fittings

Tighter isn't always better if you're over-tightening a fitting, and judging what's "tight enough" is risky. Fitting torque can vary widely based on tubing wall thickness, fitting manufacturer, or factors like tubing side-load. Many installers lack knowing what a gap gauge is, or how to use one.

Properly sealed connections are crucial. These systems route high pressure, high temperature, or even hazardous chemicals. Undoubtedly, any gasses leaking could mean huge risks to personnel, property, and the environment.

Diagnosing/Fixing Over-Tightening Issues
1 -Can't Disassemble the Fitting
During maintenance, it's common for workers to disassemble compression connections. After loosening the nut, the tubing should come away easily. Once disassembled, if the tubing stays connected to the fitting, inspect that union for signs of over-tightening.
The tubing will bulge and stick inside of the fitting if the ferrules are overly secure.
If you can't disassemble the valve or fitting, it's a good indicator that the connection is too tight. The only thing to do, is to remove and replace the fitting in question. Additionally, you'll need to replace any tubing run that you can't remove from the fitting.

2 -Fittings or Tubing is Deformed
If proper tightening procedures aren't followed, it's possible for tubing or fittings to become deformed. Look at the wrench flats of the fitting and if the corners are starting to round over, the fitting has likely been strained. On tubing, it's harder to see the deformation without disassembling the fitting. Inside the fitting, the ferrules will begin to crush the tubing. This constricts flow and thins the wall of the tubing. Subsequently, this increase of local pressure and weakening of the tubing, will cause compression fittings to catastrophically release the tubing.

3 - What if the Valve Breaks
Look for cracks near valve connection points, this could be a sign of over-tightening. Though valve breakage is rare, never underestimate a poorly trained installer with a big wrench.

4 - System is Having Leaks
If you're experiencing leaks, now is the perfect time to check for over-tightened connections. First, inspect the fitting gap with a gap gauge to rule out under-tightening. If your gauge does not fit, it's time to start looking for the other signs of over-tightening.

Number One Avoidance Technique
The best way to solve these issues is to remove human error from the equation. Superlok i-Fitting eliminates human error by including a gap gauge on every fitting. Just tighten until the red ring snaps away for a perfect leak-free seal every time. Fittings change to a blue color once tightened, meaning you can see from a distance if a fitting is secure. Learn more at http://www.superlokworld.com