What should be avoided to prevent reducing the flare thickness during installation?

To prevent reducing the flare thickness during installation, over-tightening the flare should definitely be avoided. When a flare fitting is excessively tightened, it can result in deformation of the flare surface, which compromises the integrity of the connection. This deformation leads to a thinner flare at the point of contact, which can affect the seal and ultimately lead to leaks.

A proper connection relies on a uniformly tightened flare; if too much pressure is applied, the metal can yield and may not make the tight seal necessary for optimal performance. Understanding the appropriate torque specifications for flare fittings is crucial in maintaining the necessary flare thickness and preventing connection failures.

The other choices, while important considerations in the installation process, do not directly address the specific issue of flare thickness. Using improper tools might lead to damage but does not specifically affect the flare thickness. Similarly, installing in a dirty environment or using incompatible materials can cause issues with contamination or corrosion, but will not inherently change the thickness of the flare itself.