What should be checked on existing ring joint flanges?

When inspecting existing ring joint flanges, a key concern is to check for cracking as a result of excessive bolt tightening. Tightening bolts too much can induce stress concentrations that may lead to cracks or failures in the flange material. This is particularly important for ring joint flanges, which rely on a precise fit and proper tensioning to create an effective seal. If cracks are present, they can compromise the integrity of the flange and ultimately affect the safety and reliability of the system.

While thickness, corrosion, and alignment of bolt holes are also relevant factors in a comprehensive inspection, the immediate risk posed by cracking due to over-tightening directly impacts the operational safety of the flange. Therefore, this is prioritized during inspections to ensure that the flanges continue to function appropriately and avoid potential leaks or catastrophic failures in pressure vessel systems.