Gasket Packing Q&A No. 13: What is compression failure of a seat?
What is the compressive failure of a joint sheet?
There are several issues with joint sheets, but I will explain the most common case, which is compression failure. ◆Details of the problem 〇Cracks occurred around the gasket, making it extremely thin. ◆Possible causes 〇Compression failure due to excessive tightening. 〇Excessive load applied to a part of the gasket due to lack of parallelism of the flange or deformation. 〇Localized slippage of the joint sheet due to uneven application of paste. ◆Countermeasures 〇Tighten without exceeding the allowable tightening surface pressure of the gasket. 〇Problems caused by improper construction such as single-sided tightening, insufficient tightening, or excessive tightening. 〇Correct the parallelism and deformation of the flange. 〇When applying paste, apply it thinly and evenly.
basic information
■Things to be cautious about with non-asbestos joint sheets 〇 Tighten with sufficient force from the beginning 〇 Do not retighten after a period of time following temperature rise → The gasket hardens due to heat, and retightening after hardening may lead to gasket breakage which is a concern 〇 When used for steam seals, special care is needed as hardening is more likely to occur → Compared to asbestos joint sheets, higher tightening force is required, and the lifespan is also shorter
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