Gasket Packing Q&A No. 16 Spiral Wound Gasket
Is the inner ring of a spiral gasket necessary? What are the advantages over just having the outer ring?
The spiral gasket is used for high pressure, which can cause the sealing part of the spiral gasket to buckle. As a countermeasure, the use of inner and outer rings is recommended. By using an inner ring, deformation of the sealing part at the inner diameter is prevented. ■Example of a problem 〇 Leakage occurred from the vortex, and when the flange was released, the gasket was deformed as shown in the photo. ■Possible factors 〇 The flange was class 900 (63K) or higher, resulting in a large tightening force. 〇 The flange size was large (26B or more), making the gasket body prone to disassembly. ■Countermeasures 〇 When using graphite or Teflon fillers, use inner and outer rings. 〇 If the diameter is large, use inner and outer rings.
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 poses a risk 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 shorter
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What causes leaks when using gaskets? ~Surface Leakage Edition~
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