Gasket Packing Q&A No. 20 Torque Management Guidelines
Is there a guideline for torque management when tightening bolts?
It is difficult to implement torque management for all flanges. Please refer to the following for an idea of the force generated by tightening. Guidelines for pulling force Generated force F - An adult pulling with just wrist strength → 50–100 N - An adult pulling with one arm strength → 100–200 N - An adult pulling with upper body strength → 200–400 N
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■Things to be careful 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 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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