Define the flange before the gasket
A nominal pipe size does not fully describe a flange gasket. Provide the flange standard and edition, facing type, inside/outside diameters and bolt-circle details, or a drawing for a non-standard joint.
- Distinguish full-face and ring-style layouts.
- Include the flange material and condition.
- Identify the tightening procedure specified by the assembly owner.
Compression depends on the complete joint
Gasket thickness and compound must be considered with the flange stiffness, bolt arrangement and process exposure. A flange pressure class is not a pressure rating for an unspecified rubber gasket. Supplier torque tables for a different gasket and joint cannot be transferred directly.
What the quotation should resolve
Agree the profile, compound, inspection dimensions and applicable joint validation before ordering. Any allowable bolt load or torque must come from the approved joint procedure; this family page deliberately gives no universal torque value.
Prepare your inquiry
- Flange drawing or exact standard identification.
- Process and cleaning conditions.
- Specified joint assembly procedure.
- Required material/inspection documents and quantity.
Buyer questions
Does the flange class define the gasket rating?
No. The joint, gasket construction and service conditions must be evaluated together.
Can I use a torque value found online?
Use the procedure approved for the actual flange, bolts and gasket. A table for another construction may have different assumptions.
Related project families
Engineering reading
General references and scope
These references explain general engineering or regulatory context. They are not Xinwei finished-product specifications, test results or compliance evidence.