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常见问题
?Does every rubber expansion joint require hydrostatic testing?
Not necessarily. Whether testing is performed on every unit, by batch sampling or under another agreed method depends on the product specification, purchase contract and approved inspection plan.
?Which dimensions should be checked before shipment?
Typical checks include nominal size, bore, face-to-face length, flange outside diameter, flange thickness, bolt-circle diameter, number and diameter of bolt holes, sealing surface and connection alignment.
?Is visual inspection enough to confirm product quality?
No. Visual inspection identifies surface defects, but quality control should also cover raw materials, internal reinforcement, curing records, metallic components, dimensions, traceability and required testing.
?How can the specified elastomer compound be verified?
Verification should use controlled raw-material records, batch identification, production documentation and agreed material checks. Colour or surface appearance is not sufficient.
?When should third-party inspection be specified?
Third-party inspection, witness points and special testing should be stated during the RFQ or order stage because they may affect cost, production planning and delivery time.
?Which quality documents can be supplied with the shipment?
Depending on the order, the shipment may include approved drawings, dimensional records, visual inspection reports, test reports, material documents, product photographs, packing lists and third-party inspection reports.