Material Compliance Verification
Prioritize requesting third-party test reports for materials such as 304 stainless steel. Verify that the content of key elements-like chromium and nickel-meets national standards (e.g., GB/T 3280) to avoid substandard products and prevent future issues such as pitting corrosion or leakage.
Sealing and Dimensional Accuracy Checks
Ensure that the accompanying EPDM or silicone gaskets have a hardness within the 60–70 Shore A range and that the coupling's inner diameter tolerance matches the pipe's outer diameter; this guarantees leak-free performance even under water hammer conditions.
Qualification and Application Suitability
For fire protection projects, confirm the product holds certification under the GB 5135.11 standard. For food and drinking water applications, select sanitary-grade sealing components; for corrosive chemical environments, prioritize corrosion-resistant materials such as 316L stainless steel.
Supplier Selection
Prioritize suppliers capable of providing a full range of matching fittings to avoid sealing risks caused by inconsistent tolerances across different batches. Also, favor suppliers who offer pre-fabrication and local delivery services to help shorten construction timelines.
Post-Delivery Spot Checks
Upon receipt, visually inspect pipe ends and the inner edges of couplings to ensure they are free of burrs. Conduct spot checks on a small sample to verify hydrostatic pressure performance and confirm that product specifications align with design pressure requirements.