What is Huilin's quality control process for its complete oxygen and nitrogen generator systems?

We apply quality control across order review, design, procurement, incoming inspection, manufacturing, complete-machine testing, final inspection, delivery and after-sales closed-loop, with complete records, one file per unit and fully traceable issues. Backed by a 2500 m² production base, an independent laboratory and Siemens PLC control, quality spans design, production and verification.

• Order and design: We review every order to clarify parameters, media, pressure, standards, certification requirements and risks. Design follows GB150; export projects match ASME, ISO 8010 and SABER. Control systems include pressure and over-temperature interlocks. Drawings, calculations and BOM require formal approval, as do any design changes.
• Procurement and incoming inspection: Key parts come from qualified suppliers. Inspection verifies certificates and third-party reports; appearance, dimensions and performance are sampled or fully checked. Non-conforming items are quarantined and returned; conforming items enter storage with batch records.
• Manufacturing process: Quality control points sit at shell rolling, welding and pressure-bearing assembly. Welding follows the Welding Procedure Specification by certified welders. In-process inspection blocks, labels and quarantines non-conforming work. Tooling and instruments are periodically calibrated; special operations follow work permits.
• Component inspection: Pressure-bearing components undergo NDT and hydrostatic testing with records retained; valves and instruments are individually calibrated.

5. Complete-machine testing: After assembly, machines run air-tightness, system pressure commissioning, purity and flow testing. Safety interlocks are verified item by item. Failed units cannot proceed to delivery; units also undergo continuous full-load trial operation.

6. Final inspection and documentation: Appearance, configuration, markings and nameplate are verified. Documents include P&IDs, installation and electrical drawings, certificates, test records, user manuals and pressure-vessel documents. Export projects add matching certification files under one-file-per-unit archives.

7. Packaging and on-site delivery: Protective packaging matches operating conditions; on arrival we support unpacking, verify equipment and documents, and provide operation training.

8. After-sales: We collect site feedback; quality issues trigger root-cause analysis and CAPA, tracing design, procurement and production to prevent recurrence.