Wenzhou CN6 Dongfeng 3308 mm Wheelbase Sewage Treatment Vehicle Government Procurement Case: In-depth Interpretation of Acceptance Criteria and Delivery Plan. In summer 2025, a municipal sanitation department in Wenzhou procured multiple CN6 Dongfeng 3308 mm wheelbase sewage treatment vehicles for its urban sewage treatment capacity enhancement project. These vehicles are primarily used for rapid treatment of sludge and wastewater in city drainage networks and pumping stations—especially for emergency operations during the frequent urban flooding caused by the plum rain season. According to publicly released tender information, the total project budget was capped at approximately RMB 1.33 million, with an individual vehicle price of around RMB 300,000. After delivery, customers reported stable performance under continuous high-load operation; notably, the anti-corrosion coating and sealing components demonstrated excellent durability under Wenzhou’s humid and hot climate conditions. This article uses this case as a core reference to deeply analyze key procurement aspects—from vehicle acceptance and parameter verification to delivery procedures—to provide practical guidance for similar projects. I. Ten Mandatory Inspection Items Upon Vehicle Receipt: Acceptance Key Points for Humid & Hot Southern Environments Wenzhou is located along the southeast coast, characterized by high annual humidity, summer heat, and abundant rainfall. Vehicles operate long-term under high-salinity fog and high-humidity conditions, making corrosion and seal failure common issues. Based on this case, the following ten items require special attention upon receipt: 1. Chassis Corrosion Inspection: Focus on main beams, welded chassis joints, and bolted connection points—ensuring no paint peeling or rust spots. Dongfeng chassis come factory-coated with anti-corrosion protection, but surface abrasion may occur during transport. 2. Tank Anti-Corrosion Coating: Internal tank surfaces must be coated with epoxy resin or polyurethane-based anti-corrosion paint; verify uniform coating thickness and absence of weak spots. 3. Seal Component Condition: Inspect manhole covers, pipeline flange joints, pump gaskets, etc., ensuring use of moisture- and heat-resistant rubber (e.g., EPDM) and checking for cracks or signs of aging. 4. Hydraulic System: Examine lifting cylinders and hydraulic line fittings for oil leakage or deformed O-rings—seals degrade more rapidly in high-humidity environments. 5. Electrical Wiring Protection: Verify wiring routing avoids heat sources and that connectors are properly waterproof-wrapped to prevent short circuits during rainy seasons. 6. Vacuum Pump Performance: Suction capacity must meet certified specifications; test full-load suction time against standards for model CLW5070GSSD6. 7. Emission System: Inspect integrity of CN6 after-treatment components (e.g., DPF, SCR), including thermal insulation layers and sensor interfaces, to prevent urea crystallization or exhaust system faults. 8. Tires & Braking System: Check tire inflation pressure and tread depth; inspect brake drums for corrosion to ensure safe braking performance during rainy conditions. 9. Onboard Tools & Documentation: Confirm completeness of documents including the Vehicle Factory Certificate of Conformity, Environmental Information Card, and Chassis Certificate of Conformity. 10. Operational Test Drive: Start the engine and verify hydraulic lift/lower functions, vacuum pump suction/discharge, lighting and signaling systems—and listen for abnormal noises. In this case, during on-site acceptance, the customer identified minor oil seepage at one hydraulic line fitting. Chengli’s after-sales team promptly replaced the seal ring and retested the system, ensuring zero-defect delivery. II. MIIT Parameter Verification Methodology: Practical Guidelines Based on Models Such as CLW5070GSSD6 Parameter verification is critical in government procurement to prevent discrepancies betwe