Government procurement case of National VI Dongfeng 3308 mm wheelbase sewage treatment vehicle in Weihai: Comprehensive interpretation of the acceptance, verification, and delivery process. I. Case Background and Procurement Requirements: In Q3 2025, a municipal sanitation department in Weihai (hereinafter referred to as the 'Procuring Entity') publicly tendered for a batch of sewage treatment vehicles to meet local sewer network maintenance and emergency response needs. Per local procurement practice, the entity explicitly specified the chassis as National VI Dongfeng with a 3308 mm wheelbase, and the superstructure to be manufactured by Chengli Special Purpose Vehicle Co., Ltd., ensuring compliance with stringent emission standards, high maneuverability, and efficient sewage treatment capability. The budget was capped at approximately RMB 513,000 per unit (based on publicly available tender information), with two units planned for procurement—intended for emergency suction and preliminary purification operations at urban drainage pumping stations, residential septic tanks, and industrial park facilities. Chengli Special Purpose Vehicle Co., Ltd. (hereinafter referred to as 'Chengli') successfully delivered the vehicles, leveraging its extensive official announcement parameters, factory-direct sales advantage, and service experience with over 500 municipal clients. This article uses this procurement as a case study to examine the 10 critical items for vehicle acceptance, methods for verifying Ministry of Industry and Information Technology (MIIT) parameters, Chengli’s delivery-process assurance mechanisms, and answers to frequently asked questions. II. Ten Mandatory Inspection Items Upon Vehicle Receipt: To ensure full compliance with the procurement contract and national mandatory standards, the Procuring Entity rigorously executed the following acceptance checklist on-site. These ten items comprehensively cover vehicle appearance, functionality, safety, and environmental requirements—representing a typical 'standardized acceptance' procedure in government procurement. No. | Inspection Item | Inspection Content & Criteria | Example Acceptance Result 1 | Vehicle Appearance & Identification | Body free of scratches or rust; clearly marked with 'Sewage Treatment Vehicle' and safety warning labels; reflective strips fully intact. | Meets Requirements 2 | Chassis & Engine | Verify chassis model (Dongfeng 3308 mm wheelbase), engine number, and emission standard (National VI); engine operates smoothly without abnormal noise. | Meets Requirements 3 | Sewage Tank Sealing Performance | Tank shows no leakage; wall thickness complies with design specifications (refer to official announcement parameters for models such as CLW5070GSSD6); manhole cover seals properly. | Meets Requirements 4 | Vacuum Pump System | After startup, tank vacuum pressure reaches −0.08 MPa within 5 minutes; vacuum gauge displays normally; no air leakage detected. | Meets Requirements 5 | Sewage Suction/Discharge Function | Tested with clean water: suction rate ≥1.2 m³/min; discharge rate ≥0.8 m³/min; all valves operate smoothly. | Meets Requirements 6 | Hydraulic System | Hydraulic oil level normal; hydraulic cylinders extend/retract freely; no oil leakage; hydraulic pump operating noise ≤75 dB. | Meets Requirements 7 | Electrical & Control Systems | Dashboard indicator lights function correctly; control panel buttons respond sensitively; sewage level alarm system operates effectively. | Meets Requirements 8 | Safety Devices | Onboard fire extinguisher, warning triangle, seat belts, etc., are complete; overload protection and emergency stop button functions operate normally. | Meets Requirements 9 | Accompanying Documentation & Tools | Certificate of Conformity, warranty card, operation manual, and official announcement parameters for both chassis and superstructure are all present; tools—including jack and wrenches—are complete and undamaged. | Meets Requirement