I. Case Background: Sewer Cleaning Truck Procurement Requirement of a Municipal Sanitation Department in Handan City. At the end of 2024, a municipal sanitation department in a district of Handan City faced increasing demands for cleaning urban drainage pipelines due to aging equipment. It planned to procure a batch of blue-license-plate Dongfeng dual-cab sewer cleaning trucks, primarily for unclogging and sludge removal in narrow alleys, residential communities, and areas surrounding schools. The procurement budget was capped at approximately RMB 340,000 per unit, with requirements including C1 driver’s license operability, a 3-cubic-meter sludge tank capacity, a dual-row cab accommodating 4–5 persons, and compliance with China VI emission standards to ensure smooth registration and annual inspection in Handan and surrounding regions. Prior to procurement, the department conducted supplier evaluations across multiple vendors, including local dealers and specialized vehicle manufacturers based in Suizhou. According to publicly released tender information, Chengli Special Purpose Vehicle Co., Ltd. was awarded the contract and delivered two units of Dongfeng dual-cab sewer cleaning trucks (model CLW5070GSSD6, chassis-modified). Each unit cost approximately RMB 125,000, bringing the total contract value to around RMB 250,000. This solution not only met the budget constraints but also gained approval from the procuring entity due to the high local market penetration of the Dongfeng Dorica chassis in Handan and its extensive, well-established after-sales service network. II. Interpretation of the Winning Solution: Configuration and Advantages of the Blue-License-Plate Dongfeng Dual-Cab Sewer Cleaning Truck (3 m³) The vehicles delivered by Chengli were modified on the Dongfeng Dorica chassis, with the following key specifications: - Chassis Model: Dongfeng Dorica (official model CLW5070GSSD6), China VI compliant; equipped with either a Quanchai or Yunnan Diesel engine, rated power ~85 kW. - Cab: Dual-row configuration, seating up to five occupants—ideal for team-based operations. - Tank Capacity: 3 cubic meters; fabricated from Q235 carbon steel with 4 mm wall thickness and internal anti-corrosion treatment. - Cleaning Functions: Integrated high-pressure cleaning system (operating pressure: 16 MPa), vacuum pump (flow rate ≥40 m³/h), and hydraulic lifting/tipping mechanism for rapid sludge discharge. - Superstructure Features: Includes observation window (‘sewage viewing port’), gravity discharge outlet, anti-overflow valve; optional thermal insulation or heating systems available for the tank. The core advantage of this solution lies in its blue-license-plate classification: operable with a standard C1 driver’s license, exempt from urban driving restrictions, and highly maneuverable for access into residential compounds and narrow backstreets. Furthermore, the Dongfeng chassis benefits from nationwide warranty coverage, while Chengli provides lifetime support for the superstructure—ensuring reliable long-term operation and maintenance. According to client feedback, the vehicles entered service immediately upon delivery for pipeline cleaning in a designated subdistrict of Handan City, achieving an average daily cleaning length of ~50 meters with consistent performance. III. Spare Parts Procurement Analysis: List of Common Wear Parts and Price Transparency As a heavy-duty operational vehicle, sewer cleaning trucks experience significant wear on hydraulic components, high-pressure piping, and sealing elements. Below is a representative list of commonly replaced parts along with reference pricing (based on Chengli’s official after-sales quotations and publicly available market data): Part Name | Application Area | Reference Price (RMB) | Recommended Replacement Interval ---|---|---|--- High-Pressure Hose (Φ25 mm) | High-pressure cleaning system | 150–200 | 6–12 months Vacuum Pump Sealing Kit | Vacuum pump | 80–120 | 3–6 months Hydr