Government Procurement Case and Bid-Winning Solution Analysis for the Dongfeng Single-Cab Sewer Cleaning Truck (Blue License Plate, 5 m³ Capacity) in Langfang City. In spring 2025, a municipal sanitation department in Langfang City planned to procure a batch of blue-plate sewer cleaning trucks to enhance urban drainage pipe desilting operations. Per local procurement practices, the budget was capped at approximately RMB 338,000, with core requirements including C1 driver’s license operability, standard blue license plate registration eligibility, a 5 m³ wastewater tank capacity, and high-pressure flushing functionality. After multiple rounds of evaluation and technical proposal reviews, the selected vehicle featured a Dongfeng single-cab chassis paired with Chengli’s proprietary superstructure. Based on this case, this article provides an in-depth analysis of configuration differences between the base and premium versions, the value proposition of optional accessories, and Chengli Special Purpose Vehicle’s transparent pricing logic—offering practical reference for similar procurement projects. I. Project Background and Core Requirements This procurement targeted desilting operations for drainage pipelines in older residential communities, commercial streets, and selected main roads within the city. According to project managers, previously deployed yellow-plate sewer cleaning trucks faced operational constraints due to excessive overall length and gross vehicle weight, limiting access to narrow streets; additionally, drivers required a B2 driver’s license, increasing labor costs. Consequently, blue-plate sewer cleaning trucks emerged as the preferred solution. Specific requirements included: • Chassis: Dongfeng single-cab cab, wheelbase approx. 3,300 mm, China VI emission standard (refer to official announcement parameters for model CLW5070GSSD6). • Tank: Effective capacity approx. 5 m³; material Q235B carbon steel, thickness 4 mm. • Functions: High-pressure cleaning (pressure ≥16 MPa, flow rate ≥100 L/min), self-priming suction (suction lift ≥6 m), and hydraulic tank tipping/unloading. • Control System: Manual or electro-hydraulic operation. • Standard Accessories: 30-meter high-pressure hose, suction hose, cleaning nozzle, safety warning lights, etc. • Registration & Compliance: Meets China VI emission standards; eligible for nationwide registration, annual inspection, and commercial operation (Chengli holds complete official announcements and can supply full technical specifications). II. Comparison of Base vs. Premium Configuration Specifications Based on Chengli Special Purpose Vehicle’s product database and the actual tender documents for this project, we summarize key differences between the base and premium configurations. While the base version fulfills fundamental operational needs, the premium version enhances operational convenience, durability, and functional expandability. Configuration Item | Base Version (e.g., CLW5070GSSD6 Chassis) | Premium Version (e.g., CLW5070GSSD6 Upgraded Model) | Difference Explanation ---|---|---|--- Engine Power | Yunnan YN D20TCIF1 (85 kW / 115 HP) | Quanchai Q23-115E60 (85 kW / 115 HP) | Premium version offers optional Quanchai engine with marginally improved fuel efficiency. Transmission | 5-speed manual | 6-speed manual | Premium version features smoother gear shifting, better suited for complex road conditions. Tank Material | Q235B carbon steel, 4 mm thickness | Q235B carbon steel, 5 mm thickness | Premium version uses thicker tank walls for enhanced corrosion resistance. High-Pressure Pump | Domestic plunger pump (16 MPa pressure) | Imported Italian pump (20 MPa pressure) | Premium version delivers higher pressure, improving cleaning efficiency by ~30%. Control System | Manual hydraulic valve | Electro-hydraulic valve (remote control capable) | Premium version enables remote operation, significantly reducing operator physical workload. Suction Tank | Hydraulic tipping (dual-