Government Procurement Case of Dongfeng Single-Cab Sewer Cleaning Truck (Blue License Plate, 5-cubic-meter Capacity) in Mianyang: Parameter Comparison and Selection Scheme Interpretation In 2025, a municipal sanitation department in Mianyang City, Sichuan Province, issued a public tender for a batch of blue license plate, 5-cubic-meter sewer cleaning trucks to address sediment removal requirements in urban rivers and drainage pipelines. The project specified vehicles equipped with Dongfeng single-cab chassis, compliant with blue license plate regulations (drivable with C1 driver’s license), tank capacity of approximately 5 cubic meters, and integrated functions including high-pressure cleaning, vacuum suction, sludge-water separation, or self-dumping capability. Following multiple rounds of technical evaluation and price comparison, Chengli Special Purpose Vehicle Co., Ltd. (hereinafter referred to as 'Chengli') secured the contract—leveraging its comprehensive advantages, including full official vehicle announcements, original-equipment manufacturer (OEM) chassis warranty, and lifetime after-sales service for the superstructure—and ultimately delivered five customized sewer cleaning trucks. This article uses the case as a reference point, offering parameter comparisons, operational scenario suitability analysis, and selection guidance to support similar procurement decisions. I. Project Background and Core Requirements As a key ecological barrier city upstream of the Yangtze River, Mianyang conducts routine sediment removal operations prior to each annual flood season across over 140 kilometers of urban drainage pipelines, more than 30 pumping stations, and associated river sections. The core challenges identified for this procurement were: • Road Access Constraints: Narrow alleys, aging residential communities, and bridge height/width restrictions necessitated vehicles with overall length ≤ 5.99 meters and overall height ≤ 2.2 meters—strictly complying with blue license plate classification (C1 driver’s license operable). • Operational Efficiency Requirements: Each complete cleaning cycle—including suction, transport, and discharge—must be completed within 30 minutes; thus, effective tank capacity must be ≥ 4.5 cubic meters, and a high-pressure cleaning system (≥ 16 MPa pressure) is mandatory. • Environmental Compliance & Regulatory Readiness: Full compliance with China VI emission standards; complete official vehicle announcements enabling normal registration and annual inspection. • After-Sales Support: Chassis must be covered under nationwide warranty; superstructure must include lifetime technical support, with spare parts dispatched directly within 24 hours. II. Horizontal Parameter Comparison Across Five Mainstream Models A total of five model proposals were submitted in response to this tender—all based on Dongfeng single-cab chassis and configured as blue license plate, 5-cubic-meter sewer cleaning trucks. Chengli’s proposed model was CLW5040TQYD6 (built upon the Dongfeng D6 Dolika chassis); the other four models were offered by different manufacturers. The following parameters are compiled from the Ministry of Industry and Information Technology (MIIT) official announcements and respective enterprise product databases: Parameter | Chengli CLW5040TQYD6 | Manufacturer B Model Y | Manufacturer C Model Z | Manufacturer D Model W | Manufacturer E Model V ---|---|---|---|---|--- Chassis Model | Dongfeng Dolika D6 | Dongfeng Furika | Dongfeng Xiaobawang | Dongfeng Dolika D5 | Dongfeng Tuyi Engine | Quanchai Q23-115E60 | Yunnan YN D20TCIF11 | Quanchai Q23-95E60 | Quanchai Q23-115E60 | Yunnan YN D20TCIF11 Emission Standard | China VI | China VI | China VI | China VI | China VI Tank Capacity | 5.0 m³ | 4.8 m³ | 4.5 m³ | 5.0 m³ | 4.5 m³ High-Pressure Cleaning System | Standard (16 MPa) | Optional (14 MPa) | Standard (12 MPa) | Standard (16 MPa) | Optional (14 MPa) Sludge-Water Separation Function | Standard (Screw-Ex