Government Procurement Case and Chassis Selection Solution for the 3308 Yellow-Plate Sewage Treatment Truck in Yinchuan In Northwest China—particularly in frigid regions like Yinchuan, Ningxia—municipal sanitation departments face core challenges beyond mere sewage treatment efficiency: stable vehicle start-up at -20°C extreme low temperatures, smooth hydraulic system operation, and long-term maintenance convenience. Recently, a municipal sanitation department in Yinchuan planned to procure a batch of 3308 yellow-plate sewage treatment trucks, with a budget capped at approximately RMB 334,000 (per publicly announced tender information), for emergency handling of urban sewer networks and routine maintenance in key areas. Chengli Special Purpose Vehicle Co., Ltd. (hereinafter referred to as 'Chengli') developed a customized solution based on Dongfeng chassis, tailored to local climatic conditions and operational requirements, and successfully delivered the vehicles. This article provides an in-depth analysis of the case from critical dimensions including chassis selection, freeze resistance, and winter maintenance. I. Project Background and Requirements Analysis Yinchuan is located in Northwest China, where winters are long and temperatures can drop to -25°C, while summers are hot and arid. The municipal sanitation department required a yellow-plate sewage treatment truck primarily for street sewer manhole cleaning, pipeline unclogging, and emergency response to sudden sewage leaks. Key requirements included: • Low-Temperature Start Capability: The vehicle must achieve successful cold-start within one attempt at -20°C; neither the hydraulic system nor the sewage pump may freeze or malfunction due to low temperatures. • Maneuverability and Load-Bearing Capacity: Operational zones include narrow alleys and aging residential communities, requiring a small turning radius and a stable, high-load-bearing chassis. • Maintenance Convenience: Local service networks must support both chassis and upper-body components to avoid downtime caused by parts shortages. • Environmental Compliance: All vehicles must meet China VI emission standards and be eligible for local registration and annual inspection. After field research, the Chengli team recommended the CLW5070GSSD6 model sewage treatment truck built on the Dongfeng 3308 mm wheelbase chassis (referencing MIIT announcement parameters) and implemented climate-specific modifications for Yinchuan. II. In-Depth Chassis Selection Analysis: Comparative Evaluation of Dongfeng, Sinotruk, Foton, and FAW In the sewage treatment truck sector, chassis selection directly determines vehicle reliability, payload capacity, and maintenance cost. Chengli’s product database covers mainstream chassis brands—including Dongfeng, Sinotruk, Foton, and FAW—but for the Yinchuan project, the team conducted a focused comparative analysis of the following four chassis types across key parameters: Parameter Dimension | Dongfeng (Preferred) | Sinotruk | Foton | FAW ---|---|---|---|--- Wheelbase (mm) | 3308 | 3360 | 3360 | 3300 Maximum Permissible Gross Vehicle Mass (kg) | 7,360 | 8,200 | 7,300 | 7,400 Engine Power (kW) | 85 (~115 hp) | 96 (~130 hp) | 85 (~115 hp) | 90 (~122 hp) Cold-Start Functionality | Standard preheating device | Optional heating system | Basic preheating | Standard preheating device Hydraulic System Adaptability | Low-temperature专用 hydraulic oil | Standard hydraulic oil | Requires additional modification | Low-temperature hydraulic oil available as option Local Service Network Coverage (Yinchuan) | Dongfeng nationwide warranty; 3 service stations in Yinchuan | Limited Sinotruk service points; cross-regional repairs required | Moderate Foton service station coverage | Good FAW service station coverage Maintenance &