Government Procurement Case and Chassis Selection Analysis for the Xiamen National VI Dongfeng Sewage Treatment Vehicle with 3308 mm Wheelbase In southern coastal cities such as Xiamen, municipal sanitation departments frequently face challenges in sewage treatment under high-humidity conditions during the rainy season. In 2025, the Urban Management Bureau of a district in Xiamen planned to procure a batch of National VI emission-standard sewage treatment vehicles to improve maintenance efficiency of local drainage networks, specifically addressing poor rainwater drainage and sewer cleaning issues in aging urban areas. According to local procurement practices, the budget was capped at approximately RMB 333,000 per unit, with requirements for high maneuverability, strong corrosion resistance, and suitability for frequent operation. This article uses this case as background and, from the perspective of chassis selection, compares mainstream chassis brands—including Dongfeng, Sinotruk, Foton, FAW Jiefang—and integrates Chengli Special Purpose Vehicle’s solution to provide professional insights for government procurement. I. Project Background and Requirements Analysis This procurement project primarily targets Xiamen’s old urban districts, where roads are narrow and drainage systems outdated. The client—namely, a municipal sanitation department—specified the following core performance requirements: • Rust-Resistant Coating: As Xiamen features a subtropical maritime climate with high salinity fog, both chassis and superstructure must possess strong corrosion resistance to prevent rust-related degradation within 3–5 years’ service life. • Sealing Component Durability in Humid-Hot Environments: High operational frequency during the rainy season, combined with corrosive substances in wastewater and elevated ambient humidity/temperature, accelerates sealing component aging; therefore, weather-resistant seals are essential. • High-Load Performance Under Rainy-Season Operating Conditions: During typhoon season (May–September), continuous operation is required, demanding exceptional engine cooling capacity and hydraulic system reliability. • Maneuverability: A 3308 mm wheelbase model must balance turning agility and load-carrying capability, making it suitable for narrow-road navigation. II. Chassis Selection Comparison: Dongfeng vs. Sinotruk vs. Foton vs. FAW Jiefang Based on Chengli Special Purpose Vehicle’s coverage of major chassis brands (Dongfeng, Sinotruk, Foton, FAW Jiefang, Shaanxi Automobile), the following analysis focuses on three key dimensions—load capacity, maneuverability, and maintenance accessibility—specifically for 3308 mm wheelbase models. Chassis Brand | Representative Wheelbase (mm) | Load Capacity (Gross Vehicle Weight, kg) | Maneuverability (Minimum Ground Clearance, mm) | Maintenance Accessibility (Service Network Density) | Typical Application Scenarios | Corrosion Protection ---|---|---|---|---|---|--- Dongfeng (e.g., EQ1075SJ3CDF) | 3308 | 7,360 (Light-Duty Truck Class) | 180–200 | Nationwide warranty network; highest service point density | Urban narrow streets, residential communities, industrial parks | Factory-applied electrophoretic coating + zinc-alloy layer; excellent corrosion resistance Sinotruk (e.g., ZZ1087F3315F183) | 3280 | 8,280 | 190–210 | Extensive network, though slightly less dense in southern regions | Heavy-duty applications, e.g., large-scale wastewater treatment plants | Standard corrosion protection; additional anti-corrosion coating recommended Foton (e.g., BJ1088VEJEA-F3) | 3360 | 8,275 | 170–190 | Dense network, but higher parts cost | Logistics, light-duty sanitation operations | Moderate corrosion resistance; periodic maintenance required FAW Jiefang (e.g., CA1080P40K62L2BE6A84) | 3300 | 8,200 | 185–200 | Strong presence in northern China; relatively limited coverage in southern regions | Northern cities, highway transportation | Standard corrosion protection Shaanxi Automobil