In the municipal sanitation sector, sewage treatment vehicles serve as a critical component of environmental protection equipment, directly impacting urban sewage treatment efficiency. Recently, a municipal sanitation department in Baoding City conducted a government procurement tender for a yellow-plate sewage treatment vehicle with a 3308 mm wheelbase, aiming to enhance local sewage treatment capacity. Based on publicly available tender information and technical specifications of five mainstream models offered by Chengli Special Purpose Vehicle Co., Ltd. (hereinafter referred to as 'Chengli'), this article conducts a comparative analysis to interpret the vehicle selection logic behind the winning bid, providing reference guidance for similar procurement projects. I. Case Background and Procurement Requirements The procuring entity is a district-level municipal sanitation department in Baoding City, primarily responsible for handling urban domestic sewage and small-scale industrial wastewater. The project budget was capped at approximately RMB 336,000, with requirements specifying a yellow-plate vehicle compliant with China VI emission standards, a 3308 mm wheelbase, and capabilities for suction, transportation, discharge, and preliminary purification. The purchaser emphasized the need for adaptability to complex road conditions, ease of operation, and long-term durability. According to publicly available tender information, the winning model was the Chengli CLW5070GSSD6 sewage treatment vehicle, priced at approximately RMB 280,000. II. Comparative Analysis of Five Mainstream Models To comprehensively evaluate options, we selected five yellow-plate sewage treatment vehicles with a 3308 mm wheelbase—including the Chengli model and representative models from other manufacturers—for parameter comparison. All data cited below are sourced from MIIT announcements and official manufacturer documentation (e.g., model numbers such as CLW5070GSSD6). Note: Parameters may vary slightly across production batches; actual vehicle specifications shall prevail. Parameter Item | Chengli CLW5070GSSD6 | Competitor A (Dongfeng Chassis) | Competitor B (Sinotruk Chassis) | Competitor C (Foton Chassis) | Competitor D (FAW Jiefang Chassis) ---|---|---|---|---|--- Announcement Model | CLW5070GSSD6 | — | — | — | — Chassis Brand | Dongfeng | Dongfeng | Sinotruk | Foton | FAW Jiefang Wheelbase (mm) | 3308 | 3308 | 3308 | 3308 | 3308 Emission Standard | China VI | China VI | China VI | China VI | China VI Tank Capacity (m³) | ~4.5 | ~4.8 | ~4.2 | ~4.3 | ~4.6 Maximum Suction Depth (m) | 8 | 7.5 | 8 | 7 | 7.5 Engine Power (kW) | 96 | 95 | 100 | 93 | 97 Reference Price (RMB 10,000s) | ~28 | ~30 | ~32 | ~29 | ~31 After-Sales Service | Nationwide Dongfeng chassis warranty + lifetime upper-structure service | Chassis warranty + 1-year upper-structure service | Chassis warranty + 1-year upper-structure service | Chassis warranty + 1-year upper-structure service | Chassis warranty + 2-year upper-structure service III. Dimensional Comparative Analysis 1. Tank Capacity and Operational Efficiency Competitor A offers the largest tank capacity (~4.8 m³), but also commands the highest price. The Chengli CLW5070GSSD6’s 4.5 m³ capacity meets routine operational demands, and its optimized pipeline design delivers higher suction efficiency. In the Baoding case, the procuring party reported: “Processing 30 tons of sewage daily, the 4.5 m³ tank completes the task within three round trips—operational efficiency matches that of larger-capacity tanks.” 2. Suction Depth and Application Scenarios Both Chengli and Competitor B achieve a maximum suction depth of 8 meters, making them suitable for deep wells or underground pipelines. Competitor C