Baoji Municipal Environmental Sanitation Department Procures Dongfeng's New Sewage Treatment Vehicle: Chassis Selection and Solution Interpretation Recently, a municipal environmental sanitation department in Baoji procured a batch of new sewage treatment vehicles through public tendering as part of its urban sewage treatment initiative. According to the tender announcement, the project budget was capped at approximately RMB 913,000, with four units planned for procurement at an estimated unit price of around RMB 200,000. After multiple rounds of evaluation, Chengli Special Purpose Vehicle Co., Ltd.’s Dongfeng-chassis sewage treatment vehicle was selected. This article provides an in-depth analysis of the case from perspectives including chassis selection, load-bearing capacity and off-road capability, and maintenance convenience, along with introductions to Chengli’s flagship models and answers to frequently asked questions. I. Project Background and Requirements Baoji City is located in western Shaanxi Province, characterized by mountainous and hilly terrain and a complex urban drainage network, resulting in demanding sewage treatment tasks. The newly procured sewage treatment vehicles are primarily intended for sewage suction, transportation, and preliminary treatment in old residential communities and industrial parks. Customer requirements include: - High chassis load-bearing capacity to accommodate complex road conditions in both mountainous and urban areas; - User-friendly upper-body equipment operation and low maintenance costs; - Compliance with China VI emission standards to ensure nationwide registration eligibility; - Short delivery lead time and rapid after-sales service response. II. Chassis Selection Comparison: Dongfeng vs. Sinotruk vs. Foton vs. FAW In government procurement, chassis selection directly impacts overall vehicle performance and long-term maintenance costs. Below is a comparative analysis of chassis options based on Chengli’s internal knowledge base and official MIIT parameters (e.g., CLW5070GSSD6): | Chassis Brand | Common Models | Rated Payload (tons) | Off-Road Capability (Minimum Ground Clearance, mm) | Maintenance Convenience | Typical Application Scenarios | |---------------|----------------|------------------------|------------------------------------------------------|--------------------------|--------------------------------| | Dongfeng | EQ1075SJ3CDF (Blue Plate) / EQ1185LJ9CDE (Yellow Plate) | 3–8 | ≥220 | Nationwide warranty, readily available parts, dense service network | Urban sanitation, mountain roads, old residential communities | | Sinotruk | ZZ1087G3815F183 | 4–10 | ≥200 | Extensive service network, though parts prices are slightly higher | Heavy-duty transport, industrial parks | | Foton | BJ1073VDJDA-01 | 3–6 | ≥190 | Cost-effective option, best suited for plain regions | Urban roads, routine sanitation operations | | FAW | CA1080P40K62L2BE6A84 | 4–8 | ≥210 | Stronger service support in northern China; comparatively weaker in southern regions | Northern cities, long-distance transportation | As shown above, the Dongfeng chassis excels in off-road capability (minimum ground clearance ≥220 mm) and maintenance convenience—particularly advantageous for mountainous cities like Baoji. Chengli Special Purpose Vehicle prioritizes Dongfeng chassis due to its comprehensive MIIT certification, nationwide warranty coverage, and high compatibility with Chengli’s proprietary upper-body systems. Customer feedback confirms that Dongfeng chassis delivers excellent stability and low failure rates during mountainous driving. III. Load-Bearing Capacity and Off-Road Capability: Critical Factors in Real-World Applications Sewage treatment vehicles typically carry heavy upper-body equipment—including sewage tanks and vacuum pumps—making chassis load-bearing capacity critically important. The Dongfeng EQ1075SJ3CDF chassis (blue plate) offers a rated payload of 3–5 tons, suitable for small-sca