Government Procurement Case of New Dongfeng Sewage Treatment Vehicle in Nanning: Contract Clause Interpretation and Solution Analysis In autumn 2025, a municipal sanitation department in Nanning, Guangxi launched a special procurement initiative targeting the remediation of urban inland rivers and black-odor water bodies. Following an open tender process, Chengli Special Purpose Vehicle Co., Ltd. delivered five units of the new Dongfeng sewage treatment vehicles. These units are primarily deployed to manage peak sewage discharge during Nanning’s rainy season and support routine river dredging and maintenance operations. Based on this real-world procurement case, this article provides an in-depth analysis covering contract terms, delivery schedule, warranty period calculation, and Chengli’s standardized service protocols—offering valuable reference for similar government procurements. I. Procurement Background and Regional Challenges Nanning lies in a subtropical monsoon climate zone, with an average annual rainfall exceeding 1,300 mm. Its hot-humid environment imposes stringent requirements on anti-corrosion performance and sealing component durability for special-purpose vehicles. In its tender documents, the municipal sanitation department specifically emphasized three technical requirements: (1) anti-corrosion coating must withstand salt-spray testing for no less than 500 hours; (2) sealing components—including tank joints and pump gaskets—must be made of aging-resistant silicone rubber suitable for hot-humid conditions; and (3) vehicles must sustain high-frequency operation during the rainy season without performance degradation. These requirements directly influenced vehicle selection and contract clause formulation. Ultimately, the procuring entity selected a hybrid solution combining Dongfeng chassis with Chengli’s proprietary superstructure—the customized CLW5180GSSD6 sewage treatment vehicle, certified under official announcement No. CLW5180GSSD6. Built upon the Dongfeng National VI-compliant chassis, the vehicle features a ~12 m³ tank capacity, a high-power sewage pump, and an automatic separation system. Each operation can treat approximately 30 tons of sewage—representing a ~35% efficiency improvement over conventional models. Leveraging its manufacturing advantages in Suizhou, Chengli committed to a strict delivery timeline. II. Interpretation of Essential Contract Clauses in Government Procurement Government procurement contracts typically include several core clauses—particularly prominent in this case: Technical Specifications and Acceptance Criteria: The contract explicitly stipulates that the anti-corrosion coating thickness shall be no less than 120 µm (per GB/T 8923.1–2011), and sealing components must be accompanied by third-party aging-resistance test reports. Chengli’s CLW5180GSSD6 model documentation already includes detailed corrosion-protection data—for instance, a dual-layer coating process comprising epoxy primer and polyurethane topcoat. Configuration Transparency: The contract prohibits bundled pricing and mandates itemized listing of brands and models for all major components—including chassis, superstructure, sewage pump, and control system. For example, the sewage pump utilizes a German-imported corrosion-resistant pump body to ensure stable performance in acidic wastewater. After-Sales Service Guarantee: The contract stipulates nationwide joint warranty coverage for the chassis through authorized Dongfeng service stations, while Chengli provides lifetime service for the superstructure. Specifically addressing Nanning’s hot-humid climate, Chengli additionally pledged free replacement—within 30 days post-delivery—of any components exhibiting rust or seal failure. Consistent with local procurement practice, the total contract value was approximately RMB 2.6 million (RMB 520,000 per unit, per publicly disclosed tender information), inclusive of transportation, operator training, and first-