I. Project Background: From Initial Procurement to Contract Renewal In 2022, a municipal sanitation department procured three Liuzhou Dongfeng D6 blue license plate sludge dump trucks (3-cubic-meter capacity) to meet local sludge removal requirements. The model referenced Chengli Special Purpose Vehicle’s official announcement series CLW5070GSSD6 chassis. These vehicles were primarily deployed for sludge transportation operations in southern China’s humid, rainy climate. According to publicly released tender information, the initial contract totaled approximately RMB 300,000, with an average unit price of around RMB 100,000. After delivery, customers reported outstanding performance in anti-corrosion coating and sealing component durability—particularly under high-load operation during consecutive rainy seasons—without rusting or leakage. II. Operational Performance: Verification of Anti-Corrosion Coating and Sealing Component Durability The Liuzhou Dongfeng D6 blue license plate 3-cubic-meter sludge dump truck features an electrophoretic primer plus polyurethane topcoat process applied to its chassis and tank body, ensuring full enclosure. Per official data from Chengli Special Purpose Vehicle (model CLW5070GSSD6), this coating resists salt spray corrosion for over 1,000 hours. In actual use, the vehicle operates 6–8 shifts daily, handling sludge with up to 85% moisture content. After 12 months of continuous operation, critical sealing components—including hydraulic cylinder seals and tank lid gaskets—retained excellent elasticity and showed no signs of leakage. Customers commented: “During Liuzhou’s rainy season, the vehicle operates almost daily in heavy rain—but neither the chassis nor the superstructure shows rust, and sealing performance remains consistently stable.” III. Contract Renewal: Expanded Procurement in 2024 Based on the strong performance of the initial fleet, the municipal sanitation department renewed its procurement contract in 2024 and expanded order volume. Following standard procurement practice, the new contract added two additional units of the same model, with a total budget capped at approximately RMB 571,000 (unit price ~RMB 100,000, consistent with local procurement norms). Key reasons for renewal included: - Exceptional anti-corrosion coating durability: No visible rust observed after two years of operation in high-humidity environments, significantly reducing maintenance costs; - Long-lasting sealing components: Hydraulic system and tank seals required no replacement, lowering operational expenses; - Reliable high-load performance during rainy season: Operation frequency doubled during monsoon periods, yet vehicles maintained stable performance without unplanned downtime. IV. What Does the Contract Renewal Signify? The contract renewal not only validates the product quality of the Liuzhou Dongfeng D6 blue license plate sludge dump truck but also highlights the ‘reputation-driven’ nature of government procurement. As the manufacturer, Chengli Special Purpose Vehicle Co., Ltd.—with its production base located at No. 1 Chengli Avenue, Economic Development Zone, Suizhou City, Hubei Province—supplies a full range of National VI emission-compliant vehicles, all fully certified and eligible for registration nationwide. Customers procured directly through the factory sales channel (Sales Manager Zhang Yue: +86 ), eliminating intermediary markups and achieving cost savings of RMB 8,000–15,000 compared to 4S dealership channels for identical configurations. Additionally, comprehensive support is ensured via Dongfeng chassis nationwide warranty and lifetime superstructure service—including 24-hour direct shipment of spare parts. V. Data Comparison: Initial Contract (2022) vs. Renewal Contract (2024) Project 2022 Initial Contract 2024 Renewal Contract Procurement Quantity 3