Guilin National VI Dongfeng Sewage Treatment Vehicle Government Procurement Case and Bid-winning Solution Analysis. Guilin, renowned as 'the finest landscape under heaven', experiences high humidity, frequent rainfall, and prolonged rainy seasons. Consequently, municipal sanitation departments impose stringent requirements on equipment’s anti-corrosion performance and sealing component durability when procuring special-purpose vehicles. Recently, a municipal sanitation department completed the procurement of a batch of National VI Dongfeng sewage treatment vehicles with a 3308 mm wheelbase. Chengli Special Purpose Vehicle Co., Ltd. secured the bid with its proven solution. Based on publicly available tender information and local procurement practices, this article analyzes the core elements of this case and explores operational strategies for both winter conditions and humid-hot environments—providing you with a practical procurement reference. Project Background and Procurement Requirements The procuring entity is a municipal sanitation department in Guilin City, primarily utilizing these vehicles for emergency response and routine maintenance of urban sewage networks and low-lying areas. The project budget is controlled within approximately RMB 1.655–2.206 million (per publicly disclosed tender information), requiring multiple National VI emission-compliant sewage treatment vehicles built on chassis with a 3308 mm wheelbase. Key requirements include: - Humid-Hot Resistance: Given Guangxi’s high annual humidity, vehicles must feature highly effective anti-corrosion coatings and corrosion-resistant design to prevent rusting and corrosion of critical components such as the chassis frame and tank body. - Sealing Component Durability: Under frequent rainy-season operation, hydraulic systems and suction piping seals must resist aging caused by humid-hot conditions, minimizing maintenance frequency. - High-Load Performance: Due to concentrated rainfall during Guilin’s rainy season and resulting high operational intensity, equipment must sustain continuous high-load operation while ensuring efficient drainage. Bid-Winning Solution Analysis: Chengli Sewage Treatment Vehicle Chengli Special Purpose Vehicle’s solution is built upon the Dongfeng chassis with a 3308 mm wheelbase, model CLW5070GSSD6 (as per MIIT announcement parameters), equipped with a National VI compliant powertrain aligned with Guilin’s environmental policies. Key highlights of this solution include: 1. Anti-Corrosion Coating and Corrosion-Resistant Design To address Guilin’s humid-hot environment, Chengli applies full-vehicle electrophoretic coating; anti-rust primer and topcoat are applied to the tank and critical chassis components, supplemented with galvanized protective layers. Field experience shows that five water-sprinkling and fog cannon vehicles previously delivered to an industrial park in Guangdong received outstanding customer feedback regarding anti-corrosion performance—with zero rust-related complaints. 2. Enhanced Sealing Component Durability Hydraulic systems and suction pipelines utilize rubber sealing components specifically engineered for humid-hot environments, incorporating dual-lip seal structures to significantly reduce leakage risks caused by prolonged rainwater immersion. Reference data from four street cleaning and vacuum-suction vehicles deployed in Sichuan’s municipal sector indicate a ~30% extension in sealing component service life under humid-hot conditions. 3. High-Load Operational Capability The sewage treatment vehicle is equipped with a high-power vacuum pump and separation system, achieving a single-operation processing capacity exceeding 8 m³/hour—meeting Guilin’s urgent drainage demands during the rainy season. The chassis offers nationwide warranty coverage, while the superstructure is backed by lifetime service support, ensuring worry-free after-sales service. Data Comparison: Chengli Solution vs. Market Competitor The tabl