Case Background: Procurement Motivation of a Municipal Sanitation Department in Dongguan City. As a major manufacturing hub, Dongguan experiences frequent rainy seasons and maintains humidity levels above 80% year-round, placing immense pressure on municipal pipeline maintenance. In 2024, a municipal sanitation department (hereinafter referred to as 'the client') sought to procure a batch of sewage treatment vehicles to handle emergency dredging and sewage pumping tasks at aging urban drainage pump stations and low-lying road sections. Following multiple rounds of tendering, Chengli Special Automobile Co., Ltd. delivered several National VI Dongfeng 3308-mm wheelbase sewage treatment vehicles, including certified models such as CLW5070GSSD6. As the fleet management supervisor for the client, Mr. Li was fully involved throughout vehicle selection, trial operation, and subsequent deployment. During a follow-up interview, he stated: 'Dongguan’s hot-humid climate severely corrodes vehicle chassis and upper assemblies. Previously, our standard sewage trucks exhibited paint blistering and seal degradation within two years. This time, we selected Chengli’s vehicles primarily due to their anti-corrosion coating and durable sealing components specifically engineered for hot-humid environments.' Vehicle Configuration and Delivery Overview: These vehicles are built upon the Dongfeng 3308-mm wheelbase chassis, equipped with a National VI diesel engine, with a rated payload capacity of approximately 4–5 tons and tank volume of about 5–6 cubic meters. The upper assembly features high-strength steel plate welding, with an internal epoxy resin anti-corrosion coating; all hydraulic pipe fittings are made of stainless steel. According to publicly available tender information, the procurement price per unit was approximately RMB 150,000–180,000 (in line with local procurement norms), covering nationwide chassis warranty and lifetime service for the upper assembly. Detailed configuration lists and quotations are available from Chengli Customer Service Hotline or Sales Manager Zhang Yue at . Specification Comparison: Parameter | Chengli CLW5070GSSD6 | Competitor A (Same Class) | Competitor B (Same Class) ---|---|---|--- Chassis Wheelbase | 3308 mm | 3300 mm | 3360 mm Tank Volume | ~5.5 m³ | ~5.0 m³ | ~5.8 m³ Anti-Corrosion Treatment | Epoxy Resin + Hot-Dip Galvanizing | Standard Anti-Rust Paint | Epoxy Resin (Partial) Seal Material | Weather-Resistant Fluoroelastomer | Nitrile Rubber | Polyurethane (Prone to Aging) Emission Standard | National VI | National VI | National VI Reference On-Road Price | ~RMB 150,000–180,000 | ~RMB 170,000–200,000 | ~RMB 160,000–190,000 Fleet Management Supervisor’s Evaluation: Dispatch Flexibility Is Critical. The client’s jurisdiction includes numerous old residential communities with narrow alleys where large sewage treatment vehicles cannot enter. The Dongfeng 3308-mm wheelbase model keeps overall vehicle length under 6 meters and features a small turning radius, enabling agile navigation through urban village roads. Mr. Li commented: 'We handle 3–5 locations daily. Previously, using a 9-cubic-meter truck, some streets were inaccessible—we had to deploy hoses for remote connection, drastically reducing efficiency. Now, this vehicle can drive directly up to the manhole, eliminating the need for hose connections.' The upper assembly adopts a 'self-priming/self-discharging' design, equipped with a high-capacity vacuum pump and hydraulic tilting system. Each operational cycle takes approximately 15–20 minutes—about 30% faster than conventional suction trucks. During peak rainy season in Dongguan, the vehicle operated continuously for over 10 hours without triggering hydraulic system overheating alarms or leakage. Fuel Consumption Monitoring Data: Economic Performance Exceeded Expectations. According to the client’s