Foshan Dongfeng Single-Cab Sewer Cleaning Truck (Blue License Plate, 5 m³) Government Procurement Case: Ensuring Efficient Sewer Cleaning and Emergency Response In Guangdong Province, frequent and heavy rainfall during the rainy season makes sewer cleaning a top priority for municipal sanitation departments. Recently, a municipal sanitation department procured multiple Dongfeng single-cab sewer cleaning trucks (blue license plate, 5 m³) via government procurement to address high-frequency drainage network maintenance and emergency cleaning tasks. This article uses this case as a starting point to deeply analyze Chengli Special Purpose Vehicles’ product advantages, operational availability, and fault emergency response solutions under hot and humid conditions—providing reference for similar procurement decisions. I. Project Background and Procurement Requirements The jurisdiction of this municipal sanitation department lies in the Pearl River Delta—a region characterized by a typical hot and humid climate, with over 150 rainy days annually and frequent typhoons bringing intense rainfall. Traditional sewer cleaning equipment often suffers from rusting and aging of sealing components under high-load rainy-season operations, significantly reducing work efficiency. After multiple rounds of research and evaluation, the procuring entity selected the Dongfeng single-cab sewer cleaning truck (blue license plate, 5 m³), specifying requirements for a reliable chassis, highly corrosion-resistant upper structure, weather-resistant sealing components, and suitability for operation on narrow urban streets. According to local procurement practices, the project budget was capped at approximately RMB 313,000, with an estimated unit price of around RMB 260,000 (based on publicly available tender information). Leveraging its deep understanding of operational conditions across South China, Chengli Special Purpose Vehicles proposed a compliant blue license plate, 5 m³ sewer cleaning truck solution matching the announced model specifications. II. Operational Availability of Chengli Vehicles During High-Load Rainy-Season Operations During the first rainy season following delivery, this batch of sewer cleaning trucks accumulated over 600 operating hours—primarily clearing silted debris from storm drains, culverts, and low-lying road sections after heavy rainstorms. According to feedback from the procuring entity, vehicle operational availability remained above 95%. Only one temporary shutdown occurred due to insufficient lubrication of the driveshaft; it was quickly restored following on-site maintenance. Key advantages include: • Anti-Corrosion Coating Technology: To address southern China’s humid climate, Chengli applies a dual-layer coating system—epoxy primer plus polyurethane topcoat—to corrosion-prone areas such as the tank body and chassis. Salt-spray testing exceeds 1,000 hours, effectively inhibiting corrosion in high-humidity, coastal environments. • Sealing Component Durability: The vehicles utilize fluororubber O-rings—exhibiting excellent resistance to oil, acids, alkalis, and aging—with no leakage observed during continuous operation. Technical staff from the procuring entity noted: “Previously, domestic vehicles required seal replacement every six months; these units have operated for one full year without any issues.” • High-Load Adaptability: Equipped with a Dongfeng chassis powered by a Tier VI-compliant engine delivering ample torque, and integrated with Chengli’s hydraulic system, the trucks maintain safe oil temperatures even during eight consecutive hours of full-load operation. III. Fault Emergency Response and After-Sales Service Despite outstanding overall operational availability, two minor faults required emergency resolution: one involved slight leakage at a hydraulic hose fitting; the other entailed insufficient suction pump pressure. Upon receiving service requests, Chengli’s after-sales team dispatched original s