Government Procurement Case of Dongfeng Yizhan-Style Sewage Treatment Vehicle in Ordos: Heavy-Duty Design and Solution Interpretation under High-Load Operations. In Ordos, Inner Mongolia, municipal sanitation departments process large volumes of industrial and domestic sewage daily, subjecting equipment to harsh, high-load, and highly corrosive operating conditions. Equipment fatigue management—particularly chassis and superstructure durability—has become a core procurement challenge. This article analyzes a real-world procurement case involving the Dongfeng Yizhan-style sewage treatment vehicle by a municipal sanitation department, explaining how Chengli Special Purpose Vehicles addresses these challenges through heavy-duty operational design and provides selection guidance. I. Project Background and Equipment Requirements A municipal sanitation department in Ordos faced surging industrial park sewage discharge volumes, causing frequent failures of aging equipment and severely impacting daily operational efficiency. Following an open tender process, Chengli Special Purpose Vehicle Co., Ltd. was selected to supply its Dongfeng Yizhan-style sewage treatment vehicle. Built on a Dongfeng chassis and compliant with the CLW5180GSSD6 official model certification, the vehicle features a fold-out (wing-type) body structure for rapid loading/unloading and maintenance. Per local procurement practice, the project budget was controlled at approximately RMB 350,000–400,000 (per publicly available tender information), requiring compliance with China VI emission standards, high suction lift capability, robust filtration performance, corrosion resistance, and reliable cold-start functionality down to −30°C. Chengli’s proposal—featuring nationwide OEM chassis warranty and lifetime superstructure service commitment—scored highly during bid evaluation. II. Equipment Fatigue Management under High-Frequency Operation In daily use, sewage treatment vehicles operate an average of 8–10 hours per day, with frequent start-stop cycles and full-load pumping/discharging operations. This places significant stress on chassis suspension systems, hydraulic components, and tank weld seams—the primary ‘fatigue hotspots’. Chengli implemented targeted enhancements: • Chassis Reinforcement: Utilizes Dongfeng’s factory-reinforced frame, increasing load-bearing capacity by ~15% and reducing long-term deformation risk. • Hydraulic System: Equipped with high-displacement gear pumps and corrosion-resistant sealing components to prevent leakage caused by sewage contaminants. • Tank Corrosion Protection: Internally and externally coated with epoxy resin (≥0.8 mm thickness), offering excellent resistance to acids, alkalis, and salts—extending tank service life to over eight years. Customer feedback indicates zero major failures after six months of continuous operation across the first two delivered units; maintenance frequency decreased by ~40% compared to legacy equipment. Chengli’s 24-hour direct-shipping spare parts service further ensures timely emergency repairs in remote areas. III. Heavy-Duty Operational Design Details To address Ordos’ extreme climate—severe winter cold and summer heat—Chengli integrated the following features into the Dongfeng Yizhan-style vehicle: • Cold-Start System: Includes fuel heater and battery thermal insulation sleeve, ensuring reliable engine start-up at −30°C. • High-Performance Suction System: Fitted with a water-ring vacuum pump delivering up to 8 meters maximum suction lift—ideal for deep wells and complex pipeline configurations. • Intelligent Control Panel: Integrates liquid-level sensors and overload protection to automatically trigger alarms and prevent dry-running damage to the pump. During the public tender, Chengli’s complete regulatory documentation—including the CLW5180GSSD6 model certification—and nationwide registration eligibility significantly streamlined procurement procedures. The vehicle also supports zero-invent