Government Procurement Case and Bid-Winning Solution Analysis for the EHY5045TWCE6 Sewage Treatment Vehicle (Model 3308) in Shenyang — Date: April 2026 | Case Source: Chengli Special Purpose Vehicle Co., Ltd. In Northeast China—particularly in northern cities like Shenyang—procurement of municipal sanitation equipment faces stringent natural environmental challenges. For instance, the Model 3308 sewage treatment vehicle (EHY5045TWCE6) must not only fulfill routine functions such as sewage suction, transportation, and preliminary treatment, but also ensure reliable freeze-resistant startup performance and hydraulic system stability under winter low-temperature conditions. Drawing on Chengli Special Purpose Vehicle’s recent government procurement experience, this article provides procurement entities with a practical, implementation-ready reference guide—covering qualification review, technical adaptation, and winter operation & maintenance solutions. I. Qualification Review: Essential Documentation Checklist and Verification Pathways In government procurement across Shenyang and surrounding regions, supplier qualifications constitute the first critical entry threshold. Based on Chengli’s project experience—including delivery of five Model 3308 sewage treatment vehicles to a district Urban Management Bureau—the following documentation is typically required: • Business License: Scope of operations must explicitly include special-purpose vehicle manufacturing and sales; • MIIT Announcement: The vehicle model (e.g., EHY5045TWCE6) must be listed in the MIIT’s “Announcement of Road Motor Vehicle Manufacturers and Products” to ensure legal registration and annual inspection eligibility; • CCC Certification: Full-vehicle compliance with China’s Compulsory Certification requirements; • Environmental Compliance: Public disclosure of National VI emission standards; some tenders further require documentation of pollution control devices; • After-Sales Commitment Letter: Written assurance covering chassis manufacturer-backed warranty and lifelong upfit service. Verification Pathway: Procuring entities may visit the MIIT official website’s “Road Motor Vehicle Manufacturer and Product Information Query System,” entering the model number (e.g., EHY5045TWCE6) to verify its announcement status. All Chengli models currently on sale are fully announced and support nationwide registration and annual inspections. II. Key Local Considerations in Shenyang: Freeze-Resistant Startup and Low-Temperature Hydraulic Stability Shenyang’s winter temperatures frequently drop below –20°C, imposing extreme demands on sewage treatment vehicles’ engine startup capability, hydraulic oil fluidity, and pipeline freeze protection. During early-stage consultations, a municipal sanitation department explicitly stipulated: “The vehicle must pass cold-start testing at –25°C.” To address these requirements, Chengli implemented the following technical adaptations for the EHY5045TWCE6: • Freeze-Resistant Startup: Installation of low-temperature batteries and preheating systems (e.g., intake air preheaters or coolant heaters) to ensure reliable diesel engine ignition under extreme cold; • Hydraulic Stability: Use of low-temperature hydraulic oil (viscosity grade HV46), plus optimized hydraulic piping layout—reducing bends and flow resistance—to prevent oil solidification; • Pipeline Thermal Insulation: Application of thermal insulation layers to sewage tanks, suction pipelines, and valves to prevent freezing and blockages. According to publicly available tender information, two EHY5045TWCE6 units procured by a subdistrict-level environmental maintenance unit in Shenyang at the end of 2025 received positive feedback: “Even on mornings reaching –30°C, the vehicle starts instantly with one button press, and the hydraulic system operates normally.” III. Winter Maintenance Plan: Practical Recommendations to Extend Equipment Service Life For Shenyang’s winter co