Xining 3308 Sewage Treatment Vehicle EHY5045TWCE6 Government Procurement Case: In-depth Analysis of Tender Process and Winning Proposal. In the high-altitude city of Xining, winter low temperatures impose stringent performance requirements on special-purpose vehicles. Recently, a municipal sanitation department issued a procurement notice for the 3308 sewage treatment vehicle EHY5045TWCE6, with a budget capped at approximately RMB 331,000, planning to procure one unit for emergency sewage pipeline treatment in urban areas. This article uses the actual tender process as a framework to analyze how Chengli Special Purpose Vehicles met the purchaser’s requirements through technical responsiveness, commercial quotation, and service solutions, ultimately delivering the vehicle—and provides detailed analysis focused on users’ top concerns: freeze-resistant starting, low-temperature hydraulic stability, and winter maintenance. I. Core Requirements in the Tender Document According to publicly available tender information, the procurement project is titled 'Procurement of Emergency Sewage Treatment Vehicles for Xining Urban District', with the following five core requirements: Chassis & Powertrain: Must comply with China VI emission standards; engine power output no less than 70 kW; capable of operating under low-oxygen conditions at high altitudes; equipped with cold-start assistance devices (e.g., preheating systems). Sewage Treatment Capacity: Rated treatment capacity no less than 3 m³/h, including solid-liquid separation and wastewater purification functions; equipped with self-priming pump and sludge discharge system. Low-Temperature Adaptability: Vehicle must start and operate normally within ambient temperatures ranging from −25°C to −30°C; hydraulic system must utilize low-temperature-resistant sealing components; hydraulic oil must meet winter fluidity requirements. After-Sales Service: Chassis covered by nationwide warranty; superstructure covered by minimum 2-year warranty; spare parts guaranteed delivery to Xining urban district within 48 hours. Delivery Timeline: Delivery, acceptance, and operator training must be completed within 30 days after contract signing. The procuring entity specifically emphasized that Xining’s average winter temperature drops to −15°C, with extremes reaching −30°C; therefore, 'freeze-resistant starting performance' and 'low-temperature hydraulic stability' were designated as critical technical evaluation criteria, carrying a combined weight of up to 30% in the bid assessment. II. Chengli’s Technical Response Solution In response to the above requirements, Chengli Special Purpose Vehicles provided the EHY5045TWCE6 sewage treatment vehicle (model referencing CLW5070GSSD6 official announcement parameters), incorporating targeted optimizations: 2.1 Chassis & Powertrain System Equipped with a Dongfeng-series chassis meeting China VI emission standards; engine rated power 72 kW; integrated electronic control preheating device and intake air heating system—ensuring successful single-cycle startup even at −30°C. Per MIIT official announcement parameters, this model has passed high-altitude adaptability testing and fully satisfies operational requirements at elevations exceeding 2,200 meters, as found in Xining. 2.2 Sewage Treatment System Features an in-house developed solid-liquid separation unit and triple-stage filtration system, delivering a rated treatment capacity of 3.5 m³/h—exceeding tender requirements. The self-priming pump is constructed from stainless steel, achieving a maximum suction lift of 8 meters and capable of handling wastewater with solid content ≤15%. Tank volume is approximately 3.2 m³, sufficient for single-cycle emergency operations. 2.3 Low-Temperature Hydraulic Stability Solution The hydraulic system represents a key vulnerability during winter operation. Chengli implemented the following measures on the EHY5045TWCE6: Low-Temperature-Resistant Sealing Components: Imp