Anshan's Government Procurement Case of the New Dongfeng Sewage Treatment Vehicle: In-depth Analysis of Winter Freeze Protection Performance and Winning Bid Solution. In Northeast China, municipal sanitation equipment procurement often faces severe natural environmental challenges. Taking Anshan as an example, winter temperatures frequently drop below -20°C, imposing extremely high requirements on the vehicle’s cold-start performance, hydraulic system stability, and overall maintenance strategy. Based on a real government procurement case, this article provides an in-depth interpretation of the winning bid solution for the new Dongfeng sewage treatment vehicle, focusing on how it addresses low-temperature challenges and showcasing Chengli Special Purpose Vehicle’s reputation built through service excellence. Case Background: Winter Procurement Requirements of a Municipal Sanitation Department in Anshan In October 2024, a municipal sanitation department in Anshan issued a procurement notice for new Dongfeng sewage treatment vehicles. According to publicly available tender information, the procuring entity explicitly required the vehicles to possess the following core capabilities: • Cold-Start Freeze Protection: The engine must start successfully on the first attempt at -25°C without requiring additional preheating. • Low-Temperature Hydraulic Stability: The hydraulic system must not exhibit oil solidification, pipeline blockage, or sluggish actuation under low-temperature conditions. • Winter Maintenance Plan: The supplier must provide a comprehensive winter maintenance manual covering lubricant selection, filter replacement intervals, and freeze-protection measures. This requirement directly reflects typical pain points in sanitation equipment procurement across Northeast China. Industry experience shows that many conventional sewage treatment vehicles suffer from difficult cold starts and hydraulic system failures in low temperatures, significantly reducing operational efficiency. Consequently, the procuring entity placed exceptional emphasis on both technical specifications and after-sales service. Interpretation of the Winning Bid Solution: Technical Advantages of Chengli’s New Dongfeng Sewage Treatment Vehicle After multiple rounds of evaluation, Chengli Special Purpose Vehicle Co., Ltd. delivered approximately six units of its new Dongfeng sewage treatment vehicle (per publicly disclosed tender information). Built upon the CLW5070GSSD6 model certification, this solution underwent specialized optimization for Northeast China’s climatic conditions. Below are its key technical advantages: 1. Cold-Start Freeze Protection: Dedicated Low-Temperature Starting System The vehicle is equipped with an original Dongfeng chassis and a China VI-compliant engine, enhanced with an electric fuel preheating system and a low-temperature battery. According to Chengli’s product database parameters (e.g., CLW5070GSSD6), the engine remains fully operational and starts reliably even at -30°C—significantly exceeding the procurement requirement of -25°C. Additionally, the vehicle features an automatic fuel cutoff system to prevent fuel gelling in extreme cold. 2. Low-Temperature Hydraulic Stability: Optimized Hydraulic Circuit Design The hydraulic system—critical to suction and discharge efficiency—is a key focus area. Chengli’s solution employs imported low-temperature hydraulic oil (with a pour point below -40°C) and optimizes hydraulic piping layout by minimizing bends and joints to reduce flow resistance. Furthermore, the hydraulic reservoir is fitted with thermal insulation to ensure oil fluidity under sub-zero conditions. According to feedback from the procuring entity, the vehicle operated smoothly during Anshan’s January 2025 extreme cold event (-28°C), with no hydraulic system hesitation or jamming observed. 3. Winter Maintenance Plan: End-to-End Service Assurance For this procurement, Chengli provided a detailed winter maintenance man