Government procurement case of the 3308 yellow-plate sewage treatment vehicle in Harbin: Practical insights from initial procurement to contract renewal and expansion. Located at China’s northernmost tip, Harbin experiences extreme winter temperatures below -30°C. For municipal sanitation departments, critical procurement considerations include reliable cold-weather engine start-up, stable hydraulic system performance, and convenient winter maintenance. In 2022, a municipal sanitation department (hereinafter referred to as 'the Department') procured Chengli Special Purpose Vehicles’ 3308 yellow-plate sewage treatment vehicle (model CLW5180GSSD6) for the first time. After two full winters of field operation, user feedback was highly satisfactory. In 2024, the Department decided to renew the contract and expand procurement volume. Based on this real-world case, this article provides an in-depth analysis of Chengli vehicles’ performance under extreme cold conditions and the underlying procurement rationale. Key Data Snapshot Initial Procurement Date: Autumn 2022 Model: 3308 Yellow-Plate Sewage Treatment Vehicle (CLW5180GSSD6, built on Dongfeng chassis) Initial Quantity: 5 units Contract Renewal Date: Spring 2024 Renewal Quantity: 8 units (including 1 spare unit) Budget Reference: Per local procurement practice, the budget per unit is capped at approximately RMB XX million (exact amount subject to tender documents) I. Initial Procurement in 2022: Vehicle Selection Under Stringent Conditions In 2022, sewage treatment demand surged in a district of Harbin City. Aging fleet vehicles suffered high failure rates—particularly during winter, frequently exhibiting difficult engine starts and frozen hydraulic lines. The Department issued a tender with core technical requirements including: • Cold-Weather Start Capability: Engine must start reliably within 15 seconds at -25°C without external heating assistance. • Low-Temperature Hydraulic Stability: Hydraulic oil must remain fluid at -30°C, maintaining stable system pressure and eliminating operational delays. • Winter Maintenance Plan: Supplier must provide a comprehensive winter maintenance manual covering coolant, engine oil, and hydraulic oil selection criteria and replacement intervals. • Chassis–Body Integration: Compliant with China VI emission standards; Dongfeng chassis (nationwide warranty); bodywork must withstand frequent start-stop operations. Chengli Special Purpose Vehicles won the bid with its CLW5180GSSD6 model. This vehicle features a Dongfeng chassis and a diesel engine equipped with factory-installed fuel preheating and cold-start assist systems. For the bodywork, Chengli’s engineering team optimized the hydraulic piping layout specifically for Harbin’s climate—adding thermal insulation blankets and electric heating tapes to prevent hydraulic oil solidification at low temperatures. According to publicly available tender information, the total price for the initial batch of five units was approximately RMB XX million, averaging about RMB XX million per unit. ❄️ Why Was the CLW5180GSSD6 Model Selected? This model is fully certified in the MIIT’s official vehicle announcement (Announcement No.: CLW5180GSSD6), with tank capacity, pump flow rate, and other parameters meeting Harbin’s operational requirements. Chengli offers nationwide chassis warranty, lifetime after-sales support for the bodywork, and local production in Suizhou—ensuring a delivery lead time of only 15 days, satisfying urgent procurement needs.