Case Study and Bid-winning Solution Analysis of the Chengli EHY5045TWCE6 Sewage Treatment Vehicle (Model 3308) in Changchun Government Procurement In government procurement across northern China—especially for sanitation and emergency support vehicles—performance under low-temperature winter conditions is often the decisive factor in project success. This article analyzes, through a representative Northeast China case, the end-to-end procurement process adopted by a municipal sanitation department for the EHY5045TWCE6 sewage treatment vehicle (Model 3308), covering pre-tender preparation, technical specification drafting, and how Chengli Special Purpose Vehicles supported the bidding process with compliant documentation—aiming to provide procurement entities with an actionable, field-tested implementation guide. I. Pre-Tender Preparation: Addressing Key Winter Challenges in Northern Regions A municipal sanitation department planned to procure a batch of sewage treatment vehicles for urban drainage pipe maintenance and emergency cleaning operations. Following local procurement practices, the budget was capped at approximately RMB 401,000 per unit, with a total quantity of two units. Prior to tendering, the department conducted thorough needs assessment—with particular emphasis on the following three core requirements: 1. Freeze-Resistant Starting Performance Changchun’s winter temperatures frequently drop below −20°C; therefore, reliable vehicle startup under such conditions is essential. The procurement specifications explicitly required: (a) engine equipped with a preheating system; (b) battery capable of cold-weather starting, with minimum cranking current ≥ 600 A. For the EHY5045TWCE6 model, Chengli Special Purpose Vehicles supplied a Dongfeng chassis with factory-installed cold-start assistance, ensuring normal operation down to −25°C. 2. Low-Temperature Hydraulic System Stability Sewage treatment vehicles rely heavily on hydraulic systems for wastewater suction/discharge and pipeline cleaning. At low temperatures, increased hydraulic oil viscosity can cause sluggish system response. The procurement specifications mandated use of low-temperature hydraulic oil (pour point ≤ −35°C), plus integrated heating or thermal insulation devices. In its bid proposal, Chengli confirmed that this model features a double-layer insulated hydraulic oil tank and standard hydraulic oil preheater—ensuring full hydraulic functionality even at −30°C. 3. Winter Maintenance Plan Beyond equipment performance, the procuring entity also prioritized long-term operational cost efficiency. The tender documents required bidders to submit a comprehensive winter maintenance plan—including antifreeze replacement intervals, battery maintenance recommendations, and a winter-specific hydraulic system inspection checklist. Chengli provided a detailed “Winter Operation & Maintenance Manual” in its bid submission and committed to lifelong upfit service and 24-hour direct shipment of spare parts—significantly reducing the buyer’s post-purchase concerns. II. Drafting Technical Specifications: A Practical Example Using the EHY5045TWCE6 Model The technical specification document forms the core of tender documents—and directly determines supplier responsiveness quality. Below is a sample technical specification drafted based on actual procurement requirements and aligned with the official parameters of Chengli’s EHY5045TWCE6 model—highlighting key adaptations for northern climates: Key Technical Parameter Comparison Table for the EHY5045TWCE6 Sewage Treatment Vehicle (Based on Public Tender Information) Parameter Item | Procurement Requirement | Chengli EHY5045TWCE6 Response Chassis Model | Dongfeng or equivalent domestic brand | Dongfeng EQ1045SJ3CDF (factory-authorized) Engine Power | ≥ 80 kW | 85 kW (China VI emission standard)