In 2025, a municipal sanitation department in a district of Deyang City upgraded its requirements for urban sewage pipeline desilting and planned to procure a batch of new sewage treatment vehicles for river remediation and emergency sewage discharge. The procurement required vehicles with high-efficiency solid-liquid separation capability, mobile operation functionality, and compliance with China VI emission standards. After receiving quotations from multiple suppliers, the procuring entity conducted detailed price comparisons and configuration analyses, ultimately selecting the Dongfeng chassis-based modification solution offered by Chengli Special Purpose Vehicle Co., Ltd. This article reconstructs the bid evaluation process based on publicly available tender information and industry practices, interpreting the core logic underlying the winning bid. Procurement Background and Requirements Analysis The municipal department’s existing vacuum sewage trucks were outdated, with insufficient processing capacity and inability to handle complex sewage environments. The newly procured vehicles needed to meet the following requirements: • Chassis: Dongfeng brand, China VI-compliant, suitable for local road conditions; • Tank capacity: Not less than 8 m³, capable of handling sediment-laden sewage; • Functionality: Integrated vacuum suction, separation, and discharge capabilities, ensuring high operational efficiency; • Budget: Unit price capped at approximately RMB 319,000, aligned with local procurement conventions. During the procurement process, quotations were received from three suppliers: Chengli Special Purpose Vehicle Co., Ltd., a Hubei-based modification factory, and another out-of-province enterprise. Below is a summary of key stages in the bid comparison process. Bid Comparison Process: Price and Configuration Analysis Per local procurement conventions, suppliers submitted tax-inclusive landed prices along with detailed configuration specifications. The procuring entity compiled the following comparative table (data referenced from publicly disclosed tender information): Supplier | Chassis Model | Tank Capacity | Separation System Type | Unit Price (Tax-Inclusive) | Remarks ---|---|---|---|---|--- Chengli Special Purpose Vehicle | Dongfeng D9 (referencing announcement CLW5180GSSD6) | 8 m³ | Centrifugal separation + vibrating screen | ~RMB 265,000 | Includes lifetime service for superstructure Hubei-based modification factory | Dongfeng Dolika | 7.5 m³ | Basic filter mesh | ~RMB 240,000 | No after-sales commitment Out-of-province Enterprise B | Dongfeng Tianjin | 9 m³ | Screw extrusion-type | ~RMB 298,000 | Requires long-distance delivery with extended lead time While Chengli’s quotation ranked mid-range in terms of price, its configuration advantages were evident: it employed the fully certified CLW5180GSSD6 chassis, paired with a high-efficiency centrifugal separation system, and included a lifetime service commitment for the superstructure—significantly reducing long-term operation and maintenance costs. In-depth Configuration Comparison The procuring entity further compared critical configurations: • Separation System: Chengli’s centrifugal separation + vibrating screen design effectively handles sediment-laden sewage, achieving over 95% separation efficiency; basic filter meshes are only suitable for low-viscosity sewage and prone to clogging. Although the screw extrusion-type system offered by the out-of-province enterprise delivers high efficiency, its price exceeded the budget. • Chassis & Certification: Chengli’s Dongfeng chassis (referencing announcement CLW5180GSSD6) is fully China VI-compliant and eligible for registration nationwide; the Hubei-based factory’s chassis lacked complete certification documentation, posing potential annual inspection risks. • After-sales Service: Chengli provides nationwide Dongfeng chassis warranty coverage and lifetime superstructure service, with spare parts dispatched withi