Government Procurement of Dongfeng Yizhan-Series Sewage Treatment Vehicles in Kunming: Price Comparison Decision-Making and Winning Bid Analysis. In early 2026, a municipal sanitation department in Kunming planned to procure a batch of sewage treatment vehicles to address urban black-and-odorous water body remediation and emergency rainstorm drainage tasks. After reviewing quotations from multiple suppliers, the procurement team selected the Dongfeng Yizhan-Series sewage treatment vehicle manufactured by Chengli Special Purpose Vehicle Co., Ltd. This article reconstructs the entire price comparison decision-making process based on publicly available tender information and local procurement practices, providing reference for similar procurement projects. I. Procurement Background and Requirements Analysis Kunming is located on the Yunnan-Guizhou Plateau, where rainfall is highly concentrated and abundant during the rainy season, placing significant pressure on the city’s drainage network and resulting in frequent demand for sewage treatment. The procuring entity specified the following core requirements for the vehicles: 1. Efficient sewage suction, discharge, and solid-liquid separation capabilities, with a minimum daily treatment capacity of 50 cubic meters; 2. Chassis adapted to hot-humid environments, with anti-corrosion coating certified to pass salt-spray testing; 3. High-durability sealing components capable of maintaining performance under high-temperature, high-humidity conditions—reducing failure rates during intensive rainy-season operations; 4. Full official vehicle type approval (Announcement), enabling nationwide registration and annual inspection. Per local procurement practice, the budget was capped at approximately RMB 333,000 per unit, with an initial order quantity of three units. II. Multi-Brand Quotation and Price Comparison The procuring entity received three valid quotations: - Supplier A (a leading national brand): Dongfeng chassis, quoted at ~RMB 355,000/unit; - Supplier B (a regional brand): Sinotruk chassis, quoted at ~RMB 300,000/unit; - Supplier C (Chengli Special Purpose Vehicle): Dongfeng Yizhan-Series, quoted at ~RMB 317,000/unit (tax-inclusive landed price, per publicly disclosed tender information). Price Comparison Table: Brand/Model — Chassis — Quoted Price (RMB 10,000/unit) — Differentiating Configurations — Corrosion Protection Level Supplier A — Dongfeng — ~32 — Standard coating, generic sealing components — Medium-level corrosion resistance Supplier B — Sinotruk — ~27 — Basic configuration, no special protection — Basic corrosion resistance Chengli Dongfeng Yizhan-Series — Dongfeng — ~28.5 — Enhanced anti-corrosion coating, humidity/heat-resistant sealing components, wing-type tank design — High-level corrosion resistance Note: Prices are based on publicly disclosed tender data and local procurement conventions; actual landed prices may vary slightly depending on configuration adjustments. III. In-Depth Configuration Analysis The procuring entity convened a technical evaluation team to conduct detailed comparative analysis of the three quotations, revealing the following key differences: 1. Anti-Corrosion Coating Comparison Kunming’s hot-humid climate causes severe metal corrosion. Supplier A applied standard electrophoretic coating; Supplier B used conventional paint; whereas Chengli’s Dongfeng Yizhan-Series (process equivalent to CLW5070GSSD6 series) adopted a triple-layer protective system—electrophoretic coating + epoxy primer + polyurethane topcoat—and added chassis anti-corrosion wax treatment. Chengli’s technical specifications indicate its coating passes 240-hour salt-spray testing—significantly exceeding the industry standard of 96 hours. 2. Sealing Component Durability During intensive rainy-season operations, premature aging of sealing components can lead to sewage leakage. Both Suppliers A and B employed generic rubber seals, while Chengli utilized fluororubber seals resis