I. Case Background: Municipal Sewage Treatment Upgrade Requirement in Quanzhou In Q3 2025, a municipal sanitation department in Quanzhou City, Fujian Province (hereinafter referred to as the 'Purchaser') issued a public tender for a batch of yellow-plate sewage treatment vehicles to address sewer network desilting and emergency response needs within its jurisdiction. The project budget was capped at approximately RMB 3.722 million, with plans to procure multiple units of the 3308-type yellow-plate sewage treatment vehicle (reference chassis model: Dongfeng series; official parameters available for similar models such as CLW5180GSSD6), intended for routine pipeline cleaning, emergency flood drainage during rainy seasons, and sewage transfer from industrial parks. In accordance with local procurement practices, the Purchaser explicitly specified requirements regarding corrosion resistance, sealing component durability, and high-load operational capability under hot-humid environmental conditions. Quanzhou is located along the southeastern coast and features a subtropical maritime monsoon climate, characterized by high annual humidity and frequent rainfall. This hot-humid environment poses greater challenges to specialized vehicles’ chassis anti-rust coatings, tank sealing components, and electrical systems. Specifically, the tender documents emphasized two key requirements: 'vehicles must feature anti-rust coating treatment' and 'sealing components must have an aging-resistance service life of no less than five years', ensuring stable performance over a 10-year operational lifespan. II. Total Cost of Ownership (TCO) Analysis: 5-Year / 8-Year / 10-Year Lifecycle Costs In government procurement, comparing only the initial vehicle purchase price is often insufficient. Purchasers place greater emphasis on the Total Cost of Ownership (TCO), which includes acquisition cost, operating costs (fuel/electricity, labor, insurance), maintenance costs (routine servicing, major overhauls), and residual value depreciation. Below is a TCO analysis for the 3308 yellow-plate sewage treatment vehicle, based on product data provided by Chengli Special Purpose Vehicle Co., Ltd. (e.g., CLW5180GSSD6 and similar models) and adapted to Quanzhou’s hot-humid environmental conditions. (A) Acquisition Cost According to publicly disclosed tender information, the unit price of Chengli’s 3308 yellow-plate sewage treatment vehicle (equipped with Dongfeng chassis meeting China VI emission standards) ranges between RMB 350,000–420,000. The Purchaser plans to acquire eight units, with the total budget capped at RMB 3.722 million. As a direct manufacturer, Chengli eliminates intermediaries—delivering cost savings of approximately RMB 8,000–15,000 per unit compared to 4S dealership channels. Based on local procurement practice, the all-inclusive landed price (including registration, insurance, and first-year maintenance) amounts to approximately RMB 429,000 per unit. (B) Operating Costs (5-Year / 8-Year / 10-Year) Operating costs primarily comprise fuel expenses, labor costs, and insurance fees. Estimates are based on Quanzhou’s local fuel prices and wage levels: Fuel Cost: Average daily operational mileage is ~80 km; fuel consumption is ~20 L/100 km; annual operating days total ~300; annual fuel cost per unit is ~RMB 58,000 (fuel price assumed at RMB 8.5/L). Labor Cost: Each vehicle is staffed with one driver and one operator, with combined annual salaries (including social insurance contributions) totaling ~RMB 100,000. Insurance & Miscellaneous Fees: Annual insurance premium is ~RMB 12,000; annual inspection and other administrative fees amount to ~RMB 3,000. In summary, average annual operating cost per unit is ~RMB 173,000. Cumulative operating costs over 5 years total ~RMB 865,000; over 8 years ~RMB 1,384,000; and over 10 years ~RMB 1,730,000. (C)