Government procurement case of Foton Fengjing service vehicles in Shaoxing: A practical interpretation from initial procurement to requirement iteration. Located in the Jiangnan watertown region, Shaoxing experiences a humid, hot climate with prolonged rainy seasons. Consequently, municipal sanitation departments require service vehicles not only for routine transportation but also with enhanced rust resistance, durable sealing components, and operational stability under high-load conditions. This article analyzes the procurement process of Foton Fengjing service vehicles by a municipal sanitation department in Shaoxing—from its first batch purchase to subsequent requirement iterations—and explains how Chengli Special Purpose Vehicles meets upgraded requirements through models such as CLW5040XSHB6. This case is based on authentic tender records and publicly available tender information, aiming to serve as a reference for similar procurement activities. I. First-Batch Procurement: Basic Requirements and Initial Experience In 2023, a municipal sanitation department in Shaoxing procured five Foton Fengjing service vehicles to support daily inspections, equipment transportation, and emergency response tasks. These vehicles were primarily deployed for urban road cleaning supervision, small equipment transfer, and pre-rainy-season material distribution. The procurement budget was capped at approximately RMB 287,000, with an average unit price of around RMB 50,000 (based on local procurement conventions). The vehicles featured a standard configuration: Foton Fengjing chassis equipped with a China VI-compliant engine; the body structure utilized conventional steel without specialized anti-corrosion treatment. In actual operation, these vehicles generally fulfilled routine operational needs; however, two key issues emerged: First, insufficient rust protection. With Shaoxing’s annual relative humidity exceeding 75% and rainy season lasting 4–5 months, visible corrosion appeared on vehicle chassis and body joints—especially after rainwater exposure, where rust spread rapidly. Second, poor sealing component durability. Door and cargo box seals aged and deformed within one year under humid-heat conditions, resulting in water ingress and dust intrusion, thereby compromising equipment storage quality. Additionally, during high-load operations in the rainy season—frequent wading and muddy-road driving—the engine and drivetrain experienced elevated failure rates, increasing maintenance costs by approximately 15%. These shortcomings prompted the procurement department to initiate requirement upgrades in 2024, focusing on three critical performance indicators: rust-resistant coating, sealing component material, and reliability under high-load rainy-season conditions. II. Requirement Upgrades: Rust-Resistant Coating, Sealing Durability, and Rainy-Season High-Load Adaptability Following internal evaluation, the department defined core requirements for the new procurement batch: Rust-Resistant Coating: Chassis, cargo box, and critical structural components must feature hot-dip galvanizing or composite anti-corrosion coatings, meeting GB/T 10125–2021 salt-spray test standards of ≥480 hours to withstand humid-hot environments. Sealing Component Durability: Door seals, engine compartment seals, and cargo box seals must be made of EPDM (ethylene propylene diene monomer) rubber—resistant to aging and ozone—with a service life of ≥5 years to prevent water ingress during rainy seasons. Rainy-Season High-Load Operation: Engines must incorporate splash-proof design; drivetrains must feature enhanced sealing to ensure stable operation under continuous rainfall and muddy road conditions, supporting ≥300 operational days per year. Accordingly, the procurement budget was adjusted to approximately RMB 401,000, with an average unit price of around RMB 70,000 (based on publicly disclosed tender information). During the model selection phase, the department eva