Government Procurement Case of Yellow-Plated Sewage Treatment Vehicles in Chengdu: Selection and Winning Bid Solution Analysis under Humid and Hot Conditions. In Chengdu, Sichuan, the humid and hot climate poses severe challenges to municipal sewage treatment equipment. Particularly for yellow-plated sewage treatment vehicles—special-purpose vehicles required to operate outdoors for extended periods in high-humidity environments—the quality of anti-corrosion coatings and the durability of sealing components directly determine equipment service life and operational costs. In 2025, a municipal sanitation department in Chengdu conducted a public tender for a batch of yellow-plated sewage treatment vehicles, with Chengli Special Purpose Vehicle Co., Ltd. ultimately delivering multiple units compliant with local operating conditions. This article uses this case as its central theme to comprehensively analyze pre-tender preparations for government procurement, how to draft technical specifications, how Chengli collaborated in providing bid documentation, and includes a Frequently Asked Questions (FAQ) section to serve as a reference for procurement entities in other regions. I. Pre-Tender Preparation for Government Procurement: Focusing on Pain Points of Humid and Hot Environments In Chengdu, the rainy season is long and ambient humidity is high; sewage treatment vehicles often need to operate continuously on flooded roads or beside sewage manholes. According to local procurement practices, procuring entities must prioritize evaluation across the following dimensions prior to tender issuance: • Anti-Corrosion Coating Requirements: Vehicle chassis and upper-structure components must utilize corrosion-resistant materials—for example, electrophoretic primer plus polyurethane topcoat—to prevent rust caused by acid rain or sewage splashing. • Sealing Component Durability: Under humid and hot conditions, rubber seals are prone to aging and deformation. Therefore, procuring entities must explicitly specify fluorocarbon rubber (FKM) or silicone rubber seals with high temperature resistance and oil resistance to ensure no leakage occurs during high-load monsoon-season operations. • Monsoon-Season Operation Frequency: With abundant annual rainfall days in Chengdu, sewage treatment vehicles must support continuous operation capability; engine cooling systems and hydraulic piping must be adapted to high-temperature, high-humidity environments. Based on these considerations, procuring entities typically invite potential suppliers for technical exchanges prior to tendering. As an industry-leading manufacturer possessing 946 product data entries covering 44 categories, Chengli Special Purpose Vehicle dispatched a technical team for on-site inspection upon receiving the requirement, offering targeted chassis selection recommendations (e.g., Dongfeng, Sinotruk, or Foton chassis) and upper-structure configuration solutions. II. How to Draft Technical Specifications: Incorporating Real-Case Data Technical specifications constitute the core document in government procurement. Taking this Chengdu yellow-plated sewage treatment vehicle project as an example, the procuring entity—when drafting technical specifications—must clearly define the following key parameters and benchmark them against Chengli’s actual publicly announced models (e.g., CLW5070GSSD6): Chengdu Municipal Sanitation Department Yellow-Plated Sewage Treatment Vehicle Technical Specification Comparison (Reference: Public Tender Information) Parameter Item | Procurement Requirement | Chengli Winning Bid Solution (Reference Model) Chassis Brand | China VI emission standard; Dongfeng / Sinotruk / Foton preferred | Dongfeng Chassis (China VI) Gross Vehicle Weight Rating (GVWR) | ≥8 tons (Yellow Plate) | Approx. 8.3 tons Tank Capacity | ≥6 m³ | Approx. 6.5 m³ Anti-Corrosion Coating Standard | Electrophoretic primer + polyurethane topcoat; salt-spray resistance ≥500 hours | Compliant; third-p