Case Study and Bid-winning Solution Analysis of the Wenzhou 3308 Sewage Treatment Vehicle EHY5045TWCE6 under Government Procurement In coastal cities such as Wenzhou, Zhejiang Province, humid-hot climate conditions and frequent rainfall impose stringent requirements on sewage treatment equipment. Recently, a municipal sanitation department procured the EHY5045TWCE6 sewage treatment vehicle manufactured by Chengli Special Purpose Vehicle Co., Ltd. via public tender, for urban pipeline and riverbed sludge treatment. Based on this real-world case, this article provides an in-depth interpretation across dimensions including technical parameter comparison, scenario suitability, and equipment selection logic—offering reference insights for similar procurement projects. Background and Requirements Analysis Wenzhou is located along the southeastern coast, characterized by high annual humidity and prolonged rainy seasons. The municipal sanitation department explicitly stipulated in its tender documents that the vehicle must feature strong corrosion resistance, highly durable sealing components, stable high-load operational performance, and compliance with China VI emission standards. Ultimately, Chengli’s EHY5045TWCE6 model stood out among multiple suppliers due to its advanced anti-corrosion coating technology and proven adaptability to humid-hot environments, resulting in the delivery of two units. According to publicly available tender information, the project’s total budget was capped at approximately RMB 671,000, with a unit price of around RMB 300,000. The vehicles are primarily deployed for street pipeline desilting, rainwater manhole sludge suction, and emergency river treatment—tasks requiring high operational frequency and exceptional equipment reliability. Horizontal Comparison of Five Mainstream Models To help readers understand the competitive positioning of the EHY5045TWCE6, the table below compares five commonly used sewage treatment vehicle models (including Chengli and other brands), with parameters sourced from official tender announcements and manufacturer documentation. | Model | Chassis Brand | Tank Capacity (m³) | Engine Power (kW) | Anti-Corrosion Coating Process | Sealing Material | Reference Price (RMB 10,000s) | |-------|----------------|----------------------|--------------------|----------------------------------|-------------------|------------------------------| | EHY5045TWCE6 | Dongfeng | 3.3 | 70 | Epoxy Resin + Hot-Dip Galvanizing | Fluoroelastomer High-Temperature-Resistant Sealing Strip | ~30 | | CLW5070GSSD6 | Dongfeng | 5.0 | 85 | Conventional Anti-Rust Paint | Nitrile Rubber | ~28 | | CLW5180GSSD6 | Dongfeng | 8.0 | 132 | Epoxy Primer + Polyurethane Topcoat | Silicone Rubber | ~35 | | Brand A Model | Sinotruk | 4.0 | 96 | Conventional Anti-Rust Paint | Nitrile Rubber | ~32 | | Brand B Model | Foton | 3.5 | 75 | Galvanized Steel Sheet + Anti-Rust Paint | Silicone Rubber | ~29 | Note: Prices above are based on publicly disclosed tender data and local procurement practices; actual quotations shall prevail per manufacturer. Comparative Analysis Across Key Dimensions 1. Anti-Corrosion Coating Process: The ‘Protective Charm’ for Humid-Hot Environments In high-humidity regions like Wenzhou, conventional anti-rust paint typically begins showing corrosion within 1–2 years. The EHY5045TWCE6 employs a dual-layer process—epoxy resin plus hot-dip galvanizing—with special surface treatments applied both internally and externally to the tank, achieving over 500 hours in salt-spray testing. In contrast, the CLW5070GSSD6 relies solely on conventional anti-rust paint, necessitating more frequent maintenance in coastal areas. Although Brand A offers a robust chassis, its reliance on standard paint alone may lead to increased long-term maintenance costs. 2. Sealing Component Durability: Critical for Rainy-Season Operations The EHY5045TWCE6 utilizes fluoroelastomer...