Government procurement case and bid-winning solution analysis for the National VI Dongfeng 3308 mm wheelbase sewage treatment vehicle in Wuxi: In a public tender conducted in 2025 by a municipal sanitation department in a district of Wuxi City—targeting aging pipeline renovation and emergency sewage treatment needs—a batch of National VI Dongfeng 3308 mm wheelbase sewage treatment vehicles was procured. These vehicles are primarily used to handle sludge, blockages, and temporary sewage transfer within municipal sewer pipelines, requiring high-efficiency suction, separation, and transportation capabilities. Chengli Special Purpose Vehicle Co., Ltd. (hereinafter referred to as 'Chengli') secured the contract owing to its mature vehicle modification expertise, compliant official announcement parameters, and comprehensive after-sales service, delivering multiple customized sewage treatment vehicles. This article provides an in-depth analysis of the case from perspectives including operational condition matching, parameter comparison, solution interpretation, and frequently asked questions—offering practical reference for similar procurement projects. I. Project Background and Operational Requirements The procuring entity—the Urban Management Bureau of a district in Wuxi City—faces severe sediment accumulation and frequent urban flooding during rainy seasons in aging drainage networks across certain old urban areas. Routine maintenance requires periodic cleaning of sewage manholes and pipelines; additionally, rapid response is essential for handling temporary sewage under emergency conditions. The tender specified the following core requirements: - Chassis must comply with National VI emission standards, meeting Wuxi’s environmental regulations; - Wheelbase must be approximately 3308 mm to ensure maneuverability on narrow urban roads; - Must possess sewage suction, solid-liquid separation, and self-unloading capabilities, with a minimum continuous operation duration of 4 hours per cycle; - Complete official vehicle announcements required to ensure normal registration, annual inspection, and commercial operation. Per local procurement practice, the budget was capped at approximately RMB 398,000 (based on publicly available tender information), and bidders were required to provide full-lifecycle service support—including chassis warranty coordination and superstructure maintenance. II. Analysis of Three Operational Condition-Matching Solutions In response to this procurement scenario, Chengli leveraged its product database and prior project experience (e.g., four high-pressure cleaning & suction-sewer trucks supplied to municipal authorities in Sichuan Province) to categorize operational conditions into three types, each corresponding to distinct technical specifications: 1. Light-Duty Municipal Operation: Routine Pipeline Maintenance Targeted at cleaning sewage manholes and pipelines along urban secondary roads and residential neighborhoods—characterized by high frequency but low volume per operation. Recommended solution: Dongfeng 3308 mm wheelbase chassis paired with Chengli’s CLW5070GSSD6-type sewage treatment vehicle superstructure (reference model). This model features a tank capacity of approximately 3–4 m³, equipped with a high-pressure cleaning pump and vacuum pump, achieving suction depths up to 8 meters—ideal for rapid clearance of localized blockages. According to the official announcement parameters for CLW5070GSSD6, the vehicle’s gross vehicle weight rating (GVWR) is approximately 7 tons, kerb weight ~4.2 tons, and rated payload ~2.5 tons—complying with Blue-Plate (Class C) driver’s license requirements (B-license required in some cities). Unit price ranges between RMB 180,000–240,000 (per publicly available tender data), offering high cost-effectiveness. 2. Heavy-Duty Industrial Operation: Large-Scale Pipeline Emergency Repair Designed for industrial parks or main arterial sewer lines requiring removal of large vol