Suzhou Dongfeng D6 Sewage Treatment Vehicle (Blue License Plate) Government Procurement Case: The Configuration Pitfalls Behind Low-Bid Temptation — In 2025, a district Urban Management Bureau in Suzhou planned to procure a batch of blue license plate sewage treatment vehicles to address urban drainage network renovation and emergency sewage discharge needs. The budget was capped at approximately RMB 136,000 (per local public tender information), requiring the vehicles to perform sewage suction, solid-liquid separation, and preliminary wastewater treatment — while remaining eligible for blue license plates and operable with a Class C1 driver’s license. After multiple rounds of proposal comparison, Chengli Special Purpose Vehicle Co., Ltd.’s Dongfeng D6 chassis-based sewage treatment vehicle was ultimately selected. However, during the tender process, bid prices from participating suppliers varied significantly, with the lowest quoted price at around RMB 107,000 — nearly 20% below the market average. This raised red flags for the procuring entity. This article uses the Suzhou procurement case as an example to analyze common low-bid trap tactics and explain how Chengli won trust through transparent configurations and reasonable pricing. I. Low-Bid Traps: Three Key Risks Associated with Prices 20% Below Market Average In municipal sanitation vehicle procurement, low bids often entail high risks. Based on Chengli Special Purpose Vehicle’s experience serving over 500 municipal authorities, quotations more than 20% below the market average typically conceal the following issues: • Chassis Downgrades: Some suppliers use non-standard chassis or inventory vehicles — even low-power engines. For instance, the standard Dongfeng D6 blue license plate model (e.g., chassis model CLW5070GSSD6) is equipped with a fully domestic Changchai 115-horsepower engine; however, low-bid vehicles may substitute it with outdated engines rated under 80 horsepower, resulting in insufficient power for sewage treatment pumps. • Tank & Component Cost-Cutting: Critical components of sewage treatment vehicles — such as vacuum pumps, separators, and hydraulic systems — are often downgraded in low-bid proposals. Examples include using non-standard steel plate thicknesses (e.g., reducing tank wall thickness from 4 mm to 3 mm) or second-hand pump valves, directly compromising suction efficiency and equipment service life. • Non-Compliant Vehicle Announcements: Blue license plate vehicles face strict regulatory limits on gross vehicle weight and overall dimensions. Low-bid vehicles may rely on expired official announcements or unauthorized modifications that fail annual inspection requirements. In one documented case in a Suzhou subdistrict, a procured sewage treatment vehicle could not be registered due to discrepancies between its chassis data and the Ministry of Industry and Information Technology (MIIT) registration records. II. Configuration Downgrades: The Reality Behind Low-Bid Proposals During the Suzhou procurement process, a supplier’s RMB 95,000 proposal (referenced from publicly available tender information) appeared attractive at first glance. Yet, a side-by-side comparison with Chengli’s standard configuration clearly reveals its cost-cutting tactics. Key differences are summarized below: Comparison Item | Chengli Standard Configuration (Dongfeng D6 Chassis) | Low-Bid Downgraded Configuration ---|---|--- Chassis Model | Dongfeng D6, Changchai 115 HP engine, China VI emission standard | Suspected non-standard chassis or outdated 82 HP engine Tank Material | Q235 carbon steel; tank wall thickness: 4 mm; anti-corrosion coating applied | Ordinary steel plate; tank wall thickness: 3 mm; no anti-corrosion coating Vacuum Pump | Branded water-ring pump; air extraction rate ≥ 40 m³/h | Generic-brand pump; air extraction rate only 25 m³/h Separation System | Fully automatic solid-liquid separator; processing capacity ≥ 5 m³/h | Manual filter-screen type;