Xi'an Dongfeng D6 Blue License Plate Sewage Treatment Vehicle Government Procurement Case and Bid-Winning Solution Analysis Background: Framework Agreement Procurement Model At the end of 2024, the municipal sanitation department of a district in Xi'an launched a two-year framework agreement procurement initiative targeting local sewage treatment and emergency dredging projects. Located in Northwest China, the region experiences an arid climate with frequent sandstorms; municipal pipelines commonly contain silt and sand, imposing higher requirements on the sealing and filtration systems of sewage treatment vehicles. According to publicly released tender information, the procurement budget was capped at approximately RMB 893,000, with plans to acquire two blue license plate sewage treatment vehicles, each priced between RMB 350,000–400,000. After evaluation, the Dongfeng D6 chassis was selected as the primary platform due to its superior off-road capability, ease of maintenance, and compliance with blue license plate (Class C driver’s license) operation requirements. Shortlisting Process: Rigorous Qualification and Configuration Requirements The shortlisting phase of the framework agreement procurement focused heavily on supplier qualifications, official product announcement parameters, and past performance records. Following local procurement conventions, suppliers were required to provide officially announced models (e.g., Chengli CLW5070GSSD6), and commit to nationwide Dongfeng chassis warranty coverage and lifetime upfit service. Chengli Special Purpose Vehicle Co., Ltd. successfully entered the candidate list, leveraging its comprehensive after-sales system—including nationwide Dongfeng chassis warranty, lifetime upfit service, and 24-hour direct parts dispatch—as well as its proven track record serving over 500 municipal sanitation units. Moreover, Chengli’s authorized dealerships in Xi’an offered cost savings of approximately RMB 8,000–15,000 compared to competitors for identical configurations, further enhancing its competitive edge. Order Activation Mechanism: From Framework Agreement to Actual Deployment Following execution of the framework agreement, orders are not issued all at once but triggered by actual operational needs. In March 2025, an environmental maintenance unit in a subdistrict of Xi’an encountered a severe pipeline blockage incident and urgently required a sewage treatment vehicle capable of suction, filtration, solid-liquid separation, and on-site discharge. Upon receiving the request, Chengli’s team delivered a blue license plate solution based on the Dongfeng D6 chassis within 48 hours. To address the region’s high sand content and frequent sandstorms, the design emphasized enhanced dust-proof sealing and improved filtration systems. Ultimately, this order was fulfilled under the existing framework agreement, resulting in the delivery of one CLW5070GSSD6 sewage treatment vehicle. Chengli’s Competitive Advantages: Adaptability Design for Desertified Environments To address common desertification and dust challenges in Xi’an and surrounding areas, Chengli implemented three targeted enhancements on this delivery model: 1. Upgraded Dust-Proof Sealing: All valves, interfaces, and tank connections feature dual-layer sealing gaskets plus integrated dust covers, effectively preventing sand ingress into hydraulic systems or piping. User feedback indicates no visible dust accumulation at sealed locations even after six consecutive hours of operation. 2. Enhanced Filtration System: The standard air filter was replaced with a high-flow desert-grade filter element, supplemented by an additional pre-filter. Maintenance intervals have thus been extended from the conventional 200 operating hours to 400 hours—significantly reducing service frequency in dusty environments. 3. Chassis Adaptability: The Dongfeng D6 chassis inherently offers high ground clearance and reinforced suspension. Combined with Chengli’s