Interpretation of Government Procurement Cases and Winning Bid Solutions for Dongfeng Yizhan-Style Sewage Treatment Vehicles in Xi’an In the municipal sanitation sector, sewage treatment vehicles serve as core equipment for addressing pipeline blockages, emergency drainage, and black-and-odor water body remediation. Particularly in cities like Xi’an—located in Northwest China and facing desertification erosion in certain areas—the vehicle’s dustproof sealing performance and filter system maintenance intervals directly impact operational efficiency and service life. This article takes the procurement of Dongfeng Yizhan-style sewage treatment vehicles by a municipal sanitation department in Xi’an as a case study, offering an in-depth analysis of the entire process—from tender preparation and technical specification drafting to Chengli Special Purpose Vehicle’s bid support—providing actionable reference guidance for procuring entities. I. Core Pre-Tender Preparation for Government Procurement Before initiating the tender process, the procuring entity must clarify three key questions: What are the intended operational scenarios? What is the budget range? What local regulatory constraints apply? Taking Xi’an as an example, a municipal sanitation department planned to procure a batch of sewage treatment vehicles primarily for emergency pipeline clearance in aging urban networks and flood-season drainage. Based on local procurement practices, the budget was controlled within approximately RMB 388,000–450,000 per unit, referencing publicly available tender information. 1.1 Operational Scenario Alignment with Vehicle Selection Xi’an lies in the Guanzhong Plain; however, certain districts—including Lintong and Zhouzhi—feature sandy soils and prominent dust issues. Therefore, vehicles must possess high-grade dustproof sealing capabilities to prevent sand intrusion into hydraulic systems or electrical modules. The Dongfeng Yizhan chassis—featuring excellent cab sealing performance and strong off-road capability—is prioritized in local procurement. Chengli Special Purpose Vehicle has accumulated extensive modification experience for dusty environments when delivering units to customers in Gansu and Ningxia provinces—for instance, installing dual-stage air filters at engine intakes and designing hydraulic oil tanks with two-stage filtration structures. 1.2 Budget and Cost Control According to product data from Chengli’s knowledge base, the reference price for Dongfeng-chassis sewage treatment vehicles (including superstructure) ranges from RMB 421,000 to 476,000 per unit (tax-inclusive landed cost, referencing publicly available tender information). The procuring entity must clearly specify the budget ceiling in the tender documents and indicate whether transportation, training, and first-year maintenance costs are included. For example, a district Urban Management Bureau stipulated in its tender: “Budget capped at RMB 465,000 per unit, inclusive of initial filter replacement kits,” directly influencing subsequent supplier quotation strategies. 1.3 Local Regulatory Compliance The China VI emission standard is now mandatory nationwide. Xi’an enforces the strictest “China VIb” standard and imposes stringent restrictions on gross vehicle weight and dimensions. The Dongfeng Yizhan chassis (e.g., model CLW5180GSSD6) carries complete official type-approval documentation and complies with Xi’an’s vehicle registration and annual inspection requirements. The procuring entity must explicitly require bidders to submit MIIT type-approval parameters, environmental compliance lists, and vehicle conformity certificates in the tender documents. II. How to Draft Technical Specifications? Prioritizing Dustproofing and Filtration Technical specifications constitute the core of tender documents and directly determine whether the vehicle can withstand Xi’an’s desertification-prone climate. Below are three critical pain points: 2.1 Dustproof Sealing