Case Study and Bid-winning Solution Analysis of the Dongfeng D6 Blue-Plate Sewage Treatment Vehicle Government Procurement Project in Tianshui City — In municipal sanitation equipment procurement across Northwest China, a municipal sanitation department in Tianshui City recently completed a government procurement project for Dongfeng D6 blue-plate sewage treatment vehicles. This project involved multiple aspects including vehicle technical specifications, budget control, and after-sales service, with Chengli Special Purpose Vehicle Co., Ltd. ultimately delivering the required equipment. Based on this case, this article provides a detailed analysis of preparatory work prior to government tendering, key points in drafting technical specifications, Chengli’s bid-document coordination process, and summarizes common procurement questions — offering reference for urban management bureaus and sanitation departments nationwide. I. Pre-Tender Preparation: Clarifying Requirements and Budget Framework The first step in any government procurement project is clarifying actual requirements. In the Tianshui case, the procuring entity conducted preliminary research and established the following core objectives: • Vehicle Selection: Dongfeng D6 chassis (model reference: CLW5070GSSD6 official announcement parameters); blue license plate, drivable with Class C driver’s license; suitable for narrow urban road operations; • Functional Positioning: The sewage treatment vehicle must feature suction, solid-liquid separation, and recirculating sewage treatment capabilities; tank capacity approximately 3–4 cubic meters; • Emission Standard: Full compliance with China VI emission standards, meeting current environmental protection requirements; • Budget Control: Based on local procurement practices, unit price for blue-plate sewage treatment vehicles ranges from RMB 98,000 to 120,000; total budget capped at approximately RMB 556,000 (per publicly disclosed tender information). Through comparative evaluation of multiple suppliers, the procuring entity found that Chengli Special Purpose Vehicle offers advantages of factory-direct sales for comparable models—saving RMB 8,000–15,000 versus 4S-channel pricing—and benefits from local production in Suizhou, enabling standard-model delivery within 7–15 days to meet tight project timelines. Moreover, Chengli serves over 500 municipal sanitation entities nationwide and possesses extensive bidding experience—laying a solid foundation for subsequent documentation support. II. Drafting Technical Specifications: Key Parameters and Configuration Requirements Technical specifications constitute the core of tender documents and directly influence bid quality and final delivery outcomes. For the Dongfeng D6 blue-plate sewage treatment vehicle, technical specifications should include the following critical elements: 1. Chassis and Powertrain Parameters • Chassis Model: Dongfeng D6 series (e.g., EQ1075SJ3CDF), single-row cab with power steering; • Engine: China VI-compliant diesel engine, rated power approx. 85–95 kW, compliant with GB17691-2018 emission standard; • Wheelbase: 3,308 mm; gross vehicle weight ≤ 7,360 kg; curb weight approx. 4,200 kg; • Tire Specification: 7.00R16 steel-belted radial tires, including spare tire. 2. Superstructure and Sewage Treatment System • Tank Material: Q235A carbon steel, internally corrosion-resistant coated; capacity 3–4 m³; • Vacuum Pump: Water-ring type, maximum air extraction rate ≥ 5 m³/min; vertical suction lift ≥ 6 m; • Sewage Treatment System: Equipped with solid-liquid separator; post-separation solid moisture content ≤ 80%; treatment capacity ≥ 10 m³/h; • Control Method: Manual + electric control; equipped with liquid-level alarm device. 3. After-Sales Service Requirements • Chassis: Nation-wide Dongfeng chassis warranty; list of authorized service stations provided; • Superstructure: Lifetime after-sales service by Chengli;