Case Study and Bid-Winning Solution Analysis for Blue License Plate, 5-Cubic-Meter Dongfeng Single-Cab Sewer Cleaning Trucks in Hohhot Hohhot’s winter temperatures frequently drop below -20°C, posing severe challenges to municipal pipeline cleaning operations. In 2025, a municipal sanitation department launched a framework procurement program for blue license plate, 5-cubic-meter sewer cleaning trucks, with an overall budget capped at approximately RMB 300,000 and unit price ranging from RMB 111,000 to 130,000 (based on publicly available tender information). This article uses Chengli Special Purpose Vehicles’ Dongfeng single-cab chassis-based sewer cleaning truck as a case study to detail the framework procurement process, order-triggering mechanism, and tailored solutions for extreme cold-region operational requirements. I. Framework Procurement Background and Requirements Analysis In accordance with local procurement practices, this department adopted a framework procurement approach for specialized vehicles for the first time. Key technical and operational requirements included: • Cold-Weather Starting Performance: The vehicle must start reliably without preheating at -25°C; the engine must be equipped with a low-temperature starting assistance system. • Low-Temperature Hydraulic System Stability: The hydraulic system must maintain sealing integrity at -20°C; hydraulic hoses must remain flexible and non-brittle, and hydraulic cylinders must operate smoothly. • Winter Maintenance Program: Provision of dedicated maintenance services from November to March each year, including replacement of low-temperature hydraulic oil and antifreeze, plus comprehensive hose and piping inspections. • Blue License Plate Compliance: Curb weight and gross vehicle weight rating (GVWR) must not exceed 4.5 tons, enabling registration under China’s blue license plate classification and operation by drivers holding a Class C driver’s license. Chengli Special Purpose Vehicles’ Dongfeng single-cab chassis model CLW5040TQZD6 (based on the Dongfeng light-duty cab-over chassis) fully satisfies all the above requirements. The model is fully certified and listed in the 350th batch of the MIIT Vehicle Announcement, ensuring nationwide registration eligibility and routine annual inspection compliance. II. Shortlisting Process and Technical Requirements Framework procurement consists of two phases: prequalification review and substantive responsiveness evaluation. Chengli Automotive successfully qualified based on the following competitive advantages: • Localized Service Network: An authorized service station is established in Hohhot, with a commitment to respond to emergency winter repairs within 24 hours. • Complete Regulatory Certification: Model CLW5040TQZD6 has passed China VI emission certification, meeting local environmental compliance standards. • Transparent Configuration: No bundled pricing packages; all hydraulic components, chassis specifications, and superstructure parameters are fully disclosed and verifiable. During the technical evaluation phase, the review panel placed particular emphasis on the “Low-Temperature Performance Test Report.” Third-party test data provided by Chengli demonstrated that: (1) the hydraulic system exhibited zero seal leakage in the hydraulic cylinders at -25°C, with hydraulic hose pressure loss less than 5%; and (2) the engine was equipped with a 12V glow plug and low-temperature battery, achieving cold-start times of no more than 3 seconds. III. Order Triggering Mechanism and Delivery Process Upon signing the framework agreement, orders are triggered via a “demand-driven ordering” mechanism. For example, a district urban management bureau submitted an order for two sewer cleaning trucks in November 2025, at a unit price of approximately RMB 102,000 (per publicly available tender references); Chengli completed delivery within 15 days. The specific workflow is as follows: • The procuring entity submits a