Government procurement case of Dongfeng Yizhan-style sewage treatment vehicle in Guilin: In-depth interpretation from a fleet management perspective. In municipal sanitation operations under southern China’s hot and humid climate, equipment durability and adaptability are critical to fleet management. A municipal sanitation department in Guilin recently procured the Dongfeng Yizhan-style sewage treatment vehicle specifically to address the challenges of high operational frequency and heavy equipment loads during the rainy season. This article analyzes the decision-making logic, equipment performance, and total cost of ownership from the perspective of the fleet management supervisor, supported by real procurement data. I. Procurement Background and Selection Considerations Guilin lies in a subtropical zone characterized by a prolonged rainy season and high humidity, resulting in heavy municipal sewage treatment demands. The department’s aging fleet frequently suffered from seal degradation and failure of anti-corrosion coatings, leading to frequent maintenance. In 2025, following an open tender process, Chengli Special Purpose Vehicle Co., Ltd. was selected as the supplier for the Dongfeng Yizhan-style sewage treatment vehicle (model reference: CLW5070GSSD6). According to the department’s fleet management supervisor, key selection criteria included: anti-corrosion coating (to withstand high temperature and humidity), seal durability (to minimize leakage risks during the rainy season), and high-load operational capability (to meet continuous multi-day rainwater treatment requirements). Chengli’s solution features an original Dongfeng chassis, enhanced corrosion-resistant finishing on the upper assembly, and wear-resistant sealing strips—ensuring long-term stable operation in humid environments. II. Dispatch Flexibility: Meeting High-Frequency Rainy-Season Operations During Guilin’s rainy season, sewage treatment vehicles must operate frequently—sometimes completing multiple suction and transport tasks across different locations within a single day. This batch of vehicles adopts a wing-type (side-opening) design, enabling rapid loading/unloading of hoses and accessories and significantly reducing dispatch time. With an optimized wheelbase (e.g., Dongfeng Xiaoduolika chassis) and small turning radius, the vehicles maneuver easily through narrow streets and residential communities. In actual use, average daily operating time is approximately 8 hours, reaching up to 12 hours during peak periods. Drivers report excellent cab visibility and an intuitive, simplified control panel layout—reducing training requirements. Dispatchers utilize the onboard GPS system to monitor real-time vehicle location and job progress, enabling efficient resource allocation. III. Fuel Consumption Monitoring Data: Economic Performance Under High Load To evaluate economic performance, the department tracked fuel consumption for the first five sewage treatment vehicles over a three-month period. Data were collected via onboard telematics systems and refueling records, eliminating human interference. Key metrics are summarized below: Fuel Consumption Monitoring Data for Dongfeng Yizhan-Style Sewage Treatment Vehicles at a Municipal Sanitation Department in Guilin (July–September 2025) Month | Avg. Daily Operating Hours (hrs) | Total Distance Traveled (km) | Total Fuel Consumed (L) | Fuel Consumption (L/100 km) | Daily Fuel Consumption (L/day) ---|---|---|---|---|--- July | 8.5 | 3,200 | 480 | 15.0 | 15.5 August | 9.2 | 3,500 | 525 | 15.0 | 17.0 September | 7.8 | 2,900 | 435 | 15.0 | 14.0 Average | 8.5 | 3,200 | 480 | 15.0 | 15.5 The data show that even under high-load rainy-season conditions (August), fuel consumption remains consistently around 15.0 L/100 km—demonstrating clear economic advantages compared to comparable models (e.g., some competitors at 16–18 L/100 km). This efficiency stems from