Case Study and Efficiency Improvement Analysis of the Mianyang Municipal Government’s Procurement of a Dongfeng Double-Cab Blue-Plate Sewer Cleaning Truck (3 m³) In urban drainage network maintenance, sewer cleaning trucks are critical equipment for ensuring unobstructed drainage systems. This article presents a real-world procurement case involving a municipal sanitation department (hereinafter referred to as “the Department”) acquiring a Dongfeng double-cab blue-plate sewer cleaning truck (3 m³ capacity). By comparing pre- and post-deployment performance data, it demonstrates significant improvements in daily work volume, staffing requirements, and operational costs. The case draws upon publicly available tender information and local procurement practices, aiming to serve as a reference for similar organizations. Chengli Special Purpose Vehicle Co., Ltd. (hereinafter referred to as “Chengli Automobile”) served as the supplier for this procurement, providing one Dongfeng double-cab chassis-based sewer cleaning truck with a 3 m³ tank capacity, model reference CLW5070GSSD6 (parameters consistent with those published in similar official announcements). The vehicle complies with China VI emission standards, carries a blue license plate, and is operable with a Class C driver’s license—ideal for sludge removal operations in narrow urban alleys and streets. I. Comparative Performance Data Before and After Deployment Prior to deployment, the Department relied primarily on manual labor assisted by small-scale vacuum trucks, resulting in low efficiency and high operating costs. In September 2025, the Department procured the Dongfeng double-cab blue-plate sewer cleaning truck manufactured by Chengli Automobile, which officially entered service in October 2025. Key performance indicators are summarized below: | Indicator | Pre-deployment (Jan–Sep 2025 Average) | Post-deployment (Oct–Dec 2025 Average) | Change Rate | |---|---|---|---| | Daily Sludge Removal Volume (m³) | 8.5 | 11.9 | +40% | | Daily Operating Distance (km) | 15 | 22 | +46.7% | | Time per Operation (hours) | 3.5 | 2.5 | −28.6% | | Staff per Vehicle (persons) | 4 | 3 | −25% | | Monthly Operating Cost (RMB 10,000) | 2.8 | 1.9 | −32.1% | | Days of Equipment Downtime Due to Failure (days/month) | 3.5 | 1.2 | −65.7% | Note: Data sourced from the Department’s monthly operation reports and financial accounting records, anonymized and de-identified. Operating cost includes fuel, maintenance, labor, and depreciation. II. Detailed Analysis of Daily Work Volume Improvement Prior to deploying the Chengli sewer cleaning truck, the Department relied mainly on an aging vacuum truck (3 m³ capacity) supplemented by manual cleaning. Due to equipment obsolescence, each operation required multiple trips for sludge disposal, limiting the average daily sludge removal volume to only 8.5 m³. Following commissioning of the new vehicle, daily sludge removal increased to 11.9 m³—a 40% improvement. Key enhancements include: • Chassis Adaptability: The Dongfeng double-cab chassis (blue license plate) enables agile maneuvering through narrow streets in Mianyang’s historic urban core, expanding effective service coverage by 30%. • Tank Design: The 3 m³ tank, integrated with a high-pressure flushing system, allows each operation to cover more manholes—reducing return trips. • Operational Convenience: An electro-hydraulic control system enables a single operator to complete the entire process—including suction, transport, and discharge—minimizing auxiliary labor requirements. Customer Feedback: “Previously, we needed five or six round trips per day to clear just one district; now two trips suffice—and we even have time in the afternoon to support other districts.” — Fleet Manager, the Department (anonymous interview) III. Optimization of Staffing Configuration Before deployment, each sewer cleaning truck required one driver, two operators, and one assistant worker—a total of four personnel. Due