Jingzhou Dongfeng Double-Cab Sludge Suction Truck (Blue License Plate, 3 m³) Government Procurement Case: Interpretation of Vehicle Selection Criteria and Winning Bid Solution. In urban drainage network maintenance, sludge suction trucks are indispensable equipment. Recently, a municipal sanitation department in a district of Jingzhou City, Hubei Province (hereinafter referred to as the 'Jingzhou Unit') launched a procurement program for sludge suction vehicles to address drainage system blockages in aging residential communities and main roads. After multiple rounds of technical evaluation and market price comparison, the Dongfeng double-cab blue license plate sludge suction truck (3 m³) was selected, with Chengli Special Purpose Vehicle Co., Ltd. supplying the vehicles. This article analyzes the logic behind this procurement case from perspectives including tank capacity selection, daily operational volume calculation, and budget control, providing reference for other municipal authorities. I. Procurement Background and Requirements Analysis The Jingzhou Unit oversees approximately 120 km of drainage pipelines, over 60% of which are aging infrastructure. Annually, silt-induced waterlogging complaints average around 30 cases. Existing sludge removal equipment primarily consists of manual cleaning tools and a limited number of outdated vacuum trucks—resulting in low efficiency and non-compliant emissions. In 2025, the unit plans to upgrade its fleet to specifically resolve the following issues: • Complex operating environments: Vehicles must handle both narrow alleyways in older urban neighborhoods (width < 4 meters) and major thoroughfares (width 8–12 meters). • Environmental compliance: Must meet China VI emission standards and qualify for operation under a Class C driver’s license (blue license plate), lowering driver qualification requirements. • Cost control: Budget strictly capped at approximately RMB 339,000 (per publicly disclosed tender information), requiring individual vehicle cost not to exceed RMB 120,000. II. Tank Capacity Selection: Why Is 3 m³ the 'Optimal Ratio'? The final selection of a 3 m³ capacity sludge suction truck was no coincidence. Based on official parameters of Chengli models such as CLW5070GSSD6 and practical operational modeling, the 3 m³ tank demonstrates outstanding performance across the following dimensions: 1. Matching Between Capacity and Operational Volume In urban drainage sludge removal, a single operational cycle—including manhole opening, sludge suction, transportation, and discharge—typically takes 1–2 hours. For inspection wells routinely maintained by the Jingzhou Unit, average sludge accumulation per well is approximately 0.5–1.0 m³. A 3 m³ tank can clear 3–5 wells per cycle, minimizing frequent return trips for discharge and significantly improving efficiency. 2. Chassis Compatibility and Maneuverability 3 m³ sludge suction trucks commonly utilize blue license plate chassis from Dongfeng or Foton, featuring short wheelbases (~2,800–3,300 mm) and small turning radii—enabling flexible operation even in narrow lanes of aging neighborhoods and urban villages. Compared to 5 m³ or 8 m³ models, 3 m³ vehicles typically maintain an overall length under 5.5 meters, better adapting to complex road conditions. 3. Budget Alignment and Configuration According to Chengli Special Purpose Vehicle’s 2026 tax-inclusive landed price reference, blue license plate 3 m³ vacuum trucks (sludge suction trucks) range from RMB 107,000 to RMB 136,000. By contrast, 5 m³ models start at over RMB 140,000. Within tight budget constraints, the 3 m³ model delivers exceptional value-for-money. III. Daily Operational Volume Calculation Formula and Matching Table To assist procurement units in scientifically evaluating vehicle efficiency, we provide the following daily operational volume calculation formula and matching table—based on MIIT official announcement parameters and real-world operational data: Daily Oper