In southern coastal cities—especially in regions like Fuzhou—municipal drainage system sludge removal and maintenance is a seasonal, high-frequency task. Ahead of the rainy season, municipal sanitation departments often urgently procure sludge suction trucks for pipeline cleaning, river channel dredging, and emergency flood control. In early 2024, the Urban Management Bureau of a district in Fuzhou issued a government procurement project for 'Dongfeng Dual-Cab Sludge Suction Trucks (Blue Plate, 3 m³)', with a budget capped at approximately RMB 137,000 (in line with local procurement practices). Chengli Special Purpose Vehicle Co., Ltd. successfully delivered the vehicles, leveraging its mature product solution and reliable after-sales service. This article analyzes the vehicle selection logic, operational costs, and real-world performance of this case—from the perspective of comparing Blue Plate (C-license) versus Yellow Plate (B-license) vehicles—to provide practical reference for similar procurement needs. I. Blue Plate (C-License) vs. Yellow Plate (B-License): Core Differences in Sludge Suction Truck Selection in Fuzhou The most critical decision in sludge suction truck procurement is choosing between Blue Plate and Yellow Plate configurations. This choice not only affects driver licensing requirements but also directly impacts vehicle operating costs, traffic access permissions, and overall operational efficiency. Below is a comparative analysis based on real-world cases: Comparison Dimension Blue Plate Sludge Suction Truck (C-License Operable) Yellow Plate Sludge Suction Truck (B-License Required) Driver License Requirement C1/C2 license sufficient; standard drivers can operate B2 or higher license mandatory; higher driver training cost Vehicle Dimensions & Capacity Gross vehicle weight ≤ 4.5 tons; tank capacity approx. 3 m³—ideal for residential communities and narrow alleys Gross vehicle weight > 4.5 tons; tank capacity up to 5–8 m³—suitable for main roads and large-scale sewer networks Urban Traffic Restrictions Permitted for daytime operation in most cities—including Fuzhou—with no traffic restrictions Permits required in certain urban districts; possible peak-hour restrictions Annual Inspection & Insurance Costs Lower frequency (biennial inspection within first 10 years); lower insurance premiums Higher frequency (annual inspection); insurance premiums approx. 30–50% higher Driver Labor Cost Monthly salary for standard C-license drivers: ~RMB 5,000–6,000 (Fuzhou benchmark) Monthly salary for B-license drivers: ~RMB 7,000–9,000; significantly harder to recruit Applicable Scenarios Residential communities, schools, markets, narrow streets, emergency repairs Main roads, large-diameter sewage pipelines, riverbed dredging Based on the case of the district-level Urban Management Bureau in Fuzhou, the priority requirement was for vehicles capable of accessing aging residential neighborhoods and narrow backstreets for sludge removal operations—areas characterized by tight road widths, small turning radii, and strict noise and emission standards. Therefore, Blue Plate sludge suction trucks were the preferred choice. II. Chengli Blue Plate Sludge Suction Truck Solution: Optimized for Humid, Hot Environments Fuzhou features a typical subtropical monsoon climate—hot, humid summers with annual relative humidity consistently above 70%. This poses stringent demands on vehicle corrosion resistance and sealing component durability. Chengli’s Dongfeng dual-cab sludge suction truck (Blue Plate, 3 m³) solution incorporates targeted optimizations in the following areas: 1. Chassis & Official Announcement Parameters This model is built on a Dongfeng chassis, referencing official MIIT announcement parameters (e.g., CLW5070GSSD6 series), equipped with a China VI-compliant engine meeting Fuzhou’s environmental standards. Its compact overall dimensions and wheelbase (~3.3 m)