Procurement case of the EHY5045TWCE6 sewage treatment vehicle (3308 wheelbase) by a municipal sanitation department in Liuzhou: How does the blue-plate solution balance cost and performance? In southern China’s rainy regions, the operational frequency and reliability of sewage treatment vehicles directly impact drainage system efficiency and environmental safety. Recently, a municipal sanitation department in Liuzhou publicly tendered for a batch of EHY5045TWCE6 sewage treatment vehicles (3308 wheelbase) to meet local drainage network maintenance needs. Based on this public tender information, this article provides an in-depth analysis of the differences between blue-plate (C-license) and yellow-plate (B-license) models, and explains how Chengli Special Purpose Vehicle’s blue-plate solution meets customer requirements in real-world operations. Procurement Background and Requirements Analysis The municipal sanitation department is primarily responsible for desilting, unclogging, and sewage treatment of drainage networks along urban trunk roads and multiple old urban districts. Located in a subtropical monsoon climate zone, Liuzhou experiences high summer temperatures and abundant rainfall, with a long rainy season and high humidity—posing stringent requirements on equipment corrosion resistance, sealing component durability, and stability under heavy-duty operation. The target vehicle must be built on a 3308 mm wheelbase chassis, intended for routine inspection and emergency repair tasks, balancing maneuverability and operational efficiency. Tender documents specify the following key vehicle requirements: • Maneuverability Priority: The vehicle must navigate narrow streets and aging residential communities flexibly; a blue-plate model drivable with a C-license better suits daily operational needs. • Weather Resistance: To withstand hot, humid conditions, the body must feature anti-corrosion coating, and sealing components must resist aging and corrosion. • High-Load Operation: During the rainy season, equipment must operate continuously for over 8 hours; powertrain and hydraulic systems must remain stable and reliable. • Controllable Maintenance Costs: Budget must remain within reasonable limits; based on publicly available tender data, unit price is approximately RMB 150,000–200,000. Blue-Plate (C-License) vs. Yellow-Plate (B-License): Key Comparative Analysis In the 3308 mm wheelbase sewage treatment vehicle market, blue-plate (C-license drivable) and yellow-plate (B-license drivable) models are common options. The comparison below draws upon Chengli Special Purpose Vehicle’s product database (e.g., CLW5070GSSD6 technical specifications) and publicly available information: Comparison Dimension Blue-Plate C-License Solution (e.g., EHY5045TWCE6) Yellow-Plate B-License Solution (e.g., CLW5070GSSD6) Driver License Requirement C-license (for small passenger vehicles) B-license (for medium-sized buses) Gross Vehicle Weight (kg) Approx. 4,495 (upper limit for blue-plate classification) Approx. 7,360 (standard for yellow-plate classification) Wheelbase (mm) 3,308 3,308 Tank Capacity (m³) Approx. 2–3 Approx. 4–6 Driving Accessibility Operable with standard C1 license; abundant driver pool available Requires B-license drivers; higher personnel recruitment costs Annual Inspection & Road Access Simpler annual inspection; exempt from traffic restrictions in some cities Stricter annual inspection; subject to traffic restrictions in certain areas Purchase Cost (Reference Tender Data) Approx. RMB 150,000–180,000 Approx. RMB 220,000–280,000 Annual Operating Cost Lower insurance and road maintenance fees Higher insurance and road maintenance fees Applicable Scenarios Routine maintenance on urban branch roads, residential communities, and narrow alleys Main roads, large-scale pipeline networks, and high-load operations Chengli Blue-Plate Solution: EHY5045TWC