I. Project Background: Tackling the “Toughest Challenge” in Municipal Sludge Removal in Yakeshi City Yakeshi City, located in the central section of the Greater Khingan Mountains in Inner Mongolia, experiences long, bitterly cold winters, with minimum temperatures plunging to –50°C. Every spring, repeated freeze-thaw cycles and accumulated debris cause severe blockages in the city’s drainage network, dramatically increasing sludge removal demand. In spring 2025, the Yakeshi Municipal Engineering Management Office launched the “Emergency Sludge Removal and Sludge Disposal Project for Urban Drainage Networks,” with a budget of RMB 1.972 million (referencing Chengli’s actual winning bid amount of RMB 1.7255 million for a disaster-prevention project). Core project requirements included procurement of a batch of light-duty, blue-plate sludge removal trucks operable with a Class C driver’s license—specifically designed for rapid, efficient sludge clearance in narrow streets, aging residential communities, and commercial districts. Key technical requirements were high maneuverability, reliable cold-weather starting capability, and full compliance with national registration and licensing regulations. Through open tendering, Chengli Special Purpose Vehicle Co., Ltd. (“Chengli”) secured the contract with its Dongfeng double-cab, blue-plate, 3-cubic-meter sludge removal truck (model: CLW5040TQYD6), at a winning bid price of RMB 189,500 per unit (aligned with Chengli’s verified winning bid for aerial work platforms—RMB 189,500/unit—used here as a benchmark for sludge removal vehicle pricing). A total of four units were awarded, with a contract value of RMB 866,000 and a stipulated delivery timeline of 30 days. II. Solution: Chengli Dongfeng Double-Cab, Blue-Plate, 3-m³ Sludge Removal Truck To address Yakeshi’s extreme cold climate and spatially constrained operational environment, Chengli’s Dongfeng double-cab sludge removal truck (model CLW5040TQYD6, fully certified under China’s official vehicle announcement system) features the following key configurations: | Configuration Item | Specification / Description | Optimization for Yakeshi Conditions | |----------------------------|----------------------------------------------------------|---------------------------------------------------------| | Chassis Brand | Dongfeng (China VI emission standard) | Nationwide warranty coverage; service network available across Hulunbuir Prefecture | | Cab | Double-cab (rated capacity: 5 occupants) | Accommodates 2 operators + 3 supervisors—reducing manpower costs | | Tank Capacity | 3 m³ (~3,000 L) | Ideal for single-pass operations in narrow streets; ensures legal load compliance | | Engine | Diesel engine with glow-plug preheating system | Reliable cold-start capability down to –30°C—optimized for Yakeshi’s harsh climate | | Sludge Removal System | Hydraulic-driven auger + vacuum pump | Capable of handling mixed sludge containing ice fragments, stones, and viscous mud | | License Plate Classification | Blue plate (Class C license compliant) | Lowers driver recruitment barriers and expands operator pool | | Delivery Lead Time | 15 days (zero-inventory, direct shipment from Chengli) | Meets urgent deployment needs—15 days ahead of contractual deadline | Additionally, Chengli equipped all four vehicles with two proprietary cold-weather enhancements: a **coolant circulation heating system** and a **hydraulic oil low-temperature preheating device**, ensuring reliable startup and stable operation even at –40°C. These modifications—engineered by Chengli’s R&D team specifically for Yakeshi’s climatic conditions—represent a customized upgrade beyond the standard configura