Qingdao Sinotruk Sludge Self-Dumping Truck (24 m³) Government Procurement Case: A Comprehensive Solution Overview from Tendering to Delivery. In the municipal sanitation sector, sludge transport trucks are classified as special-purpose vehicles. Particularly in coastal cities like Qingdao, sludge removal operations at wastewater treatment plants and drainage networks impose stringent requirements on transport efficiency, sealing performance, and regulatory compliance. In the first half of 2025, a district-level municipal sanitation department in Qingdao publicly tendered for a batch of Sinotruk-based sludge self-dumping trucks, specifying a cargo box capacity of approximately 24 m³, China VI emission standard compliance, and a hydraulic top-cover sealing system. Ultimately, Hubei Chengli Special Purpose Vehicle Co., Ltd. (hereinafter referred to as 'Chengli') delivered six units of the CLW5310ZWXZ6 sludge self-dumping trucks, which are currently performing well in service. This article analyzes this case in detail, deconstructs the end-to-end procurement process, and provides recommendations for cross-regional replication. I. Background and Requirements Analysis As a sub-provincial city, Qingdao’s urban drainage network spans over 4,000 kilometers, generating approximately 120,000 tons of sludge annually through routine desilting operations. These six newly procured sludge self-dumping trucks are primarily deployed for transporting sludge from wastewater treatment plants to designated disposal sites, covering a one-way distance of about 35 km, with a minimum daily transport capacity requirement of 150 tons. The procuring entity explicitly stipulated several mandatory technical specifications in its tender documents: - Chassis Brand: Sinotruk HOWO or equivalent quality; wheelbase: 1,800 + 4,600 + 1,350 mm - Engine: China VI-compliant diesel engine; rated power ≥ 280 kW - Cargo Box Volume: ≥ 24 m³, rectangular structure, equipped with a hydraulic folding top cover - Dumping Angle: ≥ 45°; floor plate thickness ≥ 8 mm - Official Model Number: Must be listed in the MIIT (Ministry of Industry and Information Technology) Vehicle Announcement Catalog, enabling nationwide registration According to publicly available tender information, the project budget was capped at approximately RMB 1.869 million (approx. RMB 280,000 per unit), inclusive of vehicle purchase tax, first-year insurance premium, license plate registration fee, and initial maintenance service. Chengli’s response emphasized the strong alignment between the official announcement parameters of the CLW5310ZWXZ6 model and the client’s specific requirements. II. Key Technical Parameters and Selection Rationale The CLW5310ZWXZ6 is a sludge self-dumping truck developed by Chengli based on the Sinotruk HOWO chassis, with MIIT announcement number ZZ3317V4667F1. Core technical specifications of this model are as follows: | Item | Parameter | |--------|-----------| | Chassis Model | ZZ3317V4667F1 (Sinotruk HOWO) | | Engine | WP10H400E62, China VI, 400 hp | | Wheelbase (mm) | 1,800 + 4,600 + 1,350 | | Cargo Box Volume (m³) | 24.5 (officially announced value) | | Dumping Angle (°) | 47 | | Hydraulic System | Dual-cylinder lifting system with synchronized top-cover actuation | | Body Material | Q345 manganese steel; floor plate thickness: 8 mm; side plates: 6 mm | | Curb Weight (kg) | 15,500 | | Gross Vehicle Weight (kg) | 31,000 | | Emission Standard | China VI | The selection of a 24.5 m³ capacity—rather than the nominal 24 m³—was driven by Qingdao’s local regulation requiring that the sealed top cover must not extend beyond the outer edges of the cargo box when fully closed. The 24.5 m³ design thus optimally balances transport efficiency while remaining within legal dimensional limits. Additionally, the 400 hp engine ensures stable performance under full-load climbing conditions—particularly important given Qingdao’s hilly terrain in certain districts. III. Tender Response and