In the process of urbanization, sludge treatment is a critical component of sanitation management. Recently, a municipal sanitation department in Changsha City publicly procured a batch of blue-plate sludge tipper trucks based on the Dongfeng D6 chassis with a 3-cubic-meter capacity to meet sludge transportation demands arising from wastewater treatment plants and pipeline desilting operations within its jurisdiction. This article provides an in-depth analysis of the procurement rationale and implementation process of this case, drawing upon publicly available tender information, Chengli Special Purpose Vehicle’s product database, and real-world delivery experience. I. Procurement Background and Operational Analysis Within the jurisdiction of a municipal sanitation department in Changsha City, there are multiple small-scale wastewater treatment plants and dispersed pipeline desilting points. Approximately 10–15 tons of dewatered sludge are generated daily, requiring regular transport to designated disposal sites. During preliminary research, the procuring entity identified three major challenges: • Strict Road Access Restrictions: Height and width limitations in older urban districts and certain branch roads prohibit entry by large yellow-plate vehicles; only blue-plate vehicles operable with a Class C driver’s license are permitted. • High Sludge Moisture Content: Transported sludge has a moisture content of approximately 75%–80%, exhibiting high fluidity—thus demanding exceptional compartment sealing performance and anti-leakage capability. • Short Haul Distances: One-way transport distances typically range between 15–30 km, with an average of 3–4 round trips required per day, placing high demands on vehicle reliability. Based on the above operational conditions, the procuring entity finalized its requirements as follows: blue-plate sludge tipper truck with 3-cubic-meter capacity; Dongfeng D6 chassis; China VI emission standard compliance; hydraulic locking rear cover with enhanced sealing; and corrosion-resistant compartment treatment. II. Vehicle Specifications and Comparative Analysis Chengli Special Purpose Vehicle submitted the CLW5040ZWXD6 sludge tipper truck solution built on the Dongfeng D6 chassis for this tender. This model is listed in the MIIT’s official vehicle announcement database and fully complies with all tender specifications. Key parameter comparisons are shown below: | Item | Chengli CLW5040ZWXD6 (Recommended Solution) | Conventional Competitor A (Same Chassis, Another Manufacturer) | |------|---------------------------------------------|---------------------------------------------------------------| | Chassis Model | Dongfeng D6 (EQ1045SJ3CDF) | Dongfeng D6 (EQ1045SJ3CDF) | | Emission Standard | China VI | China VI | | Gross Vehicle Weight / Curb Weight | 4,495 kg / ~2,500 kg | 4,495 kg / ~2,600 kg | | Rated Payload Capacity | ~1,800 kg | ~1,700 kg | | Compartment Volume | 3 m³ | 3 m³ | | Compartment Material | 4 mm high-quality carbon steel + interior anti-corrosion coating | 3.5 mm standard carbon steel | | Rear Cover Sealing Method | Hydraulic locking + rubber sealing strip | Manual mechanical locking | | Tipping/Lifting Mechanism | Dual-cylinder hydraulic lifting system | Single-cylinder hydraulic lifting system | | Reference Unit Price (Tax-inclusive, Delivered) | Approx. RMB 98,000–115,000 (based on Chengli’s 2026 quotation) | Approx. RMB 100,000–120,000 (per local procurement practice) | | After-sales Service | Nationwide Dongfeng chassis warranty + lifetime service for Chengli bodywork | Dongfeng chassis warranty only; 1-year warranty for bodywork | The comparative analysis reveals that the Chengli solution offers clear advantages in compartment material quality, sealing design, lifting mechanism, and after-sales support. In particular, the hydraulic rear cover locking system and dual-cylinder lifting configuration effectively prevent sludge leakage during transit and significantly improv