Case Study: Procurement of Dongfeng D6 Blue-Plate Sludge Tipper Trucks (3 m³) by a Municipal Sanitation Department in Weihai — 2025. To address sludge transportation requirements from local wastewater treatment plants and municipal sewer networks, the Urban Management Bureau of a district in Weihai planned to procure a batch of blue-plate sludge tipper trucks. The procurement involved approximately five units, with a total budget capped at RMB 1.713 million (unit price ~RMB 300,000, per publicly available tender information). Following multiple rounds of technical evaluation and commercial negotiation, Chengli Special Purpose Vehicle Co., Ltd. was selected to supply Dongfeng D6 chassis-based blue-plate 3 m³ sludge tipper trucks. This batch of vehicles has now entered operational service; customer feedback indicates excellent maneuverability in narrow streets and industrial zones, along with efficient fuel consumption. This article uses this case as a starting point to comparatively analyze the applicability of 85 kW, 100 kW, and 120 kW engines on blue-plate 3 m³ sludge tipper trucks—covering aspects such as engine power configuration, fuel economy, and adaptability to plateau vs. plain environments—and integrates Chengli’s actual supply solutions to support government procurement decision-making. I. Project Background and Procurement Requirements Analysis The bureau routinely transports sludge with approximately 80% moisture content and a density of ~1.2 tons/m³. Single-trip distances range within 15–30 km, and operating environments include urban arterial roads, narrow alleys, and internal roads within wastewater treatment plants. Vehicle requirements include: • Blue-plate registration, drivable with a Class C1 driver’s license; gross vehicle weight ≤ 4.5 tons; • Body capacity: 3 m³, equipped with a hydraulic top-cover sealing system to prevent leakage; • Engine must comply with China VI emission standards, balancing economy and power performance; • Chassis must demonstrate high reliability under frequent start-stop operating conditions. Public tender documents explicitly stipulated a minimum rated engine power of 85 kW but did not specify an exact model. Chengli’s proposal recommends the Dongfeng D6 chassis, standard-equipped with a 100 kW diesel engine, while also offering optional 85 kW and 120 kW configurations. II. Engine Comparative Analysis: 85 kW / 100 kW / 120 kW Below are key differences among the three engine options for the blue-plate 3 m³ sludge tipper truck (based on Chengli’s product database and MIIT announcement parameters, e.g., model CLW5040ZWXD6): | Parameter | 85 kW Engine | 100 kW Engine | 120 kW Engine | |-----------|--------------|----------------|----------------| | Rated Power (kW) | 85 | 100 | 120 | | Max Torque (N·m) | ~320 | ~380 | ~450 | | Displacement (L) | 2.8 | 3.0 | 3.8 | | Emission Standard | China VI | China VI | China VI | | Recommended Application Scenarios | Plain-area urban roads, light-load operations | Mixed urban/suburban roads, standard load | Mountainous areas, plateaus, heavy-load or frequent start-stop conditions | | Fuel Consumption (Full Load, per 100 km) | ~12–14 L | ~13–15 L | ~15–17 L | | High-Altitude Adaptability (3,000 m ASL) | ~15% power loss | ~10% power loss | ~5% power loss | | Recommended Chassis | Dongfeng D6 (Light-Duty Version) | Dongfeng D6 (Standard Version) | Dongfeng D6 (Heavy-Duty Version) | 1. 85 kW Engine: Economical Choice for Plain-Area Light-Load Operations The 85 kW engine (commonly used on the Dongfeng D6 light-duty chassis) is suitable for blue-plate 3 m³ sludge tipper trucks operating in plain regions and under light-load conditions, where road gradients are minimal and traffic flow is relatively smooth.