Ordos Dongfeng D6 Sludge Tipper Truck (Blue License Plate, 3 m³) – Government Procurement Case and Bid-Winning Solution Analysis In recent years, with the continuous improvement of urban drainage networks and wastewater treatment facilities, sludge collection and transportation has become a critical task for municipal sanitation departments. A municipal sanitation department in Ordos City (hereinafter referred to as the 'procuring entity') launched a procurement initiative for sludge tipper trucks in 2025, specifically targeting daily collection needs from small- and medium-sized sewage wells, septic tanks, and sludge transfer stations within the urban area. Following multiple rounds of technical evaluation and price negotiations, Chengli Special Purpose Vehicle Co., Ltd. was selected to supply its Dongfeng D6 chassis-based, blue-license-plate, 3 m³ sludge tipper truck solution. This article provides an in-depth analysis of this government procurement case from perspectives including vehicle selection rationale, daily workload calculation, and cost comparison. I. Procurement Background and Vehicle Selection Rationale The procuring entity’s existing aging fleet suffered from non-compliant emissions, excessive volume leading to poor maneuverability, and high maintenance costs. The current procurement objectives were clearly defined: blue license plate (drivable with C1 driver’s license), 3 m³ payload capacity, China VI emission standard compliance, and integrated sludge tipping functionality. According to publicly available technical parameters from Chengli’s product database (e.g., model CLW5070GSSD6 — although designated as a water-sprinkling truck, it shares the same chassis and powertrain architecture), the Dongfeng D6 chassis offers the following advantages: • Chassis Adaptability: The Dongfeng D6 employs a light-duty cargo chassis with a short wheelbase (~3,308 mm) and a small turning radius, making it highly suitable for operations on urban streets and narrow alleys. • Blue License Plate Advantage: Gross vehicle weight does not exceed 4.5 tons, enabling operation with a C1 driver’s license — thereby lowering driver qualification requirements and expanding the pool of eligible personnel. • Sludge Transport Suitability: A 3 m³ payload capacity (approx. 3-ton loading capacity) aligns well with daily handling volumes of 10–20 tons at small- and medium-sized sites, avoiding inefficiencies caused by underutilized large vehicles or frequent round trips with undersized units. • High Sealing Performance: The body features a hydraulic tipping mechanism combined with a sealed cover, minimizing odor emission and leakage during transport — fully compliant with environmental protection requirements. The tender documents explicitly required: self-tipping capability, anti-overflow devices, and China VI emission compliance. Chengli’s Dongfeng D6 blue-license-plate, 3 m³ sludge tipper truck fully satisfies all these mandatory specifications. II. Daily Workload Calculation Formula and Matching Analysis In government procurement, appropriately matching vehicle payload capacity with actual operational workload is essential to minimize operating costs. Below is the standard formula for calculating daily workload: Daily Workload (tons/day) = Vehicle Payload Capacity (m³) × Sludge Density (tons/m³) × Daily Trips Sludge density typically ranges between 0.8–1.2 tons/m³ (depending on moisture content; 1 ton/m³ is commonly used as a representative value). Daily trip frequency depends on one-way distance and loading/unloading time. For the Ordos procuring entity, the operational scenario is as follows: • One-way transport distance: Average 15 km from urban sewage wells to treatment plant • Time per trip (including loading, transit, and unloading): ~1.5 hours • Daily working hours: 8 hours (including breaks) • Maximum daily trips: 5 trips (8 hours ÷ 1.5 hours/trip ≈ 5.3 trips) Applying the formula: Daily Workload = 3 m³ × 1 ton/m³ ×