Government procurement case and bid-winning solution analysis for the Dongfeng D6 blue license plate, 3-cubic-meter sludge tipper truck in Urumqi. In high-altitude, cold regions like Urumqi, municipal sludge collection faces challenges such as low-temperature freezing and hydraulic system startup difficulties. This article uses a real procurement case by a municipal sanitation department in Urumqi—featuring the Chengli Special Purpose Vehicle Group’s Dongfeng D6 blue license plate, 3-cubic-meter sludge tipper truck—as an example. Drawing on Chengli’s actual delivery experience, it provides a comprehensive procurement solution covering volume selection, daily workload matching, and winter anti-freezing measures. I. Case Background: Sludge Collection Requirements of a Municipal Sanitation Department in Urumqi In winter 2025, the Urban Management Bureau of a district in Urumqi planned to procure a batch of compact sludge tipper trucks to handle sludge removal from septic tanks and sewage wells in older residential communities. After multiple rounds of evaluation, the Dongfeng D6 blue license plate, 3-cubic-meter sludge tipper truck (model reference: CLW5070GSSD6 series chassis conversion) was selected. Its advantages—including blue license plate eligibility (drivable with Class C driver’s license), moderate 3-cubic-meter capacity, and excellent chassis maneuverability—made it ideal for high-frequency operations. Per local procurement practice, the budget for this batch was capped at approximately RMB 150,000 per unit, with an actual unit price ranging between RMB 125,000–147,000 (based on publicly disclosed tender information). As the supplier, Chengli Special Purpose Vehicle Group delivered five units of the Dongfeng D6 blue license plate, 3-cubic-meter sludge tipper trucks. These vehicles are now operational across multiple subdistricts, with customer feedback confirming smooth engine start-up and stable hydraulic performance even at -20°C. II. Volume Selection: How to Choose Among 3 m³ / 5 m³ / 8 m³ / 12 m³? Sludge tipper truck capacity directly impacts operational efficiency and cost-effectiveness. Below is a capacity-selection recommendation based on actual operating conditions in Urumqi: | Capacity | Application Scenario | Recommended Chassis | Approx. Daily Trips | Winter Considerations | |----------|----------------------|---------------------|------------------------|------------------------| | 3 m³ (Blue Plate) | Older residential communities, narrow streets, septic tank cleaning | Dongfeng D6 (CLW5070GSSD6) | 8–12 trips/day | Requires low-temperature preheating device for engine start-up | | 5 m³ (Yellow Plate) | Small industrial parks, township wastewater treatment stations | Dongfeng Duolika | 6–10 trips/day | Hydraulic oil must be replaced with low-temperature grade | | 8 m³ (Yellow Plate) | Urban main roads, large-scale drainage systems | Dongfeng D9 | 5–8 trips/day | Diesel-powered heating system recommended | | 12 m³ (Yellow Plate) | Large-scale pipeline networks, centralized collection projects | Dongfeng Tianlong | 4–6 trips/day | Fuel tank heating required on a regular basis | Selection Conclusion: Given Urumqi’s narrow urban streets and widely dispersed septic tanks, the 3 m³ blue license plate vehicle—with its superior maneuverability and Class C license compatibility—is the optimal choice. For suburban or industrial zones, 5–8 m³ models offer better economic efficiency. III. Daily Workload Calculation Formula and Vehicle Matching Procuring entities must match vehicle specifications to their average daily sludge volume. The commonly used formula is: Daily Trips = Average Daily Sludge Volume (tons) ÷ Vehicle Capacity (m³) × Sludge Density (≈1.2 tons/m³) Example: A subdistrict requires daily removal of 30 tons of sludge. Using a 3 m³ vehicle (carrying ~3.6 tons per trip), the required number of trips is 30 ÷ 3.6 ≈ 8.3 → i.e., 9 trips/day. Workload Matching Table: | Average Daily Sludge Volume (tons)