Detailed Analysis of a Changzhou-Based Government Procurement Case for the Dongfeng D6 Sewage Treatment Vehicle (Blue License Plate) and Acceptance Standards In daily municipal sanitation operations, sewage treatment vehicles are highly sought-after blue-plate special-purpose vehicles due to their maneuverability and suitability for narrow-road operations. This article uses a real-world procurement case by a prefecture-level city’s municipal sanitation department — the CLW5070GSSD6 model built on the Changzhou Dongfeng D6 chassis — as a reference. It integrates official MIIT announcement parameters and Chengli Special Purpose Vehicle’s delivery procedures to provide procurement units with a comprehensive vehicle acceptance guide. If you are considering purchasing similar vehicles, please contact Zhang Yue, Sales Manager at Chengli Special Purpose Vehicle Co., Ltd. (Tel: ) or call the official hotline for detailed configurations and quotations. I. Project Background and Procurement Requirements In Q4 2025, a municipal sanitation department (hereinafter referred to as the “Procuring Entity”) planned to upgrade its sewage treatment equipment fleet, focusing on sewage suction and treatment in old residential communities and narrow alleys. Key procurement requirements included: blue license plate classification enabling operation with a Class C1 driver’s license; gross vehicle weight not exceeding 4.5 tons; tank capacity approximately 3 m³; equipped with vacuum pump and sewage separation system; chassis compliant with China VI emission standards; and nationwide warranty coverage. Following open tendering and comprehensive evaluation, the Procuring Entity selected the Dongfeng D6-chassis sewage treatment vehicle supplied by Chengli Special Purpose Vehicle Co., Ltd. Per local procurement practice, the budget for this procurement was capped at approximately RMB 143,000 per unit (based on publicly disclosed tender information), with a total order of two units. As a direct manufacturer, Chengli Special Purpose Vehicle included chassis, bodywork, transportation, and first maintenance service in its quotation — resulting in cost savings of RMB 8,000–15,000 per unit compared to procurement via authorized 4S dealerships. II. Ten Critical Inspection Items Upon Vehicle Delivery Upon vehicle arrival, the Procuring Entity organized an acceptance team comprising technical staff, end-user departments, and third-party supervision personnel. Below are the ten key inspection items verified during actual acceptance — provided as a reference for other procurement entities: 1. Chassis and Engine Verification: Confirm that the chassis is an original Dongfeng D6 product and that the engine model matches the official MIIT announcement (e.g., YCY24140-60 or CA4DB1-13E6 for model CLW5070GSSD6). 2. Tank Capacity and Material: Measure actual tank volume using calibrated measuring tools to verify compliance with the 3 m³ requirement; inspect tank wall thickness against contractual specifications (typically 4–5 mm carbon steel). 3. Vacuum Pump Performance Test: Start the vacuum pump and test maximum vacuum level (≥60%), air extraction rate, and system sealing integrity. 4. Sewage Separation System: Verify normal operation of the solid-liquid separation unit; check seal integrity at the sludge discharge outlet; confirm separation efficiency meets technical specifications. 5. Hydraulic System Inspection: Test lifting cylinders, hydraulic locks, and associated piping for leakage; verify hydraulic pump pressure meets rated specifications. 6. Electrical System and Instrumentation: Check functionality of dashboard instruments, indicator lights, and alarm systems inside the cab; confirm all controls on the rear operation panel operate correctly. 7. Tires and Braking System: Verify tire size (commonly 7.00R16 or 7.50R16); inspect brake pad thickness and check brake lines for air leaks.