Chengli Dongfeng D6 Sewage Treatment Vehicle (Blue License Plate) – Tangshan Municipal Government Procurement Case and Winning Solution Analysis In light-duty municipal operations, the selection of sewage treatment vehicles directly impacts operational efficiency and budget control. Recently, a municipal sanitation department launched a public tender for blue license plate sewage treatment vehicles to address cleaning requirements for small urban rivers, residential septic tanks, and low-lying water accumulation areas. After multiple rounds of evaluation and working-condition matching analysis, the Chengli-branded sewage treatment vehicle built on the Dongfeng D6 chassis was selected. This article comprehensively reconstructs the procurement decision-making process—from background and selection rationale to configuration details and FAQs—to serve as a reference for similar organizations. I. Case Background: Real Requirements in Light-Duty Municipal Operations The procuring entity is a sanitation station under a district-level urban management bureau, responsible for routine drainage maintenance, septic tank cleaning, and emergency sewage discharge within its jurisdiction. Operational environments primarily include narrow urban roads, alleyways in older residential communities, and riverside pedestrian paths—imposing high demands on vehicle maneuverability, emission standards, and operational convenience. Per local procurement practice, the budget was capped at approximately RMB 340,000, with mandatory requirements including China VI emission compliance, blue license plate eligibility (drivable with Class C driver’s license), and a curb weight not exceeding 4.5 tons. During preliminary research, multiple suppliers submitted proposals; however, Chengli Special Purpose Vehicle ultimately won the bid, leveraging the high adaptability of the Dongfeng D6 chassis and Chengli’s modular upper-body design, delivering two blue license plate sewage treatment vehicles. II. Working-Condition Matching: Selection Logic Across Three Operational Scenarios The procuring party identified three typical operational scenarios: • Light-Duty Municipal: Cleaning of small urban rivers (width ≤ 5 m) and residential septic tanks—requiring a tank capacity ≥ 3 m³, suction lift ≥ 6 m, and integrated high-pressure cleaning capability. • Heavy-Duty Industrial: Cleaning of industrial park sewage ponds and sedimentation tanks—requiring a tank capacity ≥ 8 m³, high-power vacuum pump, and automated unloading system. • Specialized Emergency Operations: Flood mitigation and low-lying area water removal—requiring an onboard generator and high-capacity sewage pump enabling independent operation. After comprehensive assessment, the procuring party determined that the primary requirement fell under the light-duty municipal category; thus, blue license plate vehicles were prioritized. The Dongfeng D6 chassis (wheelbase: 3,308 mm), with its compact dimensions, compliant curb weight, and mature China VI powertrain, emerged as the optimal choice. III. Chengli’s Tailored Solution: Dongfeng D6 Chassis + Chengli Upper Body Chengli Special Purpose Vehicle proposed the CLW5070GSSD6 model sewage treatment vehicle based on the Dongfeng D6 chassis, specifically tailored to this procurement. Key specifications are as follows: 1. Chassis Parameters • Chassis Model: Dongfeng D6 (wheelbase: 3,308 mm) • Engine: Quanchai Q23-115E60 (115 hp), China VI compliant • Transmission: 5-speed manual • Tires: 7.00R16 steel-belted radial tires • Cab: Single-row, tiltable, with air conditioning 2. Upper-Body Configuration • Effective Tank Capacity: 3.5 m³ (carbon steel with anti-corrosion treatment) • Vacuum Pump: Chengli proprietary rotary vane pump, max. suction lift: 8 m • High-Pressure Cleaning: Equipped with 20-m high-pressure hose and adjustable spray gun • Discharge System: Includes gravity drain outlet and quick-connect couplings • Control System: Electro-hydraulic control with