Government procurement case of National VI Dongfeng 3308 mm wheelbase sewage treatment vehicle in Yantai: Price comparison analysis and winning bid solution interpretation. In the second half of 2025, a municipal sanitation department in Yantai urgently needed to procure a batch of National VI emission-standard sewage treatment vehicles due to aging local wastewater treatment facilities and frequent pipeline blockages. The project budget was capped at approximately RMB 1.351 million, with plans to purchase three specialized vehicles for routine sewage suction, transportation, and emergency response. After comparative quotations, on-site inspections, and configuration evaluations from multiple suppliers, Chengli Special Purpose Vehicle Co., Ltd. was selected to deliver three sewage treatment vehicles built on the Dongfeng 3308 mm wheelbase chassis. This article provides a detailed breakdown of the price-comparison decision-making process, serving as a reference for similar procurement projects. Procurement Background and Key Pain Points The municipal sanitation department previously operated outdated sewage treatment vehicles compliant with National III or National IV emission standards; some units had already failed annual inspections. Newly procured vehicles must meet the National VI emission standard and feature a chassis wheelbase compatible with narrow urban streets (e.g., Dongfeng’s 3308 mm wheelbase), ensuring maneuverability in confined areas. Core requirements included: • Emission Standard: National VI — eligible for nationwide registration and annual inspection. • Chassis Requirement: Dongfeng 3308 mm wheelbase, optimized for operations in older urban districts. • Functional Configuration: Suction pump efficiency ≥10 m³/h; tank capacity ≥5 m³; equipped with high-pressure cleaning function. • After-sales Service: Nationwide warranty coverage for chassis; lifetime service support for superstructure. • Delivery Timeline: Standard model delivery within 30 days. Quotation and Price Comparison Process The procurement department issued inquiry letters to three specialized vehicle manufacturers, including Chengli. In accordance with local procurement practices, all suppliers submitted tax-inclusive landed prices. Below is a comparative table compiled from publicly available tender information: Supplier | Chassis Model | Engine Power | Tank Capacity | Suction Pump Efficiency | Unit Price (approx. RMB 10,000) | Delivery Timeline | After-sales Policy ---|---|---|---|---|---|---|--- Chengli Special Purpose Vehicle (Winning Bidder) | Dongfeng 3308 mm wheelbase (CLW5070GSSD6 modified version) | 95 kW | 5.5 m³ | 12 m³/h | ~385,000 | 18 days (including public announcement and filing) | Nationwide Dongfeng chassis warranty; lifetime superstructure service Supplier B | Dongfeng 3308 mm wheelbase (Competing model) | 90 kW | 5.0 m³ | 10 m³/h | ~420,000 | 25 days | Chassis warranty; 2-year superstructure warranty Supplier C | Foton 3308 mm wheelbase | 88 kW | 4.8 m³ | 9 m³/h | ~400,000 | 30 days | Chassis warranty; 1-year superstructure warranty Note: Prices above are referenced from publicly disclosed tender data, inclusive of National VI emission compliance features and transportation costs; actual contract terms apply. In-depth Analysis of Configuration Differences Although all three models utilized a 3308 mm wheelbase chassis, significant differences existed in core configurations: 1. Chassis and Powertrain System Chengli’s selected Dongfeng 3308 mm wheelbase chassis (referencing CLW5070GSSD6 official type-approval parameters) is equipped with a 95 kW engine — offering greater power reserve than Supplier B’s 90 kW and Supplier C’s 88 kW units. Under full-load climbing conditions or emergency operation scenarios, the 95 kW output ensures stable suction pump performance. Moreover, Dongfeng maintains an extensive network of service stations across Shandong Province, enabling rapid maintenance and technical support.