Zhongshan’s Government Procurement Case for the 3308-mm Wheelbase Sewage Treatment Vehicle EHY5045TWCE6: An In-Depth Analysis from Competitive Bidding to Chengli’s Victory In municipal sanitation, procurement of sewage treatment vehicles directly impacts operational efficiency of urban drainage systems and environmental compliance. In 2025, an environmental maintenance unit of a subdistrict in Zhongshan City launched a public tender for a 3308-mm wheelbase sewage treatment vehicle (model EHY5045TWCE6), primarily intended for routine cleaning of sewage wells and septic tanks, as well as emergency transfer operations. This article reconstructs the core bidding process based on publicly available tender information, compares key competing products, and explains why Chengli Special Purpose Vehicle Co., Ltd. ultimately won customer approval. I. Project Background and Core Requirements The customer explicitly specified the following requirements for the sewage treatment vehicle: ① Chassis wheelbase of 3308 mm to ensure maneuverability on narrow urban streets; ② Tank capacity of no less than 3.5 m³ (per publicly disclosed tender documents); ③ Equipped with high-pressure cleaning pump and vacuum suction pump, enabling integrated functions of cleaning, suction, and transfer; ④ Emission standard compliant with China VI, enabling nationwide registration; ⑤ Budget capped at approximately RMB 344,000. Participating bidders included Chengli Special Purpose Vehicle Co., Ltd., Zoomlion Environmental, and Fujian Longma Environmental Sanitation. II. Key Bidding Participants Per local procurement practice, five enterprises submitted tender documents. Among them, Chengli Special Purpose Vehicle Co., Ltd. (model EHY5045TWCE6) emerged as the leading contender, owing to its complete official announcements, transparent configuration, and localized service support. Other major competitors included: • Zoomlion Environmental: Model ZLJ5045TWC, built on Dongfeng Dolika chassis; emphasizes brand premium and nationwide service network. • Fujian Longma Environmental Sanitation: Model FLM5045TWCE6, also based on 3308-mm wheelbase chassis; focuses on high-efficiency suction performance. • A Hubei-based small-scale upfitting manufacturer: Unannounced model, lower quoted price, but lacking full MIIT certification. III. Comparative Analysis Table of Competitors | Evaluation Dimension | Chengli Special Purpose Vehicle (EHY5045TWCE6) | Zoomlion Environmental (ZLJ5045TWC) | Fujian Longma Environmental Sanitation (FLM5045TWCE6) | |----------------------|--------------------------------------------------|-------------------------------------|--------------------------------------------------------| | Chassis Brand | Dongfeng Dolika (3308-mm wheelbase) | Dongfeng Dolika (3308-mm wheelbase) | Foton Ouman (3308-mm wheelbase) | | Tank Capacity | Approx. 4.0 m³ (per MIIT announcement CLW5070GSSD6) | Approx. 3.8 m³ | Approx. 3.6 m³ | | Core Functions | Cleaning + Suction + Transfer; equipped with high-pressure cleaning pump and vacuum pump | Cleaning + Suction; slightly lower high-pressure pump power | Suction-focused; weaker cleaning capability | | Emission Standard | China VI | China VI | China VI | | Regulatory Compliance | Full MIIT certification (e.g., CLW5070GSSD6); nationwide registration eligible | Certified | Certified | | Price (per public tender data) | Approx. RMB 275,000 | Approx. RMB 320,000 | Approx. RMB 290,000 | | After-sales Service | Nationwide Dongfeng chassis warranty; lifetime upfit service by Chengli; spare parts dispatched within 24 hours | —