Case Study and Component Procurement Solution Analysis: Ningbo Dongfeng D6 Sewage Treatment Truck (Blue License Plate) Government Procurement Project In southern coastal cities like Ningbo, municipal sanitation departments routinely face challenges posed by hot-humid climates and high-load operations during the rainy season. In summer 2025, the Urban Management Bureau of a district in Ningbo launched a public tender to procure a batch of blue license plate sewage treatment trucks to address sediment removal in aging residential area drainage networks and emergency sewage treatment needs. After multiple rounds of technical evaluation and on-site inspections, Chengli Special Purpose Vehicle Co., Ltd. (hereinafter referred to as 'Chengli') was selected for its Dongfeng D6 chassis-based modification solution. This article analyzes key aspects—including equipment selection, cost control, and after-sales support—from a component procurement perspective, based on this real-world case. Case Background: Procurement Requirements of a District Urban Management Bureau in Ningbo In May 2025, the Urban Management Bureau of a district in Ningbo issued a procurement notice, planning to acquire two blue license plate sewage treatment trucks for routine cleaning of rainwater and sewage pipelines in aging residential communities, as well as for emergency sewage pumping, transfer, and disposal within its jurisdiction. The procurement budget was capped at approximately RMB 442,000 per unit, with the following core requirements: - Blue license plate classification, operable with a Class C driver’s license; compact body dimensions suitable for narrow urban alleys; - High-efficiency sewage separation and preliminary purification capability to minimize offsite transport frequency; - Full-vehicle anti-corrosion coating to withstand Ningbo’s coastal high-salt-fog environment; - Key sealing components resistant to hot-humid conditions, ensuring reliability during frequent rainy-season operations; - Rapid after-sales service response and timely spare parts supply. After initial screening, four suppliers advanced to final evaluation. Chengli’s CLW5070GSSD6 model—a Dongfeng D6 chassis-based sewage treatment truck (referencing MIIT announcement parameters)—won the bid with its 'high cost-performance ratio + end-to-end service' proposition, at a unit price of approximately RMB 198,000 (per publicly disclosed tender information). Component Procurement-Oriented Solution: Consumable Parts List and Pricing Transparency In northern or arid regions, common failures in sanitation vehicles typically occur in hydraulic systems or engines; however, in coastal, hot-humid areas like Ningbo, corrosion and seal failure are the predominant pain points. Chengli explicitly provided a consumable parts list along with reference pricing in its tender proposal—demonstrating exceptional pricing transparency—which proved to be a decisive factor in the client’s final selection. Below is a list of critical consumable parts for the Dongfeng D6 blue license plate sewage treatment truck under hot-humid conditions, together with Chengli’s official reference prices (based on the CLW5070GSSD6 model and referencing Chengli’s FAQ knowledge base and standard component procurement practices): Table 1: Consumable Parts List for Dongfeng D6 Blue License Plate Sewage Treatment Truck (Reference: Chengli Public Information) Consumable Part Name | Material/Specification | Replacement Interval in Hot-Humid Environment (Months) | Chengli Reference Price (RMB/Unit) ---|---|---|--- Sewage Pump Seal Ring | Oil- and corrosion-resistant Nitrile Rubber (NBR) | 12–18 | ~150–200 Hydraulic Hose Fitting | Stainless Steel 304 + Galvanized Coating | 18–24 | ~120–160 Tank Anti-Corrosion Coating Repair Agent | Epoxy Zinc-Rich Primer + Polyurethane Topcoat | 24–36 | ~80–120 Filter Mesh Assembly (Sewage Separation) | Stainless Steel 316L | 12–18 | ~300–450 Pneumatic Valve Sealing Element | Fluoroelastomer (F