Case Study and Bid Solution Analysis of the Baoji Municipal Government's Procurement of CN6 Dongfeng 3308 Wheelbase Sewage Treatment Vehicles via Government Procurement. I. Project Background and Procurement Requirements: In early 2023, a municipal sanitation department in Baoji, Shaanxi Province, planned to procure a batch of sewage treatment vehicles for emergency sewage treatment and dredging operations in urban pipelines, rivers, and industrial parks. Following an open tender process, two CN6 Dongfeng 3308 wheelbase sewage treatment vehicles were ultimately procured, with a budget cap of approximately RMB 392,000 (tax-inclusive landed price, per publicly disclosed tender information). These vehicles were delivered by Chengli Special Purpose Vehicle Co., Ltd. They have been operating locally in Baoji for over 12 months, accumulating approximately 20,000 km of operational mileage. Key procurement requirements included: Chassis Requirements: Dongfeng 3308 wheelbase, CN6 emission standard, compliant with local environmental regulations. Superstructure Configuration: Capable of sewage suction, solid-liquid separation, and sludge dewatering, with a minimum treatment capacity of 10 m³/h. After-sales Service: Nationwide chassis warranty; lifetime service coverage for superstructure components; spare parts guaranteed to ship within 24 hours. Following multiple rounds of technical evaluation and commercial negotiation, Chengli Special Purpose Vehicle Co., Ltd. secured the bid and completed delivery, leveraging its comprehensive product certifications (e.g., model CLW5070GSSD6), factory-direct sales (eliminating intermediaries), and a robust after-sales support system. Quick Case Summary: – Procuring Entity: A municipal sanitation department in Baoji – Vehicle Model: CN6 Dongfeng 3308 wheelbase sewage treatment vehicle (referencing certified parameters of CLW5070GSSD6) – Quantity Procured: 2 units – Delivery Date: April 2023 – Current Operational Status: In service for over 12 months, cumulative operational mileage approx. 20,000 km. II. Maintenance Records and Failure Rate Analysis Over a 3-Year Service Cycle: Based on maintenance logs from Baoji’s local operations team and data from Chengli’s after-sales service system, we compiled maintenance records for these two sewage treatment vehicles over their first 12 months of operation. As the full 3-year period has not yet elapsed, the following data reflects actual observations over the initial 12 months, supplemented by reasonable projections derived from long-term operational data of comparable Chengli models deployed in Sichuan and Henan provinces (e.g., 10 units of 5-cubic-meter water sprinklers at a Henan sanitation bureau; 4 units of cleaning & suction-sewer trucks at a Sichuan municipal authority). 1. Actual Maintenance Records (12 Months): Failure Type | Occurrence Count | Affected Component(s) | Resolution Method — Hydraulic System Oil Leakage | 2 times | Hydraulic pipe joint(s) | Tightening or replacement of sealing ring(s) — Vacuum Pump Abnormal Noise | 1 time | Vacuum pump bearing | Bearing replacement and lubrication — Electrical System Fault | 1 time | Control module connector(s) | Reinsertion and secure fastening — Sewage Separation Filter Clogging | 3 times | Separation unit filter screen(s) | Cleaning or replacement of filter screen(s) — Chassis Routine Maintenance | 2 times | Engine, transmission | Covered under Dongfeng chassis nationwide warranty. Note: All above data originates from customer feedback and Chengli’s after-sales service records. The failure rate is low, with no major failures affecting operational performance reported. 2. Failure Type Distribution Analysis: Maintenance records indicate that failures primarily fall into three categories: Hydraulic System (approx. 28%): Hydraulic pipe leakage is common, typically caused by joint loosening due to prolonged vibration. Chengli employs national-standard hydraulic components; replacing the sealing ring resol