I. Project Background: Framework Agreement Procurement Requirement of a Municipal Sanitation Department In early 2025, a municipal sanitation department in the Nanchong area launched a new round of special-purpose vehicle procurement to address aging sewage treatment infrastructure and insufficient emergency response capacity within its jurisdiction. This procurement adopted a framework agreement model—aiming to identify qualified suppliers and vehicle models through a single tender, followed by batch orders placed as needed. The core requirement was a yellow-plate sewage treatment vehicle (reference chassis: 3308 mm wheelbase), with a budget capped at approximately RMB 343,000 (per publicly available tender information), and an initial delivery of two units, with potential follow-up orders based on operational performance. The department explicitly stipulated in its tender documents that vehicles must comply with China VI emission standards, possess sewage suction, solid-liquid separation, temporary storage, and preliminary purification capabilities; the chassis must be from a reputable brand (e.g., Dongfeng or Sinotruk) to ensure service accessibility and maintenance convenience. In addition, suppliers were required to provide nationwide warranty coverage and demonstrate proven experience with similar projects. II. Shortlisting Process and Chengli Special-Purpose Automobile’s Response During the framework agreement shortlisting phase, multiple special-purpose vehicle manufacturers competed for inclusion. Chengli Special-Purpose Automobile Co., Ltd.—one of China’s largest special-purpose vehicle manufacturers (with a product database covering 946 models across 44 categories)—successfully secured inclusion based on the following advantages: Comprehensive Official Announcements: Chengli holds complete MIIT (Ministry of Industry and Information Technology) announcement parameters for 108 models—including CLW5070GSSD6—and its yellow-plate sewage treatment vehicles (e.g., CLW5120TCAD6) fully meet Nanchong’s local registration and annual inspection requirements without requiring post-factory modifications. Chassis Resources: Based on the Dongfeng 3308 mm wheelbase chassis (China VI compliant), factory-backed nationwide warranty ensures compliance with the purchaser’s requirements for brand reputation and reliability. Direct Factory Sales: Same-specification vehicles cost RMB 8,000–15,000 less than those sourced via 4S dealerships; production in Suizhou enables standard-model delivery within 7–15 days, meeting urgent procurement timelines. In its technical proposal, Chengli’s sewage treatment vehicle features a dual-pump system (“vacuum pump + centrifugal pump”) enabling suction depths up to 8 meters, an ~8 m³ tank volume (compliant with yellow-plate vehicle regulations), and an automatic unloading device capable of handling wastewater with solid content ≤30%. This solution closely aligns with the purchaser’s objectives of “temporary storage + preliminary purification.” III. Order Trigger Mechanism and Delivery Details Following execution of the framework agreement, the purchaser triggered the first order based on actual needs: two yellow-plate sewage treatment vehicles, priced at approximately RMB 280,000–320,000 per unit (per publicly available tender data), totaling ~RMB 600,000. Upon receiving the order, Chengli leveraged its zero-inventory shipping model at its Suizhou, Hubei production base to complete chassis modification, superstructure commissioning, and MIIT announcement review within 15 days. During delivery, Chengli dispatched a technical team to conduct on-site handover training covering vehicle operation, routine maintenance, and troubleshooting of common faults. Customer feedback indicated: “Over three months of operation, the vehicles processed approximately 50 tons of sewage daily with stable suction efficiency and no reported chassis or superstructure failures.” Currently, these units are deployed with an