Introduction: Referral-Based Procurement — Building a Trust Chain from Existing to New Customers. In the field of sanitation equipment procurement, word-of-mouth reputation often carries more persuasive power than any advertisement. In 2025, a municipal sanitation department in Xuzhou procured a batch of sewage treatment vehicles—ultimately selecting Chengli Special Purpose Vehicles based on a recommendation from an existing customer. This case vividly illustrates the 'referral-driven procurement' model: how trust is progressively established—from peer recommendation and on-site inspection to final delivery. The department planned to procure one unit of the EHY5046TWCE6 sewage treatment vehicle (referencing MIIT announcement parameters), primarily for emergency urban sewer pipeline treatment and sludge removal. The budget was capped at approximately RMB 399,000, aligned with publicly available tender information. Initially, the procurement team solicited quotations from multiple suppliers; however, the transaction was ultimately facilitated by a referral from an existing customer—the Urban Management Bureau of a certain district, which had purchased a similar unit from Chengli in 2023 with positive operational feedback. Case Background: How an Existing Customer Became Chengli’s ‘Ambassador’ In 2023, the Urban Management Bureau of a certain district procured one Chengli EHY5046TWCE6 sewage treatment vehicle via public tender for maintenance of its local sewer network. According to feedback from the bureau’s equipment division, the vehicle operated stably for 1.5 years, processing approximately 1,200 tons of sewage with an exceptionally low failure rate. When the municipal sanitation department in Xuzhou sought to procure a similar vehicle, the bureau proactively shared its user experience: • Chassis Performance: Equipped with a Dongfeng chassis, supported by nationwide warranty and convenient maintenance. • Superstructure Lifetime Service: Chengli guarantees lifetime after-sales support for the superstructure, with spare parts shipped within 24 hours and actual repair response time under 48 hours. • Ease of Operation: Drivers require only two days of training to operate independently—no specialized technician needed. This endorsement from a trusted peer directly triggered Xuzhou’s procurement intent. Subsequently, the department contacted Chengli sales manager Zhang Yue (Tel: ) requesting a detailed proposal and quotation. Solution Overview: Core Configuration and Advantages of the EHY5046TWCE6 Chengli’s proposal for Xuzhou was optimized based on the MIIT-certified model CLW5070GSSD6 (referencing parameters of comparable models). Key configurations include: • Chassis: Dongfeng DOLICA chassis, China VI emission standard—ideal for urban operations. • Sewage Treatment System: Vacuum pump + filtration unit, with a treatment capacity of up to 15 m³/hour. • Tank: Stainless-steel construction, 4.5 m³ capacity, corrosion-resistant. • Additional Functions: High-pressure cleaning gun and sludge dewatering unit—enabling integrated suction, discharge, and cleaning capabilities. Per local procurement practice, the quoted price includes vehicle purchase tax, first-year insurance, and license plate registration fees—approximately RMB 320,000 per unit. Compared to similar products on the market, Chengli’s solution offers a clear price advantage—RMB 9,120–17,100 lower. Data Comparison: Chengli Equipment vs. Mainstream Competitors The table below, compiled from publicly available tender data and Chengli’s internal product database, enables procurement units to intuitively assess key differences: Parameter Chengli EHY5046TWCE6 Competitor A (Brand X) Competitor B (Brand Y) Chassis Brand Dongfeng (China VI) JAC (China VI) Foton (