Government procurement case of the EHY5045TWCE6 sewage treatment vehicle in Ningbo: A reliable choice for humid and hot environments. I. Background of Urgent Demand: Emergency Deployment Ahead of the Rainy Season — In May 2025, a municipal sanitation department in a district of Ningbo City discovered during routine inspections that drainage networks across multiple old residential communities and commercial areas within its jurisdiction were severely blocked. Particularly during the rainy season, sewage backflow and road surface overflow occurred frequently, seriously affecting residents’ daily lives and urban appearance. After evaluation, existing manual cleaning and temporary pump-suction methods proved inefficient and posed safety hazards. The department immediately initiated an emergency procurement procedure, planning to urgently acquire a batch of high-performance sewage treatment vehicles, with the EHY5045TWCE6 model selected as the preferred option to cope with the upcoming plum rain season. According to publicly released tender information, the procurement budget was capped at approximately RMB 938,000 (unit price around RMB 280,000), requiring bidders’ vehicles to meet the following core performance criteria: Corrosion-resistant coating: Given Ningbo’s coastal environment—characterized by high humidity and high salt fog—the vehicle body and critical components must employ specialized anti-corrosion processes to ensure no visible rusting for at least five years. Seal durability: As sewage treatment vehicles frequently contact corrosive wastewater and chemicals, all sealing components (e.g., pump housings, valve bodies, pipe joints) must maintain functionality for no less than three years under humid and hot conditions. Rainy-season operational capability: Vehicles must sustain operation for no fewer than eight hours per day under continuous heavy rainfall, and remain fully functional on muddy or flooded roads and other complex terrain. II. Expedited Tender Process: Tight Timeline, High Standards — Due to the urgent nature of the requirement, the procurement window was only 15 days. The municipal sanitation department swiftly formed a dedicated task force and, referencing the PRC Government Procurement Law and local emergency procurement regulations, adopted a competitive negotiation approach. Four suppliers responded; Chengli Special Purpose Vehicle Co., Ltd. (“Chengli”), a leading domestic special-purpose vehicle manufacturer, emerged as a key evaluation candidate—leveraging its mature technical expertise from models such as the CLW5070GSSD6 and its extensive service experience with over 500 municipal sanitation units. During the tender evaluation, judges focused on the following dimensions: Technical proposal: Chassis compatibility (recommended brands include Dongfeng and Sinotruk), sewage treatment system efficiency, and automation level. After-sales service: Nationwide chassis warranty, lifetime upfitting support, and 24-hour direct parts dispatch capability. Delivery lead time: Standard delivery for conventional models is 7–15 days—can this meet emergency requirements? Price transparency: Chengli adhered to transparent configuration specifications and avoided bundled pricing, eliminating hidden costs. Ultimately, Chengli secured the contract for two EHY5045TWCE6 sewage treatment vehicles, leveraging its advantage of ‘direct factory sales without intermediaries’ (offering savings of approximately RMB 8,000–15,000 versus 4S-channel pricing for identical configurations), along with proven experience adapting models like the CLW5180GSSD6 for humid and hot environments. III. Chengli’s Rapid Response and Delivery: 18 Days from Contract Signing to Road Readiness — Upon signing the procurement contract, Chengli’s production team activated its ‘green channel’. Considering Ningbo’s humid and hot climate, Chengli implemented targeted vehicle optimizations: Coating upgrade: Application of epoxy zinc-rich primer plus polyuret