Government Procurement Case and Bid-Winning Solution Analysis of the Dongfeng Yizhan-Style Sewage Treatment Vehicle in Yinchuan In Northwest China—especially in cold regions like Yinchuan—municipal sanitation departments face core challenges in procuring special-purpose vehicles that go beyond equipment performance alone; stability under extreme environmental conditions is equally critical. Recently, a municipal sanitation department procured a batch of Dongfeng Yizhan-style sewage treatment vehicles via public tender. Based on this real-world case, this article dissects the tender evaluation criteria, focusing on competitive strategies across three key areas—technical capability, commercial terms, and after-sales service—while addressing the unique requirements of frigid climates. I. Tender Background and Core Requirements This procurement project targets emergency sewage treatment and routine sludge removal tasks at wastewater treatment stations surrounding Yinchuan City. According to publicly available tender information, the budget was capped at approximately RMB 1.664 million, with plans to procure three Dongfeng Yizhan-style sewage treatment vehicles at an estimated unit price of around RMB 500,000. The procuring entity explicitly required vehicles to possess: high-efficiency sewage treatment capability, reliable cold-weather starting performance during winter, and long-term, stable after-sales service support. Chengli Special Purpose Vehicle Co., Ltd. (hereinafter referred to as “Chengli”), a leading domestic enterprise in the special-purpose vehicle sector, leveraged its mature modification expertise on Dongfeng chassis to successfully deliver this batch of vehicles. Customer feedback confirmed outstanding anti-freezing start-up performance at temperatures as low as -15°C, with no reported freezing of hydraulic systems or pipeline blockages. II. Breakdown of Tender Evaluation Criteria Consistent with standard government procurement practices, this tender employed a comprehensive scoring method with a total score of 100 points, divided into three main categories: Technical Score (40 points), Commercial Score (30 points), and Service Score (30 points). Below is a detailed analysis of how full marks were achieved in each category. 1. Technical Score (40 points): How Was Full Marks Achieved? The technical score represents the most critical evaluation component—particularly in Yinchuan—where emphasis is placed on anti-freezing start-up performance and low-temperature hydraulic system stability. Chengli’s Dongfeng Yizhan-style sewage treatment vehicle (reference model: CLW5180GSSD6) demonstrated exceptional performance in the following aspects: • Anti-Freezing Start-Up System: Equipped with an imported electric fuel preheating device, enabling single-attempt engine start-up at -25°C, ensuring uninterrupted winter operations. • Low-Temperature Hydraulic Stability: Hydraulic pipelines utilize low-temperature-resistant sealing components, and hydraulic oil meets specialized low-temperature specifications (pour point below -35°C), preventing pipeline hardening or leakage in sub-zero conditions. • Sewage Treatment Capacity: Features a stacked-screw dewatering machine combined with an automated flocculant dosing system, achieving a treatment capacity of 15 m³/h—surpassing competing models. • Regulatory Compliance: Fully compliant with China VI emission standards, with complete official vehicle type approvals (e.g., CLW5180GSSD6), enabling nationwide registration, annual inspection, and commercial operation. In the technical evaluation phase, Chengli secured the full 40 points by submitting third-party test reports (e.g., low-temperature start-up test reports) and documented field evidence—including operational feedback from four Chengli cleaning & suction sewage trucks deployed by municipal sanitation authorities in Sichuan Province under similarly harsh climatic conditions. 2. Commercial Score (30 points): Competitive Str