Government procurement case of Dongfeng double-cab sludge suction truck (blue license plate, 3 m³) in Ningbo: Practical insights on anti-corrosion, sealing performance, and high-load operation. In coastal cities—especially port and industrial hubs like Ningbo—the challenges for sludge suction trucks extend far beyond simply removing sediment. Metal corrosion caused by humid, hot climates; aging of sealing components due to prolonged rainy-season operations; and overall system stress from frequent deployment all compel procurement agencies to carefully balance cost-effectiveness against long-term durability. This article analyzes a real-world procurement case involving the municipal sanitation department of Ningbo, which selected the Dongfeng double-cab sludge suction truck (blue license plate, 3 m³), examining its decision-making process, core requirements, and the technical highlights of the winning solution—to serve as a reference for similar municipalities. I. Procurement Background: The Municipal Sanitation Department’s Key Pain Points Ningbo lies along the East China Sea, with an annual average rainfall exceeding 1,400 mm and frequent typhoons during summer. The municipal sanitation department oversees over 200 km of urban drainage pipelines, requiring at least three large-scale desilting operations annually—plus routine inspection and maintenance as standard practice. Previously deployed sludge suction trucks suffered from three persistent issues: • Severe Corrosion: Bodywork, tank, and hydraulic piping developed extensive rust spots within just 2–3 years under humid, hot conditions—significantly shortening service life. • Seal Failure: Gaskets at suction and discharge ports aged rapidly in high-temperature, high-humidity environments, causing sewage leakage during rainy-season operations—and consequent road contamination. • Low Uptime: Frequent failures of the hydraulic system and vacuum pump under sustained high-load operation led to high maintenance costs and compromised operational efficiency. Based on these findings, the department decided to procure a batch of Dongfeng double-cab sludge suction trucks (blue license plate, 3 m³), with a budget capped at approximately RMB 285,000 (aligned with local procurement norms). Key technical requirements included comprehensive anti-corrosion treatment across the vehicle, enhanced weather resistance for critical sealing components, and proven reliability under high-frequency operation. Chengli Special Purpose Vehicle Co., Ltd. ultimately won the contract with a customized solution and robust official model specifications (e.g., CLW5070GSSD6 series chassis). II. Middlemen ‘Talking Points’ vs. Direct Procurement Reality: Why Bypass the 4S Dealership? During early procurement stages, the department engaged multiple intermediaries and authorized 4S dealerships. Common sales claims included: “We have a strategic partnership with the OEM—our price is even lower than the factory’s”; “Only we can guarantee delivery within three months for this model”; and “All configurations are standard—no additional anti-corrosion treatment needed.” However, after on-site investigations and comparative pricing, the department discovered: • Price Traps: Intermediaries marked up the Dongfeng chassis + superstructure portion by RMB 9,130–13,700, resulting in total costs over RMB 15,000 higher than direct factory pricing. • Delivery Delays: While intermediaries promised “three-month delivery,” Chengli’s manufacturing base in Suizhou, Hubei Province, typically delivers standard models—including blue-license-plate 3 m³ sludge suction trucks—in just 7–15 days, with zero-inventory express shipment available. • Opaque Configurations: Intermediaries often bundled features under vague “package pricing,” whereas Chengli provided fully transparent configuration lists—and even allowed customers to specify anti-corrosion processes and preferred seal component brands. Ultimately, the department bypassed