Government procurement case of the Zhuhai Dongfeng double-cab sewer cleaning truck (blue license plate, 3 m³): Interpretation of acceptance criteria and winning bid proposal — In 2025, a municipal sanitation department in Zhuhai procured a batch of Dongfeng double-cab sewer cleaning trucks (blue license plate, 3 m³) to address urban drainage system desilting requirements. Due to its eligibility for operation with a Class C1 driver’s license and superior maneuverability in narrow urban alleys, this model is widely favored across southern China’s rainy regions. This article, based on an actual delivery case by Chengli Special Purpose Vehicle Co., Ltd. (hereinafter referred to as 'Chengli'), provides an in-depth analysis of key government procurement aspects—from vehicle receipt inspection and parameter verification to delivery assurance—with special emphasis on rust-resistant coating, sealing component durability, and high-load performance during rainy-season operations under Zhuhai’s humid-heat climate. I. Case Background: Zhuhai Municipal Desilting Requirements and Procurement Plan Zhuhai is located on the western bank of the Pearl River Estuary and features a subtropical monsoon climate, characterized by frequent rainfall and high humidity. During routine inspections, a local municipal sanitation department identified severe sediment accumulation and recurrent blockages in aging urban drainage pipelines—significantly impacting residents’ daily life. Following a public tender process, Chengli’s Dongfeng double-cab sewer cleaning truck (blue license plate, 3 m³) was selected. The procurement budget was capped at approximately RMB 250,000 per unit, with an indicative unit price ranging from RMB 133,000 to 166,000 (based on publicly available tender information). The vehicle utilizes a Dongfeng chassis equipped with a 3 m³ desilting tank and a high-pressure cleaning system, enabling integrated desilting and transport functions. During delivery, Chengli implemented enhanced anti-corrosion treatments—specifically reinforcing rust-resistant coatings and sealing components—to ensure long-term operational stability under Zhuhai’s humid-heat conditions. The vehicles have now entered active service, and customer feedback confirms consistent, reliable performance even under high-frequency rainy-season operations. II. Ten Mandatory Inspection Items Upon Vehicle Receipt: Detailed Acceptance Criteria Vehicle receipt inspection is a core quality- and compliance-assurance step in government procurement. Below are ten mandatory inspection items specific to the Dongfeng double-cab sewer cleaning truck (blue license plate, 3 m³), with particular emphasis on rust resistance and sealing integrity tailored to Zhuhai’s humid-heat environment. 1. Chassis and Engine Nameplate Verification: Confirm chassis model (e.g., Dongfeng EQ1045SJ3CDF), engine model (e.g., Yuchai YC4FA115-50), and manufacturing date—all must match contractual specifications. 2. MIIT Announcement Consistency Check: Cross-verify VIN number, overall dimensions (L×W×H), gross vehicle weight, wheelbase, and other parameters against the official MIIT announcement (e.g., CLW5040TQZD6) to prevent non-compliant modifications. 3. Desilting Tank Seal Integrity Test: Fill the tank with water and inspect weld seams, flange joints, and valve connections for leakage. Under Zhuhai’s high-humidity conditions, rubber gaskets are prone to aging; therefore, verify use of corrosion-resistant materials such as silicone or fluorosilicone rubber. 4. Anti-Rust Coating Inspection: Focus on high-risk corrosion areas—including interior tank surfaces, chassis frame rails, and hydraulic oil tanks. Chengli-delivered units employ epoxy zinc-rich primer plus polyurethane topcoat, with minimum dry-film thickness ≥120 μm—verified using a coating thickness gauge. 5. Hydraulic System Functionality Test: Operate the desilting hydraulic arm, tank tilting mechanism, and high-pressure water pump; assess motion smoothn