Government procurement case of the Dongfeng single-cab sewage suction truck (blue license plate, 5-cubic-meter capacity) in Linfen City: A full-process analysis from tendering to delivery. In municipal sanitation, procurement of sewage suction trucks often faces multiple challenges: vehicles must suit narrow urban roads and confined working spaces, while also meeting emission standards, ease of registration, and low post-purchase maintenance costs. In 2025, a municipal sanitation department (hereinafter referred to as the 'procuring entity') publicly tendered for five Dongfeng single-cab blue-license-plate sewage suction trucks to address cleaning requirements for urban rainwater pipelines, culverts, and river channels, with a total budget capped at approximately RMB 918,000. This article analyzes the entire process — from how the procuring entity specified key requirements in its tender documents, to how Chengli Special Purpose Vehicle responded with technical and commercial solutions, and ultimately delivered the vehicles — based on an actual tendering and bidding process. I. Core Requirements in the Tender Document: Precise Alignment with Real-World Operational Scenarios According to publicly available tender information, the procuring entity’s key vehicle requirements focused on: 'blue license plate eligibility with Class C driver’s license', 'Dongfeng chassis', '5-cubic-meter tank capacity', and 'China VI emission standard compliance'. Specific requirements included: • Chassis: Dongfeng single-cab configuration, wheelbase ~2,800 mm, equipped with factory-installed air conditioning and power steering — optimized for maneuverability on narrow urban streets; • Tank & Functionality: Effective tank capacity of ~5 m³; self-priming and self-discharging capability; high-pressure cleaning system (pressure ≥16 MPa), capable of suctioning and transporting sludge, wastewater, and solid debris; • Certification & Registration: Must be listed in the MIIT Announcement (e.g., model CLW5070GSSD6), ensuring nationwide registration eligibility, annual inspection compliance, and commercial operation approval; operable with a standard Class C driver’s license; • After-sales Support: Nationwide chassis warranty coverage; lifetime service support for the superstructure; spare parts dispatchable within 24 hours. Notably, the procuring entity explicitly stipulated in the tender document: 'Modified or assembled vehicles are not acceptable'; bidders must be original equipment manufacturers (OEMs), and must provide proof of performance records for similar projects over the past three years. II. Chengli’s Technical Response: From Announcement Parameters to Actual Vehicle Configuration As an enterprise listed in the MIIT Announcement Directory, Chengli Special Purpose Vehicle developed a customized solution based on the Dongfeng chassis (reference model CLW5070GSSD6) to meet the procuring entity’s requirements. Key technical response points are as follows: 2.1 Chassis & Cab Equipped with a Dongfeng single-cab configuration and 2,800-mm wheelbase; overall vehicle length kept under 6 meters, enabling small turning radius — ideal for operations on aging, narrow streets in Linfen City. Engine options include Yunnan Internal Combustion Engine or Quanchai diesel engines (~85 kW output), fully compliant with China VIb emission standards and offering superior fuel economy versus comparable models. 2.2 Tank & Sewage Suction System Tank fabricated from Q235 carbon steel, 4 mm thick, with 5 m³ capacity and internal baffles to enhance driving stability. The suction system includes a 10-meter high-pressure hose, suction lance, and hydraulic locking mechanism; maximum suction lift reaches 6 meters, with maximum suction depth up to 4.5 meters — capable of handling sludge with moisture content ≤85%. The high-pressure cleaning system delivers 18 MPa pressure and ≥30 L/min flow rate, effectively removing adhered sludge deposits. 2.3 MIIT Announcement & Regulatory Comp