Case Study and Bid-Winning Solution Analysis of the Weifang Dongfeng Single-Cab Sewage Suction Truck (Blue License Plate, 5 m³ Capacity) for Government Procurement In urban drainage network maintenance, riverbed dredging, and emergency flood control during heavy rainstorms, blue-plate 5 m³ sewage suction trucks—valued for their maneuverability, strong passability, and operability with a Class C driver’s license—have become a key procurement model for municipal sanitation departments. This article takes a recent procurement by a sanitation department in Weifang as an example, comprehensively reconstructing the tender process, technical compliance, and commercial strategy to provide reference for industry peers. I. Core Tender Requirements This procurement was initiated by a municipal sanitation authority in Weifang, with a budget capped at approximately RMB 345,000 (per publicly disclosed tender information), procuring one unit of blue-plate 5 m³ sewage suction truck primarily for dredging operations in old urban residential areas, narrow alleys, and underground pipelines. Core tender requirements are as follows: Chassis Requirements: Single-cab chassis from Dongfeng or another leading domestic brand; wheelbase ≤ 3,308 mm to ensure flexible steering on narrow roads and within residential communities; engine compliant with China VI emission standards and delivering ≥ 95 kW output power. Superstructure Requirements: Tank effective capacity ≈ 5 m³, fabricated from high-strength corrosion-resistant steel; equipped with a high-pressure cleaning pump (rated pressure ≥ 16 MPa) and a vacuum suction pump (suction lift ≥ 8 m), enabling integrated 'flushing + suction' operation; rear tank cover hydraulically actuated with reliable sealing to prevent leakage during transport. Certification & Registration: Vehicle must be listed in MIIT’s “Announcement of Road Motor Vehicle Manufacturers and Products”, fully compliant with blue-plate and Class C driver’s license requirements, and eligible for standard registration, annual inspection, and road transport permit issuance. After-Sales Service: Minimum one-year整车 warranty; chassis covered under nationwide authorized service network; superstructure supported by lifelong technical assistance; spare parts delivery response time ≤ 24 hours. II. Chengli Technical Compliance Proposal In response to the tender requirements, Chengli Special Purpose Vehicle Co., Ltd. (“Chengli”) proposed the CLW5070GSSD6 model sewage suction truck, built upon a Dongfeng single-cab chassis (referencing MIIT Announcement parameters). Key technical highlights include: Chassis Matching: Dongfeng single-cab chassis with 3,308 mm wheelbase; powered by Quanchai or Yunnan Yunei engine delivering ~100 kW output, fully compliant with China VI standards; hydraulic power steering system ensures light, responsive handling ideal for frequent start-stop operations in urban environments. Superstructure Configuration: Tank fabricated from Q345B high-strength steel (thickness ≥ 4 mm), interior coated with anti-corrosion layer; equipped with imported Italian high-pressure pump (rated pressure 17 MPa) and water-ring vacuum suction pump (suction lift 9 m); tank fitted with overflow alarm system; rear cover features hydraulic locking mechanism ensuring pressure-tight, leak-proof sealing during transport. Certification & Regulatory Compliance: The CLW5070GSSD6 model is officially listed in the MIIT Announcement, with gross vehicle weight ≤ 4,495 kg and rated payload ≈ 1,800 kg—fully meeting blue-plate classification criteria—and eligible for standard registration, annual inspection, and road transport permit issuance nationwide. Additional Features: Tank pre-equipped with optional self-dumping interface for efficient sludge discharge; optional auxiliary equipment—including sight tube and liquid level indicator—available to meet diverse operational requirements. Prior to bidding, Chengli’s technical team conducted two rounds of te