I. Case Background: Procurement Requirements of a Municipal Sanitation Department in Xuzhou In 2025, a municipal sanitation department in Xuzhou City, Jiangsu Province, issued a public tender to procure a batch of Dongfeng Yizhan-style sewage treatment vehicles to address insufficient local sewage treatment capacity. According to the tender documents, the procuring entity required vehicles capable of high-efficiency suction, solid-liquid separation, sewage purification, and emergency drainage—while complying with China VI emission standards and ensuring stable operation under complex road conditions. Following multiple rounds of technical evaluation and price negotiation, Chengli Special Purpose Vehicle Co., Ltd. delivered three units of the Dongfeng Yizhan-style sewage treatment vehicle (unit price approx. RMB 450,000, per publicly available tender information). Customer feedback: 'Chengli’s configuration is transparent, and lifelong after-sales service for the superstructure gives us full confidence.' This article comprehensively reconstructs the technical and commercial decision-making process of this procurement across four dimensions: configuration list, value-added optional equipment, pricing logic, and frequently asked questions. II. Comparison of Standard vs. Premium Configuration Lists For this procurement, Chengli offered two mainstream configuration options: Standard Version (suitable for routine sewage cleaning operations) and Premium Version (designed for high-concentration, high-viscosity sewage and emergency response scenarios). Detailed comparison is as follows: Dongfeng Yizhan-Style Sewage Treatment Vehicle Configuration Comparison Table (Based on CLW5180TWFD6 Announcement Parameters) Configuration Item Standard Version Premium Version Chassis Model Dongfeng D9 (China VI) Dongfeng D9 (China VI) Engine Yuchai 180 HP Yuchai 200 HP Sewage Treatment Capacity 20 m³/h 30 m³/h Vacuum Pump Type Water-ring Vacuum Pump Roots-type Vacuum Pump (with oil-gas separator) Solid-Liquid Separation System Basic Screw Extrusion High-efficiency Screw Extrusion + Vibrating Screen Sewage Tank Capacity 8 m³ 10 m³ Auxiliary Equipment Manual Drain Valve, Standard Piping Automatic Drain Valve, High-pressure Rinse Gun, Hydraulic Stabilizing Legs Reference Unit Price (approx.) RMB 400,000 RMB 480,000 Per local procurement practice, the Standard Version is suitable for routine street sewer manhole cleaning, whereas the Premium Version handles industrial wastewater or river emergency response tasks. Ultimately, the procuring party selected a mixed configuration: two Standard Version units plus one Premium Version unit—effectively balancing budget control with emergency readiness. III. Value Analysis of Optional Equipment During procurement, the customer selected the following three optional items—each addressing real-world operational pain points: Automatic Drain Valve (value approx. RMB 15,000): Replaces manual operation, reducing personnel exposure to sewage and improving operational efficiency by over 30%. During Xuzhou’s rainy season, it prevents clogging caused by improper manual operation. High-pressure Rinse Gun (value approx. RMB 8,000): Used to clean tanks, piping, and residual contaminants from ground surfaces—extending equipment service life. Customer feedback: 'One rinse saves labor cleaning costs; ROI achieved within one year.' Hydraulic Stabilizing Legs (value approx. RMB 12,000): Provide vehicle stability during operation, preventing equipment tilt due to uneven ground. Particularly beneficial in narrow alleys of Xuzhou’s older urban districts. The value of these optional features manifested rapidly in actual use: according to the procuring party’s statistics, fault rates decreased by approximately 20%, and average operation time per task was reduced by 15 minutes. IV. Chengli’s Transparent Pricing Logic Explained