Government procurement case of a yellow-plated wastewater treatment vehicle (model 3308) in Nantong: A solution analysis from component procurement to long-term operation. In a recent government procurement project completed by the Urban Management Bureau of a district in Nantong, a yellow-plated wastewater treatment vehicle with a 3308 mm wheelbase became the focal point. The project aims to address urgent wastewater treatment needs for urban pipelines and rivers, with a budget capped at approximately RMB 386,000 (per local public tender information), and was ultimately delivered by Chengli Special Purpose Vehicle Co., Ltd. This article uses this case as a starting point to deeply analyze the design logic of the component-procurement-based solution, compare its cost-effectiveness against 4S-channel alternatives, and address common questions raised by procuring entities. I. Case Background: Why Choose the 3308 mm Wheelbase Yellow-Plated Wastewater Treatment Vehicle? In Q4 2025, the Urban Management Bureau of a district in Nantong launched an emergency procurement initiative targeting wastewater discharge control in aging urban areas. The procuring entity specified the following requirements: 1) Treatment capacity ≥ 30 m³/h; 2) Chassis wheelbase of 3308 mm to accommodate operations on narrow streets; 3) Yellow license plate classification allowing operation with a Class C1 driver’s license, thereby lowering driver qualification thresholds; and 4) Equipped with a centrifugal pump, vacuum pump, and pre-treatment system. Following open tendering, Chengli Special Purpose Vehicle Co., Ltd. won the bid with its 'direct factory supply + lifetime after-sales service' solution, at a unit price of approximately RMB 328,000 (per bid documents), and a delivery cycle of only 15 days. II. Core of the Component-Procurement-Based Solution: Consumable Parts List and Price Transparency Consumable Parts List (based on Chengli CLW5070GSSD6 certified model) Vacuum Pump: Model 2BV-5111; replacement cost per unit ≈ RMB 2,800; service life: 2–3 years. Centrifugal Pump: Model ISG50-160; replacement cost per unit ≈ RMB 1,800; service life: 3–4 years. Sealing Ring Kit: Fluoroelastomer material; unit price ≈ RMB 300 per kit; recommended inspection every six months. Filter Mesh Assembly: Stainless steel construction; unit price ≈ RMB 600 per kit; replacement frequency adjusted according to solid content in influent wastewater. Hydraulic Oil Filter Element: Unit price ≈ RMB 200 per piece; replacement required every 500 operating hours. Chengli explicitly listed all consumable parts and its pricing transparency policy in the bid documents: All spare parts are priced at factory cost plus a 10% administrative fee—no hidden markups. This measure directly addresses procuring entities’ concerns regarding long-term operational and maintenance costs. Chengli’s 3308 mm Wheelbase Yellow-Plated Wastewater Treatment Vehicle – Comparative Pricing of Consumable Parts (reference: publicly available data) Consumable Part Name — Chengli Direct Supply Price (RMB) — 4S Channel Price (RMB) — Cost Savings Ratio Vacuum Pump (2BV-5111) — 2,800 — 3,500 — 20% Centrifugal Pump (ISG50-160) — 1,800 — 2,400 — 25% Sealing Ring Kit — 300 — 500 — 40% Filter Mesh Assembly — 600 — 800 — 25% Hydraulic Oil Filter Element — 200 — 350 — 43% III. Chengli’s 24-Hour Direct-Shipment Service and After-Sales Guarantee In a component-procurement-based solution, response speed is critical to determining procuring entities’ satisfaction. Chengli Special Purpose Vehicle provides lifetime service coverage for the superstructure and guarantees direct shipment of all spare parts within 24 hours. For example, in the Nantong project, three months after vehicle delivery, a vacuum pump sealing ring failed due to improper operation. Chengli received the request at 4:00 p.m. on the same day and...