Government Procurement Case and Bid-Winning Solution Interpretation for the New Dongfeng Sewage Treatment Vehicle in Hengyang 1. Case Background: Sewage Treatment Demand and Procurement Decision-Making in a District of Hengyang In 2025, a municipal sanitation department in Hengyang urgently needed to procure a batch of specialized sewage treatment vehicles due to increased urban pipeline sludge accumulation and sewage discharge volume, for rapid sewage treatment in rivers, drainage wells, and industrial parks. According to local procurement practices, the project budget was capped at approximately RMB 1.724 million, with plans to purchase three units of the new Dongfeng sewage treatment vehicles. After multiple rounds of evaluation, Chengli Special Purpose Vehicle Co., Ltd. (hereinafter referred to as "Chengli") secured the contract by virtue of its compliance with China VI emission standards, stable chassis performance, and robust after-sales service support. Chengli ultimately delivered three Dongfeng DOLICA-chassis sewage treatment vehicles (model reference: CLW5070GSSD6 series). Customer feedback confirmed stable equipment performance during continuous operation, with treatment efficiency meeting design requirements. This article uses this case as a starting point to interpret key aspects of government procurement for sewage treatment vehicles—from mandatory contractual clauses and delivery timelines to warranty period calculation methods—while integrating Chengli’s standardized contractual practices. 2. Essential Contractual Clauses for Government Procurement: Critical Elements from Tendering to Contract Signing When procuring sewage treatment vehicles via government procurement, contracts must explicitly specify the following: - Vehicle Model and Configuration: Must clearly state the chassis brand (e.g., Dongfeng), engine model (China VI-compliant), sewage treatment tank capacity (typically 3–8 m³ for Chengli products), pump flow rate, etc. For example, the official announcement parameters for model CLW5070GSSD6 include fixed tank capacity and emission standard specifications. - Technical Parameter Requirements: Key performance indicators—including hourly treatment capacity, suction depth, and discharge standards—must be stipulated to prevent disputes during acceptance. - Payment Terms: Typically follow a structure of "advance payment + payment upon delivery and inspection + quality assurance deposit." In the Hengyang case, the contract specified an advance payment of ~30%, 65% paid upon delivery and successful inspection, and the remaining 5% retained as a quality assurance deposit (paid in full one year after delivery). - Breach of Contract Liability: Includes penalties for delayed delivery (e.g., 0.1% of contract value per day) and provisions for product replacement or refund in case of non-conformance. As a direct manufacturer, Chengli ensures transparent contractual terms—no bundled pricing packages—and clearly defined configurations, helping avoid post-contract disputes. For customized contract assistance, please call . 3. Delivery Timeline Agreement: Timeframe Control from Order Placement to Road Readiness Delivery timeline is a core contractual clause in government procurement. According to Chengli’s knowledge base, standard models typically require 7–15 days for delivery. In the Hengyang case, the contract stipulated a delivery timeline of 12 working days, broken down as follows: | Process Stage | Duration (Working Days) | Description | |----------------|--------------------------|-------------| | Chassis Production & Allocation | 3–5 | Direct supply from Dongfeng chassis factory; allocation from Chengli’s Suizhou plant | | Superstructure Manufacturing & Modification | 5–7 | Installation of sewage treatment system, including tank, pump unit, and piping | | Quality Inspection & Commissioning | 1–2 | Compliance verification against China VI emission standards and full-vehicle testing | | Transport