Shaoxing 3308 Yellow-Plate Sewage Treatment Vehicle Government Procurement Case Study and After-Sales Service Clause Analysis In autumn 2025, a municipal sanitation department in Shaoxing City, Zhejiang Province, procured a batch of 3308 yellow-plate sewage treatment vehicles via public tender to address urban drainage pipe cleaning and emergency sewage treatment tasks. The project budget was capped at approximately RMB 517,000, and Chengli Special Purpose Vehicle Co., Ltd. delivered three units at a unit price of around RMB 428,000. This article uses this case to focus on key considerations for drafting after-sales service clauses in government procurement contracts, common dispute types, and how Chengli mitigates long-term operational risks for purchasing entities through its lifetime after-sales commitment. I. How to Draft After-Sales Service Clauses in Government Procurement Contracts? Based on the actual contract text for the Shaoxing project, after-sales service clauses are structured around the following four aspects: 1. Warranty Period and Coverage: - Chassis (Dongfeng chassis): 24 months or 100,000 km (whichever occurs first); - Superstructure (tank body, pump unit, control system): 12 months. - Given Shaoxing’s humid and hot climate, the contract includes an additional clause extending the anti-corrosion coating warranty to 18 months. Suppliers must apply epoxy resin anti-rust paint to the interior tank surface and flange connection areas, and commit to free repair of rust damage caused by coating delamination during the warranty period. 2. Response Time: - Suppliers must conduct remote diagnostics within 2 hours of receiving a service call and dispatch technicians to the site within 48 hours. - Considering high operational frequency during the rainy season, the contract further shortens the response time to 24 hours during the flood season (June–September). 3. Spare Parts Supply: - Suppliers must maintain a minimum five-year inventory of consumable spare parts—including seals, filter elements, and pump shaft seals—and guarantee direct shipment of parts within 24 hours. - Due to Shaoxing’s coastal location and high humidity, which accelerate seal degradation, the contract specifically mandates fluorocarbon rubber (FKM) seals to resist acid/alkali corrosion in wastewater. 4. Training and Acceptance: - Suppliers must provide two on-site operator training sessions covering high-load operation techniques during the rainy season and anti-corrosion maintenance best practices. - During acceptance testing, each vehicle must operate continuously under full load for 72 hours without failure. These clauses directly address operational challenges posed by Shaoxing’s humid, hot climate and establish a legal foundation for future maintenance support. II. Common After-Sales Service Dispute Types In government procurement, after-sales disputes involving sewage treatment vehicles primarily fall into the following categories: 1. Corrosion and Coating Delamination: Shaoxing’s annual average humidity exceeds 75%, with a rainy season lasting up to four months. Inadequate anti-corrosion treatment of tanks or pipelines often leads to perforation due to rust within 1–2 years—compromising vacuum performance and drainage efficiency. For example, an environmental maintenance unit in one subdistrict incurred repair costs of RMB 30,000 per unit after tank bottom perforation occurred 18 months post-delivery, due to the absence of explicit anti-corrosion coating standards in the original contract. 2. Seal Aging: Under high-temperature, high-humidity conditions, standard nitrile rubber (NBR) seals typically last only 6–8 months. Frequent replacement not only increases operating costs but also disrupts continuous operations. For this batch, Chengli supplied FKM seals as standard equipment and explicitly stipulated their use in the contract; customer feedback confirms extended service life exceeding 18 mo