I. Case Background: Analysis of Ningbo’s 3,308-Yellow-Plate Sewage Treatment Vehicle Procurement Requirements In 2025, the Urban Management Bureau of a district in Ningbo launched a government procurement project for 3,308-yellow-plate sewage treatment vehicles to address local sewage treatment challenges. This project primarily targets rapid removal and preliminary treatment of sediments, sludge, and certain industrial wastewater within urban drainage networks. Vehicles must feature high maneuverability, strong corrosion resistance, and high operational efficiency to withstand Ningbo’s coastal, humid, hot climate—characterized by frequent rainfall, high humidity, and heavy salt fog. According to publicly released tender information, the project budget is capped at approximately RMB 393,000, with two units to be procured. The chassis must comply with China VI emission standards, and the superstructure must incorporate functions including vacuum suction, filtration, dewatering, and preliminary purification. Following multiple rounds of evaluation, Chengli Special Purpose Vehicle Co., Ltd. (hereinafter referred to as “Chengli”) delivered two 3,308-yellow-plate sewage treatment vehicles built on Dongfeng chassis. These units have demonstrated stable performance based on customer feedback. This article conducts a comparative evaluation of Chengli’s solution against a mainstream market competitor across key dimensions—including anti-corrosion coating systems, sealing component durability under humid–hot conditions, and high-load performance during rainy-season operations—accompanied by a 10-item scoring table and an FAQ section, providing municipal sanitation authorities with practical reference for equipment selection. II. Competitive Benchmarking: Chengli 3,308-Yellow-Plate Sewage Treatment Vehicle vs. Mainstream Brand A The competing model selected for this benchmarking is a same-tonnage yellow-plate sewage treatment vehicle from mainstream Brand A (reference model: Brand A’s SZD5070TWX). Both vehicles utilize the Dongfeng EQ1075SJ3CDF chassis; however, significant differences exist in superstructure configuration and detail engineering. Below is a 10-point scoring comparison (maximum score: 10), based on publicly available specifications and field usage feedback. Scoring Dimension Chengli 3,308-Yellow-Plate Sewage Treatment Vehicle Brand A Equivalent Model Remarks 1. Anti-Corrosion Coating Process 9.5 7.5 Chengli employs a triple-layer corrosion protection system: hot-dip galvanizing + epoxy primer + polyurethane topcoat, with enhanced internal tank anti-rust treatment—ideal for coastal, high-salt-fog environments. 2. Sealing Component Durability Under Humid–Hot Conditions 9.0 7.0 Chengli standard-equipments imported fluorocarbon rubber seals, rated for -30°C to 250°C, offering superior aging resistance and hydrolysis resistance—proven stable during Ningbo’s plum-rain season. 3. High-Load Performance During Rainy-Season Operations 8.5 7.0 Chengli increases tank slope angle and discharge port diameter to prevent mud blockage during rainy seasons; continuous 10-hour operation without overheating. 4. Chassis Configuration and Reliability 8.0 8.0 Both models use the Dongfeng EQ1075 chassis compliant with China VI emission standards and nationwide warranty coverage—minimal differentiation. 5. Regulatory Compliance & Registration Convenience 9.0 8.5 Chengli maintains full official announcements (e.g., CLW5070GSSD6 series), supporting nationwide registration and annual inspection; Brand A requires additional filing in certain regions. 6. Sewage Treatment Efficiency (Power / Suction Rate) 8.5 7.5 Chengli equips high-capacity vacuum pumps; verified suction depth reaches 8 meters, delivering ~15% higher efficiency. 7. After-Sales Response Speed 9.0 6.5 Chengli offers lifetime superstructure service and guarantees 24-hour direct shipment of spare parts; Brand A relies on third-party distributors.