I. Tender Background and Core Requirements Analysis In winter 2025, a municipal sanitation department in Beijing launched a specialized vehicle procurement project to address urban sewage treatment and pipeline cleaning needs. According to publicly released tender information, the procuring entity explicitly required vehicles meeting the following criteria: 'China VI emission standard, Dongfeng chassis with 3308 mm wheelbase, and integrated sewage treatment and suction capabilities', with a budget cap of approximately RMB 398,000 per unit. A total of two units were to be procured, primarily for sewage suction, transportation, and preliminary treatment operations under low-temperature winter conditions (–15°C to –25°C). The tender document emphasized three core technical requirements: 1. Freeze-resistant Starting Performance: Vehicles must start reliably at –20°C, and critical components—including the hydraulic system and vacuum pump—must demonstrate proven low-temperature adaptability. 2. Low-Temperature Hydraulic Stability: Hydraulic tubing must be insulated to ensure smooth hydraulic actuation without freezing or jamming under sub-zero conditions. 3. Winter Maintenance Plan: Bidders must provide a comprehensive winter operation and maintenance manual, specifying replacement intervals for antifreeze and lubricants, as well as emergency response procedures. Additionally, the procuring entity required full vehicle type-approval documentation enabling normal registration, annual inspection, and commercial operation licensing in Beijing. Consistent with local procurement practice, this tender employed a comprehensive evaluation method, with technical scoring accounting for 60% and commercial scoring for 40%. II. Chengli’s Technical Response: Customization Based on CLW5070GSSD6 Chassis Chengli Special Purpose Vehicle tailored its technical solution specifically for this tender, building upon the officially approved model CLW5070GSSD6 (sourced from the MIIT Type Approval Database) and integrating it with the Dongfeng 3308 mm wheelbase chassis. Although originally certified as a water-sprinkling vehicle, Chengli reconfigured the upper structure to function as a sewage treatment vehicle—retaining suction, sewage separation, and temporary storage capabilities. Key technical responses included: 1. Freeze-Resistant Starting System: Equipped with an engine pre-heating device, –35# diesel fuel, and a low-temperature battery to ensure ≥95% single-start success rate at –20°C. 2. Low-Temperature Hydraulic Stability: Hydraulic lines wrapped with dual-layer thermal insulation sleeves; hydraulic oil upgraded to low-temperature grade (rated for –40°C); and an automatic hydraulic oil heater installed to circulate and warm oil to operational temperature upon startup. 3. Winter Maintenance Plan: Included a dedicated 'Winter Operation Manual' specifying antifreeze replacement (rated for –35°C), hydraulic oil inspection every 200 operating hours, and use of freeze-resistant lubricant for the vacuum pump. As part of Chengli’s lifetime upper-structure service commitment, free winter-specific inspections are offered annually before November upon scheduled appointment. Vehicle configuration parameters (based on CLW5070GSSD6 official approval): - Chassis Model: Dongfeng, 3308 mm wheelbase, China VI diesel engine, rated power approx. 85 kW - Tank Capacity: ~3.2 m³ (sewage suction tank), equipped with sewage separation and filtration system - Vacuum Pump: Water-ring type, maximum suction depth 8 meters, suction time ≤5 minutes - Emission Standard: China VI, fully compliant with Beijing environmental regulations III. Commercial Quotation Strategy and Scoring Approach Chengli adopted a 'transparent configuration + factory-direct sales' pricing strategy, avoiding bundled or opaque package pricing traps.