Government Procurement Case and Bid-Winning Solution Analysis for the Dongfeng Double-Cab Sewer Cleaning Truck (Blue License Plate, 3 m³) in Ma'anshan City In a sewer cleaning equipment upgrade procurement conducted by a municipal sanitation department in Ma'anshan City, the blue-plate 3 m³ Dongfeng double-cab sewer cleaning truck became the core requirement. The tender documents explicitly stipulated that the vehicle must feature outstanding cold-start capability, stable hydraulic performance under low temperatures, and include a complete winter maintenance plan. Chengli Special Purpose Vehicle Co., Ltd. (hereinafter referred to as 'Chengli') developed a targeted solution after thoroughly assessing the local climate and operational environment, and ultimately delivered the batch of vehicles. The following provides an in-depth interpretation of the selection rationale and key solution elements based on this procurement case. Case Background: Unique Winter Sewer Cleaning Challenges in Ma'anshan Ma'anshan is located in the lower reaches of the Yangtze River, where winter temperatures frequently drop to -5°C to -10°C, accompanied by high humidity. Such low temperatures pose severe challenges to vehicle starting and hydraulic system operation. The department’s existing equipment frequently experienced issues during winter—including difficulty starting cold engines, hydraulic oil solidification, and frozen/fissured hydraulic lines—directly undermining emergency pipeline clearance efficiency. Consequently, the primary procurement objectives were: reliable vehicle startup at -15°C, stable hydraulic system operation under low temperatures, and implementation of a practical winter maintenance procedure. According to local procurement conventions, the budget was constrained to approximately RMB 135,000–169,000 (per publicly available tender information), with requirements specifying a blue-plate vehicle operable with a Class C driver’s license, 3 m³ tank capacity, and a double-cab configuration to accommodate the full operations crew. Among multiple suppliers, Chengli secured approval due to its precise adaptation to Ma'anshan’s climatic conditions and its fully certified, compliant vehicle models. Chengli’s Core Solution: Cold-Start Capability, Low-Temperature Hydraulic Stability, and Winter Maintenance The Dongfeng double-cab sewer cleaning truck delivered by Chengli to Ma'anshan corresponds to model CLW5040TQZD6 (built on a Dongfeng chassis), featuring a blue license plate, 3 m³ capacity, and compliance with China VI emission standards. To address region-specific winter challenges, the solution focuses on three critical aspects: 1. Cold-Start Performance: Standard Cold-Start Assistance System To overcome diesel engine starting difficulties in low temperatures, Chengli equipped this model with a standard engine preheating system—including intake air preheating and fuel heater—ensuring reliable startup within 10 seconds even at -20°C. Additionally, the vehicle uses a China VI-compliant, low-temperature battery with enhanced capacity (>60 Ah) to prevent power loss caused by extreme cold. Field testing confirmed successful single-attempt startup at -15°C, validated on-site by the customer. 2. Low-Temperature Hydraulic Stability: Low-Temperature Hydraulic Oil and Anti-Gelling Hydraulic Lines Hydraulic system performance is central to sewer cleaning operations; however, at low temperatures, hydraulic oil viscosity increases and fluidity deteriorates, directly impairing boom extension/retraction and grab efficiency. Chengli’s solution employs HS-32 low-temperature hydraulic oil (operational range: -30°C to +80°C) and dual-layer anti-gelling hydraulic lines externally insulated with thermal insulation cotton to prevent internal oil solidification. Furthermore, the hydraulic reservoir integrates an automatic temperature-controlled heater that activates when oil temperature falls below -5°C, maintaining optimal hydraulic system operati