Project Background: Urgent Sewer Cleaning Requirements in Benxi City’s Urban Area Benxi City, located in eastern Liaoning Province and situated in a mountainous region, has long faced challenges such as sediment accumulation and debris blockages in its urban drainage pipeline network. In April 2026, the Benxi Municipal Engineering Management Office launched a special sewer cleaning project for the city’s drainage network and urgently required procurement of highly efficient, highly maneuverable cleaning vehicles for routine pipeline maintenance and emergency unclogging during the rainy season. Key vehicle requirements specified by the project owner included: blue license plate eligibility (drivable with a Class C driver’s license), minimum 3-cubic-meter sludge storage capacity, reliable chassis, and short delivery lead time. After comprehensive evaluation, the project owner selected the Dongfeng Dual-Cab Blue-Plate 3-cubic-Meter Sewer Cleaning Vehicle supplied by Chengli Special Purpose Vehicle Co., Ltd. (hereinafter referred to as “Chengli”). This model features a Dongfeng chassis compliant with China VI emission standards and complete official vehicle type approval documentation, enabling nationwide registration. Chengli secured the bid based on key competitive advantages: factory-direct sales (eliminating intermediaries), a rapid 10-day delivery cycle, and lifetime after-sales support for the superstructure. The delivered unit is the Chengli CLW5040TQYD6 sewer cleaning vehicle (example type approval number), equipped with a hydraulic grabber, high-pressure cleaning system, and a 3-cubic-meter sealed tank—specifically engineered for narrow urban streets and residential area pipelines. The total contract value is RMB 128,000 (tax-inclusive landed price), covering freight and license plate registration services—approximately RMB 14,000 lower than quotations from local 4S dealerships. Solution: Chengli-Dongfeng Dual-Cab Blue-Plate 3-cubic-Meter Sewer Cleaning Vehicle—Model Selection & Configuration To meet the specific operational conditions of the Benxi project site, Chengli’s solution focuses on the following critical aspects: Chassis Selection: Dongfeng dual-cab configuration powered by a Quanchai Q23-95E60 engine (95 hp, China VI compliant) paired with a 5-speed manual transmission and a wheelbase of 3,308 mm. The dual-cab accommodates up to five personnel, supporting team-based operations. The chassis is covered under Dongfeng’s nationwide authorized warranty, ensuring reliable after-sales service. Superstructure Configuration: Tank effective capacity: 3 m³, fabricated from Q235 carbon steel with internal anti-corrosion treatment. Equipped with a hydraulic hose reel, 10-meter suction hose, and a hydraulic grabber (maximum lifting height: 5 meters) capable of removing hard obstructions such as bricks, stones, and compacted sludge from manholes. High-pressure cleaning system: operating pressure 16 MPa, flow rate 30 L/min—optimized for pipeline clearing. Regulatory Compliance: Full type-approval documentation available; meets China VI emission standards; qualifies for blue license plate registration and operation with a Class C driver’s license. Gross vehicle weight: 4,495 kg; kerb weight: 2,870 kg; rated payload: 1,495 kg. The Benxi City Vehicle Administration has confirmed eligibility for standard registration, annual inspection, and commercial operation permit issuance. Delivery Timeliness: Chengli’s Suizhou manufacturing facility operates on a zero-inventory dispatch model, with standard models delivered within 7–15 days. For the Benxi project, production was completed and shipment dispatched on Day 10 following contract signing, and the vehicle arrived at the Benxi project site on Day 12—fully meeting the urgent schedule requirement. Below are the key technical parameters and configuration details of the delivered vehicle: | Parameter | Specification/Value | |-----------|-----------------