Government procurement case in Lhasa: Interpretation of framework agreement procurement and bidding-winning solution for CN6 Dongfeng 3308 mm wheelbase sewage treatment vehicles. Located on the Qinghai-Tibet Plateau, Lhasa features high altitude and cold climate; its severe winter low temperatures impose stringent requirements on specialized vehicles’ freeze-resistant starting capability and hydraulic system stability. In recent years, with growing urban environmental governance needs, a local municipal sanitation department planned to procure a batch of sewage treatment vehicles for municipal pipeline maintenance and emergency sewage handling. This procurement adopted a framework agreement model—qualified suppliers were selected via open tendering, with subsequent orders triggered based on actual operational demands. Based on publicly available tender information and industry practices, this article interprets the background, procedural flow, and CLW Special Purpose Vehicle Co., Ltd.’s competitive advantages in responding to this case. I. Framework Procurement Background and Core Requirements In late 2025, a municipal sanitation department in Lhasa launched a framework agreement procurement project for sewage treatment vehicles, with a total budget capped at approximately RMB 2.244 million, targeting the purchase of three CN6-emission-compliant sewage treatment vehicles built on the Dongfeng 3308 mm wheelbase chassis. Aligned with local government procurement conventions, the project placed particular emphasis on vehicle adaptability to plateau and low-temperature environments—including freeze-resistant starting performance, hydraulic system stability under sub-zero conditions, and comprehensive winter maintenance plans. Vehicles were required to comply with CN6 emission standards, possess sewage suction, solid-liquid separation, and emergency treatment capabilities, and operate reliably—including normal engine start-up—at ambient temperatures as low as -20°C. II. Supplier Qualification Process and Selection Per the framework agreement procurement procedure, the municipal sanitation department issued an open tender specifying that bidders must supply fully CN6-compliant special-purpose vehicles, accompanied by original-chassis manufacturer warranty coverage and lifetime after-sales service commitment for the superstructure. CLW Special Purpose Vehicle Co., Ltd., leveraging its extensive experience and proven track record in the sanitation vehicle sector, successfully qualified as a shortlisted supplier. The offered product was based on the Dongfeng 3308 mm wheelbase chassis (referencing technical specifications of model CLW5070GSSD6), with complete official vehicle type approval documentation meeting Lhasa’s registration and annual inspection requirements. During evaluation, expert reviewers focused closely on the vehicle’s low-temperature starting system: CLW vehicles are equipped as standard with engine pre-heating devices and antifreeze coolant circulation systems, ensuring rapid diesel engine start-up under high-altitude, low-temperature conditions. Additionally, the hydraulic system employs low-temperature-resistant hydraulic oil and sealing components to prevent leakage or sluggish actuation in freezing environments. These technical strengths—combined with CLW’s just-in-time delivery capability from its Suizhou production base (standard models delivered within 7–15 days)—proved decisive in securing its selection. III. Order Triggering Mechanism and Execution Details Following execution of the framework agreement, orders followed a ‘demand-triggered’ model. In early 2026, the municipal sanitation department issued its first order, procuring two sewage treatment vehicles at a unit price of approximately RMB 600,000 (per publicly disclosed tender data). Upon receipt of the order, CLW promptly initiated production—sourcing the chassis and completing superstructure assembly entirely at its Suizhou facility. At delivery,