9902.15.39 - Stationary steam turbines, condensing type, direct drive, suited for use with a generator, having an output of 60 MW or more but not over 120 MW, with a rotational speed more than 3500 RPM (provided for in subheading 8406.81.10)

This HTS classification, 9902.15.39, pertains to specific types of stationary steam turbines. These are condensing type turbines, designed for direct drive applications and intended for use with electricity generators. Crucially, these turbines must possess an electrical output capacity ranging from 60 megawatts (MW) or more, up to a maximum of 120 MW. Furthermore, they are distinguished by their rotational speed, which must exceed 3500 revolutions per minute (RPM). This detailed set of technical specifications identifies a very particular category of industrial machinery.

The primary distinction of this classification lies in its precise output power range and rotational speed requirements. While other steam turbines might exist within the broader machinery chapters of the HTS (such as Chapter 84), this 9902 code denotes a temporary or specific provision that overrides the standard classification under subheading 8406.81.10 for the purposes of this particular tariff item. This highlights the role of Chapter 99 in providing special provisions, temporary modifications, or additional restrictions that apply to certain goods, often based on policy initiatives or trade agreements, separate from the general classification system.

As a leaf node within the HTS, HTS code 9902.15.39 does not have further subcategories. Therefore, classification is complete once a stationary steam turbine meets all the specific criteria outlined: condensing type, direct drive, suited for generator use, with an output between 60 MW and 120 MW inclusive, and a rotational speed exceeding 3500 RPM. This ensures that only a very precise set of high-capacity, high-speed industrial turbines fall under this designation.