scope:

Specifies general requirements intended to facilitate the procurement and supply of steam turbines and gas expansion turbines primarily for industrial applications. Should serve as a basis for any application although, for special applications, supplementary specifications may also be required, for example for general and special purpose industrial steam turbines used in the petroleum and natural gas industries. Is applicable to axial- and radial-flow industrial-type turbines (steam turbines and gas expansion turbines). It specifies the basic requirements for single-stage and multi-stage impulse orreaction turbines, which are not spared or are in critical service.