ISO 3977-3:2004涵盖了采购商从包装商处采购燃气轮机和燃气轮机系统（包括用于联合循环系统的燃气轮机及其辅助设备）的所有应用的设计要求。它还提供用于采购的协助和技术信息。 其目的不是处理可能要求安装符合的地方或国家立法要求。 ISO 3977-3:2004适用于在开放系统中工作的简单循环、联合循环和再生循环燃气轮机。它不适用于用于驱动飞机、道路施工和土方机械、农业和工业拖拉机以及道路车辆的燃气轮机。 在燃气轮机使用特殊热源的情况下（例如，化学工艺、核反应堆、超级加热炉）- ISO 3977-3:2004提供了基础。

ISO 3977-3:2004 covers the design requirements for the procurement of all applications of gas turbines and gas turbine systems, including gas turbines for combined cycle systems and their auxiliaries, by a purchaser from a packager. It also provides assistance and technical information to be used in the procurement. It is not intended to deal with local or national legislative requirements with which the installation may be required to conform. ISO 3977-3:2004 is applicable to simple-cycle, combined-cycle and regenerative-cycle gas turbines working in open systems. It is not applicable to gas turbines used to propel aircraft, road construction and earth moving machines, agricultural and industrial types of tractors and road vehicles. In cases of gas turbines using special heat sources (for example, chemical process, nuclear reactors, furnace for a super-charged boiler), ISO 3977-3:2004 provides a basis.