ISO 21789:2009 Preview
Gas turbine applications -- Safety
ISO 21789:2008 covers the safety requirements for gas turbine applications using liquid or gaseous fuels and the safety-related control and detection systems and essential auxiliaries for all types of open cycles (simple, combined, regenerative, reheat, etc.) used in onshore and offshore applications including floating production platforms.
ISO 21789:2008 applies to driven machinery only where it is an integral part of the gas turbine (e.g. a gearbox integral to the gas turbine), or is located within the gas turbine enclosure and forms part of the enclosure hazardous-area classification (e.g. a generator within the gas turbine enclosure), or where the driven machinery has a direct effect on the operational safety of the gas turbine.
ISO 21789:2008 details the anticipated significant hazards associated with gas turbines and specifies the appropriate preventative measures and processes for reduction or elimination of these hazards. ISO 21789:2008 addresses the risks of injury or death to humans and risks to the environment. Equipment damage without risk to humans or the environment is excluded.
Gas turbine packages are generally specified using International Standards and national standards. Achieving safety is promoted by using additional safety codes and standards, which are shared by gas turbines with other technologies. It is necessary to recognize that local legislation in the country in which the equipment is being used might not be covered by ISO 21789:2008.
ISO 21789:2008 excludes gas turbines used primarily for direct and indirect propulsion, special heat source applications and in research and development programmes. It also excludes gas turbines for closed-cycle and semi-closed cycle applications, and compressed-air energy storage plants. Where appropriate, ISO 21789:2008 can be used to give general guidance in such applications.
ISO 21789:2008 is not applicable to machinery or safety components that were manufactured before the date of its publication as an International Standard.