What is ISO 21905 about?
ISO 21905 discusses gas turbine exhaust systems with or without heat recovery. ISO 21905 specifies requirements and gives recommendations for the design, materials of construction, modelling, controlling, fabrication, inspection, testing, installation, start-up and operation of industrial gas turbine (GT) exhaust systems with or without waste heat recovery unit (WHRU). Gas turbines can be on-shore or off-shore for such sectors as oil and gas, chemical and process industries, utilities, or other intensive energy users.
For ISO 21905 , the exhaust system means all items in the turbine exhaust gas stream between the GT exhaust gas collector outlet flange and the termination/s to the atmosphere.
The following items are not covered by ISO 21905 :
heat recovery steam generator equipment (HRSG)
supplementary fired systems