EN ISO 27509:2012/AC:2013 Petroleum and natural gas industries - Compact flanged connections with IX seal ring - Technical Corrigendum 1 (ISO 27509:2012/Cor 1:2013)
2020EN ISO 27509:2020 Petroleum and natural gas industries - Compact flanged connections with IX seal ring (ISO 27509:2020)
2013EN ISO 27509:2012/AC:2013 Petroleum and natural gas industries - Compact flanged connections with IX seal ring - Technical Corrigendum 1 (ISO 27509:2012/Cor 1:2013)
2012EN ISO 27509:2012 Petroleum and natural gas industries - Compact flanged connections with IX seal ring (ISO 27509:2012)