DIN EN ISO 27509:2021-05 Petroleum and natural gas industries - Compact flanged connections with IX seal ring (ISO 27509:2020); English version EN ISO 27509:2020, only on CD-ROM / Note: CD-ROM
2021DIN EN ISO 27509:2021 Petroleum and natural gas industries - Compact flanged connections with IX seal ring (ISO 27509:2020); English version EN ISO 27509:2020, only on CD-ROM
2019DIN EN ISO 27509:2019 Petroleum and natural gas industries - Compact flanged connections with IX seal ring (ISO/DIS 27509:2019); English version prEN ISO 27509:2019, only on CD-ROM
2013DIN EN ISO 27509:2013 Petroleum and natural gas industries - Compact flanged connections with IX seal ring (ISO 27509:2012); English version EN ISO 27509:2012, only on CD-ROM