UNE-EN ISO 27509:2020 Petroleum and natural gas industries - Compact flanged connections with IX seal ring (ISO 27509:2020) (Endorsed by Asociación Española de Normalización in February of 2021.)
2021UNE-EN ISO 27509:2020 Petroleum and natural gas industries - Compact flanged connections with IX seal ring (ISO 27509:2020) (Endorsed by Asociación Española de Normalización in February of 2021.)