Petroleum and natural gas industries - Compact flanged connections with IX seal ring (ISO 27509:2012 + Cor. 1:2013); English version EN ISO 27509:2012 + AC:2013, only on CD-ROM— 115 стр.
Flanges and their joints - Bolting - Part 4: Selection of bolting for equipment subject to the Pressure Equipment Directive 97/23/EC; German version EN 1515-4:2009— 22 стр.