Petroleum, petrochemical and natural gas industries - Pressure-relieving and depressuring systems (ISO 23251:2006); English version EN ISO 23251:2007— 199 стр.
Petroleum, petrochemical and natural gas industries - Pressure-relieving and depressuring systems (ISO 23251:2006); English version EN ISO 23251:2007, Corrigendum to DIN EN ISO 23251:2007-12; English version EN ISO 23251:2007/AC:2008— 3 стр.