UNE-EN ISO 28781:2010 Petroleum and natural gas industries - Drilling and production equipment - Subsurface barrier valves and related equipment (ISO 28781:2010) (Endorsed by AENOR in October of 2010.)
2010UNE-EN ISO 28781:2010 Petroleum and natural gas industries - Drilling and production equipment - Subsurface barrier valves and related equipment (ISO 28781:2010) (Endorsed by AENOR in October of 2010.)