NF M87-230-4*NF EN ISO 10438-4:2009 Petroleum, petrochemical and natural gas industries - Lubrication, shaft-sealing and control-oil systems and auxiliaries - Part 4 : self-acting gas seal support systems.
2009NF M87-230-4*NF EN ISO 10438-4:2009 Petroleum, petrochemical and natural gas industries - Lubrication, shaft-sealing and control-oil systems and auxiliaries - Part 4 : self-acting gas seal support systems.