2022SY/T 6321-2022 Safety regulations for shallow sea oil production and underground operations
2016SY/T 6321-2016 Safety regulations for shallow sea oil production and underground operations
2008SY 6321-2008 Safety regulation of offshore oil recovery and downhole operation
1997SY 6321-1997 Safety regulation of offshore oil recovery and downhole operation
SY/T 6321-2016 Safety regulations for shallow sea oil production and underground operations has been changed from SY 6321-2008 Safety regulation of offshore oil recovery and downhole operation.