2012SY/T 5027-2012 Pneumatic components for petroleum drilling and production equipment
2006SY/T 5027-2006 Pneumatic components for petroleum drilling and production equipment
1991SY/T 5283-1991 Quality Classification of Pneumatic Components Used in Petroleum Drilling Equipment
SY/T 5283-1991 Quality Classification of Pneumatic Components Used in Petroleum Drilling Equipment was changed to SY/T 5027-2006 Pneumatic components for petroleum drilling and production equipment.