... system certification and the API certification The API certificate number as follows: the sucker rod No. 11B-0081, drill collar No. 7-1-0552 ... , drill pipe, No. 5D-0104, tubing ... production capacity: 1,Sucker rod 12 million m / year2,Drill Collar 10000pcs/year3,Drill pipe 20,000 tons / year4,Oil tube(upset) 40 ...