We have established complete quality control system, and managing which is strictly according to quality system. We have passed ISO9001 quality control and occupancy permit of  API SPEC 5D(0079),API SPEC7(0477) . There is magnetic particle test, ultrasonic inspection, hardness testing,thicknees testing of ultrasonic,screw thread testing and other well-equipment. We are possessed with physical and chemical inspection laboratory which can conduct processibility inspection and performance test. Be full of people with complete and qualified inspection.     Strictly according to ISO9001 international standard ,and we conduct standardization managing and control in designing, producing, installation and service, etc, have established a set of complete enterprise standard and enterprise system which make better improvement of the quality control system.