Quality Control Of Raw Materials

◆ We will conduct a comprehensive evaluation of suppliers in strict accordance with relevant national technical requirements. Most of our suppliers are well-known large enterprises in China's steel production.
◆ The size, material and related materials of raw materials are checked and accepted according to the national standards.
◆ Perform ultrasonic flaw detection on each batch of steel.
◆ Carry out chemical composition analysis for each batch of incoming steel during acceptance.
◆ Test the mechanical properties of each batch of steel.

Quality Control Of Purchased Parts, Seals And Outsourced Parts

◆ After the purchased parts and outsourced parts arrive, the production department and the production department will fill in the "Incoming Inspection Notice" respectively, and the inspectors will inspect them according to the national industry standards, product processing drawings and the requirements of "Purchasing Control Procedures".
◆ After the inspector has passed the acceptance inspection, he will issue a document "Material Acceptance Form", which is a certificate of quality acceptance, and the warehouse administrator will go through the storage procedures. Those that fail to pass the inspection shall be disposed of according to the "Control Procedure for Unqualified Products".
◆ Seals: 100% visual and dimensional inspection of each seal, 50% dimensional spot check with measuring instruments and hardness test of seals.
◆ Sealing ring: 100% appearance and size inspection of each sealing ring, for the test of sealing and heat resistance, we design and manufacture a special test device, equipped with heating and insulating equipment, so as to facilitate the downhole temperature and pressure acceptance.