1. Within 50 meters of the installation place the insulating joint, avoid welding dead joints.2. After the insulating joint is connected to the pipeline of the oil casing, it is not allowed to lift the pipeline within 5 meters of the joint. Must be pressure tested with the pipeline.3. After the insu

1. The straight seam steel pipe is bent in the same direction as the weldReason: Insufficient normalizing treatment of the weld seam, thermal stress exists on the side of the pipe near the weld seam, so it bends in one direction after cooling.Solutions: 1. Adjust the middle roller to increase the de

The causes of surface defects of seamless steel pipes are intricate. There are hundreds of influencing factors listed, and sometimes there are dozens of factors for the same defect, and the occurrence of defects has a great relationship with the steel type. This is why the production of seamless ste

Steel Pipe Corrosion prevention always is a problem for big project construction. The steel pipe anti-corrosion using transport pipeline cited by the use of the environment and transport medium shadow pipeline corrosion chemical or electrochemical reaction. Or by the metabolic activities of microorg