The implementation standards for welded pipes mainly include the following:
GB/T 3091-2015: Applicable to welded steel pipes for low-pressure fluid transportation, mainly used for transporting low-pressure fluids such as water, gas, and air.
GB/T 9711-2017: Applicable to welded steel pipes for the petroleum and natural gas industry, with excellent properties such as high strength, corrosion resistance, and wear resistance, mainly used for pipelines in the fields of petroleum, natural gas, chemical industry, electricity, and water conservancy.
GB/T 13793-2008: Applicable to straight seam electric welded steel pipes, mainly used for general structures and mechanical structures.
GB/T 14291-2006: Applicable to welded steel pipes for mining fluid transportation, specially used for fluid transportation in mines.
Classification and application of welded pipes:
Structural welded pipes: Mainly used for the support of building structures, bridges, towers and other structures.
Fluid transport welded pipe: used to transport fluids such as water, oil, and gas.
Low-pressure fluid transport welded pipe: suitable for the transportation of low-pressure fluids, such as building water supply and drainage systems.
High-pressure fluid transport welded pipe: used for the transportation of high-pressure fluids, such as long-distance oil and natural gas pipelines.
Quality control of welded pipes:
Quality control of welded pipes is the key to ensuring their safe use. Quality control includes raw material inspection, welding process control, and finished product inspection. The specific steps are as follows:
Raw material inspection: inspect the chemical composition and mechanical properties of steel plates or steel strips to ensure that they meet standard requirements.
Welding process control: control welding parameters such as current, voltage, speed, etc. to ensure weld quality.
Finished product inspection: perform water pressure test, radiographic inspection, ultrasonic inspection, etc. on welded pipes to ensure that the welded pipes are defect-free.
