Improving the service life of LSAW Steel Pipes (straight seam submerged arc welded steel pipes) can be approached from the following aspects:

Optimize production process

Strictly control the quality of raw materials: select high-quality steel as raw materials to ensure that their chemical composition, mechanical properties, etc. meet relevant standards and design requirements. Strictly inspect the incoming raw materials, including chemical composition analysis, tensile testing, impact testing, etc., to prevent unqualified raw materials from entering the production process.

Precise control of welding process parameters: Welding is a key process in the production of LSAW steel pipes. Precise control of welding current, voltage, welding speed and other parameters ensures the quality of the weld seam. By adopting advanced welding equipment and technologies such as automatic submerged arc welding and gas shielded welding, the stability and consistency of welding are improved, welding defects are reduced, and the overall strength and corrosion resistance of steel pipes are enhanced.

Reasonable heat treatment process: Based on the material and usage requirements of the steel pipe, develop a reasonable heat treatment process, such as normalizing, tempering, etc. Heat treatment can improve the metallographic structure of steel pipes, refine grain size, eliminate welding stress, and enhance the mechanical properties and corrosion resistance of steel pipes.

Strengthen surface protection

Anti corrosion coating treatment: Coating the surface of steel pipes with anti-corrosion coatings is one of the important measures to extend their service life. Common anti-corrosion coatings include epoxy powder coating, polyethylene coating, polyurethane coating, etc. Select appropriate anti-corrosion coatings according to different usage environments and media, and ensure that the coating thickness is uniform and the adhesion is strong, which can effectively isolate the steel pipe from contact with external corrosive media.

Galvanizing treatment: For some LSAW steel pipes used in general atmospheric environments, galvanizing treatment can be used. The galvanized layer can form a dense protective film on the surface of the steel pipe, preventing oxygen and moisture from contacting the steel pipe substrate, thus playing a role in corrosion prevention. There are two methods of galvanizing: hot-dip galvanizing and electroplating galvanizing. Hot dip galvanizing has a better anti-corrosion effect, but the cost is relatively high.

Reasonable design and installation

Optimize pipeline system design: When designing pipeline systems, fully consider factors such as working pressure, temperature, and medium characteristics of the pipeline, and reasonably select the specifications, wall thickness, and material of steel pipes. Avoid stress concentration, fluid turbulence, and other situations in the pipeline system that are detrimental to the service life of steel pipes. For example, in the bends, tees, and other parts of pipelines, reasonable curvature radii and reinforced structures are used to reduce local stress concentration.

Correct installation and fixation: When installing LSAW steel pipes, strictly follow the installation operation procedures to ensure that the pipeline is firmly connected and well sealed. To avoid additional stress, deformation, or damage to the anti-corrosion coating of the steel pipe caused by improper installation. At the same time, reasonable support and fixing devices should be set up for the pipeline to prevent excessive displacement and deformation due to factors such as self weight and vibration.

Daily maintenance and management

Regular inspection and monitoring: Establish a comprehensive pipeline inspection system, conduct regular visual inspections, wall thickness measurements, non-destructive testing, etc. on LSAW steel pipes in use, and promptly detect defects such as corrosion, wear, and cracks on the surface of the steel pipes. For some important pipeline systems, online monitoring technology can be used to monitor the operation status of steel pipes in real time, such as changes in parameters such as pressure, temperature, flow rate, etc., in order to detect potential safety hazards in a timely manner.

Timely repair and replacement: For steel pipe defects discovered during inspection, timely repair or replacement measures should be taken according to the severity of the defects. For minor corrosion, wear and other defects, repair, polishing and other methods can be used for repair; For serious defects such as extensive corrosion, deep cracks, etc., damaged steel pipe sections should be replaced in a timely manner to ensure the safe operation of the pipeline system.

Environmental control and management: Control the usage environment of steel pipes, and take corresponding protective measures for some highly corrosive media such as acids, alkalis, salts, etc., such as adding corrosion inhibitors and adjusting the acidity and alkalinity of the media. At the same time, keep the surrounding environment of the steel pipe dry and clean, avoid contamination such as water immersion, oil stains, dust, etc., and reduce the probability of corrosion.