The bar is heated to a high temperature and then a probe is inserted to create a hole through the cylinder. Seamless pipe is formed from a cylindrical bar of steel.
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Pipe classification by manufacturing process. Higher temperatures are required to produce pipes with thicker walls which reduces deformation resistance resulting in a larger deflection ( XINLIN, 2014).įigure 1.20. In general, the application of seamless pipes depends on the thickness of the pipe wall. According to ASME, these pipes are also more effective in withstanding mechanical stress and have a higher operating pressure than welded pipes which are known as nonseamless pipes ( Ferrostaal, 2017). In comparison to other types of piping, seamless pipes do not require any welding or joints and are simply formed by solid round billets, which adds on to its strength and other characteristics including corrosion resistance. Seamless pipes are generally used in gas lines, as well as pipes that carry liquids ( JSTEEL, 2017).īecause seamless pipes are able to withstand high pressures, they are also widely used in high-pressure applications including refineries, hydraulic cylinders, hydrocarbon industries, and in Oil and Gas infrastructure ( Pearlite Steel, 2017). These kinds of pipes are known for their ability to withstand pressure more efficiently in comparison to other methods of pipe manufacturing processes, as well as being fast and cost-effective. Seamless pipes are derived from solid steel that is in sheet or bar form and is formed into a solid round shape known as “billets” which are then heated and cast over a form such as a piercing rod to create a hollow tube or shell. Dr.Mojtaba Mahmoodian, in Reliability and Maintainability of In-Service Pipelines, 2018 Seamless pipes