Because 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).
Seamless Pipe is formed by forcing molten metal through a round die with a plug in the center to form a long tube of continuous metal which is then cut into appropriate lengths; usually either 21 ft or 40 ft. although other lengths are available. Seamless Pipe is more uniform in consistency unlike Rolled and Welded Pipe that has been seam welded. Seamless Pipe can also, usually, withstand higher operating pressures and temperatures than Weld Pipe so it is commonly preferred for use in high pressure systems. Fluid flow through Seamless pipe is generally less turbulent than Welded pipe also.
Seamless pipe refers to how the pipe is manufactured. Seamed pipe is produced a sheet of metal that is rolled into a tube and the seam is sealed in some manner, such as welding.
A seamless pipe is usually extruded and drawn in a single piece with no seam. Most all plastic pipe is made from extrusions and have no seam.
Seamless pipe tends to be stronger as there is no seam to fail.
