Pipe(Tube)
We are a worldwide supplier of a wide range of pipe and tubular products manufactured to several long-standing and broadly applicable industrial standards (such as ASME/ANSI B36.10/B36.19). We deliver complete packages from our strategically selected stockists locally or around the world. We serve the petrochemical, chemical industry, oil and gas industry as well as power plants and other industries.
Applications:
Pipelines, Process Equipment, Structural steel, Shipbuilding, Aerospace, Automotive, Hydraulics
Types:
SMLS pipe is formed by drawing a solid billet over a piercing rod to create the hollow shell. Seamless pipe provides the most reliable pressure retaining characteristics, and is often more easily available than welded pipe.
Welded (also Electric Resistance Welded (ERW) and Electric Fusion Welded (EFW)) pipe is formed by rolling plate and welding the seam. The weld flash can be removed from the outside or inside surfaces using a scarfing blade. The weld zone can also be heat treated, so the seam is less visible. Welded pipe often has tighter dimensional tolerances than seamless, and can be cheaper if manufactured in the same quantities. Large diameter pipe (about 10 inches or greater) may be ERW, EFW or Submerged Arc Welded (SAW) pipe.
Electrical Resistance Welded(ERW) pipe is formed into a shape by cold forming method and joined under electrodes carrying high frequency resistance welder or high frequency or medium frequency induction heating welder. The hot rolled coil edges reaching melting temperature through the resistance shown by steel to applied high electrical current, are welded together without using any filler material. ERW pipes are widely preferred especially in Oil and Gas transportation lines.
Spiral Welded Pipe, hot coil produced on a powerful, precision rolling hot strip mill is uncoiled, and its leading end is joined to the trailing end of preceding strip by tandem electrode submerged arc welder to form an endless strip. The forming case shapes the strip into a cylindrical shell with a spiral seam, which is welded by tandem SAW equipment first inside, and the outside.
Pipe Sizes
Pipe sizes are documented by a number of international standards, including API 5L, ANSI/ASME B36.10M and B36.19M in the US, BS 1600 and BS EN 10255 in the United Kingdom and Europe. There are two common methods for designating pipe outside diameter (OD).
The North American method is called NPS ("Nominal Pipe Size") and is based on inches (also frequently referred to as NB ("Nominal Bore")). The European version is called DN ("Diametre Nominal" / "Nominal Diameter") and is based on millimetres. Designating the outside diameter allows pipes of the same size to be fit together no matter what the wall thickness.
both methods give a nominal value for the OD that is rounded off and is not the same as the actual OD. For example, NPS 2 inch and DN 50 are the same pipe, but the actual OD is 2.375 inch, or 60.325 mm. The only way to obtain the actual OD is to look it up in a reference table.
the NPS size is the actual diameter in inches and the DN size is equal to NPS times 25 rounded to a convenient multiple of 50. For example, NPS 14 has an OD of 14 inches, or 355.6 mm, and is equivalent to DN 350.
