Pipe is a hollow tube with round cross section for the conveyance of products. The word pipe is used as distinguished from tube to apply to tubular products of dimensions commonly used for pipeline and piping systems. Pipe are made in many materials including ceramic, fiberglass, many metals, concrete and plastic. Typically metallic piping is made of steel or iron, such as unfinished, black (lacquer) steel, carbon steel, stainless steel or galvanized steel, brass, and ductile iron. Lead piping is still found in old domestic and other water distribution systems, but it is no longer permitted for new potable water piping installations due to its toxicity.
Many industrial and government standards exist for the production of pipe and tubing. There are three processes for metallic pipe manufacture. Seamless pipe withstands pressure better than other types, 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. Large-diameter pipe (25 centimetres (10 in) or greater) may be ERW, EFW or Submerged Arc Welded (“SAW”) pipe.
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