Domestic water systems Pipelines transporting gas or liquid over long distances Scaffolding Structural steel As components in mechanical systems such as: Rollers in conveyor belts Compactors (E.g.: steam rollers) Bearing casing Casing for concrete pilings used in construction projects High temperature or pressure manufacturing processes The petroleum industry: Oil well casing Oil refinery equipment Delivery of fluids, either gaseous or liquid, in a process plant from one point to another point in the process Delivery of bulk solids, in a food or process plant from one point to another point in the process The construction of high pressure storage vessels (note that large pressure vessels are constructed from plate, not pipe owing to their wall thickness and size).
There are three processes for metallic Pipe production line manufacture. Centrifugal casting of hot alloyed metal is one of the most prominent process.[further explanation needed] Ductile iron pipes are generally manufactured in such a fashion. Seamless (SMLS) pipe is formed by drawing a solid billet over a piercing rod to create the hollow shell. Historically seamless pipe was regarded as withstanding pressure better than other types, and was often more easily available than welded pipe. Advances since the 1970's in materials, process control and non-destructive testing allow correctly specified welded pipe to replace seamless in many applications. 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 to make the seam less visible. Welded pipe often has tighter dimensional tolerances than seamless, and can be cheaper if manufactured in the same quantities. Large-diameter pipe (25 centimetres (10 in) or greater) may be ERW, EFW or Submerged Arc Welded ("SAW") pipe.