Steel Pipes by Types » Standard Steel Pipes & Tubes

Pipes can be of different sizes according to the usage that is - high or low pressure exposure so, thus the size or measurement of the pipes or tubes defines their usage. The diameter of the steel pipe is modified depending on usage as well the wall thickness. Welded non-alloy steel pipes of circular cross-section not more than 406.4 millimeters (16 inches) outside diameter steel pipes are categorized under “Standard Steel Pipes”. Regardless of wall thickness, the surface finish of standard steel pipes could be black, galvanized, or painted whereas the end finish can be plain, beveled, threaded, or threaded and coupled. The standard size unfinished conduit steel pipe also comes under the same category.

These standard steel pipes are intended for the low pressure conveyance of water, steam, natural gas, other liquids and gases in plumbing and heating systems, air conditioning units, automatic sprinkler systems, and other related usage. Standard steel pipes and tubes may also be used for light load-bearing applications such as, fence tubing, structural pipe tubing of framing and support members for reconstruction or load-bearing purposes in the construction, shipbuilding, trucking, farm equipment, and related industries.

The Standard Steel Pipe could be either seamless, single welded seam or electric resistance welded.

• Seamless:
  This is formed by drawing a solid strap on the piercing rod and make a hollow shell. A seamless pipe can resist more pressure, and also more available than the welded ones. These pipes are called as cold drawn seamless pipes. It is mostly used in machining parts, cylinders of high tensile up to 75000 PSI. These pipes are generally lighter with thinner walls and mostly used for transporting liquids.
  
  
• Welded Seam:
  In welded seam pipes, the edges of two pipes are brought together and sealed. They are more heavier and tough, straighter and consistent. These pipes are mostly used for gas transportation and plumbing. It is rarely used under high pressure.