Steel Pipe

Most steel pipe is made from carbon steel. Carbon steel pipe is available in Grade A, Grade B and , in a few cases, in Grade C. Because of a higher carbon content, Grade B and C have higher tensile strength than Grade A, But are less malleable.


Pipe in sizes from 1/8" through 12" is known by its nominal inside diameter.

For sizes larger than 12", pipe is known by its actual outside diameter and the wall thickness is stated.


To distinguish different weights of pipe, three traditional designations are used:


  • Standard wall (Std)
  • Extra strong wall (XS)
  • Double extra strong (XXS) or extra heavy (XH) or double extra heavy (XXH)



Steel Pipe Types:

  • Type F - butt welded
  • Type E - electric resistance (replacement of the lap welding)
  • Type S - seamless pipe.




7.2.6.7.

  1. Except as provided in Sentences (2) and (3), welded and seamless steel pipe shall not be used in a plumbing system. (See Appendix A.)
  2. Galvanized steel pipe may be used in a drainage system or a venting system above ground inside a building.
  3. Galvanized steel pipe shall not be used in a water distribution system except
  1. in a building of industrial occupancy, or
  2. for the repair of existing galvanized steel piping system.
  1. Galvanized steel pipe and fittings shall conform to ASTM A53...
  2. Where galvanized steel pipe is used in a drainage system, it shall be used with drainage fittings.
  3. All steel pipe of 4" size and smaller shall be schedule 40 or heavier and fittings of less than 2" size shall be galvanized screw fittings.


7.3.3.3. (2)

Galvanized steel pipe and fittings shall not be welded.


7.3.4.5.(2)(a) Galvanized iron or steel pipe is supported at intervals not exceeding

  1. 3.75 m if the pipe is 6" or more,
  2. 2 500 mm if the pipe is less than 6".