Round Steel Galvabond Caps


Refer to above diagram

Nominal Bore (NB) is the inside diameter of the pipe

Outside diameter (OD) is the outside diameter of the pipe.

T - The wall thickness of the pipe. The greater the thickness the outside diameter expands not the inside diameter.

Pipe has always been supplied by this way. Mainly pipe is used in the Gas and water industry so the inside diameter is important. The more water and gas the more pressure and the thicker the wall thickness need to be. In saying that there is round gal pipe designed for structural use. 

We have two different types of caps below. One is Galvabond and the other is galvanized. The difference between the two are:

  • GALVABOND is a zinc-coated commercial forming steel with a spangled surface unlike Galvanized Hot Dip. 
  • Galvanization - This is a process of applying a zinc protective coating to steel, to prevent it from rusting. One of the most common methods is hot-dip galvanizing, which involves submerged parts in a tank of molten zinc.