Meaning of NB, NPS and OD of a Pipe?

NB, NPS and OD of a Pipe?

What is NB & OD?

NB: 

What is the Nominal bore?

Nominal bore kya Hota hai? explain in Hindi.

-NB means Nominal Bore.

-The internal diameter of a pipe in millimetre (mm) is called as Diameter Nominal or Nominal diameter or Nominal Bore.

-NB is European designation of pipe equivalent to NPS.

NPS
- NPS means Nominal Pipe Size

- It is North American equivalent to NB.

- NPS is frequently used in place of NB.

- It is expressed in inches.

OD:

-OD means Outside Diameter of a pipe.

- It is expressed in millimetre (mm).

T:

- It is the Thickness of pipe.

- It is the difference between OD and NB.
- [T=OD-NB]