Measure the outside diameter of a pipe with some calipers. If you don't have these then you can get a good idea by using a ruler or tape measure, making sure to go through the mid point. It's outside wall to outside wall.
1/8 pipe schedule
OD is Outside Diameter - at least when you are talking about pipe...
id means inside diameter, od means outside diameter, copper pipe and tubing is measured by the od, therefore the od the pipe or tubing will be the same as the id of the fitting
14" and above
outside to outside
89mm
Can you calculate the ID of a pipe when you have the OD to be 10.75" and the wall thickness to be 0.5"Depends on what you know about it. If you have the outer diameter and you know the wall thickness, then ID = OD-2 x wall thickness
NB = inside diameter of the tube. OD = outside diameter of the tube.
The outside diameter (OD) of a 40-inch nominal bore black steel pipe is typically 40 inches, as the nominal size refers to the approximate internal diameter of the pipe. However, the actual OD for standard pipe sizes can vary; for a 40-inch nominal bore, the standard OD is approximately 42.16 inches according to the American National Standards Institute (ANSI) specifications. This discrepancy is due to the wall thickness of the pipe, which is accounted for in the nominal size.
what is difference between NB & OD in pipe size
2 9/16"
Bevel inside of sch. 80 to match OD of sch. 40