Diameter Problem

It is much too long a story to tell in a brief thread.

It's how they make the pipe stronger.

Always be sure that outside diameter of the hole in your pipe does not exceed the outside diameter of the pipe itself. If this happens, you will not be able to see the pipe, until it has been filled with fluid and you may find that the pipe is in the wrong place.

The inside diameter of the pipe should = the outside diameter of the hole. The inside diameter of the hole can only be determined after the pipe has been put into service.

Pipes work best if the hole and the pipe are the same length.

Last, but not least, never try to use a schedule 100 hole in schedule 80 pipe. No sense in using more hole than needed.

Good luck,

Pipe is about the 'hole' as Lyn has observed _[LOL,PMS]

A schedule refers to a 'nominal standard pipe'.

Because pipes in a schedule are sized in external dies the OD's are the same [so fittings fit], the wall changes from lite, to medium, to heavy, to extra heavy, etc. this means the bore (hole) changes.

I.e. as Tornado observed it would take too long to explain how, or why, this 'system' came to be - so just use the tables and after a while you come to know the dimensions.

Thanks for your help guys.