"Peter Grey" wrote in message
ink.net...

"Harold & Susan Vordos" wrote in message That has
nothing
to do with what distinguishes tubing from pipe. Tubing
comes seamless, drawn over a mandrel, drawn over a mandrel- special
smooth
ID, cold drawn butt welded and electric resistance welded. Some of
these
descriptions match pipe perfectly.

It's the size of the material that determines what it is, not the method
by
which it is manufactured. Both tubing and pipe are available in
steel,
stainless steel and aluminum, too.

Harold

So Harold,

A piece of tubing with the same dimensions, made by the same method, made
from the same material is functionaly the same as a piece of pipe made the
same way? How does one get identified as "pipe" and the other as
"tubing".
Is it purely how the two are measured and how their dimensions are
represented? Why would these be labeled differently? Is one commonly
available in one form that the other is not?

Puzzled,

Peter

In sizes up to 3/4" pipe, there are no identical matches of sizes with
tubing, so pipe is unique. At 1", pipe is designated as 1.315" OD. There
are several listings of tubing with identical, or very close, sizes when
compared to various schedules of pipe. With that in mind, unless the piece
in question is marked, or you have certs, it's possible you can't discern
one from the other. For example:

ASTM A 53 Grade A and Grade B, ASME Boiler and Pressure Vessel Code
Specifications SA 53, Grade B (seamless or welded type E)

Should you encounter a piece that is either welded or seamless, and the
dimensions match both tubing and pipe, without markings there may not be a
way to tell. I'm not sure it matters unless the pipe/tubing must meet
certain requirements (as above). Back to the certified material!

Harold