Correcting misinformation:

Pipe is NOT specified by inside diameter.
It is specified by a "trade size" that is is
associated with a specific outside diameter.
The inside diameter varies, depending on
which "schedule" it is (eg, 40 , 80, etc) and
what material it is made of. Generally,
for sch 40, the inside diameter is slightly
larger than the trade size, while for sch 80,
the inside diameter is slighly smaller than the
trade size. All "1 1/2 inch" pipe has an
outside diameter of 1.900 inches, regardless
of schedule/wall thickness/material. The schedule
numbers are arbitrary. For example, schedules
125 and 200 are thin wall sprinkler pipes, much
lighter than schedule 40.

The reference you give has incorrect information.
For example, it gives the outside diameter of 1 1/2 inch
trade size pipe incorrectly as 1 7/8 inches (1.875).

(BTW, flexible tubing is the only material specified by
inside diameter, AFAIK).

Rick N6RK


"Kingfish Stevens" wrote in message
...
On 31 Dec 2003 13:28:17 -0800, (Q) wrote:

Anyone know how aluminum pipe sizes work? Is there some kind of
industry standard that manufacturers follow and you can look up (for
finding wall thickness, telecoping lengths, etc)?

I've seen a couple of tables with specifications, however those seem
to always jump from 1/2" to 3/4" to 1"... at my local hardware store I
can get the 1/8"'s sizes in between (3/8, 5/8, 7/8, etc) which has me
confused. Are those 1/8" based sizes standard, or some kind of non
standard product?

These two pages should help you understand the sizes.
73
Kingfish

http://www.rondexter.com/professiona...be_conduit.htm


http://www.rondexter.com/professiona...e_and_tube.htm

On Thu, 01 Jan 2004 18:43:06 GMT, "Rick Karlquist N6RK"
wrote:

Correcting misinformation:

Pipe is NOT specified by inside diameter.
It is specified by a "trade size" that is is
associated with a specific outside diameter.
The inside diameter varies, depending on

Yes, this is highly nominal. Trade size is a good way to put that. A
fair amount of variability is possible. At one point, decades ago,
these sizes related to the ID more or less, but enhancements in
materials allowed for thinner walls in the piping, while still using
legacy fittings sized to the outer dimension.

Tubing in various materials, is most often specified by O.D, and then
wall thickness. This includes various metals, aluminum, copper, etc,
rigid plastics like PVC or CPVC, etc, and many of the flexible tubings
out there. Tolerances tend to be much tighter than on pipe. There are
separate series of some tubings in metric.

Various suppliers of tubing and fittings include useful reference info
in their catalogs.

Considering where this was posted, I assume that the OP wants nesting
tubing for making an antenna. If so, see:
http://www.texastowers.com/aluminum.htm

Happy trails,
Gary (net.yogi.bear)
------------------------------------------------
at the 51st percentile of ursine intelligence

Gary D. Schwartz, Needham, MA, USA
Please reply to: garyDOTschwartzATpoboxDOTcom