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