In article .com, wrote:

Doug Miller wrote:
In article .com,
wrote:

Pipe of the same nominal size is the same OD regardless of schedule,

but not the same regardless of material.
E.g. nominal 3/4" steel, copper, PVC,
and CPVC pipe are different sizes.


3/4" schedule 40 steel pipe has an OD Of 1.050" and a
wall thickness of 0.113" for an ID of 0.774".
[snip]

3/4" schedule 40 PVC pipe has an OD Of 1.050" and a
wall thickness of 0.113" for an ID of 0.774".

Quick measurements of actual pipes in my basement shows the following ODs for
nominal 3/4 pipe:
galvanized steel 1.060
sch 40 PVC 1.055
black steel 1.030
sch 40 CPVC 0.885
copper 0.875

--
Regards,
Doug Miller (alphageek at milmac dot com)

Nobody ever left footprints in the sands of time by sitting on his butt.
And who wants to leave buttprints in the sands of time?