RE: wall thk spreadsheet?

the mill tolerance is dictated by the Purchase Specification. Say you want an A106-B, the supplier will have to comply with ASTM. In this case its 12.5%. Para 16.3 (ASTM Designation A106) Thickness - the min. wall thcikness to any point shall not be more than 12.5% under the nominal wall thickness specified.

For me, its the E factor that will have considerable effect on the wall thckness (hence the cost) since it varies from 0.8 to 1.0.

If i may add, we now use the term NPS (also dimensionless) to designate pipe size..

> ----------
> From: Ben Nottingham[SMTP:bnottingham@chartertn.net]
> Subject: RE: [PipingDesign] wall thk spreadsheet?
>
> Look at the ASTM Specifications for mill tolerances of copper
> pipes/tubes and alloy pipes made from plate/sheet. They are
> not always minus 12.5% mill tolerance.
>
> Some pipes are ordered with a minimum wall thickness, in
> which case you can use a zero mill tolerance in the calcs.
>
>
Received on Thu Oct 04 02:11:00 2001