On Apr 10, 2006, at 11:37 AM, John Luf wrote:
> "323.1.2 Unlisted Materials. Unlisted materials may
> be used provided they conform to a published specification
> covering chemistry, physical and mechanical properties,
> method and process of manufacture, heat
> treatment, and quality control, and otherwise meet the
> requirements of this Code. Allowable stresses shall be
> determined in accordance with the applicable allowable
> stress basis of this Code or a more conservative basis."
This is what I meant, and I figured it was what you meant. If you have
a material you want to use, you need to do some testing (or use the
certs supplied) to match the chemistry and mechanicals and process
variables with something that is permitted. Then you can use the
allowables for the permitted material. You have to prove that it looks
like a duck, walks like a duck, quacks like a duck and matches up with
a previously identified duck. Then you can assume that what you have
can substitute for a duck.
Christopher Wright P.E. |"They couldn't hit an elephant at
<a href="/group/PipingDesign/post?postID=iI3ylkXVbqmNU2IQmq28FY7P7oDQpgMjiKslpb7ZP1pjhmsPXfBYQbVbl1L2IXG9BUcl7AEMrieyw24">chrisw@skypoint.com</a> | this distance" (last words of Gen.
.......................................| John Sedgwick, Spotsylvania1864)
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