Transcription of HIGH PERFORMANCE COPPER PRODUCTS
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HIGH PERFORMANCE COPPER PRODUCTS
Mueller Industries has tested andvalidated its Streamline COPPER tube and COPPER fittings for an operating pressure of 700 PSI. The following information willgive an insight on the testing and qualifications of Streamline PERFORMANCE COPPER PRODUCTS The problem with using a proportional limit todesignate an allowable stress for COPPER isthat COPPER , unlike steel, does not have aproportional limit. Therefore any attempt togenerate an allowable stress using some % offset is misleading and inaccurate. The problem with assuming wall thickness isdirectly proportional to the operating and burstpressure of a COPPER tube or fitting is that it totallyignores the grain size and grain cleanliness ofthe cast and hard drawn tube. In fact, the graincondition can have a greater impact on materialstrength than the wall thickness. Another problem with using an ill-defined allowablestress and a wall thickness as the strengthdrivers is that they do not account for the robustquality of strain hardening that COPPER possesses(as stress goes up COPPER strain hardens allowingfor greater stress to be applied).
• The problem with using a proportional limit to designate an allowable stress for copper is that copper, unlike steel, does not have a proportional limit.
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