September 2005

Piping

Changes in process piping code ASME B31.3 for 2004

The revisions and how they impact piping system design are highlighted

Kannappan, S., ABI Enterprises, Inc.

The piping code committee of the American Society of Mechanical Engineers (ASME) revises the piping codes as necessary. Significant technical changes were made in the 2004 edition of process piping code ASME B31.3. The changes are highlighted here. Readers are urged to read the code further on each change and apply as appropriate in the design. Equation and paragraph numbers in this article refer to the code. Changes in the following topics are presented: Weld joint strength reduction factors, W Stress range factor, f Alternate allowable stresses for occasional loads at elevated temperatures Alternative rules for flexibility analysis

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