This discussion focuses on the thermal expansion of piping systems, specifically referencing ASME B31.3 "Process Piping Code," which outlines requirements for piping flexibility analysis. Participants emphasize the importance of understanding the coefficient of thermal expansion/contraction, noting that while diameter expansion is less critical, the bending loads due to length expansion are significant. The consensus is that metals can be modeled as isotropic materials, allowing the same linear coefficient to apply to both length and diameter changes in pipes.
PREREQUISITESEngineers, piping designers, and stress analysts involved in the design and analysis of piping systems, particularly those concerned with thermal expansion and compliance with industry standards.
Most piping systems in the US must conform to ASME B31.3 "Process Piping Code". Para. 319 covers concepts, requirements and equations to be used for piping flexibility analysis, especially those stresses and deflections due to thermal expansion/contraction.Can anyone offer a literature reference regarding thermal expansion of piping systems?
Can you be more specific? Are you referring to the coefficient of thermal expansion/contraction?I am interested in reading up on how the use of a linear coefficient compares with using an area coefficient when accounting for diameter expansion.
Metals can be modeled as isotropic materials, so yes, the coefficient of thermal expansion/contraction will be the same for both length and diameter of a pipe.I was trying to figure out if the same linear coefficient for expansion/contraction can be used to estimate a diameter change as well as a length change (which I have seen done in the past).
Right, and of course how the piping system will react also depends on how it is supported - for example: where the pipe is anchored (fixed point) or allowed to slide or otherwise supported.... the real concern is with the bending loads due to length expansion.