This is a Process Safety Management (PSM) issue with hydrogen gas lines. I've been tasked to look at fatigue of a long gas line. I know the designers took fatigue into account in their initial design, but I have no documentation which is ultimately needed.
I plan on applying a smooth bar...
I have a question regarding the thickness used in MDMT calculations for layered vessels. The minimum design metal temperature is related to wall thickness in the ASME temperature exemption curves. For layered vessels, do you sum the thicknesses or use the thickest layer (usually inside shell)...
Outdoor tank with an ambient commodity. Am I forced to API650 lowest one-day mean temperature chart plus 15 degrees? I don't have metal temperatures per say but I could get site temperatures over the last 5-10 years? If I do get a value for the lowest temp over that span, do I add 15 degrees...
We have a spherical storage tank made from A-212 B firebox material (1965) and are in the process of re-rating the MAWP (currently 3500psi) based on the MDMT/MAT. The vessel is 2 inches thick, and is used for a number of commodities (this recertification commodity is GN) as an outdoor storage...
