spayette
Mechanical
- Nov 5, 2003
- 50
An existing carbon steel vessel, which was not impact tested, is being evaluated for suitability. Desired MDMT is -150 F. When operation will occur at this temperature general membrane stresses are such that the ratio as shown in Figure UCS-66.1 is less than 0.35.
Local stresses at nozzles and saddles will be evaluated using FEA and following Division 2 rules, but using the Sm value from Division 1.
Question: For Primary and Primary plus Secondary Stresses is it appropriate in this case to use 1.5 times Sm and 3 times the average of Sm (cold) and Sm (hot) as prescribed by the Code for the allowable local stresses?
Local stresses at nozzles and saddles will be evaluated using FEA and following Division 2 rules, but using the Sm value from Division 1.
Question: For Primary and Primary plus Secondary Stresses is it appropriate in this case to use 1.5 times Sm and 3 times the average of Sm (cold) and Sm (hot) as prescribed by the Code for the allowable local stresses?
