ASME STP-PT-024 PDF

Description

Provides recommendations for design rules for very short term loads where creep should and shouldn’t be a design consideration.
View additional information rules section viii, division 1 provide allowable stress design pressure vessels independent load duration.  time dependent regime failure creep rupture consideration, actual life vessel depends number things, including margins provided stresses, margin operating temperature temperature.  material properties duration 100,000 hours included part basis establishing stress, not anticipated vessel. short term conditions based set long unrealistically conservative.  obvious example earthquake loading, duration, relevant mode.  another example, albeit subjective, loading due extreme wind, wind velocities typically used design.  respect overload failure, yield tensile properties, properties.  considering, ratio strength type 304h stainless steel 1200°f 1400°f 2.3 5.0 (yield values per iii, subsection nh [5]), respectively, provides indication conservatism using design. addition, processes operate various conditions.  longer operation lower temperatures combined regeneration higher temperatures.  explicitly consider condition designed code operation. finally, may desired user specific life, rather accept indeterminate results combinations mentioned above.  consideration stresses can e.g., 300,000 hours. report recommendations loads termed occasional herein, considering creep. shouldn’t consideration.