API 620 Temperature Limits
API 620 Temperature Limits
(OP)
Why does API 620 only go to 250 deg F? For a low pressure tank (5 psig) designed to 320 deg F, API 620 still seems like the best fit (this doesn't fall perfectly into any code). Since the allowable stress for 320 deg F is not significantly lower than that for 250 deg F can the API 620 equations be used for tank design? Do I need to use API 620 with API 650 appendix M?





RE: API 620 Temperature Limits
RE: API 620 Temperature Limits
Why does API 620 limit itself to 250°F?
RE: API 620 Temperature Limits
It is not uncommon to have situations where an item doesn't fall completely under any one standard. If you don't have a customer requirement or building code requirement to comply with a particular standard, it would be at the designer's discretion as to how to handle the situation. Common examples are welded steel silos and bins, which are built to tank standards "to the extent applicable."
RE: API 620 Temperature Limits
RE: API 620 Temperature Limits
RE: API 620 Temperature Limits
"At what temperature does the designer no longer want to select a flat bottomed tank design ?"
Flat bottomed metallic tanks simply cannot expand in a uniform, predictable manner as compared to ther designs
API has, by fiat, determined that 250F is the maximum.
Aside from random management or contract insanity, there is nothing to prevent the tank designer from going to an ASME VIII Horizontal tank design......on two saddles.
Another alternative might be a more detailed engineering FEA approach to the design
Perhaps there is something in an early Jawad and Farr text...
RE: API 620 Temperature Limits
RE: API 620 Temperature Limits
RE: API 620 Temperature Limits
Are you speaking from inside knowledge or just guessing.