API Style Calculator
API is for above-ground storage and process tanks. It has definitive codes, cals, and requirements. It’s low pressure, ground-supported storage tanks, and field-erected.
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ASME Style Calculator
Pressure vessels are designed for tanks over 15PSI, and they have to be in accordance with ASME code standards. They have to be certified and registered with the states, and you have to have a 3rd party inspector to verify everything.
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