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answered Sep 2, 2016 by sabdullayev (5,290 points)
For sizing a KO Drum or any pressure vessel for that matter, please follow ASME Section VIII Division I, II, III depending on the design conditions.

API-521 will give you guidelines, recommendation for sizing pressurized equipment. In another word, API-521 gives guidelines for equipment that see over pressure or relieving pressure that may caused by the process.