MAWP for practical purposes is synonymous with Design Pressure. But many a times MAWP>Design Pressure, especially when you use stronger or thicker than required material for fabricating the pressure vessel.
MDMT is the lowest design temperature that the metal can be exposed to and not rupture under pressure (MDMT is important in cryogenic applications and in very cold places)
As per API 510, MAWP is defined as "The maximum gauge pressure permitted at the top of a pressure vessel in its operating position for a designated temperature. This pressure is based on calculations using the minimum (or average pitted) thickness for all critical vessel elements, (exclusive of thickness designated for corrosion) and adjusted for applicable static head pressure and non-pressure loads, e.g. wind, earthquake, etc.".
What is the designated temperature?
How does MWAP differ from Design Pressure?
Similarly, MDMT has been defined in API 510 as "The lowest temperature at which a significant load can be applied to a pressure vessel as defined in the applicable construction code (e.g. ASME Code, Section VIII: Division I, Paragraph UG-20(b))."
What is the difference between MDMT and Design Temperature?
Regards
Chandulal S Vithlani
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