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Minimum design metal temperature Save The minimum design metal temperature (MDMT) is one of the design conditions for pressure vessels engineering calculations, design and manufacturing according to the ASME Boilers and Pressure Vessels Code. Each pressure vessel that conforms to the ASME code has its own MDMT, and this temperature is stamped on the vessel nameplate.
1 Note that the range of maximum service temperature does not mean the range of temperature in which the material must be used! 2  It may be assumed that any operating temperature below the maximum service temperature down to zero degrees Centigrade is safe in design. For prolonged loading the maximum stress will be lower because creep (permanent stretching over time) will occur. 2  The data for a material on the selection chart shows the range in which the maximum service temperature fall (since a given material on the chart will include many different variants with the same name).