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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.
Summer conditions: optimum temperature of 24.5Â°C with an acceptable range of 23-26Â°C ; Winter conditions: optimum temperature of 22Â°C with an acceptable range of 20-23.5Â°C ; NOTE: CSA indicates both of these conditions are based on Table 3 from ASHRAE Standard 55, at 50% relative humidity and average air speed of . 0.15 m/s.