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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.
Choice of trim for heated abrasive service. Metal seated ball valves are guaranteed for a maximum. service temperature of 572ËF (Trim symbol 5H) and 932ËF. (Trim symbol 6H). For hard graphite seated ball valves, a. maximum service temperature of 932ËF is also guaranteed. (Trim symbol 3H).