Category Archives for Mechanical and Structural

Autorefrigeration

The autorefrigeration temperature is defined as the temperature that the contents of a vessel would reach if the vessel is depressured to 40% of the MAWP (35% of MAWP for vessels built in 1999 and later). However, the autorefrigeration temperature … Continue reading

14. April 2018 by Jack
Categories: Mechanical and Structural | Leave a comment

Restricted Startup and Shutdown

Most pressure vessels in locations with a mild winter climate will not require special materials selection or CV-impact testing to assure adequate resistance to brittle fracture at their operating pressure during startup and shutdown. The minimum design metal temperature for … Continue reading

14. April 2018 by Jack
Categories: Mechanical and Structural | Leave a comment

Startup and Shutdown at Ambient Temperature

Pressure vessels that are installed at geographic locations with severe winter climates may be required to be at maximum operating pressure at low ambient temperatures during transient startup and/or shutdown conditions. The minimum design metal temperature for this situation should … Continue reading

14. April 2018 by Jack
Categories: Mechanical and Structural | Leave a comment

Operation Below Ambient Temperature

Pressure vessels that will be in continuous operation at temperatures below normal ambient temperatures are considered to be in “critical” service because of the risk of brittle fracture. The minimum design metal temperatures for these vessels are based on their … Continue reading

14. April 2018 by Jack
Categories: Mechanical and Structural | Leave a comment

Minimum Design Metal Temperature

The minimum design metal temperature (MDMT) is defined in Division 1 as “the lowest (temperature) expected in service.” This temperature is essentially the same as the minimum pressurizing temperature (MPT) in Company terminology. For most vessels, the minimum design metal … Continue reading

14. April 2018 by Jack
Categories: Mechanical and Structural | Leave a comment

Establishing the Maximum Design Temperature

The maximum design temperature is based on the normal maximum operating temperature obtained from the process design. The recommended practice is to add a margin of at least 25°F above the maximum operating temperature, to assure safe operation in the … Continue reading

14. April 2018 by Jack
Categories: Mechanical and Structural | Leave a comment

ASME Code, Section VIII, Division 1, Design Temperatures

Many pressure vessels are designed to operate at high temperatures, but are usually required to be under pressure at ambient temperature during startup and/or shutdown conditions. A few vessels are required to operate at temperatures below ambient temperatures, and others … Continue reading

14. April 2018 by Jack
Categories: Mechanical and Structural | Leave a comment

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