Different Ambient Conditions Affect Pressure Vessel Design?

Pressure vessels are designed for a specific purpose that is primarily determined by their intended use. However, climatic conditions have to be taken into account because of their potential impact on the integrity of these vessels. Some environmental factors that impact on pressure vessel requirements include:

  • Low temperature: The resistance of steel to brittle fracture is reduced at low temperatures. According to ASME VIII, the minimum design metal temperature (MDMT) and the lowest anticipated temperature the vessel will be exposed to must be taken into account and certain procedures followed during manufacture of low temperature pressure vessels. Section UCS-65 of ASME VIII lists the design and manufacturing requirements of pressure vessels for low temperature operation.
  • Moisture: Pressure vessels exposed to the weather and high humidity can suffer rapid external corrosion if moisture is trapped, especially under lagging, and steps must be taken to prevent such corrosion.
  • Marine environment: Pressure vessels in coastal environments are vulnerable to corrosion from salt spray and must have corrosion-resistant coatings.