Design Temperature

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 Design Temperature:

  • Design temperature is the temperature at which the allowable stresses for all pressure-retaining parts of the piping system are assigned.
  • The design temperature must be equal to or greater than the maximum sustained temperature that the pressure-retaining components will experience during all normal and expected abnormal modes of operation.
  • The design temperature of the system's pressure-retaining metal parts is normally assumed equal to the maximum free-stream fluid temperature.
  • While the pressure-integrity design is based upon the design temperature, most other thermally related aspects of the design are based upon the normal operating temperature.
  • The normal operating temperature is the temperature achieved by the system fluid while the system is operating in full load, steady load, non transient conditions.
  • It is lower than the design temperature.
  • The normal operating temperature is used as the basis for all thermal design analyses that relate to the structural integrity of the piping system, including the thermal flexibility analysis, the spring hanger sizing and setting calculations, and the thermally induced anchor movements calculations.
  • For uninsulated pipes, the metal temperature is taken fluid temperature, if temperature is below 65°C or 150°F.
  • Design Temperature = Operating Temperature + 50°F

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