|Code Design Temperature & Design Pressure|
|Pressure Design Temperature||Design Pressure|
|B31.1||The piping shall be designed for a metal temperature representing the maximum sustained condition expected. The design temperature shall be assumed to be the same as the fluid temperature unless calculations or tests support the use of other data, in which case the design temperature shall not be less than the average of the fluid temperature and the outside wall temperature.||The internal design pressure shall be not less than the maximum sustained operating pressure (MSOP) with in the piping system including the effects of static head.|
|B31.3||The design temperature of each component in a piping system is the temperature at which, under the co-incident pressure, the greatest thickness or highest component rating is required in accordance with par. 301.2||The design pressure of each component in a piping system shall be not less than the pressure at the most severe condition of co-incident internal or external pressure and temperature expected during service, except as provided in par. 302.2.4|
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|B31.4||The design temperature is the metal temperature expected in normal operation. It is not necessary to vary the design stress for metal temperature between – 20F and 250F.||The piping component at any point in the piping system shall be designed for an internal design pressure which shall not be less than the maximum steady state operating pressure at that point, or less than the static head pressure at the point with the line in a static condition. The maximum steady state operating pressure shall be the sum of the static head pressure, pressure required to overcome friction losses and any required back pressure.|
|B31.8||No design temperature. The code mentions only ambient temperature and ground temperature. (1975)||Design pressure is the maximum operating pressure permitted by the Code, as determined by the design procedures applicable to the materials and locations involved.|
|Z662||For restrained piping, the temperature differential shall be the difference between the maximum flowing fluid temperature and the metal temperature at the time of restrained.
For unrestrained piping, the thermal expansion range to be used in the flexibility analysis shall be the difference between the maximum and minimum operating temperatures.
|The design pressure at any specific location shall be specified by the designer, shall not be less than the intended maximum operating pressure at any location, and shall include static head, pressure required to overcome friction loss and any required back pressure.|
Code Design Temperature & Design Pressure
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