5.2.3 Design pressure
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5.2.3 Design pressure

  5.2.3.1 The design pressure P in the formula for t o in 5.2.2.1 is the maximum gauge pressure to which the system may be subjected in service:

  5.2.3.2 The greater of the following design conditions should be used for piping, piping system and components as appropriate:

  • .1 for vapour piping systems or components which may be separated from their relief valves and which may contain some liquid: the saturated vapour pressure at 45°C, or higher or lower if agreed upon by the Administration (see 4.2.6.2);

  • .2 for systems or components which may be separated from their relief valves and which contain only vapour at all times: the superheated vapour pressure at 45°C or higher or lower if agreed upon by the Administration (see 4.2.6.2), assuming an initial condition of saturated vapour in the system at the system operating pressure and temperature; or

  • .3 the MARVS of the cargo tanks and cargo processing systems; or

  • .4 the pressure setting of the associated pump or compressor discharge relief valve; or

  • .5 the maximum total discharge or loading head of the cargo piping system; or

  • .6 the relief valve setting on a pipeline systems.

  5.2.3.3 The design pressure should not be less than 10 bar gauge except for open-ended lines where it should be not less than 5 bar gauge.

Parent topic: 5.2 Cargo and process piping
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