Relief system sizing data for vapour pressure systems

4 RELIEF SYSTEM SIZING DATA FOR VAPOUR PRESSURE SYSTEMS A2.4.1 General 

The following data need to be measured for vapour pressure evief MV e- 

Data on a number of physical properties are also required. This includes vapour and liquid densities, latent heat of vaporisation and liquid specific heat capacity. These can usually be obtained frorrihiterature sources. Their measurement is beyond the scope of this Workbook. 

If relief sizing is for a continuous or semi-batch reactor, then it may be appropriate to use isothermal calorimetry to determine the amount of reactant accumulation under worst case conditions. The mass of the accumulation, rather than the all-in 1 batch mass, can then be used for relief system sizing and this can reduce the required relief system size. It should sbe noted that it will still be necessary to carry out suitable adiabatic tests, as described below. Further information is given by Singh1101. 

DATA OBTAINED FROM A CLOSED TEST FOR A VAPOUR PRESSURE SYSTEM (IDEALISED) 

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