Worked example, using Wildays step-wise method

Worked example using Wilday s step-wise method 

Use of the method will be illustrated using the example problem for a vapour pressure system which was described in 6.5. For this example, the relief pressure is 2.0 bara and the maximum accumulated pressure is 2.6 bara. The step-wise method will be demonstrated by using two steps  

The reactor volume is 2.0 m3 and the charge is 793 kg. The reacting system has been shown not to be inherently foamy (see Annex 2). Total vapour/ liquid disengagement is expected at a void fraction of 0.9. Data which vary with pressure, obtained from physical property correlations, are tabulated below  

This has been taken from 6,5, and corrected for the discharge coefficient of the valve. 

Guess an area, A, of 0.03 m2. (This has been chosen to be lower than was obtained using Leung s method in 6.5). 

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