Sizing method for top venting of gassy systems

The combination of these assumptions should usually be conservative, because no 

The peak gas evolution rate, QGmax, can be obtained from calorimetric measurements (see Annex 2 and equations (A2.3) and (A2.4)). It is important that such calorimetric tests are performed so as to minimise the amount of dissolved gas in the test. Open tests are therefore preferred to closed tests[2]. 

The required relief flow area, A, can be obtained from the required relief rate, W, given in equation (7.1) using equation (5.1)  

The two-phase mass flow capacity per unit cross-sectional area, G, can be calculated using any applicable method for non-flashing two-phase flow (see Chapter 9). In order to minimise the relief size obtained, G should be evaluated at the maximum accumulated pressure, irrespective of the relief pressure. 

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ALTERNATIVE RELIEF SYSTEM SIZING METHODS FOR TOP VENTING OF GASSY SYSTEMS... 

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