Bursting discs with long relief lines of changing diameter

3 Bursting discs with long relief lines of changing diameter 

The Omega method is intended for constant diameter relief lines. However, it is possible to use the Omega method in an iterative calculation procedure if the use of a hand calculation method is preferred. A suggested procedure for using the 

Omega method to find the capacity of a bursting disc line with two sections having different pipe diameters is given in A8.4.5, 

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