Abstract
To reduce costs and to extend the lifetime of piping systems their design loads due to valve action have to be optimised. To get the best effect the results of the fluiddynamic and structural calculations should be realistic as far as possible. Therefore the calculation programs were coupled to consider the fluid structure interaction and the effect of dynamic fluid friction was introduced to get realistic results of oscillations due to pressure surges. Detailed modelling of check valve behaviour allows to minimise the pressure surge loading by improving the valve function and adapting it to the system behaviour. The method was validated at measurements of load cases in power plant piping systems. Results with different load cases show the effectiveness of reducing the fluid forces on piping. Examples are given to prove the reduction of supports.
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