A refinery wanted to ensure that pressure relief capacity was adequate for the loss of liquid seal scenario in a high-pressure separator (2,000 psig). Also, they were concerned about the pressure waves that would occur in the high-pressure separator’s outlet lines on rapid closing of the isolation valves.
Using our SuperChems Expert™ software, we were able to model the system between the high-pressure separator and the down stream vessel. The system consisted of three parallel flow paths. In one path there was a power recovery turbine that was modeled. The other two flow paths contained control valves. The fluid flowing in the piping was a mixture containing twelve compounds, which were also included in the modeling.
Using the SuperChems™ simulations we were able to show that the relief valves and piping were adequate for the flow of gas that would be encountered on loss of liquid seal and that the downstream vessel would not be subject to a pressure greater than its MAWP. Lastly, an optimum valve closing time was determined that would not result in pressure waves that could cause failure of the upstream piping.
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