In some cases the calculated volume

In some cases the calculated volume flow through the tube rupture exceeds the normal flow through the high pressure side of the exchanger. In those cases, an assessment should be made to determine whether that high flow can be sustained for a long enough time to be of concern. If there is a large volume of high pressure vapor available to flow to the exchanger from vessels upstream and downstream of the exchanger, then sustained flow at the high calculated rate should be considered. Where it is unclear if sustained flow should be considered, then the client should be advised and agree on the conclusion. Dynamic simulation can be used as a tool to provide some guidance for this circumstance.