For exchangers that include both a

For exchangers that include both a vapor space and a potential liquid pool on the high pressure side (e.g., HP steam and condensate) the designer should consider the worst case scenario that has a meaningful short-term sustainability. For example, in the case of HP steam and condensate, the minimal hold-up of high pressure condensate from a steam trapped exchanger during normal operations should quickly dissipate after the tube break with minimal to no backflow from the lower pressure condensate header and, therefore, usually does not need to be considered for the rare case of tube rupture.