Relief loads for tube rupture cases

Relief loads for tube rupture cases are calculated based on the considerations described in this section. Two approaches are available for determining the size of a relief device, steady state and dynamic analysis. If a steady state method is used, the relief device size should be based on the gas and/or liquid flow rate passing through the rupture, as determined in Section 4.7.1. If the relief device must be located a significant distance from the exchanger, and the low pressure side is filled with liquid, the equivalent volumetric flow rate of the low pressure fluid based on the volume of high pressure fluid passing through the rupture should be considered as an additional relief case (short term) which will occur until flow of the high pressure fluid begins to relieve. Alternatively, a dynamic analysis, as described in Section 4.7.3 can be used to define relief requirements in more detail.