The configuration of the discharge

The configuration of the discharge piping and the contents (liquid or vapor) of the low-pressure side of the exchanger should be considered in determining the influence of piping in either eliminating the need for a relief device or in reducing relieving requirements. Where the low-pressure side is operated in the vapor phase, full credit can be taken for the vapor-handling capacity of the outlet and inlet lines, provided that the inlet lines do not contain check valves or other equipment that could prevent backflow. Where the low pressure side is liquid full, the effective relieving capacity for which the piping system may be credited shall be based on the volumetric flow rate of the low pressure side liquid that existed prior to the tube rupture, unless a dynamic analysis is used. In all cases, control valves and other restrictions in the inlet or outlet