DS EN 13648-1:2009
DS EN 13648-1:2009 Cryogenic Vessels - Safety Devices For Protection Against Excessive Pressure - Part 1: Safety Valves For Cryogenic Service Defines the requirements for the design, manufacture and testing of safety valves for cryogenic service, that is to say for operation with cryogenic fluids (as defined in EN 1251-1) below -10 degrees