Rupture discs and safety valves can be combined in two different configurations: The rupture disc can be installed below the safety valve or the two pressure relief systems installed prallel. If the systems are installed next to each other, the response pressure of the rupture disc is higher than that of the safety valve. If the rise in pressure is so large and rapid that the safety valve cannot respond sufficiently quickly or if it fails to open, the rupture disc serves as a reliable backup system to relieve the pressure. If the rupture disc is installed below the safety valve it can perform a number of roles.