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DIN EN 764-7:2002
Pressure equipment - Part 7: Safety systems for unfired pressure equipment
This part of this European standard describes the normative requirements of ultimate safety systems to protect a vessel, a system of vessels, piping accessories or assemblies from excessive operating conditions. Equipment connected together in a system by piping of adequate capacity, free from potential blockages and which does not contain any valve that can isolate any part may be considered as a system for the application of pressure relief.
Deutsches Institut für Normung [din]