There is a newer edition of this document available. This Code is applicable to the following types of reclosing & non reclosing pressure relief devices, (A) Pressure relief valves (B) Rupture disk devices (part 1 only) (C) Breaking/shear pin devices (part 1 only), and (D) Fusible plug devices (part 1 only) Other pressure relief devices may be tested provided all parties to the test agree to accept the provisions of this Code. This Code provides instructions for flow capacity, in service, and bench testing under various inlet and outlet conditions using steam, gases, and liquids for which valid physical properties are known. It is assumed that the testing facility has adequate capacity and sufficient pressure to conduct the tests. PTC 25 - 1994 is a redesignation of PTC 25.3-1988 Safety and Relief Valves.