1 Scope 1.1 This Part specifies the technical requirements for design, manufacture, inspection, test, marking sign, packing and ex-factory documents of bursting disc safety devices. 1.2 This Part is applicable to the following bursting disc safety devices: — The bursting disc safety devices used for pressure vessels, pressure pipes or other sealing pressure equipments (hereafter referred to as “pressure equipments”) to prevent the overpressure or excess vacuum; — The bursting pressure of bursting discs is not greater than 500MPa and not less than 0.001MPa. 1.3 This Part is not applicable to the following bursting disc safety devices: — Pressure equipment, possible to increase pressure abruptly in the operation, reaching reaction rate at detonation degree. — Bursting disc safety devices under the special requirements in the defence military equipment. Note: detonation: phenomena generated very differently from the common burning and explosion when the burning rate of the material is as quick as above 1 000m/s. 2 Normative References The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB 567.2 Bursting disc safety devices — Part 2: Application, selection and installation GB 567.3 Bursting disc safety devices — Part 3: Classification and mounting dimensions GB 567.4 Bursting disc safety device — Part 4: type test 3 Terms and Definitions For the purposes of this document, the following terms and definitions apply. 3.1 Pressure Unless otherwise stated, pressure all refers to the gauge pressure. 3.2 Bursting disc safety device It refers to the pressure relief safety device that is composed of such assemblies as bursting disc (or bursting disc assembly) and bursting disc holder (or supporting ring). The bursting disc will act (crack or fall off) and discharge the pressure medium immediately when the pressure difference between both sides of the bursting disc reaches the preset value at the preset temperature. 3.3 Bursting disc It refers to the pressure sensitive device that is in the bursting disc device and is able to act rapidly due to overpressure. 3.4 Bursting disc assembly It refers to the assembly combined by two or more such parts as bursting disc, back pressure support, stiffening ring and anticorrosion lining, which is also called assemble-type bursting disc. 3.5 Conventional domed bursting disc (also referred to as: forward-acting) The pressure sensitive device acts like a conventional domed shape. The concave surface of the dome will locate at the high pressure side of the pressure system after installation. The tensile failure will occur on this device when it actuates. 3.6 Reverse domed bursting disc (also referred to as: reverse-acting) It refers to the pressure sensitive device that is in reverse domed shape. The convex side of the dome will be located at the high pressure side of the pressure system after installation. When actuating, the compression, unstability and overturning will occur on this device to cause cracking or falling off. 3.7 Flat bursting disc The pressure sensitive device acts like a flat shape during installation. 3.8 Graphite bursting disc The pressure sensitive device is made from graphite and will crack due to bending or shearing when actuating. 3.9 Bursting disc holder It refers to the independent clamping component, in the bursting disc safety device, which has a specified discharge caliber and is used to fix the bursting disc and support the loads on it as well as ensure the sealing and leak-free property of this device and the exact actuation of the bursting disc.
