BS EN ISO 4126-2:2003 pdf free.Safety devices for protection against excessive pressure – Part2: Bursting disc safety devices.
A bursting disc safety device is a non-reclosing pressure relief device used to protect pressure equipment such as pressure vessels, piping, gas cylinders or other enclosures from excessive pressure and/or excessive vacuum.
A bursting disc safety device typically comprises an assembly of components including a bursting disc, a bursting disc holder and, where necessary, other components such as back pressure supports, stiffening rings etc.
The bursting disc is a pressure-containing and pressure-sensitive part of the bursting disc safety device and is designed to open by bursting at a pre-determineci pressure. There are many different types of bursting disc safety devices manufactured in corrosion resistant materials, both metallic and non-metallic, to cover a wide range of nominal sizes, burst pressures and temperatures.
This part of this European Standard specifies the requirements for bursting disc safety devices.
It includes the requirements for the design, manufacture, inspection, testing, certification, marking, and packaging.
The requirements for the application, selection and installation of bursting disc safety devices are given in Part 6 of this European Standard.
4 Materials
4.1 Selection of materials
The selection of materials used for the components of bursting disc safety devices shall take into account:
a) suitability with regard to manufacture;
b) compatibility with the process fluid, the adjoining components and the chemical and physical conditions to which the bursting disc safety device will be subjected when in service.
NOTE The use of corrosion-resistant materials for the downstream side of the bursting disc device is recommended because corrosion of these parts can cause damage which can impair the performance of the bursting disc safety device.
4.2 Material specifications
The material specification for the bursting disc safety devices shall be according to annex A (normative) and annex B (informative).
They shall have uniform chemical and physical properties and shall be free from defects, which would cause the bursting disc safety device to malfunction.
4.3 Protection from corrosion
Bursting disc safety devices are frequently required to operate in corrosive environments and, therefore, components manufactured from materials affected by corrosion shall, where appropriate, be protected by coating, plating or lining.
Coatings and plating shall be applied to give an even and homogeneous coating to the surfaces to be protected. Linings shall be seamless and supplied with the bursting disc safety device so as to preserve them as a set or integral unit.
The corrosion protection shall be supplied only by the manufacturer.
The corrosion protection shall not impair the performance of the bursting disc safety device.