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This document specifies the requirements for the design, manufacture and testing for bursting disc pressure relief devices for use with gas cylinders. It is a requirement of this document that the bursting disc pressure relief devices conform to EN ISO 4126-2. In the event of a conflict, the requirements of this document take precedence over that standard. This document does not apply to acetylene gas cylinders and is restricted to bursting disc pressure relief devices for gas cylinders used in some specific applications. NOTE This document does not provide methods for determining the capacity of a bursting disc pressure relief device for a particular gas cylinder. This document will not indicate when a bursting disc pressure relief device shall be fitted and at which pressure it will be set, see EN 13096.