Tis dument ss out uidance for the nstallation and operation of isolating devices (typically valves which allow the removal of relief devices from operating plant. It draws on the experience and different practices of EEMUA members to identify the key points which should be considered in the design and management of such isolation systems. The term ??isolation valve/device?? may be interpreted to include spectacle or slip plates where these are used instead of valves for the isolation of relief devices. The term ??relief eliving device?? normally refers to a safety elief valve@ bursting disc or other mechanical relieving device. Important: None of the comments or recommendations made in this guide removes from the designer and /or user the responsibility of ensuring that the relief device installation is safe and that it complies with the applicable national and industry standards and regulatory requirements.