Fusible Plugs supply,
Fusible plug loops are installed in the at potentially
hazardous locations in a process area. The field devices are either connected
directly into the FGCPs or into field- mounted input/output stations (called
remote I/Os).
Each loop also includes a manual pressure release valve. Loss of air
pressure within a loop either by plug fusion or manual release initiates
audible and visual (red flashing beacon) alarms in the area and initiates an
ESD-2 shutdown from the DCS which alarms in the LCR and CCR.