| Abstract |
With the advent of the state-of -the -art fieldbus technology based instrumentation and distributed control systems (DCS), the NNGP Fluid Collection and Recycling Systems (FCRS) will be PNOC-EDC's first geothermal production field that will be operated and monitored utilizing the globally adopted Foundation Fieldbus digital instrumentation and control systems. The Foundation Fieldbus fully digital instrumentation and control systems primarily provide the NNGP FCRS with a centralized computer-based process controls and monitoring. The intelligent field devices that provide real-time superb diagnostics of its health but also provide diagnostics of process disturbances on its inputs like impulse line clogging. To ensure continuous monitoring and process control of the FCRS, the distributed control systems are implemented in fully redundant architectures to provide high-availability process control systems. The redundant architectures implemented ranges from redundant operator workstations, process controller processors, controller power supplies, fieldbus H1 communication interface modules, fieldbus network power supplies to redundant fieldbus devices. To protect the fieldbus networks from the damaging effect of voltage surges caused by lightning strikes and switching-on of motor loads, all fieldbus segments are provided with surge protection devices. To eliminate single point of failure of any fieldbus network due to short-circuit of spur or trunk cable, all fieldbus devices are terminated in junction boxes through fieldbus megablocks that have built-in short circuit protection. |