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Received: 5 August 2020 Accepted: 13 October 2020 This paper explains the SIS to investigate the system of instrumentation and process control on the steam purification systems in the geothermal power plant. The research objectives include (i) analysis based on SIL against the BPCS, (ii) determining the component specifications of SIS, (iii) the design of SIS in the form of drawing, and (iv) simulation aided the application of PLC Simulator against the design of SIS result. Analysis step based on SIL conducted on the existence of BPCS. There are two potential danger of SIL-2, namely the condensate water entered the turbine and the steam pressure drop. The component specification is a consideration for the installation of two actuators with a redundant system. The design of SIS in the form of drawing namely the investigating for the instrumentation and process control through the block diagram, so that the function of the SIS as a protection system against personal safety, environmental, and operating facilities, in addition to the publication of the company's reputation. The simulation against the design of development results namely the conditioning of the operation of the emergency valve for drain to the gain of certainty, that the valve is opened when signals from LSH or logic 1 is received and the valve is closed again after signal reception from LSL or logic 0, so the valve can be operated in accordance with logic operation 1 and 0.

Safety Instrumented Systems to Investigate the System of Instrumentation and Process Control on the Steam Purification System