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An industrial safety system is a countermeasure crucial in any hazardous plants such as oil and gas plants and nuclear plants. They are used to protect human, plant, and environment in case the process goes beyond the control margins. As the name suggests, these systems are not intended for controlling the process itself but rather protection. Process control is performed by means of process control systems (PCS) and is interlocked by the safety systems so that immediate actions are taken should the process control systems fail. Process control and safety systems are usually merged under one system, called ''Integrated Control and Safety System'' (ICSS). Industrial safety systems typically use dedicated systems that are SIL 2 certified at minimum; whereas control systems can start with SIL 1. SIL applies to both hardware and software requirements such as cards, processors redundancy and voting functions. ==Types of industrial safety systems== There are three main types of industrial safety systems in process industry:〔Most of this article is summarized from some Yemen LNG documentation on safety systems, No. YE-001-30-POC-JBS-25300 and YE-001-30-POC-JBS-25200.〕 * Process Safety System or Process Shutdown System, (PSS). * Safety Shutdown System (SSS): This includes Emergency Shutdown-(ESD) and Emergency Depressurization-(EDP) Systems. * 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Industrial safety system」の詳細全文を読む スポンサード リンク
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