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In functional safety a safety instrumented system (SIS) is an engineered set of hardware and software controls which provides a protection layer that shuts down a chemical, nuclear, electrical, or mechanical system, or part of it, if a hazardous condition is detected.
Although functionally separate, process control and shutdown systems are usually interfaced under one system, called an integrated control and safety system (ICSS). Shutdown systems typically use equipment that is SIL 2 certified as a minimum, whereas control systems can start with SIL 1. SIL applies to both hardware and software requirements ...
An occupational safety management system (OSMS) is a management system designed to manage occupational safety and health risks in the workplace.If the system contains elements of management of longer-term health impacts and occupational disease, it may be referred to as a occupational safety and health management system (OSHMS) or occupational health and safety management system (OHSMS).
A high-integrity pressure protection system (HIPPS) is a type of safety instrumented system (SIS) designed to prevent over-pressurization of a plant, such as a chemical plant or oil refinery. The HIPPS will shut off the source of the high pressure before the design pressure of the system is exceeded, thus preventing loss of containment through ...
Examples [1] of safety-critical systems. From left to right, top to bottom: the glass cockpit of a C-141 , a pacemaker , the Space Shuttle and the control room of a nuclear power plant . A safety-critical system [ 2 ] or life-critical system is a system whose failure or malfunction may result in one (or more) of the following outcomes: [ 3 ] [ 4 ]
Functional safety is becoming the normal focused approach on complex software intensive systems and highly integrated systems with safety consequences. The traditional software safety tasks and model based functional safety tasks are performed to provide objective safety evidence that the system functionality and safety features perform as ...
Integrated safe system of work (ISSOW) is used in hazardous industry to request, review, approve and document tasks to be carried out by frontline workers. [1] It integrates permit-to-work , risk assessment and isolation management under a single electronic system, providing safety improvements to the user.
IEC 61511 provides good engineering practices for the application of safety instrumented systems in the process sector. In the United States ANSI/ISA 84.00.01-2004 was issued in September 2004. It primarily mirrors IEC 61511 in content with the exception that it contains a grandfathering clause:
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