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Comment PDF Automation & Control

Managing SIS Process Measurement Risk and Cost

By Nathan Hedrick and Craig McIntyre |

With a focus on flowmeters, this article shows how advances in measurement technologies help safety system designers reduce risk and cost in their safety instrumented systems (SIS) design and lifecycle management Successful implementation and management of a safety instrumented system (SIS) requires designers and operators to address a range of risks. First among these involves the specification of a proven measurement instrument, such as a flowmeter (Figure 1), and its proper installation for a given application, an undertaking that is fundamental to achieving the initial targeted risk reduction. FIGURE 1. Flowmeters like the one shown here can play key roles in reducing risks with safety instrumented systems (SIS)[/caption] Second is the definition of the support required to keep the flowmeter (or other measurement subsystem) available at that targeted level of risk reduction throughout the life of the SIS equipment. The support for the flowmeter must be defined in the design and implementation phase. Third involves following the recommendations found in the standard IEC 61511/ISA 84 (International Electrotechnical Commission; Geneva, Switzerland; www.iec.ch and International Society for Automation; Research Triangle Park, N.C.;…
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