January 2006

Instrumentation/Safety

Applying instrumented overpressure protection systems

Transient analysis is required to verify their effectiveness

Sutikno, T., Fluor Corp.

An instrumented overpressure protection system (IOPS) offers significant cost savings and does not discharge to the environment. Effective applications of this system depend on the dynamic fluid flow characteristics and response time of the shutdown valve in isolating the pressurizing source. Transient analysis is required to verify effectiveness of an IOPS and is discussed in this article with flowline examples. Use of an instrumented system for overpressure protection differs from use of conventional, spring-loaded relief valves. These valves typically discharge to atmosphere or to a flare system. For relief valves in hydrocarbon services, a flare system is typically required to combust t

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