January 2008

Instrumentation/Safety

Relief rate calculation for control valve failure

Use these equations to determine capacity requirements

Rahimi Mofrad, S., Petrofac Engineering & Constructions

In natural gas processing, petroleum refineries, and petrochemical and chemical plants, automatic control systems are normally used to achieve smooth and safe operation as well as maximize production and minimize hazards for equipment and personnel. But the malfunction of a control system due to design and operational faults or system failure may lead to equipment overpressure and consequently an unsafe condition. The process designer is responsible for determining the conditions under which the internal pressure of equipment increases in response to such an abnormal situation and providing an effective pressure protection system with appropriate capacity. Control valve failures Generall

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