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Relief rate calculation for control valve failure

01.01.2008  |  Rahimi Mofrad, S.,  Petrofac Engineering & Constructions, Sharjah, UAE

Use these equations to determine capacity requirements


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.

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Martin Mastandrea

The 1.5 times design pressure rule should be applied only to remote contingencies. In my opinion, the failure of a single control valve (100% open) is not a remote contingency. Hence the 1.5 times design pressure rule SHOULD NOT be applied.

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