Abstract

Abstract Through the use of a High Integrity Pressure Protection System (HIPPS) the flare capacity of a wellhead platform can be reduced to the flowrate required for depressurisation. The HIPPS may also be used to reduce the flare capacity of a process plant. By the use of HIPPS, the discharge of hydrocarbons or carbon dioxide due to venting/flaring is reduced. This paper describes the development of HIPPS for the Sleipner B-platform offshore Norway. A 20" multiphase pipeline is protected against overpressure by two 20" quick acting shut down valves (QSV) installed in series, instead of pressure safety valves. The valves have been qualified for operation in wellstream at a shut-in pressure of 336 bar, and have a closing time of 2 seconds. Each of the QSVs has independent, fail safe instrumentation cirquits. A parallel train of QSVs has been installed due to the testing requirements. The estimated saving using HIPPS on SLB was $ 25 mill. The paper also discuss existing and new applications of the HIPPS.

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