International Journal of Naval Architecture and Ocean Engineering

The Society of Naval Architects of Korea (대한조선학회)
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Use of hazardous event frequency to evaluate safety integrity level of subsea blowout preventer

  • Chung, Soyeon (Department of Naval Architecture and Ocean Engineering, Seoul National University) ;
  • Kim, Sunghee (Advanced Technology Institute, Hyundai Heavy Industries Co Ltd.) ;
  • Yang, Youngsoon (Department of Naval Architecture and Ocean Engineering & Research Institute of Marine Systems Engineering, Seoul National University)
  • Received : 2015.08.10
  • Accepted : 2016.02.11
  • Published : 2016.05.31
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Abstract

Generally, the Safety Integrity Level (SIL) of a subsea Blowout Preventer (BOP) is evaluated by determining the Probability of Failure on Demand (PFD), a low demand mode evaluation indicator. However, some SIL results are above the PFD's effective area despite the subsea BOP's demand rate being within the PFD's effective range. Determining a Hazardous Event Frequency (HEF) that can cover all demand rates could be useful when establishing the effective BOP SIL. This study focused on subsea BOP functions that follow guideline 070 of the Norwegian Oil and Gas. Events that control subsea well kicks are defined. The HEF of each BOP function is analyzed and compared with the PFD by investigating the frequency for each event and the demand rate for the components. In addition, risk control options related to PFD and HEF improvements are compared, and the effectiveness of HEF as a SIL verification for subsea BOP is assessed.

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