The application of Bayesian – Layer of Protection Analysis method for risk assessment of critical subsea gas compression systems

Article


Arewa, A., Ifelebuegu, A. O., Awotu-Ukiri, E. O., Theophilus, S. C. and Bassey, E. 2018. The application of Bayesian – Layer of Protection Analysis method for risk assessment of critical subsea gas compression systems. Process Safety and Environmental Protection. 113 (2), pp. 305-318. https://doi.org/10.1016/j.psep.2017.10.019
AuthorsArewa, A., Ifelebuegu, A. O., Awotu-Ukiri, E. O., Theophilus, S. C. and Bassey, E.
Abstract

Subsea gas compression system (SGCS) is a new critical subsea-to-shore field development solution that could reduce costs and environmental footprint. However, this system is not without inherent and operational risks. It is therefore, vital to evaluate the possible risks associated with SGCS to ensure the safe operation of the system. To this end, Layer of Protection Analysis (LOPA) is a suitable method for the estimation of possible risks. However, the failure rate data from SGCS required for LOPA is sparse and mostly developed from experimental testing. Bayesian (BL) logic is an effective tool that could be used to resolve this shortfall. In this paper, generic data from a secondary database was updated with SGCS specific data using BL logic to give a better risk frequency value. The key findings show that the posterior values derived from the BL-LOPA methodology are safer and more reliable to implement for an event scenario when compared to literature, expert judgement and generic data; therefore recommending an improved judgement in the application of safety instrumented systems for a required safety integrity level. The case studies used demonstrated that the BL-LOPA risk assessment method is sufficiently robust for quantifying uncertainties in new process facilities with sparse data.

JournalProcess Safety and Environmental Protection
Journal citation113 (2), pp. 305-318
ISSN0957-5820
Year2018
PublisherElsevier
Digital Object Identifier (DOI)https://doi.org/10.1016/j.psep.2017.10.019
Publication dates
Online08 Nov 2017
Publication process dates
Accepted31 Oct 2017
Deposited05 May 2021
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