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Root causes of hydrocarbon leaks on offshore petroleum installations

Vinnem, Jan Erik; Røed, Willy
Journal article, Peer reviewed
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URI
http://hdl.handle.net/11250/2434949
Date
2015
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  • Institutt for marin teknikk [3315]
  • Publikasjoner fra CRIStin - NTNU [34929]
Original version
Journal of Loss Prevention in the Process Industries. 2015, 36 54-62.   10.1016/j.jlp.2015.05.014
Abstract
Hydrocarbon leaks on offshore installations may result in severe consequences to personnel, to the environment and to assets. In order to prevent such leaks, it is crucial to understand their root causes. The objective of this paper is to study the circumstances of hydrocarbon leaks on the Norwegian continental shelf (NCS). In the study, all reported hydrocarbon leaks from process inventories on all offshore installations on the NCS, with an initial leak rate higher than 0.1 kg/s in the period 2008–2014, have been considered. This includes 78 hydrocarbon leaks, of which about 60% have occurred during manual intervention on normally pressurized systems. The dominating activity when leaks occur is preventive maintenance. A significant fraction of the leaks occur during the preparation for maintenance; such a preparation is typically carried out during the night shift. About half of the leaks are associated with wellhead area and manifolds, separation and compression systems. A substantial fraction of the leaks can be associated with verification faults, dominated by the failure to comply with procedural requirements that are needed to carry out independent verification.
Publisher
Elsevier
Journal
Journal of Loss Prevention in the Process Industries

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