DNV GL

About: DNV GL is a company organization based out in Sandvika, Norway. It is known for research contribution in the topics: Corrosion & Finite element method. The organization has 1929 authors who have published 2387 publications receiving 34644 citations.

Uncertainties of wind sea and swell prediction from the Torsethaugen spectrum

Abstract: In practical applications, it is usually assumed that the wave spectrum is of a single mode form, and well modelled by a JONSWAP or Pierson-Moskowitz spectrum. This assumption is of a reasonable accuracy for severe sea states. However, moderated and low sea states are often of a combined nature, consisting of both wind-sea and swell and should be characterized by a double peak spectrum. Bimodal seas can have a significant impact on the design and operability of fixed and floating offshore structures as well as LNG terminals. Although several separation procedures for the wave components exist the bimodal Torsethaugen spectrum is probably the only one well established in design work. This spectrum was developed primarily for one location at the Norwegian Continental Shelf (Statfjord Field) but in qualitative terms is expected to be of much broader validity. The present study discusses applicability of the Torsethaugen spectrum for locations outside the Norwegian Continental Shelf and uncertainties related to use of the spectrum.Copyright © 2009 by ASME

A method for barrier-based incident investigation

Abstract: Incident investigation is a formal requirement for high hazard facilities with the aim to learn from each incident and to prevent future recurrences. There are many published investigation methods, with most driving to the management system root cause and some applying newer barrier-based methods. However, these methods either do not link tightly to the facility risk assessment or are very difficult to apply, and lessons from incidents that might reveal weaknesses, especially relating to major accidents, can be missed. This article describes a novel method for incident investigation (Barrier-based Systematic Cause Analysis Technique) that combines the ideas of barrier-based risk assessment with a well-established systems-based root cause analysis method (Systematic Cause Analysis Technique). The method described is efficient and can be applied by properly trained supervisors, and this potentially allows every incident or near-miss event to be assessed in a consistent risk-based format. The method clearly establishes links back to the facility risk assessment and thus identifies risk pathways that are potentially too optimistic (i.e., the risk is higher than predicted), and this can be due to initial optimism or degradation of safety barriers (human or hardware). © 2015 American Institute of Chemical Engineers Process Saf Prog 34: 328–334, 2015