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Audit of site-specific anchoring assessments - Port Reval at Eldfisk

During the period 27 to 30 June 2005 we carried out an audit of ConocoPhillips Skandinavia AS. The audit was in connection with the planned anchoring of Port Reval at Eldfisk.

Background for the audit

Port Reval (source: OSM)ConocoPhillips plans to use Port Reval (Photo) as a flotel on the Eldfisk field from the autumn of 2005 to the summer of 2006. Port Reval is held in position by anchor chains.

Due to the events of recent years on the Norwegian Shelf, we have carried out a series of audits related to site-specific considerations that, pursuant to the regulatory framework, shall be carried out prior to anchoring mobile facilities.

Purpose of the audit

The object of the activity was to perform an audit with site-specific assessments being made in connection with Port Reval being used at Eldfisk.

The audit involved activities both at ConocoPhillips, OSM, Global Maritime, which carries out calculations, and at the manufacturer of the software that is used in the anchoring analyses.

Result of the audit

ConocoPhillips facilitated the audit well, and the general impression following the audit is positive. Nevertheless, observations were made as regards deviations and potential for improvement.

ConocoPhillips has not verified the analyses as required in the regulatory framework. This is a deviation.

The analysis work to be carried out in connection with positioning the Port Reval is comprehensive, and the analyses are often complex. In order for the analyses to provide the desired quality, it is important that the values of the parameters that are used are correct. In this context, the operator's verification activity is especially important.

Of the points that require improvement, we would particularly like to emphasize:

  • The buoys and appurtenant systems must have sufficient strength.
  • The planned test tension is not as high as the loads to be expected.
  • Inadequate interaction between the premises of the anchoring analyses and the operational conditions to be expected.

Contact person i the Petroleum Safety Authority
Mike Theiss