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Audit of Port Reval mooring

During the period from 5-7 September 2007, the Petroleum Safety Authority Norway (PSA) conducted an audit of ConocoPhillips and OSM Offshore (OSM). The audit was aimed at the mooring of Port Reval at Eldfisk Ester (2/7-E). Our impression subsequent to the audit is that ConocoPhillips and OSM Offshore have carried out thorough preliminary work in connection with the mooring of Port Reval at Eldfisk.


Port Reval (kilde: OSM)The audit was linked to the consent to use Port Reval (pictured) as a flotel at Eldfisk Ester, and the (AoC) to OSM for Port Reval.

The audit targeted the location-specific evaluations made in connection with the mooring of Port Reval at Eldfisk 2/7-E, and the equipment to be used in connection with the mooring.

The audit also encompassed a system verification at the supplier of the mooring system components for this specific system, Viking Moorings.

Background for the audit
The audit activity is associated with the PSA's overall objective of conducting audits of how the players manage factors that reduce the risk of major accidents. The planned use of the Port Reval as a flotel for Eldfisk 2/7-E takes place in an area where there is a significant density of infrastructure on the seabed.

In addition, the facility will be moored up to Eldfisk 2/7-E. This leads to a relatively complicated mooring system, consisting of many anchor line components acquired specifically for use at this location.

ConocoPhillips also used the Port Reval as a flotel on Eldfisk in 2005, with a similarly complex mooring system. During that operation, problems were experienced with buoyancy buoys that loosened from the mooring system.

Purpose of the audit
The purpose of the audit was to ensure that ConocoPhillips makes the location-specific assessments in accordance with the regulations, as well as that the technical condition of the Port Reval mooring system complies with regulatory requirements.

Another objective has been to evaluate whether experience gained in connection with previous mooring of the facility at Eldfisk, as well as undesirable incidents involving mooring of the facility in recent years, have been taken into account in the evaluations regarding selection of the relevant mooring solution.

Result of the audit
Our impression following the audit is that ConocoPhillips and OSM Offshore have performed thorough preliminary work in connection with the mooring of Port Reval at Eldfisk.

We note that experience from previous use of the facility at approximately the same location has been incorporated in the planning of the specific mooring system, and that a specialized mooring system has been chosen in part to ensure compliance with the regulations. Furthermore, experience gained by other players in similar anchoring operations has also been taken into account.

We have not found any nonconformities as regards the regulations, but we did identify five items with potential for improvement.

Contact person in the Petroleum Safety Authority Norway:
Mike Theiss