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Audit of anchoring analyses - Deepsea Delta

During the period 21-22 October and on 10 November, we conducted an audit of the site-specific anchoring analyses for use of the mobile drilling rig Deepsea Delta on Tune and Oseberg. The general impression is that the analyses are carried out in accordance with the applicable regulations.


Deepsea Delta

The Deepsea Delta (photo) is a third generation mobile drilling rig of the Ocean Ranger type, commissioned at Rauma Repola (Finland) in 1981. It has subsequently undergone a number of upgrades.

The Deepsea Delta's objective is drilling, testing, completion and maintenance of exploration and production wells.

The living quarters can accommodate 99 people.

The Deepsea Delta, which is owned by Deepsea Delta II A/S and operated by Odfjell Drilling AS in Bergen, received the Petroleum Safety Authority Norway's (PSA's) (AoC) in February 2004.

Background for the audit

Norsk Hydro has secured consent to utilize the mobile drilling rig Deepsea Delta on Tune and Oseberg for drilling and completion operations.

Link: Consent to use Deepsea Delta

This year, the PSA has conducted a series of audits aimed at site-specific analyses for mobile installations, in order to highlight these types of analyses.

Part of this audit also included a visit to the supplier of the software used in the analysis work.

Purpose of the audit

The objective of the task was to help ensure that the site-specific assessments are carried out in accordance with the regulations.

Result of the audit

The general impression is that the analyses are carried out in accordance with the applicable regulations.

However, some observations were made, both as regards items where there is a potential for improvement and non-conformances. Most observations are linked to formalization and documentation.

Our impression is that the operator has a good dialogue with the parties performing the anchoring analyses, and those who have made the software.

Both the shipping company and the operator have made extensive use of their own competence in the analysis work.

Contact person in the Petroleum Safety Authority:
Mike Theiss