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Audit of bolted connections at Nyhamna

On 6 July 2006, we conducted an audit of Norsk Hydro Produksjon a.s' (Hydro's) management and follow-up of bolted connections at the land facility at Nyhamna.


Nyhamna (kilde: Hydro)

Nyhamna (Source: Hydro)

Background for the audit

Over a period of several years, many incidents involving breakage of bolts have been reported on the Norwegian shelf. Most have been associated with falling objects in connection with derricks, but other incidents have also involved load-bearing structures, mechanical systems and riser systems. Figures obtained from the report "Risk level on the Norwegian shelf (RNNS) 2005" show that the number of bolt incidents has averaged 10-12 per year during the period 1998 - 2005.

Link to RNNS 2005

Transfer of experience and learning from incidents is one of the PSA's priority focus areas. From 2004-2006, the PSA has conducted a number of audit activities aimed at the operators' management and follow-up of bolts and bolted connections on their facilities and in their projects.

This audit is based on an audit activity targeting bolted connections in Hydro in 2005.

Purpose of the audit:

  • Conduct an audit to ensure that Hydro incorporates qualified solutions for bolted connections at the land facility at Nyhamna in accordance with applicable regulations.

  • Follow up to ensure that Hydro's management of the project also ensures the robustness of bolted connections.

  • Follow up Hydro's compliance with the supervisory obligation in relation to how suppliers manage their deliveries to the project.

  • Follow up Hydro's systems and procedures for transfer of experience.

    Conduct an audit to ensure that Hydro incorporates qualified solutions for bolted connections at the land facility at Nyhamna in accordance with applicable regulations.
  • Follow up to ensure that Hydro's management of the project also ensures the robustness of bolted connections.
  • Follow up Hydro's compliance with the supervisory obligation in relation to how suppliers manage their deliveries to the project.
  • Follow up Hydro's systems and procedures for transfer of experience.
  •  

Result of the audit

Hydro has established a management system that has been implemented for the land facility project at Nyhamna.

No nonconformities were found during the audit, but we have identified one area with potential for improvement as regards access to basic technical drawings for work on bolt tightening.

Contact person i the Petroleum Safety Authority
Mike Theiss