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Audit of collection of environmental data on Heidrun 9-11 December 2008

Audit: The Petroleum Safety Authority Norway (PSA) and the Norwegian Meteorological Institute (Met.no) conducted an audit of the collection of environmental data on the Heidrun facility during the period 9-11 December 2008.


The audit started with an introductory meeting on the facility to review the purpose of the audit activity. We were given a tour of the facility, including the instruments used to record environmental data.

Heidrun (source: StatoilHydro)

Heidrun (source: StatoilHydro)

The equipment and systems for collecting environmental data, procedures for reporting and use, as well as maintenance routines, were all reviewed.

Background for the audit
The quality of the environmental data collected from Heidrun is of great importance for aviation weather and the offshore flight control service, weather-dependent operations in the activities, the supply service and for the society in general as a basis for Met.no's national weather database.

To achieve a sufficient degree of accuracy in the measurements, it must be possible to document that the available values have an accuracy that is within the regulatory requirements.

Purpose of the audit
The purpose of the audit was to review the relevant procedures for carrying out, maintaining and reporting on the collection of environmental data, and to assess the technical standard of systems and equipment on Heidrun, cf. the regulatory requirements stipulated in Section 25 of the Framework Regulations on natural conditions, Section 4b) of the Information Duty Regulations on requirements for retention period and discarding of data and Section 16 of the Facilities Regulations on instrumentation for monitoring and recording with guidelines and reference to NORSOK Standard N-002. The regulatory requirements also comprise METAR (Meteorological Aerodrom Reports) observations.

Result of the audit
No regulatory nonconformities were discovered. The check of the measurements did not reveal any deviations from the recommended standard NORSOK N-002 for measuring results in excess of the tolerance limits between the operator's measuring instruments and Met.no's travelling standards.

All equipment used in the collection of environmental data was satisfactorily cleaned and in good condition. The placement of both the mechanical and acoustic anemometers in the drilling derrick is considered to be the best alternative for the best possible exposure. There is also a mechanical anemometer in the radio mast with poorer exposure.

The equipment was subjected to the applicable control routines for Heidrun. The maintenance system for the equipment is part of SAP. Both the maintenance management program and the overview of completed maintenance can be found in SAP, and can be tracked. Maintenance is carried out by the technical personnel on board Heidrun.