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Audit of environmental data collection at Gullfaks C

The Petroleum Safety Authority Norway (PSA) and the Norwegian Meteorological Institute (DNMI) conducted an audit of environmental data collection at Gullfaks C in the period 14-16 November 2007. No non-conformities in relation to the regulations were identified.


Background for the audit
The background for the audit was that the quality of collected environmental data from Gullfaks C is of great importance to the aviation weather service and aviation safety service at sea, weather-dependent operations in the industry, the supply service and also to society in general as a basis for the Met.no national weather data base.

In the interest of achieving a sufficient degree of accuracy in the measurements, is it necessary to be able to document that the available values have an accuracy which meets the regulatory requirements.

Gullfaks C

Gullfaks C (source: Bjarne Holter)

Purpose of the audit
The purpose the audit was to review relevant routines for carrying out, maintaining and reporting the collection of environmental data, and to consider the technical standard of systems and equipment at Gullfaks C, cf. regulatory requirements stipulated in Section 25 of the Framework Regulations relating to requirements for the collection of environmental data, Section 4b) of the Information Duty Regulations relating to storage and deletion of data and Section 16 of the Facilities Regulations relating to instrumentation for monitoring and registration with guidelines and reference to NORSOK standard N-002. The regulatory requirements also include METAR (Meteorological Aerodrome Reports) observations.

Result of the audit
No non-conformities in relation to the regulations were identified.

However, the measurement inspection identified some areas with potential for improvements, including one non-conformity from the recommended NORSOK N-002 standard for some measuring results beyond the tolerance limits between the air temperature measuring instrument and the control instrument for humidity, as well as for the air pressure measuring instrument and the back-up instrument for measuring QNH* at Gullfaks C's and Met.no's travelling standards.

*QNH
QNH is a Q code used in aviation. QNH is the air pressure measured at the most elevated location at the landing site in question, reduced to sea level according to the standard atmosphere. The planes' altimeters therefore have a setting where the QNH value is entered. The altimeter will then show the correct height above sea level when the plane lands.

All equipment used for collection of environmental data was satisfactorily cleaned and in good condition (the instrument cabin at the south end of the platform and the cloud altitude measuring instrument). The location of the anemometers at the top of the derrick (main anemometer) and in the antenna tower is considered the best alternative for optimal free exposure.

The equipment was subject to applicable monitoring routines for Gullfaks C. The equipment maintenance system is part of SAP. Both the maintenance management program and the overview of completed maintenance can be found in SAP, and both can be traced. Maintenance will be carried out by technical personnel on board Gullfaks C.

Contact person in the Petroleum Safety Authority Norway:
Mike Theiss