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Audit of electrical and safety instrumented systems on Troll A

Audit: During the period 16 – 18 June 2008, the Petroleum Safety Authority Norway (PSA) conducted an audit of StatoilHydro on the Troll A facility. We focused on the company’s compliance with requirements related to electrical and safety instrumented systems.


Background for the audit
The PSA shall lay down conditions for and follow up the players in the petroleum industry to ensure that high standards are maintained for health, safety and the environment, and thereby also contribute to creating the greatest possible value for society.

The PSA shall also contribute to reducing the risk level in the petroleum industry by following up the players to ensure that they facilitate technical and operational integrity, and follow up the inter-action between man/technology/organisation in critical systems related to HSE.

Electrical and safety instrumented systems constitute vital parts of the technical barriers on a facility, and sound safeguarding of these is important in order to maintain an acceptable risk level.

Purpose of the audit
The purpose of the audit was to verify that StatoilHydro plans, manages and executes its activities in relation to the HSE regulations in an efficient and goal-oriented manner.

The PSA also wanted to obtain information on and experience from operation of the HVDC system on Troll A.

Troll A (source: StatoilHydro)

Troll A (source: StatoilHydro)

Result of the audit
Our general impression following the audit is that the condition of the electrical and automation systems on Troll A is satisfactory.

However, we did identify three deviations from the regulatory requirements. These were related to impairment of the insulation system for emergency bilge pumps in the shafts, marking of battery banks and arrangement at exits from rooms for high voltage installations.

In addition, the audit report contains observations on areas where there is a potential for improvement.