Statoil ASA - Mongstad Refinery: Enhancing operational safety at Norway’s largest oil refinery

Mongstad Oil Refinery Norway - Statoil ASA - 306x172Client: Statoil ASA
Client background: Statoil ASA is a Norwegian multinational oil and gas company headquartered in Stavanger, Norway. Statoil is the largest operator on the Norwegian continental shelf, with 60% of the total production.
Project outline: By assessing all the potential hazards around how the refinery operates and how it is managed, we helped ensure that Statoil’s management and operational teams were able to handle an accident effectively and safely. Ultimately, our collaboration with Statoil thus facilitated further improvement to their risk management.

Industry challenges

Following recent improvements and modifications to the Mongstad plant and infrastructure, Statoil needed to upgrade an environmental risk and oil spill emergency preparedness analysis from 2010. Since this analysis was performed, available oil spill simulation software had been improved to yield more accurate results. Furthermore, environmental resource data for the area had been updated, and Statoil had developed highly detailed acceptance criteria for environmental damage. The basis for the analysis was thus quite altered and would likely generate different results.

Project - Statoil ASA - Enhancing operational safety at Norway’s largest oil refinery - Are Børjesson quote - 306x172.png

Authority requirements

It is an authority requirement that operators keep the risk analyses up to date with regard to activity level and accidental discharge potential. We were therefore contracted to help Statoil put in place the latest safeguards to minimise risk to life, property and the environment.

How Lloyd’s Register helped Statoil ASA

Our role in the project was two-pronged; we provided:

  1. an environmental risk analysis to investigate all hazards at the plant that could result in environmental damage, including emissions to air, discharges to ground and spills to sea
  2. an oil spill emergency preparedness analysis to evaluate the emergency preparedness organisation in place, barriers and technical measures, and update the oil spill emergency preparedness analysis accordingly.

We were commissioned to identify all hazards to the environment and categorise each according to Statoil’s guideline for classification of environmental risk. Further, based on an evaluation of the emergency preparedness organisation, barriers and technical measures, we would update the existing oil spill emergency preparedness analysis.

To attain the necessary insight into all process streams, equipment, chemicals, former incidents, routines, etc., we performed a series of multidisciplinary workshops and inspections with operating personnel from each investigated area. Based on these workshops and review of relevant documentation, the plant hazards were then mapped and compared to Statoil’s tolerance criteria for environmental risk.

Hazards that could result in large quantities of oil spill to sea were thoroughly investigated using methodologies from offshore environmental risk analyses.

To produce a detailed image of the oil’s impact on the sea, weathering data were combined with historical wind and currents data and simulated using the oil spill contingency and response software, OSCAR. This allowed us to investigate the oil’s interaction with the coastline, drift patterns and interaction with environmental resources.

We then categorised the identified hazards with and without oil spill emergency preparedness measures. This enabled us to quantitatively demonstrate the effect of emergency preparedness on the environmental risk.

Mongstad in brief

The oil refinery at Mongstad is the largest facility of its kind in Norway, with an annual capacity of nearly 12 million tonnes of crude. The plant is situated north of Bergen and receives crude oil from the North Sea while wet gas is transported via pipelines from the process facility at Kollsnes. Outputs range from petrol and diesel oil to jet fuels and other light petroleum products which are exported mainly to continental Europe.