DNV developing best practices for Arctic offshore structures

DNV is kicking off a new joint industry project in order to improve existing industry guidelines for the safe design of both fixed and floating structures in Arctic offshore regions.

Offshore staff

HOUSTON -- DNV is kicking off a new joint industry project in order to improve existing industry guidelines for the safe design of both fixed and floating structures in Arctic offshore regions. Several oil and gas players have already committed themselves, and a recommended practice for ice effects on offshore structures will now be developed, the organization says.

The most important standard for Arctic offshore structures is ISO 19906 (Petroleum and natural gas industries - Arctic offshore structures), says DNV. This is intended to harmonize and update existing regional and national codes and to ensure that Arctic offshore structures provide an appropriate level of reliability with respect to personal safety, environmental protection and asset values, the company says.

"However, ISO 19906 is "open-ended" in a number of its recommended design practices, and does not contain specific requirements for mobile drilling units or FPSOs for cold regions," says Gus Cammaert, DNV's director for Arctic technology.

The DNV-led joint industry project will produce a recommend practice (RP) for ice effects on Arctic offshore structures. The document will identify and discuss issues that should preferably be addressed during the concept screening or FEED stage.

The main scope is to provide practical guidance on key issues related to the following topics:
-Design methodology, particularly relating to safety philosophy and probabilistic design
-The characteristics, properties and conditions of sea ice and icebergs in selected areas
-Ice action scenarios and load prediction algorithms for fixed and floating structures
-A discussion of structure response for key design issues
-Case studies for fixed and floating structures.

In close dialogue with the ISO working group, the RP will be a companion document to the ISO19906 standard. The RP should be considered as a supplement to ISO19906's provisions, DNV says.

Some of the major participants include StatoilHydro, Shell, Transocean, Daewoo Shipbuilding, Hyundai Heavy Industries, Aker Arctic, and Olav Olsen.

05/06/2009

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