Disposal of concrete facilities

Some of the concrete facilities resting on the seabed on the Norwegian shelf are nearing the end of their lifetimes. In the coming years, the authorities need to address how to dispose of these.

A report has been prepared on disposal of concrete facilities on initiative from the Norwegian Petroleum Directorate (NPD), which invited the Petroleum Safety Authority Norway (PSA) and the Climate and Pollution Agency (Klif) to delve deeper into the agencies’ respective disciplines.

“In the new study we’ve looked at different technological solutions for disposal of the concrete facilities, and assessed these in relation to health, safety and the environment. The report will be included in the background material for assessment of future disposal solutions,” says Arne Holhjem, director for technology and the environment in the NPD, director for professional competence Øyvind Tuntland in the PSA and Signe Nåmdal, head of department in Klif.

The Convention for the protection of the marine environment of the North East Atlantic (OSPAR), stipulates joint provisions and recommendations for offshore petroleum activities. Pursuant to OSPAR decision 98/3 relating to disposal of disused offshore installations, all facilities must in principle be removed. As regards concrete facilities, licensees can apply for an exemption from the ban on disposal at sea.

There is little experience from removal and scrapping of concrete facilities, and little data to base analyses on. The assessment by the NPD, PSA and Klif shows that, although some facilities have installed equipment that enables them to float again (re-floating), there are many uncertainties as regards whether such operations can be implemented in a controlled manner.

The advantage of disposal on land will primarily be that the reinforcement rods, and possibly the concrete, can be recycled and the seabed can be returned to its natural condition. An alternative to scrapping and material recycling could be using all or parts of the facility, e.g. as bridge foundations or to create artificial land.

Removing facilities is not risk-free. In a worst case, an accident during preparation, re-floating, transport or scrapping could have serious consequences such as loss of life or negative environmental impact. Landing the concrete facilities for scrapping and material recycling could result in risk of discharges to sea and demolition operations on land will result in noise and dust. Available area, both onshore and offshore is required, and conflicts with the local environment can arise.

Abandoning concrete facilities on site is an alternative to landing, which can also have advantages as regards safety and be environmentally acceptable. Abandonment will have little impact on fish populations, but might conflict with fishery interests due to tied-up area. Lights and navigation equipment must be installed on abandoned facilities; the risk of conflicts with ship traffic will then be relatively small.

The English version of the report will be available in the spring.

 



Contacts
NPD:
director for technology and the environment Arne Holhjem
Telephone: +47 51 76 60 00

PSA: director for professional competence Øyvind Tuntland
Telephone: +47 51 87 62 07

Klif: head of department Signe Nåmdal, industry department
Telephone: +47 22 57 35 36


 

 

Related news

Latest news

Jotne Subsea Gas Lift for Balder Field

In April 2015, Jotne E&P was awarded an EPC contract to build the subsea gas lift manifold for Exxon Mobil on the Balder Field.

Jotne Awarded Contract for Subsea Protection Structure

In January 2016, Jotne E&P was awarded a contract for the delivery of a subsea protection structure and GRP cover for a Xmas tree at Balder field. The contract was awarded by Ocean Installer.

UiB and CMR in high-tech collaboration

Students from UiB last month joined an experiment with an ultra-high-speed camera. This was a part of the troubleshooting of the Field Kelvin Probe currently under development.

Hatteland Display at International Workboat Show 2016

Hatteland Display are highlighting its diverse portfolio of maritime displays and panel computers on its booth (#1658) at the International Workboat Show 2016 (IWBS 2016) this week.

Servogear Announces Upcoming Events

Servogear announces a busy end of November, beginning of December. They will be participating at important international exhibitions.

Teamtec and ANDRITZ Cooperation

ANDRITZ and TeamTec have signed a cooperation agreement for worldwide marketing of the SeaSOx exhaust gas cleaning system for the maritime industry. 

Export Credit Norway looking for Norway's Best Exporter

Export Credit Norway  has now opened the nomination process for the 2017 Export Award, searching the Norwegian exporter of the year. 

Global Economic Outlook

7 December, Oslo Chamber of Commerce invites to a session with insightful updates on the Norwegian and international economy.

Rebuilding for Hydrogen

M/Y “Che Guevara”, previously owned by Gaddafi, will be converted to run on hydrogen. Greenstat will lead the project and are seeking partners.