Disposal of concrete facilities

betonginnretning-rapport
04.06.2012
This report was prepared on the initiative of the Norwegian Petroleum Directorate (NPD), which invited the Petroleum Safety Authority Norway (PSA) and the Climate and Pollution Agency (Klif) to study technological challenges and aspects related to health, safety and environment in connection with disposal of concrete facilities on the Norwegian continental shelf.

We are facing a period when disposal decisions will have to be made for the large concrete facilities built from 1973 – 1995. Little experience is available as regards removing and scrapping such facilities, and there is little direct data on which to base analyses.

According to OSPAR decision 98/3 relating to disposal of disused offshore facilities, the basic rule is that all facilities shall be removed. However, applications may be filed for exemption from the prohibition against disposal at sea, for both permanent and floating concrete facilities.

In light of the fact that the large concrete facilities have a number of common features as regards construction and technical condition, it was considered expedient to carry out a general review of the issues and challenges related to the various disposal solutions for these facilities.

The report reviews refloating, towing the facility, demolition, scrapping and re-use. Allowing the concrete elements to remain in place is another alternative that has been studied. Three sub-assignments have been out-sourced; these have been carried out by Dr. techn. Olav Olsen a.s, Multiconsult AS and AF Decom Offshore AS.

 

 

Norwegian Petroleum Directorate, Stavanger

Climate and Pollution Agency, Oslo

Petroleum Safety Authority Norway, Stavanger

 

March 2012