- March 2015
AF Miljøbase Vats tar imot de første delene av plattformen B11.
NOK 420 million
Total weight of steel
New and innovative method
H7 operated in the German sector of the North Sea from 1977 and was connected to the Norpipe gas pipeline, which runs from Ekofisk to Germany. Through the Oslo–Paris Convention (OSPAR), Norway has committed itself to the responsible removal and recycling of platforms that are not in use. AF's task was to remove steel, mechanical equipment, pipes, cables, concrete, marine biofouling and anodes.
A new and patented method in which windmill vessels with six legs, which can be jacked down to a depth of 80 metres, where they stand steady on the seabed, was used. The ship was then raised so that it reached the height of the platform’s deck. From this point, the platform was dismantled piece by piece and transported to the AF Environmental Base at Vats for source separation and recycling. The same solution was subsequently used when AF removed B11, another compressor platform in the North Sea.
H7 was removed in 2013 within budget and the stipulated time frame, and without any lost-time injuries.
The same AF team designed and carried out the project. The transfer of knowledge from H7 meant that AF used 39 fewer days to remove B11 than H7. This equates to 30% less time usage.
The B11 platform was removed in 2015 within budget and the stipulated time frame, and without any lost-time injuries.