Page 26 - Danish Offshore Industry 2020

undeniably a little more complicated. Not at least in this has to be collected and made ready for the rebuilt Tyra
area, there has been close co-operation between people field to go back into production in the summer of 2022.
onshore and those offshore who are used to working
with the technical facilities and know them thoroughly. ‘On 28 October 2019, Patrick Pouyanné, CEO of Total,
The practical preparation work began in the autumn of visited one of the fields in the North Sea and Total’s
2019, and since the new year it has involved about 750 department in Esbjerg, along with the board of the Total
people who are getting everything ready for the crane Group. On that occasion, Patrick Pouyanné told employ-
ships’ arrival. ees in Esbjerg that he would be back for the production
start-up on the new Tyra in 2022, so we had better be
While Heerema’s crane ship, SLEIPNIR, is arriving in May ready on time,’ said a smiling Morten Hesselager Ped-
2020, Allseas’ PIONERING SPIRIT is not expected until ersen.
August/September. The reason for this lag is that a
choice has been made to focus completely on each task,
rather than doing several things simultaneously, explains
Morten Hesselager. Therefore, topsides and jackets will
also be removed separately.

However, only the jackets for the combined accommo-
dation and processing platforms will be removed. The
jackets supporting the six wellhead and riser platforms
will be re-used. ‘Since the planning of the extensive pro-
ject began, it has been a fundamental principle that we
will re-use what we can,’ emphasises Morten Hesselager.
This applies to the Tyra field’s pipelines, for example, and
is also being used in the work on the smaller platforms’
jackets. The re-using of jackets which have sunk about
five metres creates a new set of challenges. Firstly,
inspection of each element of the different jackets has
been necessary to confirm the integrity and make sure
the steel has not been damaged by corrosion or break-
age. Secondly, a full 3D scan must be made of each jacket,
as legs and rips may have been twisted and moved due
to the subsided seabed. The original drawings from the
1980s can no longer be used, and the many new scans
will serve as the basis for the future extension of each
jacket by 13 metres. The jacket extensions and new top-
sides for the wellhead and riser platforms will arrive at
the Tyra field in 2021 and will then be lowered over the
existing jackets, so it is important that all elements fit
nicely together.

Fabrication of the new topsides, modules and jackets
started in 2018 for all elements to be ready for installa-
tion offshore in 2021. The large process module, as well
as the topsides and jacket extensions for the wellhead
and riser platforms, are all being fabricated at McDer-
mott’s yard in Batam, Indonesia. The accommodation
platform is constructed at Rosetti Marino’s shipyard in
Ravenna, Italy, and jackets for the new accommodation
and process modules are fabricated at Dragados’ ship-
yard in Cadiz, Spain. First steel cut took place in all three
locations in 2018, and they are currently building as fast
as they can to reach completion and dispatch the modules,
topsides and jackets to the Danish part of the North
Sea in 2021. They are especially busy at the shipyard in
Cadiz, as the jackets for the accommodation and process
modules will be installed in the summer of 2020. The The Modern American Recycling Services shipyard in
installation of the new topsides, with a total weight cor- Frederikshavn will be responsible for decommissioning
responding to about six Eiffel Towers, will take place in the combined residential and process platforms from Tyra
the summer of 2021. At the end of 2021 and early 2022 East and Tyra West: Photo: Modern American Recycling
the final ‘hook up’ will be carried out, where everything Services.

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