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Oil Platforms for the Offshore Oil Field
“Schwedeneck-See”, Baltic Sea, Germany
OFFSHORE
WIND
Schwedeneck-See, Platform A
The first two German offshore oil platforms were erected in the oil field “SchwedeneckSee” within the bight of Kiel in 1983. These two structures are reinforced concrete
constructions, having been built in a dry dock and afterwards floated to their working
positions.
Client:
Consortium Deutsche
Texaco Aktiengesellschaft/
Wintershall AG, Germany
The reinforced concrete constructions were laid out for the specific hydrographical
conditions of this Baltic Sea area. The local water depth at position of platform A is
25 m and 17 m at platform B.
Construction Costs:
about 300 mill. DM
Below inner and outer wall a sheet pile wall is bound into the base slab. These sheet
piles penetrate the ground while lowering the platform into the seabed and transfer the
horizontal forces into deeper bearing soil layers. Foundation joints are closed by high
pressure injections.
Services:
Site supervision
Period:
1983
Only 8 months lay between site mobilisation and the sinking of the platform at its final
position at the Schwedeneck-See.
The construction is laid out for a gentle removal when its task will be finished.
For the construction, the sea transport and the sinking of rig A, the following working
sequence was applied:
•
•
•
•
dry dock 8a at HDW in Kiel
construction of reinforced concrete structure up to the wall tops
floating completion within the harbour of Kiel and partially ballasting up to a
draught of 12 m
sea transport to the Eckernförder Bay for further ballasting
sea transport to the final sinking location
Project-No. 1935
Sellhorn Ingenieurgesellschaft mbH, Teilfeld 5, 20459 Hamburg, Germany, Phone+49 (0)40 36 12 01-0, Fax +49 (0)40 36 12 01-28
[email protected], www.sellhorn-hamburg.de
LKP 20110930
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Parallel to these activities the outfitting of pipeline systems and steel construction
elements was carried out.
Because of the limited construction period it was not acceptable to allow for any leeway.
Therefore it was necessary to clarify any potential design conflicts between the involved
parties on site and immediately.
Aside from quality control of concrete works intensive checks on steel construction
elements, pipeline systems and especially on welding works and corrosion protection
systems were carried out. Because of the remarkable stress of the structure in the
offshore position the quality of welded joints and the corrosion protection system was
of decisive importance for stability, lifetime and maintenance as well as for tightness
and reliability of pipeline systems. Of further priority was the check of structure
geometry, because the floating stability was depending from exact load distribution.
After flooding the dry dock nearly 300 m long joints at the bottom proved to be as tight
as concrete walls, base and pipe breakthroughs.
Site supervision was performed by up to seven engineers at the same time being on
daily duty for 24 hours, seven days a week. All correspondence and supervision was
held in English.
Project-No. 1935
Sellhorn Ingenieurgesellschaft mbH, Teilfeld 5, 20459 Hamburg, Germany, Phone+49 (0)40 36 12 01-0, Fax +49 (0)40 36 12 01-28
[email protected], www.sellhorn-hamburg.de
LKP 20110930
OFFSHORE
WIND