5.1.4.2. Boom and tension member
Two possible installation procedures are described in
Table 5.1. The installation costs for the two scenarios are
estimated using figures obtained from www.marinemoney.
com. The total installation costs of the scenarios
are compared in Table 5.2, which shows that Scenario 2 is
likely cheaper (3% difference in base case).
However, because of the added new risks and uncertainties
of this dragging operation, we have chosen Scenario
1 for this feasibility study and will be using the relevant
amounts for the cost calculations in Chapter 10.
For decommissioning, these costs are assumed to be the
same as for installation.
5.1.4.3. Platform
Tugging the Spar platform will require a specialized ship,
the estimated day-rate for such a ship is €400,000 per
day. With an average sailing speed of 12 knots or approximately
22 km/h the ship will need 7 days for the return
trip, resulting in a total cost of an estimated €2,800,000.
The SWATH vessel can just sail itself to the required location,
the marine fuel required for this is negligible relative
to the scope of this project.
These costs are assumed to be the same for decommissioning
as for installation.