SATH

SATH strenghts

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CONCRETE

Reduced construction and maintenance costs.

LOW DRAFT

Feasible in shallow and deep waters.

SELF-STABLE

Easily transportable.

COST COMPETITIVE

Compared to bottom-fixed Offshore Wind Turbines.

Platform concept


SATH is a prestressed-concrete floating platform consisting of two cylindrical and horizontal hulls with conical ends linked to each other through bar-frame structures.

The hulls are shell structures with circular or ovoidal cross section. They are internally stiffened and divided into compartments by cross bulkheads. The tower support is fixed to the floating elements through another auxiliary structure.

In order to increase the natural periods in pitch and roll oscillations, the floating elements are attached to some flat and horizontal plates arranged submerged in the lower area of the platform.
These elements are made of solid slabs lightened with a ribbed structure.

Finally, the platform is moored with a Single Point Mooring (SPM) system that allows SATH to rotate around as a weathervane, helping yaw control system to maintain the rotor plane facing the wind.

SPM and platform ship shape allows also lower environmental loads in the mooring lines.




Single Point Mooring (SPM) system


Finally, the platform is moored with a Single Point Mooring (SPM) system that allows SATH to rotate around as a weathervane, helping yaw control system to maintain the rotor plane facing the wind.

SPM and platform ship shape allows also lower environmental loads in the mooring lines.

These elements are made of solid slabs lightened with a ribbed structure.



SATH construction



SATH construction is based in an entirely onshorised concept. All platform and turbine equipment is installed on port facilities.

Construction is carried out in a precast yard employing common means in the naval field, such as a rail transfer system and a shiplift to easily launch the platform once the turbine is completely installed.

Finally, a standard tugboat is able to transport SATH (totally seaworthy) to its final location where mooring lines and inter array cables will be waiting for the Plug & Play connection.
This onshorised construction process reduces offshore operations to the minimum.


Future of floating platforms will only be a reality

if solutions are able to achieve a competitive LCOE. SATH does it now.


LCOE


When talking about Renewable Energy it is all about reducing the Levelised Cost Of Energy.

As LCOE is composed by CAPital EXpenditures and OPerational EXpenditures, Saitec's vision is to reach this cost reduction by tackling both CAPEX and OPEX.


CAPEX

SATH is not just the most competitive floating solution for Offshore Wind Industry but it is a current cost competitive solution to fully proved monopiles.

SATH may have a slightly higher cost regarding platform manufacturing compared to monopiles, but total CAPEX is decreased by dramatical INSTALLATION COST REDUCTION, due to its Plug & Play nature.


OPEX

The Plug & Play installation capacity allows us to avoid the employment of expensive vessels for big parts maintenance causing a dramatic cost reductions on operation.

Another key point in the OPEX cost reduction target is the fact that CONCRETE has very low maintenance requirements compared to steel solutions.

Installation


One of the key points of SATH is to use concrete as material against other steel based solution. The employment of concrete added to the reduced material requirement due to Single Point Mooring innovative concept, allows SATH to significantly reduce global environmental impact on the full lifecycle.

Operation


Concrete's maintenance free capacity also reduces dramatically carbon footprint during operation compared to steel floating solutions.

Decommissioning


Floating solutions have the capacity of not leaving any component on site returning to original state. As SATH offers the most plug & play solution in the market, decommissioning is simplified reducing both costs and environmental impact. Limited mooring lines also reduces impact from mooring.

Furthermore, due to concrete´s durability, the platform could even be reused after wind farm is decommissioned. Allowing giving platform a second use and taking decommissioning from a cost to an income. As a consequence of the whole life cycle operation analysis, SATH can be considered to have the lowest environmental impact of floating solutions.