SeaFloat SCC-800

Technical Solution Information

©Siemens Energy 2022

Technical Information Package SCC-800 | SeaFloat | 2021 1
Siemens Energy is a trademark licensed by Siemens
AG
www.siemens-energy.com/seafloat
Our reference project Estrella del Mar III
A hybrid power plant solution (SCC-800 2x1) with integrated battery energy storage.

Technical Information Package SCC-800 | SeaFloat | 2021 2

SeaFloat fully integrated solution with up to 180.000 m³ LNG storage, LNG regasification and combined cycle
power plant scalable up to 300MW
The fully integrated New Build SeaFloat solution allows to provide clean and affordable power to locations without access to fuel.
Installation of land-based LNG terminals are not necessary anymore.

Unrestricted
3 Export Streams with conversion of old assets

The conversion of existing assets to a SeaFloat FSRP solution brings CAPEX savings, together with low fuel consumption from high efficient
equipment, low operational costs and the three export streams provide an attractive and flexible business case to our customers

Technical Information Package SCC-800 | SeaFloat | 2022 4

 SeaFloat SCC-800 barge solution complemented with LNG infrastructure

SeaFloat SCC-800
Options:

Fuel: or from
LNGC+FSRU shore

Scalable in power output for industrial application,

development of remote areas, or prime locations.
Also available as Jack-up platform.
Fuel supply from shore or via separate FSRU possible –
alternatively with FSRP concept

High efficient GT based CCPP with > 4%pts better

efficiency to reciprocating engines in Combined Cycle
and > 8% compared to open cycle or aged assets.

Emissions compared to reciprocating engines

~ 50% Lower CO2 Emissions
~ 90% Lower NOx/ CO/ nmHC Emissions
with related impact on project financing/tax
• * depending on project boundaries e.g. brownfield sites, remote areas Commercial saving:
• LCoE: Levelized CostInformation
Technical of Electricity
Package SCC-800 | SeaFloat | 2022 5
- up to 25% better LCoE than reciprocating engines
• FSRP: Floating Storage Regasification and Power - up to 20% better LCoE than land based* solutions
• nmHC: non methane hydrocarbones
Outstanding performance available in SeaFloat application
With a proven, long-term track record of more than 7 million Equivalent to, air intake filters, materials, surface treatments, and protection against
Operating Hours (EOH) from over 410 successfully installed units all over the water ingress and corrosion. Movements and deflection are addressed by
world, the SGT-800 gas turbine is an excellent choice for both, industrial power technical modifications, if necessary.
generation as well as oil and gas applications. It will meet your demand for
Our SGT-800, integrated into the combined cycle, can also be designed as full
excellent performance, efficiency, reliability, and environmental compatibility
at low lifecycle costs and the best possible return on investment. The SGT-800 integrated solution with a floating storage regasification power ship (FSRP) for
will complement your combined cycle and cogeneration installations with its LNG, as well as a gravity-based solution (GBS) like e.g. jack up platforms or
excellent efficiency. Designed for flexible operation, it is perfectly suited for other fixed platform types.
base and intermediate load as well as grid support. With SeaFloat, all proven
and well-known benefits are now available also on floating platforms. The combined cycle power plant provides highly efficient power output
The SGT-800 industrial gas turbine offers broad flexibility in fuels, operating starting from 150MW and can be scaled up in 75MW steps, depending on the
conditions, maintenance concepts, package solutions, and ratings. plant configuration.

The high degree of modularization and delivery of pre-assembled and pre-

tested plant modules minimizes both the manpower required at a construction
yard and the hook up time at place of operation.
The plant equipment is intended for on board installation based on
international codes and standards for power plants. Adaptions are Key benefits of SGT 800
implemented to suit the marine environment with respect to, but not limited
• 300MW(e) power output for a 4x1 combined cycle application
• >56% combined cycle efficiency
• More than 410 units sold
• More than 7 million fleet hours
• High reliability and availability
• Low lifecycle costs
• Robust dual-fuel (gas / liquid) DLE combustion system
• On-load fuel changeover capability
• Capable of single-digit NOx
• Dual frequency & excellent fuel flexibility LNG, LPG, NG, ethane,
propane
• Future fit: capable of burning up to 75% hydrogen

Technical Information Package SCC-800 | SeaFloat | 2022 6

 SeaFloat SGT-800 Gas Turbine

The SGT-800 gas turbines (GT) will be

provided as a single lift package and 3-
point mount installation, consisting of
turbine, mechanical auxiliary systems, gear
box, generator, and generator switch gear.
This concept allows fast and easy
installation at shipyards and is designed to
withstand nearshore conditions. The
single lift package has a weight of approx.
Figure:295t and is pre-assembled and system
Typical Single-lift Package with SGT-800
tested with dedicated electrical and
control module. Optional factory
performance testing can be conducted
upon customer’s request. The air intake
filter house has a weight of approx. 20t and
the weight of the GT enclosure ventilation
system is approx. 10t.
The single lift package concept enables 48h
core engine exchange for plants with the
highest requirements on availability. The
easy “roll out” capability of the gas turbine
core engine enables onboard maintenance
and overhaul. On the core engine “roll out
trolley” the core turbine is moved to the
on-board overhaul area of approx. 175m2
where an 8-ton gantry crane is used for
turbine inspections/ overhauls. Hot Gas
Path Inspection (HGI) and Major Overhaul
(MO) are conducted at every 30/60
thousand Equivalent Operating Hours
(EOH).

SGT-800: 22.0m x 4.7 m x 5.3 m (length, width, height)

Technical Information Package SCC-800 | SeaFloat | 2022 7

 SeaFloat SST-600 Steam Turbine

The well proven SST-600 steam turbine

(ST) will be provided as a pre-assembled
and system tested single lift package on a
3-point mount base frame. It has a weight tons
of approx. 475t in 2x1 configuration. The
steam turbine single lift package consists 475t
of steam turbine, condenser with
evacuation systems, generator, and
generator switch gear. The turbine is
directly coupled to the generator on the
admission and has an axial steam exhaust.
Siemens Energy in-house once through
steam generator is utilized, ensuring all
major components of the combined cycle
power plant are provided from one source,
allowing optimized design coordination.
Planned preventive maintenance is done
onboard. The Steam turbine area is
covered by a building and includes a
gantry crane with capacity for the various
inspection activities.

SST-600: 25.2 m x 7.0 m x 5.5 m (length, width, height)

Technical Information Package SCC-800 | SeaFloat | 2022 8

 SeaFloat OTSG Exhaust stack

The Once Through Steam Generator

(OTSG) will be provided as a package with
maximum modularization. This modular tons
approach has been applied in dozens of Piping
units worldwide and results in safer and 233t
better-quality fabrication under opti-
mized shop conditions. The arrangement
enhances faster and smoother installation
at the shipyard. The steel structure for the Heat exchanger
OTSGs is designed as one combined block.
In this way a rigid structure is formed to
withstand marine environment condi-
tions and to minimize the footprint
dimensions.
The OTSG is based on Siemens Energy
Benson Technology which incorporates a Steel structure
steam separator in the HP section of the
boiler. With over fifty proven references
globally, the steam separator provides
power plants a secure start-up operation.
The OTSG is of a robust design requiring
low maintenance and inspections which
can conveniently be performed during
gas turbine inspections and overhauls.

Each OTSG package has a weight of

approx. 233t.

OTSGs: 12 m x 19 m x 24 m (length, width, height)

Technical Information Package SCC-800 | SeaFloat | 2022 9

Footprint, main machinery Weights of main equipment for a SCC-800
SCC-800 2x1 2x1 configuration
2 x GTs, 2 x OTSGs, 1 x ST with condenser, N+1 feed water pumps, feed water
treatment system, steam and feed water dosing and sampling system, 2 x gas - GTs, 295 tons each
fuel preheaters, 2 x GT I&C control containers, 1 x ST l&C container, 1 x GT - Gas fuel preheaters, 8 tons each
main two-winding generator transformer, 1 x main transformer ST/GT, HV GIS - ST with condenser, 475 tons
switchgear (can also be located on shore) - I&C modules, 35 tons each
- OTSGs, 466 tons
The number of equipment will be multiplied accordingly for a SCC-800 - Steam cycle auxiliaries, 50 tons
3x1 or 4x1 configuration
- Main transformers, 1 x 130 tons, 1 x 120 tons
- HV GIS switchgear, 20 tons
- Aux transformers and switchgears, 90 tons
- DCS & 110VDC UPS systems, < 5 tons

Configuration Typical deck space Weight

requirement

SCC-800 2x1 ~80x38m ~3000t

SCC-800 3x1 ~95x38m ~4100t

SCC-800 4x1 ~115x38m or different ~5300t

depending on arrangement

Technical Information Package SCC-800 | SeaFloat | 2022 10

 Configuration 2x1 3x1 4x1
Main features and performance information
Gross Power output* ~147 MW(e) ~221 MW(e) ~297 MW(e)
- High GT reliability of 99.5%
- High GT availability of 98.7% with core engine exchange in 48 hours
Gross plant efficiency* ~56% ~56% ~56%
- All maintenance possible on board
- High efficiency, refer to below table
Number of SGT-800 2 3 4
- Dry Low Emissions (DLE)
- Low water consumption for steam cycle make up, minimal water treatment Steam turbine model SST-600 SST-600 SST-600
plant on board
- Design for roll & pitch, ≤3 degrees Fuel gas consumption ~5.7 kg/s ~8.5 kg/s ~11.3 kg/s
- Less emissions (e.g. COi, NOx, unburned hydrocarbons, Noise)
- High grid stability through large inertia/ rotating mass Table: Typical Performance values
- Low auxiliary consumption
- Longer maintenance intervals over the entire plant lifetime of 25 years
- High power density requiring less space on the barge

- Emissions, NOx [ppmV / - <25 / 51.3 @ 15% O2 (>50% GT load)

mg/Nm3]

- Emissions, CO [ppmV / - <5 / 6.3 @ 15% O2 (>50% GT load)

mg/Nm3]

- Installed performance at:

- 25°C ambient air temperature
- 25°C sea water temperature
- 60% relative humidity
- *) Gas fuel supply 30 Bar(a), 25ºC, 48.6 MJ/kg LHV (Siemens Energy standard
gas composition).

Table: Typical Performance values

Technical Information Package SCC-800 | SeaFloat | 2022 11

SGT-800 based plants provide high combined cycle plant efficiency, even at Siemens Energy provides generic 2D/3D models as guidance towards an
part load operation, due to the unique part load control algorithm of the SGT- optimal layout.
800. Dry low-NOx single or dual fuel burners ensure low NOx emissions
The power plant is equipped with a highly compact and highly reliable Gas
without need of water injection.
Insulated Switchgear (GIS), two incomers (2x1 & 3x1, three incomers for 4x1)
from the generator transformers and one export feeder breaker for either
Automation and control cable or overhead line connection to an onshore tie in point.
A high degree of automation and control with a fully automatized start-up and Main Generator Circuit Breakers (GCB) for the gas and steam turbine
shut-down procedure provides an efficient and safe operation of the plant generators are installed on the base frames of the turbine generator sets for
from an onboard control room as well as from a remote location, such as a load 2x1, hence no separate generator switchgear structures are required.
dispatch center.
Auxiliary power required for plant operation is derived from the auxiliary
Optimized operator and engineering environments have been considered with transformers. To keep the plant energized at plant stand still and for starting
a large flexibility for localization in various operations rooms onboard the of the GTs, power is supplied from the HV grid via the main generator step up
vessel/barge. Interfaces are available for any dedicated automation or control transformers. An optional onboard black start generator enables the start of
systems onboard by means of OPC interface to superimposed systems, SCADA the GTs even if the grid has fallen black. Such black start generators are
etc. typically part of the onboard utilities and not part of Siemens Energy scope.
Data logging, compression, and storage into history database servers ensure Steam cycle auxiliaries, MV and LV switchboards, protection and DCS panels
the evaluation of events and performance over time including a valuable for the power plant are to be mounted onboard in dedicated equipment rooms.
feature for maintenance planning. Connection to Siemens Energy service
centers for operations support and various services can be provided as part of The operation of the CCPP is based on the exhaust heat from the gas turbines
service contracts. without duct firing and without water injection for power augmentation. The
robust Siemens Energy standard DLE combustion system does not require
water injection to meet the required low NOx emission levels, by this keeping
Typical project details
the capacity of the water treatment plant low, which benefits the on-board
A typical project is characterized as a floating or fixed offshore power layout.
generation installation near to shore or moored to a jetty close to an electrical
The plant is intended for operation on gaseous fuel. Back-up operation with
substation for import of the generated power via cable or overhead lines.
liquid fuel is available as an option.
Basic design support from Siemens Energy:
An additional option is to equip the gas turbines with heat exchangers
The combined cycle power plant (CCPP) equipment is installed onboard the (glycol/water to air) in front of the gas turbine air intakes. In this arrangement,
vessel/barge with gas & steam turbine packages, OTSGs, main transformers, the inherent heat of the air assists vaporizing the LNG flow to the gas turbine.
HV switchgear and electrical and control equipment modules for turbines. In turn, the air is cooled down which, in consequence, results in higher base
load power output.

Technical Information Package SCC-800 | SeaFloat | 2022 12

The regasification plant can also be designed not only for providing LNG to the - Generator GCB and auxiliary power circuit breakers as part of the
gas turbines but to provide excess re-gasified LNG for other purposes, such as STG skid
to the onshore gas grid. The use of low-grade heat from the steam turbine - All equipment prefabricated and pre-tested
condenser for re-gasification is an efficient option. This arrangement can - Main step-up transformers in three winding designs for GT/ST
increase the overall plant efficiency up to almost 90%. combination, complete with protection relay system and on-load tap
changer for ratio control on HV side, freshwater cooling, OFWF
The power plant consists mainly of the gas turbines, the OTSGs, and one
- Main step-up transformer of two winding design for one GT, complete
condensing type steam turbine with a sea water cooled condenser. All as per
with protection relay system and on-load tap changer for ratio control
Siemens Energy “Standard Reference Plant” (SRP) design for SCC-800
on HV side, freshwater cooling, OFWF
combined cycle installations. For further details please refer to scope of supply
- Single busbar gas insulated HV switchgear (GIS), two incomers from
and performance information below. In case of restricted cooling water
generator transformers, one outgoing export feeder (option two
availability the steam turbine exhaust can also be cooled via an air cooled
feeders) for cable or overhead line to shore, complete with protection
condenser.
and automations system integrated with plant DCS system
- Naturally air-cooled epoxy insulated 7 MVA auxiliary power
Overview of Siemens Energy scope transformers, 11 or 13.8/ 6.3 or 4.16 kV for 50/60 Hz systems, for
- Basic engineering for full power plant functionality and guaranteed mounting in transformer/switchgear room on board (11/13.8 kV supply
performance from HV shore connection, starting power via main generator
- SGT-800 gas turbine packages on common base frame with 3-point transformers and Auxiliary Circuit Breakers (ACB) on GTG skid)
mount, water-cooled lube oil and generator coolers - Naturally air-cooled epoxy insulated 3 MVA 6.3 or 4.16/0.69 kV
- Electrical and control module with all electrical and I&C equipment auxiliary power transformers for mounting in transformer/switchgear
for the GTG room onboard
- Generator (GCB) and auxiliary power circuit breakers (ACB) as part - 0.69 kV switchgear for auxiliary power distribution to CCPP consumers.
of the GTG skid Feeders for N+1 configuration of condenser cooling water pumps.
- All equipment prefabricated and pretested Pumps and motors supplied by the yard. Naturally air-cooled epoxy
- One OTSGs per gas turbine insulated 1 MVA 6.3 or 4.16/0.4 or 0.48 kV auxiliary power
- Steam cycle auxiliaries, redundant feed water polishers, sampling and transformers for mounting in transformer/switchgear room on board
dosing equipment, redundant evacuation systems, N+1 feed water - 0.4 or 0.48 kV switchgear for auxiliary power distribution to CCPP
pumps consumers
- One SST-600 condensing steam turbine on 3-point mount with axial Plant DCS for the above scope with engineering and operator stations for
steam exhaust, directly mounted condenser with enlarged hotwell, fresh placing in a control room arrangement on board
water-cooled lube, and generator coolers - 110V DC UPS system for above scope
- Electrical and control module including all electrical and I&C - 230V AC UPS distribution board, UPS supply from vessel main AC UPS
equipment for the STG system

Technical Information Package SCC-800 | SeaFloat | 2022 13

 - Supervision of installation at yard at daily rates - Fire fighting system
- Cold Commissioning supervision at yard at daily rates - First fill of lube oil
- Training at yard at daily rates

Overview of shipyard’s obligation

- Installation of equipment
- Cold and hot commissioning of equipment (under Technical Field
Assistance by Siemens Energy)
- Interconnecting piping and cabling between equipment
- Pipe and cable racks
- Supporting steel structures for equipment
- Platforms and stairs
- Steam turbine building, including 85-ton gantry crane for maintenance
- Maintenance building (~175m²) for GT, including 8-ton gantry crane if
GT maintenance is to be made on board
- Electrical rooms for aux. power transformers and switchgears
- Rooms for installation of DCS UPS equipment, plant DCS panels
- MV/LV transformer(s) and sub-distribution for on board utilities
- 6.3 or 4.16 kV switchgear for auxiliary power distribution to CCPP and
utility consumers of the vessel including two feeders as dedicated
supply for the transformers and sub distribution of the vessel, normally
not part of Siemens Energy scope
- AC UPS system for plant DCS
- Control room area and necessary furniture
- Make-up water treatment/demineralization plant
- Service and instrument air system
- Fresh water-cooled circuit for GTs, ST, generators, feedwater pumps,
main transformers and sampling rack for steam and water sampling
- Sea water cooling system including condenser cooling water pumps
- Drain system from power plant drains
- Gas fuel supply, 25-200°C, 30 bar (a)
- Any black start/emergency generator

Technical Information Package SCC-800 | SeaFloat | 2022 14

Typical plant layout SCC-800 2x1 (~80x38m)

Technical Information Package SCC-800 | SeaFloat | 2022 15

Configuration SCC-800 2x1, typical main flow diagram

Technical Information Package SCC-800 | SeaFloat | 2022 16

SGT-800 SeaFloat “plug and play” power application
Benefits for yards and end customer

• Pre-engineered “plug and play” equipment, including all main components for a complete
power plant
Pre-engineered concept • Optimized general plant arrangement provided in electronic format; 3D, 2D
• Performance and functional guarantees from Siemens Energy
• Design once - build many => highest quality and lowest price

• Optimized power plant footprint giving highest power density

• Siemens Energy installation guidelines for yards
• 3-point mount single lift base frames with fastest installation of gas and steam turbine
Installation advantages packages with minimal supervision
• Gas and steam turbine packages are system tested with dedicated electrical and control
modules before shipment

• World class reliability

• Optimized design for on-board turbine maintenance
Best-in-class reliability & availability • Gas turbine core engine exchange in 48 hours for maximized availability
• Brownfield transformation: Can be installed in parallel to an operating plant to be replaced,
with no interruption of power production

• World class efficiency by Siemens Energy well proven products

• Combined cycle power plant with highest turn down efficiency at plant part load
Excellent performance • High fuel flexibility; natural gas, ethane, propane, LPG, diesel
• Robust Dry Low Emission (DLE) combustion system
• LNG gas supply to gas grid in case of FSRP solution

Technical Information Package SCC-800 | SeaFloat | 2022 17

Flexible Long-Term Programs

Siemens Energy Long Term Service Program (FlexLTP)

is tailored to support our customers achieving real outcomes
- Operational flexibility, based on actual operation
- Tailored maintenance interval and aligned maintenance planning
- Priority service, guaranteed mobilization time
- Project manager and maintenance planning services

- Remote on-line service and support

- Spare part management and spare part pool
- Forecasting of component life based on actual operation
- Access to continuous R&D activities in failure pattern recognition & advanced
- diagnostic algorithm and tools
- O&M support on all levels up to complete organization

Your needs.
-
-
Minimized cost of ownership (equipment condition based)
Solid foundation for prediction of maintenance expenses Our knowledge.
Better value.
- Extensive guarantees
- Term warranty for replacement parts
- Combined agreement for Siemens Energy rotating equipment, if required

Published by © Siemens Energy 2022| Siemens Energy is a trademark licensed by Siemens AG

For information only. Not guaranteed. Actual results are dependent on-site specifics. Subject to changes and provided on an “as is” basis without any express or implied representation or warranty of any kind and without any verification as to accuracy,
suitability or completeness, terms subject to a final contract between the parties. Actual benefits and results are dependent on a varie ty of factors such as plant specification, site specifics, operational profile and local market conditions.

Technical Information Package SCC-800 | SeaFloat | 2022 18