MOSES SSIP TLP
The MOSES Self Stable Integrated Platform (SSIP) is a Tension Leg Platform (TLP) that
has inherent stability that allows quayside integration and commissioning of the topsides
to the hull structure, wet towing of the integrated platform to the installation site, andeliminates the need for expensive temporary buoyancy or crane assisted installation
assistance. The hull configuration is comprised of a central base structure, four Tendon
Support Structures (TSS) and four vertical columns. The base and TSS structures arelocated deep below the surface and provide a significant portion of the platform’s
buoyancy. Each TSS is a rectangular pontoon structure with varying depth that isoriented radialy out of the base structure. The columns are located further outboard,smaller than conventional TLP columns, and are rectangular in shape. A total of eight
tendons are supported at the end of the TSS (two at each end) via top connectors on aporch arrangement. The tendons are connected at the sea bottom on piles via bottomconnectors. The MOSES SSIP TLP can support a variety of drilling or workover rigs anda large number of Top Tension Risers (TTR’s) and flowline risers. The MOSES SSIP
TLP can be used with wet and/or dry trees in harsh and mild environments.

Technology DescriptionOverview
The MOSES SSIP TLP is a Modec-proprietary 5th generation TLP which offers superior
in-situ safety and performance, design flexibility, fabrication simplicity, and ease and riskof installation when compared with other TLP designs. The Oveng and Okume TLPs
were installed in Equatorial Guinea for Amerada Hess Equatorial Guinea in 2006 andwere the first application of the MOSES SSIP TLP.
The MOSES SSIP TLP is an integrated platform that is stable and self-installable with aquayside-integrated deck and without the use of any temporary stability modules or anexpensive heavy lift crane vessel. The novel hull form provides the superior efficiency,
constructability, and hydrodynamic performance typical of a new generation TLP while
having the stability necessary for quayside integration and commissioning, and provides
a safe open-wellbay arrangement for drilling and production.
Features of the SSIP include:•One-, two-, or three-level deck that supports drilling, production, and utility systemsand top-tensioned drilling and production risers (TTRs). The deck is integrated andpre-commissioned with the hull at quayside prior to offshore transport. The quayside
integration significantly reduces the risk and cost of offshore installation;•An efficient and easily constructed hull consisting of:oFour small radial columns which provide improved waterplane stability anddeck post support for optimum deck structural support;oA submerged unitized pontoon base structure;oFour outrigger tendon support structures (TSSs) to increase the tendon
support footprint thereby reducing the tendon loads; andoRiser support structures on the hull with TTR riser keel guides to support theexternal wellbay.

•Open end wellbay(s), enhancing wellbay safety and arrangement flexibility;•Top-tensioned drilling and production risers that can be directly supported on thedeck using fixed tensioners in mild environment locations;•Tendon mooring system connected to the hull at the tendon porch located at theoutboard end of each TSS provides improved mooring loads and station keeping.

Benefits
1. Widens the Application of TLPs
It significantly increases the water depths in which it can efficiently operate in bothmild and hostile environments, as compared to existing TLPs. This is because theTLP is lighter and the mooring footprint is more effective.

2. Reduced Installation Costs and Risks
The MOSES SSIP TLP enables the deck to be integrated at quayside and precommissioned prior to transport. The platform is stable on its own during all preservice phases including ballasting down and installation, without use of any
temporary stability modules or semisubmersible crane vessel, significantly reducing
the complexity, weather dependence and risk exposure and reduced cost of theinstallation and reduced cost of offshore hookup and commissioning, at the sametime providing additional flexibility in terms of the candidate vessels for theinstallation.
3. Well Bay Safety and Flexibility
The MOSES SSIP TLP design uses open end wellbay(s) to support top-tensioned
risers, and has a number of important advantages:•Maximum separation between the wells and quarters maximizes personnel
safety of the deck layout.

•Maximum platform safety for a blowout or fire in the wellbay enablingexpulsion of gases and flames and open side access for firefighting.

•Easy access to all dry trees and facilitates layout of jumpers, manifolds andequipment, unlike designs with a central moonpool.

•Unobstructed deck on the wellbay side(s) for safer and easy rig-up of thedrilling rig system.

•Flexibility to accommodate more TTR slots without major rework of the hull
configuration, unlike a central moonpool which may result in a step change indesign and cost.

4. Drilling Flexibility
The MOSES SSIP TLP design can be used with a wide range of existing rigs. Theend wellbay and the skid beam layout adapts to suit a wide range of drilling rigs
without structural or payload penalties or use of a pony skid to stay within theskidding limitations of existing drilling or workover/completion rigs. Drilling can be
performed with either a self-contained platform rig or a tender-assisted platform rig.
5. Superior Motions and Well-Systems Friendly
The MOSES SSIP TLP hull design has superior motions compared with otherdeepwater platforms supporting dry trees. The design deck lateral accelerations are
significantly less than those of spars and other TLP designs, improving theoperability and performance of facilities, such as the separation of production fluids
and water treating.
The low motions of the MOSES SSIP TLP combined with use of riser keel guides
enables the top-tensioned risers to be directly tied back and be supported on thedeck without use of tensioners for mild environment applications.

6. Efficient Hull
The MOSES SSIP has the best metric payload capacity per ton of structural steel of
all the deepwater platforms supporting dry trees that were shoreside integrated withthe topside (see metrics below). Note the MOSES Classic TLPs and Seastar TLPs
were integrated offshore.

TLP Steel Weight-to-Payload Ratio Versus Displacement(Payload excudes Deck Steel)
1.600
Ram-Powell
Marlin(Hull + Deck Steel)/Payload

1.400

AlleghenyMars

TyphoonMorpeth1.200

Magnolia

JollieMatterhorn
Prince

Ursa

BrutusAuger

Shenzi

1.000
Kizomba
0.800

Oveng
Okume

Conventional TLPMarco Polo
Seastar TLP

0.600

Moses Classic TLP

0.400

Moses SSIP TLP

0.200

0.000
020000

40000

60000

80000

10000012000

Displacement, st

7. Efficient DeckThe MOSES SSIP TLP deck is optimized free from hull spacing, size or water depth
constraints. Therefore, the MOSES deck structure is also very efficient due toimproved support from the radial columns that reduce the deck spans andcantilevers, thus reducing the size of the deck girders.
8. Improved Constructability
The hull design consisting of stiffened flat plates and simple connections results inimproved constructability relative to other TLPs. This results in more economical hull
fabrication and in faster construction schedules.