Learn how Audubon Engineering Solutions executed adaptive and robust techniques to meet and exceed Delta House project expectations, as well as position LLOG Exploration for continued success.

1. OTC-25755-MS
Delta House – Topsides Design Philosophy
J. Denis Taylor, P.E.
Managing Partner
Audubon Companies

2. Overview
1. General information
2. Design considerations
3. Process
4. Sales pipelines
5. Condensate stabilization
6. Layout
7. Weight & CG
8. Health, Safety & Environmental
9. Process and safety controls
10. Regulatory and compliance
11. Future developments
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OTC-25755-MS • Delta House – Topsides Design Philosophy • J. Denis Taylor, P.E.

3. General
What is Delta House?
1. Semisubmersible floating production System (FPS)
2. Subsea host
3. Located in the US Gulf of Mexico, Mississippi Canyon, Block 254
4. Water depth is 4500’
5. 18 Riser porches for SCRs (2 departing pipelines, 16 incoming
production flowlines)
6. Moored via 12 chain & polyester mooring lines
7. Designed for dry truss in a 1000 year storm
8. 38 person permanent quarters, 12 person temporary quarters
9. Hull built at Hyundai Heavy Industries in South Korea
10. Topsides equipment built on U.S. Gulf Coast and integrated at Kiewit
11. Integration of topsides and hull at Kiewit with Heavy Lift Device
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OTC-25755-MS • Delta House – Topsides Design Philosophy • J. Denis Taylor, P.E.

4. Design Considerations
1. Hull sizing
• Too much payload for the OPTI-EX Hull  New Hull Design
2. Single lift of an integrated topsides with Heavy Lift Device (HLD) at
Kiewit Offshore Services
3. Center of gravity must be close to geometric center to not overload
one of the two HLD booms
4. Platform to possibly be installed in one of several fields identified by
LLOG Exploration
5. 25 year design life
6. Design for metocean conditions in Central Gulf of Mexico
7. Design to be a basis for future LLOG Exploration FPS
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OTC-25755-MS • Delta House – Topsides Design Philosophy • J. Denis Taylor, P.E.

5. Process
General
1. Dual SCR flowlines from each drill center manifold
2. Well SITP < 10,000 psig
3. Design Rates
• 80,000 BPD crude oil (100,000 BPD Peak Rate)
• 200 mmscfd natural gas (240 mmscfd Peak Rate)
• 40,000 BPD produced water
4. Design oil gravity is 28 to 37 oAPI
5. Designed for sweet production
• No measureable traces of H2S & CO2
6. GOR is roughly 1600 (Changed to 2000 during design)
7. Typical oil treating system
8. Condensate Stabilization System installed after one well
tested high in Propanes, Butanes, & Pentanes
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OTC-25755-MS • Delta House – Topsides Design Philosophy • J. Denis Taylor, P.E.

6. Oil Treating Schematic
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OTC-25755-MS • Delta House – Topsides Design Philosophy • J. Denis Taylor, P.E.

7. Gas Treating / Compression Schematic
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OTC-25755-MS • Delta House – Topsides Design Philosophy • J. Denis Taylor, P.E.

8. Produced Water Treating Schematic
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OTC-25755-MS • Delta House – Topsides Design Philosophy • J. Denis Taylor, P.E.

9. Sales Pipelines
Oil Pipeline
• Flows to Shell Pipeline
• 12.75” OD x 0.844” wt
• ANSI 1500#
• MAOP is 3550 @ 150oF
• Steel Catenary Riser
• Specifications:
• Max RVP:
• April to Sept = 8.6 psia
• Oct to Mar = 9.6 psia
• < 1% BS&W
• <= 120oF
• < 50 ppm methanol content
Gas Pipeline
• Flows to BP Pipeline
• 16” OD x 0.688 wt
• ANSI 900#
• MAOP is 2127 @ 150oF
• Steel Catenary Riser
• Specifications:
• < 7 lbs/mmscf water content
• <= 120oF
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OTC-25755-MS • Delta House – Topsides Design Philosophy • J. Denis Taylor, P.E.

10. Condensate Stabilization
1. One reservoir had a very high content of C3, C4, & C5 (NGLs)
2. Oil Pipeline RVP requirements could not be met with “Normal
Processing”
3. Condensate Stabilization system added to separate NGLs from
crude oil stream
4. NGLs flow to the gas pipeline
5. Benefits gas sales due to higher BTU value
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OTC-25755-MS • Delta House – Topsides Design Philosophy • J. Denis Taylor, P.E.

11. General Arrangement
1. Two level deck structure (225’ x 225’)
2. Dry lower truss in a 1000 year storm
3. Layout in accordance with API 14J guidelines
4. Flare boom and turbine exhausts on platform north
5. 40 Ton, 150 ft boom Seatrax cranes on either side of platform
6. Flowline and pipeline risers are routed inboard of columns
7. Most equipment installed on upper level (“Texas Deck” design)
8. Lower level equipment:
• Flare / Vent Scrubber
• Rainwater Sumps
• Flowline Launcher / Receivers
• Sewerage Treatment Unit
• One of Two Firewater Pumps
• Survival Craft on North Side
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OTC-25755-MS • Delta House – Topsides Design Philosophy • J. Denis Taylor, P.E.

12. Platform Elevation View
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OTC-25755-MS • Delta House – Topsides Design Philosophy • J. Denis Taylor, P.E.
EL. + 96’ - 9”
T.O.S. Upper Deck
EL. + 72’ - 2”
T.O.S. Lower Deck
EL. + 0’ - 0”
M.S.L.
EL. + 98’ - 5”
Bottom of Hull

13. Platform Upper Level
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OTC-25755-MS • Delta House – Topsides Design Philosophy • J. Denis Taylor, P.E.
Booster Compressor Module
Glycol Regen Skid
LACT & Pipeline Pumps
Emergency Generator
Quarters Module
Fuel Gas
Waste Heat Recovery
Power Generation
Flash Gas
Compressor
Chemical Injection Skid
Condensate
Stabilization
Production
Module
Temporary
Quarters
MCC/Control Room

14. Weight & CG
Cases for weight & CG monitoring:
1. Lift of topsides onto hull
• Vessels, tanks, & piping empty
• No personnel onboard
2. Transit TX to site
• Only needed fluids onboard – potable water, diesel, etc.
• Minimal personnel onboard
3. Operating – Producing Maximum Rates
• Equipment, tanks, vessels, pipes filled with production fluids,
chemicals, diesel fuel, potable water
• Maximum personnel onboard
4. Storm
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OTC-25755-MS • Delta House – Topsides Design Philosophy • J. Denis Taylor, P.E.

15. Weight & CG
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OTC-25755-MS • Delta House – Topsides Design Philosophy • J. Denis Taylor, P.E.

16. Health, Safety & Environment
1. Designed to BSEE Regulations & U.S. Coast Guard Requirements
2. DNV provided CVA oversight on equipment/systems for USCG
3. Active & passive fire protection systems
4. 50 person survival craft on platform north and south sides
5. Safe muster area protected by quarters
6. HSE Studies:
SEMS – Safety and Environmental Management System
HAZID – Hazard Identification
FERA – Fire Explosion Risk Assessment
DORA – Dropped Object Risk Assessment
EERA – Escape, Evacuation, and Rescue Analysis
HAZOP – Hazard and Operability Study
ESSA – Emergency Systems and Survivability Study
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OTC-25755-MS • Delta House – Topsides Design Philosophy • J. Denis Taylor, P.E.

17. Process & Safety Controls
1. Allen Bradley L73 ControlLogix PLC Control System
• Segregated process control and safety system
• Redundant processors on both systems
2. Fully virtualized server infrastructure with multiple layers of redundancy to
prevent single failure points
3. Factory Talk SE, version 7.0 HMI with use of Thin Client technology for quick
deployment of the application and limitless expandability
4. Certain On-deck Instrument Junction Boxes have touch screens operator
interface for quick access to facility controls and provide easy access for
infield equipment testing
5. Separate control system and control stations provided for
• Hull system controls, Subsea control system and Solar Turbine control
systems.
• All system integrated into the topside control system for historization of
data and operator alarming
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OTC-25755-MS • Delta House – Topsides Design Philosophy • J. Denis Taylor, P.E.

18. Regulatory & Compliance
Classification
• DNV served as the Classification Society
• Class Notation “OI Column Stabilized Production Unit POSMOOR”
Marine Regulatory Compliance
• DNV served as the CVA for the U.S. Coast Guard
• Delta House was not flagged but follows the LLOG “Delta House”
Regulatory & Design Basis Agreement between USCG & DNV
Systems Impacted
• Hull Systems
• Systems Integral to Safety & Habitability
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OTC-25755-MS • Delta House – Topsides Design Philosophy • J. Denis Taylor, P.E.

19. Future Developments
“One Size Fits Most”
• Delta House FPS is the basis for future LLOG Exploration deep water
developments
• Only need to tweak the Delta House design for specific PVT & site
specific information (i.e. resize compressors for specific GOR, etc.)
• Suggested operational changes are used from Delta House operators
• Benefits of the installation of modules/equipment on a single deck:
1. Platform components (i.e. modules, skids, buildings, etc.) can be
built off site and installed as delivered
2. For future developments, only remove and replace equipment that
is re-sized for process conditions
3. Engineering is minimized saving cost and schedule
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OTC-25755-MS • Delta House – Topsides Design Philosophy • J. Denis Taylor, P.E.

20. Thanks to Co-Author
Bobby Foret, PMP
Audubon Engineering Solutions
Special Thanks to
Rick Fowler, Bruce Cooley & Craig Mullett
Of LLOG Exploration
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21. Questions?
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