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Subsea Production Control Systems
Quick Links to Information Below
- Overview of the Subsea Control System
- Components of the Subsea Control System
- Principle Component Manufacturers
- Subsea Control System Design Criteria
- FPSO Development
PDF Documents
Overview of the Subsea Production Control System
eP’s electro-hydraulic multiplex subsea control system is a modular design concept incorporating well proven technology and qualified components to minimize both CAPEX and OPEX costs.
An integrated system provides the requisite monitoring, control, and shutdown functions by means of multiplexed electro-hydraulic control, using communications on power between a surface master control station (MCS) and subsea control module (SCM) via a composite services umbilical and appropriate subsea distribution unit(s).
Communications between surface and subsea are by means of a ‘Lonworks’ power line carrier. Communications can be adapted to suit comms on power, twisted pair, or fiber optic dependent on configuration.
The system is designed for deployment and intervention by means of a remotely operated vehicle (ROV), assisted guideline and guidelineless running tool, available for rental with ROV assistance in very deep water, featuring a simple sliding plate design locking down mechanism; however a similar module is used for diver installation.
The subsea electronics module (SEM) is surface removable and replaceable without the need to disturb the module’s hydraulics chamber.
Electric and hydraulic connections are made using low-force connectors mounted on the base of the unit, which connect when the unit is locked into place.
When offloading is required a CALM buoy can be used. Remote operation of valves is required complete with data acquisition from the buoy, which can be rate of approach, hawser loading, etc. eP can offer this package which includes a hydraulic power unit, buoy situated RTU, communications, solar power and navigation aids, therefore providing the complete solution from the subsea wellhead to the tanker.
Components of the Subsea Control System
The principle components and subsea systems available are:
- Master Control Station
- Duplex PLC Control
- Subsea Network Management
- Windows Based MMI
- Duplex Platform Control System Interface
- Workover & Intervention Systems
- Workover Control
- Early-Production Systems
- Direct Hydraulic
- Multi-Plexed Electro-Hyrdaulic
- Air Driven Winches
- Hydraulic Power Unit
- Dual Pressure Levels
- Fluid Clean-Up System
- Autonomous PLC Controls
- On-Board Motore Starters
- Compact Turret Mount Designs
- AC/DC Electrical/Pneumatic Power
- Umbilical Pull-in Head
- Umbilical Termination
- Umbilical Core Protection for Installation
- Subsea Accumulator Module
- Modular Design
- Available In 3 Sizes
- Diver or ROV Installation
- Electro-hydraulic Distribution Unit
- Umbilical Junction Boxes
- Simple Modular Design
- Diver or ROV Connectors
- Hydraulic/Electrical + Chemicals
- Diver Installed Control Module
- Multiplexed Controls
- Shear-Seal Directional Control Valves
- Diver or ROV Connectors
- Functions To Control up to 2 Wells
Principle Component Manufacturers
Master Control Station |
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GE Fanuc "90-30" |
Programmable logic controllers |
Capex |
Ruggedized personal computer, monitor, keyboard, and mouse |
Wonderware "Intouch" |
Graphics displays |
Electrical Power Unit |
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XP |
UPS |
EA Tech |
Power line modems |
Bender |
Line insulation monitors |
Hydraulic Power Unit |
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Marshalsea "XW" |
Hydraulic pumps |
Fluidpower "FP" |
Solenoid valves |
Pall "HH 9051" |
Hydraulic filters |
Fawcett Christie |
Hydraulic accumulators |
Delta "R 387" |
Pressure transmitters |
GE Fanuc "90-30" |
Programmable logic controllers |
Chemical Injection Unit |
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Lewa |
C.I. pumps |
Litermeter |
Flowmeters |
Skoflo |
Flow control valves |
Subsea Umbilical Termination & Distribution |
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Pacson "GA 0935" |
Isolation valves |
Tronic "Mini CE" |
Conductive connectors |
Mandeville |
Hydraulic couplings and stab plates |
Subsea Control Module |
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Tronic "Mini CE" |
Conductive connectors |
Mandeville/Rotator |
Directional control valves, hydraulic couplings, shuttle and ESD valves |
Pall "HH 9050" |
Hydraulic filters |
Druck |
Integral pressure transmitters |
Seacon "Minicon" |
Electrical penetrators |
Subsea Control System Design Criteria
Environmental Data |
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Water Depth |
3000-meters LAT |
Operating Temperature Range |
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0°C to 40°C |
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0°C to 40°C |
Shock |
NES 1004 ISS 2 DS 20 + Defense - Standard |
07-55-test. A3 Up to drop test |
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Vibration |
NES 1004 ISS 2 DS 25 |
Subsea Equipment Design |
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Design Life |
25 years |
Intervention |
ROV deployment and intervention |
SCM Size |
850 mm x 850 mm x 750 mm high |
SCM Weight |
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800 Kg |
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600 Kg (Approximately) |
SCM Housing |
Pressure compensated, dielectric fluid filled |
Mounting |
Subsea tree or manifold structure |
System Pressures & Fluid |
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High Pressure |
1034 barg MWP |
Low Pressure |
207 barg MWP |
Control Fluid (standard) |
Water based biodegradable, open loop or petroleum based synthetic mineral oil |
Control Fluid Cleanliness |
NAS 1638 Class 6 |
Supply Filtration |
Integral single B3 - 200 rating elements (3-micron) |
Electrical |
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Power Supply |
230 or 480 Volts, 60 Hz single phase supply |
Communications |
Option of fibre or twisted pairs |
Subsea Instrumentation |
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Analog |
64 off two-wire analog signal, 4- to 20-mA inputs |
Individual channel open and short circuit monitoring |
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Accuracy |
±1.5% FS excluding sensor |
ADC Conversion |
12-bit (1.5% resolution) |
DHPT |
4 off as specified |
Frequency |
2 off two-wire frequency signal, 0- to 10-Khz inputs |
Serial |
4 off serial I/O |
Subsea Tree Valve Actuators |
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HP Control Function |
2 off with output monitoring |
LP Control Function |
24 off with output monitoring |
ESD Control Function |
2 off with output monitoring |
Communications |
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Distance |
28-Km (10-mm cable) or 24-Km (6-mm cable) tested |
Data Rate |
2 @ 1200- to 2400-baud effective |
Surface Interfaces |
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Electrical |
UPS generated supply to MCS/EPU |
Motor supplies from MCC |
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DCS signals, Modbus protocol & ESD signals digital |
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Chemical Injection |
Chemicals into composite services umbilical |
FPSO Development
eProduction Solutions offer a total control systems solution for turnkey projects for subsea and surface applications. We can provide a full service of build and subsea test facilities for a diverse range of control products.
eP can provide complete process system solutions offering:
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With increasing restrictions being imposed on operators, more economic solutions need to be constantly invented. FPSO development offers greater flexibility to operator for smaller marginal subsea projects with extended life for future contracts. |
eP Subsea Components
Hardware
- Brisco ROVCON
- Brisco Wellcon System Technology
- Brisco Hydraulic Power Units
- Master Control Station (MCS)
- Electrical Power Unit (EPU)
- Chemical Injection Unit
- Subsea Control Module
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Copyright © 2007 eProduction Solutions, Incorporated. All rights reserved. |
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