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Subsea Control System Design Criteria
| Environmental Data |
| Water Depth |
3000-meters LAT |
| Operating temperature range |
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| Surface unit |
0°C to 40°C |
| Subsea unit |
0°C to 40°C |
| Shock |
NES 1004 ISS 2 DS 20 + Defense - Standard |
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07-55-test. A3 Up to drop test |
| Vibration |
NES 1004 ISS 2 DS 25
5 to 150 Hz @ 2-g for 6 hours |
| Subsea Equipment Design |
| Design life |
25 years |
| Intervention |
ROV deployment and intervention |
| SCM size |
850 mm x 850 mm x 750 mm high
(excluding mounting base) |
| SCM weight |
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| In air |
800 Kg |
| In water |
600 Kg (Approximately) |
| SCM housing |
Pressure compensated, dielectric fluid filled |
| Mounting |
Subsea tree or manifold structure
(ROV to AP1 17H or driver) |
| System Pressures & Fluid |
| 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 |
| Power supply |
230 or 480 Volts, 60 Hz single phase supply |
| Communications |
Option of fibre or twisted pairs |
| Subsea Instrumentation |
| Analog |
64 off two-wire analog signal, 4- to 20-mA inputs |
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Individual channel open and short circuit monitoring |
| 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 |
| 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 |
| Distance |
28-Km (10-mm cable) or 24-Km (6-mm cable) tested |
| Data rate |
2 @ 1200- to 2400-baud effective |
| Surface Interfaces |
| Electrical |
UPS generated supply to MCS/EPU |
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Motor supplies from MCC |
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DCS signals, Modbus protocol & ESD signals digital |
| Chemical injection |
Chemicals into composite services umbilical |
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