Angola Pipeline Temperature Measurement Optical Cable Technology

Distributed Temperature Sensing (DTS) fiber optic cables are used for precise, long-distance temperature monitoring in pipelines, with specifications tailored for harsh environmental conditions.

DTS Cable Overview

DTS systems measure temperature along pipelines using standard optical fibers that act as linear temperature sensors. The technology relies on Raman or Brillouin optical scattering, where a laser pulse is sent through the fiber and the backscattered light is analyzed to determine temperature at specific points along the cable using Optical Time Domain Reflectometry (OTDR) or Optical Frequency Domain Reflectometry (OFDR) techniques .

Cable Types and Construction

• Armored DTS Cables: Include steel or corrugated armor to protect the fiber from mechanical damage, rodents, and harsh environmental conditions. Ideal for direct burial in pipelines or areas with extreme physical stress .
• Non-Armored DTS Cables: Use multiple layers of jacketing for protection without heavy armor, suitable for less mechanically demanding environments .
• Fiber Types: Single-mode and multi-mode fibers can be integrated within a single cable, allowing customization based on measurement range and distance requirements .
• Environmental Durability: Cables are designed to operate in extreme temperatures, typically from -269°C to 700°C, and resist water, chemicals, UV exposure, and mechanical impacts .

Installation Considerations

• Direct Burial: Armored or dual-jacketed cables are recommended for pipelines to ensure mechanical protection and maintain measurement accuracy .
• Standards Compliance: ANSI/ICEA S-87-640 and S-104-696 standards define performance requirements for outdoor and indoor-outdoor optical cables, ensuring reliability in pipeline applications .
• Cable Sheath Selection: Sheaths must balance protection and sensitivity; overly thick sheaths can reduce temperature detection accuracy, while insufficient protection can expose fibers to environmental damage .

Performance and Monitoring

• Spatial Resolution: DTS cables can provide temperature readings with a resolution down to 1 meter, enabling precise detection of leaks or hot spots along pipelines .
• Long-Distance Coverage: Capable of monitoring pipelines over dozens of kilometers continuously .
• Integration: Can be combined with Distributed Acoustic Sensing (DAS) for simultaneous vibration and temperature monitoring .

Summary

For Angola pipeline applications, armored DTS fiber optic cables with single-mode fibers, dual-jacket protection, and compliance with ANSI/ICEA standards are recommended. These cables provide accurate, real-time temperature monitoring under harsh environmental conditions, ensuring pipeline integrity and early detection of leaks or anomalies .