OPGW stringing, while generally standardized, presents several common challenges that can impact project efficiency, safety, and the integrity of the cable. Our expertise and specialized equipment are designed to help overcome these hurdles:

• 1. Maintaining Correct Tension and Sag:

  • Challenge: OPGW must be strung within a very narrow tension window to prevent exceeding its Maximum Allowable Pulling Tension (MAPT) (which can damage optical fibers) or having insufficient tension (leading to excessive sag and potential ground contact). Factors like friction in stringing blocks, variations in terrain, and temperature changes can affect tension.

  • Overcoming:

    • Precision Hydraulic Pullers & Tensioners: Our equipment features closed-loop hydraulic systems with digital tension readout and automatic tension control, ensuring the set tension is maintained precisely throughout the pull.

    • Low-Friction Stringing Blocks: Use large-diameter, highly lubricated stringing blocks with non-abrasive liners to minimize friction.

    • Real-time Monitoring: Constant communication between puller/tensioner operators and tension monitoring at critical points, combined with real-time data logging, allows for immediate adjustments.

• 2. Preventing OPGW Twisting/Torsion:

  • Challenge: Twisting the OPGW can severely damage the internal optical fibers, especially in central-tube designs. This can occur due to puller/tensioner misalignment, rope lay, or unaddressed torsional forces during the pull.

  • Overcoming:

    • Anti-Twisting Swivels: Always employ high-quality, free-running anti-twisting swivels between the pulling grip and the pulling rope.

    • Non-Rotating Pulling Ropes: Use specifically designed non-rotating or low-rotation pulling ropes (e.g., braided synthetic or steel).

    • Proper Equipment Alignment: Ensure puller, tensioner, and first/last stringing blocks are perfectly aligned with the line angle.

• 3. Managing Clearances at Crossings (Roads, Railways, Power Lines):

  • Challenge: Ensuring safe clearances for OPGW over roads, railways, or other energized lines is critical to prevent accidents and property damage.

  • Overcoming:

    • Pre-Planning: Meticulous pre-stringing surveys and detailed crossing plans are essential.

    • Temporary Warning Structures: Install temporary warning structures, safety nets, or elevated gantries to ensure minimum clearances are maintained.

    • Traffic Management: Implement strict traffic control (flagmen, detours) at road/rail crossings.

    • Insulated Guards: Use insulated sleeves or guards over existing energized lines that are being crossed.

    • Communication: Maintain constant communication with crossing authorities and nearby utility operators.

• 4. Difficult Terrain and Access:

  • Challenge: Remote, hilly, swampy, or densely vegetated terrain can make equipment mobilization, setup, and cable handling extremely difficult.

  • Overcoming:

    • Specialized Access Equipment: Utilize tracked vehicles, all-terrain cranes, or even helicopters for pilot wire installation in inaccessible areas.

    • Modular/Compact Equipment: Deploy more compact and easily transportable stringing equipment where access is limited.

    • Intermediate Puller/Tensioner Setups: Break long spans into shorter, more manageable sections using intermediate pulling and tensioning points.

• 5. Damage to OPGW Outer Strands/Jacket:

  • Challenge: Abrasions, nicks, or crushing of the OPGW's outer metallic layers can compromise its long-term mechanical and electrical integrity, potentially exposing the optical fibers.

  • Overcoming:

    • Protective Stringing Blocks: Use only OPGW-specific stringing blocks with large, smooth, and properly lined sheaves.

    • Proper Handling: Avoid dragging the OPGW on the ground or against sharp objects. Use proper reel handling equipment.

    • Regular Equipment Inspection: Routinely inspect all stringing equipment (especially blocks and rollers) for wear, damage, or foreign material that could abrade the cable.

Our extensive range of OPGW stringing equipment, coupled with our deep industry knowledge and technical support, provides our clients with the tools and strategies needed to successfully navigate and overcome these common challenges, ensuring robust and reliable OPGW installations worldwide.