Sub-Sea Cable Bending Restrictors Installation
Subsea bend restrictors are critical for safeguarding cables, umbilicals, and flexible pipes at their most vulnerable interfaces. Designed for a 25-year maintenance-free service life, these systems must be installed with precision and speed to minimize vessel time and offshore operational costs.
Here is the professional procedure for the correct and efficient installation of Submarine Bend Limiters:
Phase 1: Pre-Installation & Site Preparation
Before deployment, ensure all components and environment are ready:
Resource Inventory: Verify all modular units, super-duplex fasteners, and specialized hydraulic or manual torque tools are on-site.
Surface Inspection: Thoroughly inspect the cable, umbilical, or pipe. The surface must be clean, free of marine growth (for retrofits), and undamaged to ensure a snug fit of the half-shells.
Safety Protocol: Confirm all lifting gear and personal protective equipment (PPE) meet offshore safety standards.
Phase 2: Positioning & Modular Assembly
Correct positioning is the key to managing the Minimum Bend Radius (MBR):
Strategic Placement: Locate the "Stress Concentration Point"—typically where the flexible line meets a rigid structure (e.g., J-tube bellmouth or wellhead).
Interlocking Alignment: Position the half-shell modules around the cable. Philson’s split-unit design allows for easy handling. Ensure the interlocking "male-female" joints are correctly aligned to facilitate the "lock-out" mechanism.
Phase 3: Securing & Torque Control
This phase ensures the mechanical integrity of the protection string:
Modular Fastening: Secure the modular units using the provided high-corrosion-resistant bolts.
Tension & Fit: Ensure the limiter is tightly fitted to prevent longitudinal sliding, while allowing the intended rotational movement within the designed bending envelope.
Sealing (Optional): If the project specification requires, apply sealing elastomers at the interface points to provide additional environmental shielding.
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