Mooring Chain for Offshore Rig Platform
Mooring Chain for Offshore Drilling Platform
The mooring chain for offshore drilling platforms is a critical load-bearing component that ensures the safety and stability of floating drilling and production units. It plays an essential role in connection and positioning within offshore engineering. Its primary function is to securely link the platform to seabed anchors, forming a reliable mooring system that resists external environmental forces such as wind, waves, currents, and tides—ensuring the platform maintains stability and operational accuracy even in harsh sea conditions.
- Structural Design and System Configuration: Our mooring chains typically adopt a 12-line multi-point mooring system, with chains arranged radially to evenly distribute tension in all directions. Each chain can reach a length of 1,700–2,250 meters and a diameter of 84–89 mm, customizable according to water depth, operational area, and environmental conditions. The system can be integrated with high-holding-power anchors, tensioning systems, and monitoring devices to achieve automated mooring management and real-time status monitoring.
- Material and Strength Grades: The chain body is forged from high-toughness 22MnCrNiMo alloy steel, offering excellent tensile strength and impact resistance. Manufactured in strict compliance with international standards, the chains are available in strength grades R3, R3S, R4, R4S, R5, and R6. Among them, R6 represents the highest grade, with a minimum breaking load of up to 1,140 MPa, capable of withstanding extreme stresses caused by Category 16 typhoons and deepwater operating conditions.
- Corrosion Resistance and Durability: To withstand prolonged offshore service, the chain surface undergoes multiple protective treatments, including thermal zinc spraying, electroplating, epoxy coating, and cathodic protection, effectively preventing seawater corrosion and wear. Optional anti-abrasion sleeves and corrosion monitoring sensors are available to further enhance durability, reliability, and operational safety.
Marine Stud Link Mooring Chain
Our stud-link mooring chains are primarily used in offshore drilling platforms, deep-sea aquaculture systems, floating offshore wind turbines, deep-water mooring systems, FPSOs (Floating Production Storage and Offloading units), and other marine development facilities.
Since mooring chains operate continuously while immersed in seawater, they must possess not only high strength and toughness but also exceptional resistance to seawater corrosion, fatigue, and abrasion. These properties ensure long-term safety and reliability under harsh marine conditions.
Stud-link mooring chains have long been used for shallow-water mooring of MODUs (Mobile Offshore Drilling Units) and FPSOs. They have proven to be strong, reliable, and relatively easy to handle. The stud between each link enhances stability, prevents deformation under load, and facilitates safer lifting and connection during installation and maintenance operations.
Offshore Studless Mooring Chain
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Offshore Mooring Chain Mechanical Properties
Grade | Yield Point (N/mm2, min) | Tensile Strength (N/mm2, min) | Elongation (%, min) | Reduction Of Area (%, min) | Charpy V-notch | ||
Test Temperature (C) | Impact(J, min) | ||||||
Base Part | Weld Part | ||||||
API Spec. 2F(ORQ) | – | 641 | 17 | 40 | 0 | 58 | 49 |
-15 | 40 | 36 | |||||
ABS/RQ3 DNV/NVR3 | 410 | 690 | 17 | 50 | 0 | 60 | 50 |
-20 | 40 | 30 | |||||
ABS/RQ3s DNV/NVR3s | 490 | 770 | 15 | 50 | 0 | 65 | 53 |
-20 | 45 | 33 | |||||
ABS/RQ4 DNV/NVR4 | 580 | 860 | 12 | 50 | -20 | 50 | 36 |
ABS/R4S DNV/NVR4S | 700 | 960 | 12 | 50 | -20 | 56 | 40 |
ABS/R5 DNV/NVRS | 760 | 1000 | 12 | 50 | -20 | 58 | 42 |
R6 | 900 | 1100 | 12 | 50 | -20 | 60 | 44 |
Testing Load Of Mooring Chain and Accessories
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- Room 206,Sanhe Building, Donglian Road, ShaHeKou District Dalian, China
