Tonsberg vs Mandal：Mooring Connector Comparison

1. Introduction

Both the Tonsberg Mooring Link and the Mandal Fairlead Shackle are specialized mooring connectors used to join steel wire ropes with fiber rope forerunners, allowing the combined mooring line to pass smoothly through a fairlead. While they serve the same fundamental purpose, they have significant differences in structural design and application scenarios, and they are NOT interchangeable.

2. Key Structural Differences

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 IndustryPractical experience indicates that the Mandal design, due to its sheave, causes significantly less wear on fiber ropes compared to the Tonsberg fixed-pin design. 

3. Technical Specifications (90T / 120T Grades)

 3.1 Mandal Fairlead Shackle Specifications

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 3.2 Tonsberg Mooring Link Specifications

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 4. Selection Guide

 4.1 Scenarios Favoring Mandal Fairlead Shackle

- Fiber ropes are frequently replaced or have high costs; minimizing wear is critical.

- Long-term mooring operations with strict requirements for rope service life.

- The low-friction characteristic of the sheave design is the primary consideration.

 4.2 Scenarios Favoring Tonsberg Mooring Link

- Installation space is limited, requiring a more compact structure.

- Higher tolerance for wear on fiber ropes.

- Simpler fixed-pin construction with potentially lower maintenance costs.

5. Common Specification & IMPA Code Reference

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 6. Important Notes

1.  NOT Interchangeable: The connection methods (how the steel wire and fiber ropes are routed) are essentially opposite between the two designs. They cannot be directly substituted for one another.

2.  Certification: Both products can be supplied with classification society certificates (e.g., DNV, ABS, BV). Buyers should confirm the required certificate type based on project specifications.

3.  Material & Finish:

    - Mandal is typically manufactured from stainless steel with a polished finish.

    - Tonsberg is typically manufactured from high-strength alloy steel with a hot-dip galvanized finish.

4.  MBL to SWL Ratio: By standard design, the MBL (Minimum Breaking Load) is typically 3 times the SWL (Safe Working Load), providing a safety factor of 3:1. 

For further technical data on specific models or to request a quotation, please contact our technical team. 

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