A mooring triple eye plate is a critical marine hardware component designed for securing vessels to docks, buoys, or other fixed structures during mooring operations. Characterized by its robust construction and three symmetrically arranged eyelets (or "eyes"), this device ensures reliable load distribution and enhanced safety in maritime applications.
Structure and Design
The triple eye plate typically consists of a flat, heavy-duty metal plate (often made of galvanized steel, stainless steel, or high-tensile alloy) with three reinforced circular eyelets. These eyes are strategically positioned to allow multiple connection points for ropes, chains, or synthetic mooring lines. The central eyelet is usually larger, flanked by two smaller ones, creating a triangular configuration that optimizes force distribution and minimizes stress concentration.
Key Features
1. Load Distribution: The triple-eye design enables even distribution of tension across multiple lines, reducing wear on individual components and preventing sudden failures.
2. Corrosion Resistance: Materials like 316-grade stainless steel or hot-dip galvanized coatings ensure durability in harsh marine environments.
3. Versatility: Compatible with various mooring systems, it accommodates different line configurations (e.g., breast lines, spring lines) for flexible docking setups.
4. Safety Redundancy: Multiple attachment points provide backup security, critical in dynamic sea conditions.
Applications
- Docks and Piers: Anchoring pontoons, floating platforms, or small-to-medium vessels.
- Shipboard Use: Mounted on decks or bulwarks to secure mooring lines.
- Offshore Infrastructure: Used in buoy mooring systems or permanent offshore installations.
Triple eye plates are welded or bolted onto load-bearing surfaces, adhering to marine engineering standards such as ISO 3918 or ASTM F715. Regular inspections for cracks, corrosion, or deformation are essential to maintain operational integrity.
Unlike single or double eye plates, the triple-eye variant offers superior redundancy and adaptability, making it ideal for high-load scenarios or environments prone to sudden shifts in tidal or weather conditions.
In summary, the mooring triple eye plate is a cornerstone of modern maritime safety, combining engineering precision with rugged reliability to ensure secure vessel mooring across diverse marine settings.
| Stock No. |
Chain Size(MM) |
A(MM) |
B(MM) |
C(MM) |
D(MM) |
Proof Load(T) |
Breaking Load(T) |
Weight(KG) |
| HSM030614001 |
38-46 |
320 |
168 |
50 |
76 |
81.2 |
106 |
31 |
| HSM030614002 |
48-56 |
360 |
184 |
60 |
88 |
127 |
181 |
47 |
| HSM030614003 |
58-38 |
430 |
225 |
80 |
102 |
190 |
287 |
90 |
| HSM030614004 |
70-73 |
506 |
266 |
90 |
120 |
270 |
404 |
140 |
Qingdao Haosail machinery Co., Ltd. is located in Qingdao, the central ocean city in northern China, and it is a national high-tech enterprise and technology innovation enterprise. Our company focuses on the R & D and production of the intelligent solution of deep-sea aquaculture equipment. Relying on advanced technology and reliable equipment, our company has long-term in-depth cooperation with customers in more than 20 countries such as United States, Australia, Singapore, Poland and Ukraine.
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Our team have a depth of technical ability and knowledge gained through many years of experience in lifting, rigging and safety. We can provide common lifting design, heavy work lifting design, and can non-standard product lifting design to meet customer needs.
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1. What is a mooring tri-plate?
A tri-plate is a triangular forged component with three pinholes, designed to connect multiple mooring chains or shackles in offshore anchoring systems. It enables balanced load distribution in complex mooring configurations.
2. What materials are used?
High-grade alloy steels (e.g., Grade R3-R5) with minimum yield strength of 860-1,100 MPa. Surface treatment includes hot-dip galvanizing for corrosion resistance in seawater.
3. How to install tri-plates?
- Use certified shackles (SWL ≥ chain MBL)
- Align pinholes perpendicular to load direction
- Apply torque to 30% of pin's ultimate tensile strength
- Secure with split pins/cotter keys
4. What inspections are required?
- Annual NDT: MPI for cracks, ultrasonic thickness testing
- Measure wear: ≤10% diameter reduction on pins/holes
- Replace if corrosion exceeds 20% cross-sectional area loss.
5. Failure modes to monitor?
- Stress corrosion cracking at weld zones
- Galling between pins and plate surfaces
- Fatigue damage from cyclic wave loading
- Hydrogen embrittlement in H2S environments
6. Load capacity calculation?
SWL = 0.6 × MBL (Minimum Breaking Load)
Example: For Grade R4 (MBL=2,500 kN), SWL=1,500 kN
-Always apply 1.5x safety factor for dynamic loads.*
7. How to select tri-plates?
Consider:
- Chain diameter compatibility (e.g., 84mm-152mm)
- Working depth rating (shallow/deepwater)
- Connector type: H-links vs Kenter shackles
- Anti-rotation design for twist prevention.
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