High Strength 10mm 12mm 12 Strand Uhmwpe Fiber Braid Line Marine Sail Rope Yacht

1. General Description

QINGDAO JINCHENG MARITIME has serial products including varieties of nylon, polypropylene filament, polypropylene, polypropylene /polyester mixed, polyester. It started a new epoch of rope and cable industry in the country and its products have advantages of reasonable braided structure, scientific technology, high strength, low elongation,wearing resistance, anti-corrosion and simple operation, it is particularly suitable to make large scale ropes and cables as well as anti -static ropes therefore they are well received by broad customers, The products are mainly used in fields of shipbuilding, ocean transportation, national defense and military industry, sea petroleum and harbor operation etc.

2. Main performance

3.Technology Comparison

Coil length: 220m

Spliced strength:± 10% lower

Weight and length tolerance:±5%

MBL=Minimum Breaking Load conform ISO 2307

Other sizes available upon request

4.Parameter Table

# Precautions for Using Eight-Strand Mooring Lines in Different Sea Conditions

The safety of vessel mooring is directly related to sea conditions. Although eight-strand mooring lines offer high strength and fatigue resistance, their load-bearing state, wear risk, and environmental impact vary significantly across different sea conditions—such as calm waters, windy/wavy waters, and strong storms/swells—requiring tailored operational and protective strategies to ensure mooring safety.

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## 1. Calm Waters (Sea State 1-2: Wave Height <1.25m, Wind Speed <5.5m/s)
In calm waters, sea conditions are stable, and mooring lines are primarily under **static load**. Risks focus on routine wear and basic maintenance. Key precautions include:

1. **Load Balance Check**: Although there are no significant wind/wave impacts, regularly (every 4 hours) check the tension of all eight-strand mooring lines at the bow, stern, and amidships to avoid concentrated load on a single line due to slight vessel drift (e.g., current push). Use visual inspection (whether the line is straight) and light tapping (a tight line produces a clear sound, a loose one a dull sound) to assess tension uniformity.
2. **Reduce Localized Wear**: Focus on contact points between the line and chocks or bollards. Even in calm waters, slight vessel movement causes "micro-friction." Wrap contact areas with 3-5cm thick wear-resistant rubber pads or apply specialized anti-wear grease (compatible with the line material, e.g., ester-based grease for polyester lines) to prevent outer strands from fraying.
3. **Environmental Protection**: For long-term mooring in calm waters (e.g., >72 hours), avoid direct sunlight exposure (especially in summer) by setting up awnings or rinsing the lines with fresh water every 24 hours (in saltwater environments) to prevent accelerated aging. Never place lines on sharp deck components (e.g., bolts, angle steel) to avoid localized compression deformation.

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## 2. Windy/Wavy Waters (Sea State 3-5: Wave Height 1.25-4m, Wind Speed 5.5-13.8m/s)
In windy/wavy waters, vessels experience **periodic rolling and pitching**, subjecting eight-strand mooring lines to "dynamic alternating loads." Risks escalate to overload and shock. Key precautions include:

1. **Dynamic Load Control**: Vessel rolling causes cyclic "stretching-slacking" of mooring lines. Reserve 5%-8% extra line length (compared to calm waters) to avoid shock loads from sudden tensioning during rolling. If multiple lines are used (e.g., 2 at bow, 2 at stern), ensure consistent elasticity coefficients (using same batch/specification lines) to prevent uneven load distribution.
2. **Increase Inspection Frequency**: Shorten inspection intervals to 1-2 hours. Focus on localized stretching deformation (e.g., narrowed diameter) and loose connections (e.g., gaps at thimble joints). If 1-2 outer strands break, replace the line immediately—do not continue use (risk of increases exponentially over time in rough seas).
3. **Personnel Safety**: During inspections, wear life jackets, non-slip shoes, and safety harnesses (attached to fixed points on the vessel). Never stand in the "line of tension" (extension of the line between endpoints) to avoid injury from sudden snap-back. Adjust line tension with two personnel: one operating the winch (or manual adjustment), another monitoring the line to prevent accidents due to sudden movements.
4. **Buffering Measures**: Install elastic buffers (e.g., rubber pads, spring dampers) between lines and bollards, or use "parallel double lines" (two identical lines side-by-side) to distribute dynamic shock loads and reduce peak stress on single lines. Never attach lines directly to unbuffered metal components to avoid from shock loads.

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## 3. Strong Storms/Swells (Sea State 6+: Wave Height ≥4m, Wind Speed ≥13.8m/s)
In strong storms/swells, vessels experience **violent rolling and heaving**, subjecting eight-strand mooring lines to "extreme shock loads," with risks of line and vessel drift. Emergency protections and reinforcements are critical. Key precautions include:

1. **Emergency Reinforcement & Load Limitation**: Immediately deploy backup mooring lines, increasing the number of lines by 50% (e.g., from 4 to 6). Use "cross-mooring" (bow and stern lines fixed at 45° angles) to enhance anti-sway capacity. Strictly avoid exceeding 80% of the line’s rated tensile strength (dynamic load factors can reach 1.8-2.2x in storms—leave sufficient safety margin). Monitor loads in real-time with tension sensors; if nearing limits, adjust vessel position (e.g., with tug assistance).
2. **Enhanced Line Protection**: Replace fixed chocks with "roller chocks" at all turning points (e.g., fairleads) to convert "sliding friction" to "rolling friction," reducing wear from violent rubbing. Cover high-risk areas (e.g., knots, 1m near joints) with high-strength wear sleeves (e.g., nylon sleeves ≥1.5m long) to prevent localized.
3. **Emergency Preparedness & Evacuation**: Pre-position backup lines (same specifications), cutting tools (e.g., hydraulic cutters), and life-saving equipment near the mooring area. If severe stretching (e.g., >10% elongation) or multiple strand breaks occur, activate emergency protocols: cut the damaged line (to avoid cascading failures) and replace it quickly. When winds exceed 17.2m/s (Beaufort 8) or waves exceed 5m, prohibit deck operations; evacuate all personnel to safe interior areas and monitor lines remotely (e.g., via deck cameras).
4. **Post-Storm Inspection & Discarding**: After a storm, even if lines appear undamaged, conduct comprehensive tests: use tension sensors to check residual strength (discard if strength loss >20%), and inspect internal strands for hidden damage (e.g., compression deformation, fiber breaks). If lines experienced overload shocks (per tension sensors), discard them regardless of appearance—never reuse in rough seas.

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## 4. Special Conditions: Icy and Foggy Waters
### (1) Icy Waters (With Floating Ice, Temperature ≤0°C)
- **Anti-Freezing & Brittleness Prevention**: Eight-strand lines (especially synthetic fibers) become brittle in cold. Apply "anti-freeze lubricant" (e.g., low-temperature silicone grease) to prevent icing-induced stiffness and bending. If lines are frozen, never use open flames (risks melting)—thaw slowly with warm water (30-40°C), then dry before use.
- **Floating Ice Impact Protection**: Install "anti-ice sleeves" (e.g., steel sleeves, 1-2m long) on submerged sections to avoid damage from ice impact. Regularly clear floating ice around lines to prevent accumulation and uneven loading.

### (2) Foggy Waters (Visibility <1000m)
- **Marking & Warning**: Tie reflective tapes at visible intervals (every 5m) on lines and activate warning lights (red flashing lights) in mooring areas to prevent collisions by other vessels (e.g., harbor tugs) in low visibility.
- **Enhanced Communication**: Inspectors must carry radios for real-time communication with the bridge, clearly reporting line status (e.g., "Bow Line #1 tension normal," "Stern Line #2 no"). Avoid adjusting line tension in heavy fog; if necessary, require2 vessels for lookout support.

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## Conclusion
When using eight-strand mooring lines in different sea conditions, the core principle is **"adapt strategies to sea conditions"**—focus on maintenance in calm waters, dynamic control in windy/wavy waters, and emergency reinforcement in storms, while implementing tailored protections for special conditions (e.g., cold, low visibility). This approach maximizes mooring safety and extends line service life.