High Strength PP Danline Double Twisted 8 Strands Polypropylene Rope 8S for Fishing Mooring Marine

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

Eight-strand Mooring Rope Usage and Precautions
Eight-strand mooring ropes are widely used in marine applications and offshore engineering due to their high strength and fatigue resistance. Proper usage and strict precautions are key to ensuring their optimal performance and safe operation.

 I. Usage
### (I) Preliminary Preparation: Rope Inspection and Environmental Adaptation
1. **Rope Condition Inspection**: Before use, thoroughly inspect the appearance and structure of the eight-strand mooring rope to ensure there is no obvious wear (e.g., broken outer strands, linting exceeding 1/3 of a single strand diameter), corrosion (especially aging and hardening of synthetic fiber ropes), localized extrusion deformation, or loose joints. Also, verify that the rope specifications (e.g., diameter, rated tensile strength) match the actual load requirements to avoid overload breakage caused by using a small rope to pull a heavy load. 2. **Environment and Tool Compatibility**: Select the appropriate tools based on the intended use scenario. For example, when mooring a ship, ensure that the bollard and fairlead sizes match the rope diameter to avoid compression and wear on the rope due to undersized holes. If using the tool in salt spray environments at sea, clean any rust and sharp protrusions on the tool surface beforehand to prevent scratches on the rope.

### (II) Core Operations: Mooring and Securing Steps

Using mooring at a dock as an example, the standard operating procedure is as follows:
1. **Rope End Securing**: Secure one end of the eight-strand mooring rope to the ship's mooring bollard using an easily removable and secure knot, such as a "double hitch" or "clove knot." Tighten the knot until it is tight and prevents it from slipping under load. If the rope end has a metal connector (such as a ferrule), check the strength of the connector to the rope to prevent it from falling off.
2. **Slow Rope Payout and Force Adjustment**: A dedicated person should control the rope payout speed to avoid rapid pulling, which can cause friction and heat generation between the rope and the ground or the fairlead (especially for synthetic fiber ropes, where high temperatures can easily reduce strength). After the rope is initially straightened, the tension should be adjusted according to the vessel's draft and tidal fluctuations to ensure even tension on each strand (this can be determined by observing the rope for local tension or bending) and to avoid overloading a single strand.
3. **Multiple Rope Coordinated Securing**: If a vessel requires multiple eight-strand mooring ropes (e.g., 2-3 each at the bow and stern), ensure balanced tension on each rope and maintain an angle between adjacent ropes between 30° and 60° to prevent concentrated force from overloading and breaking a single rope.
4. **Finishing and Marking**: After securing, neatly coil the excess rope on a rope rack to avoid kinks and twists. Mark the rope with the date of use and load rating in a conspicuous location for easy traceability and maintenance. ### (III) Post-Processing: Storage and Maintenance
1. **Clean and Dry**: After use, promptly clean the rope surface of any mud, sand, or salt stains (especially in seawater environments). Synthetic fiber ropes can be rinsed with fresh water, while natural fiber ropes (such as linen, which are rarely used for eight-strand mooring) should be kept away from prolonged soaking. After cleaning, hang the rope in a well-ventilated, dark place to dry to prevent moisture-induced mold and direct ultraviolet radiation that accelerates aging.
2. **Proper Storage**: After drying, coil the eight-strand mooring rope into a ring with a diameter approximately 20-30 times the rope diameter. Avoid excessive bending (the minimum bend radius should be no less than 8 times the rope diameter) to prevent internal strands from being squeezed and deformed. Store away from oil, dirt, and chemicals (such as diesel, strong acids, and alkalis) to prevent corrosion of the rope material.

 II. Precautions
### (I) Safe Operation: Avoid Risks to Personnel and Equipment
1. **Do Not Overload**: Strictly adhere to the rated tensile strength of the eight-strand mooring rope (usually indicated on the rope or product manual). Do not exceed the rated load by more than 10%. This is especially true in dynamic load scenarios (such as wind resistance and towing operations). Consider the "dynamic load factor" (generally 1.2-1.5 times the static load) caused by impact forces and allow for a safety margin.
2. **Stay Away from Dangerous Areas**: During operation, do not stand on the "load extension" of the rope to prevent rebound and injury if the rope breaks. If crossing the rope, do so through the slack section and avoid stepping on the rope while it is taut (which may cause rope abrasion or slipping). 3. **Avoid high temperatures and open flames**: Synthetic fiber eight-strand mooring ropes (such as polyester and polyethylene) have a low melting point (approximately 200-260°C). Keep them away from welding sparks and high-temperature areas like exhaust pipes. Do not heat the wet rope with open flames to prevent melting and a sudden drop in strength.

### (II) Rope Protection: Extending Service Life
1. **Reducing Friction Damage**: Wrap the rope with wear-resistant rubber pads or use rope supports where it contacts the fairleads and mooring posts to prevent breakage of the outer strands due to hard friction. Do not drag the rope over sharp objects (such as steel plate edges or unpolished bolts). If you need to change the direction of force, ensure the radius of curvature at the turning point is sufficiently large (no less than 10 times the rope diameter). 2. **Avoid prolonged exposure to sunlight and immersion**: For extended outdoor use, apply a special UV protectant to the rope surface (it must be compatible with the rope material, such as an ester-based protectant for polyester ropes). Avoid prolonged immersion in water (especially seawater). Even for corrosion-resistant materials, prolonged immersion can cause internal strands to stick together and weaken.
3. **No Modifications**: Do not cut, weld, or replace joints without authorization. If rope ends are severely worn and require repair, professionally perform a "braiding" method (the braiding length must be no less than 20 times the rope diameter). Temporary treatments such as wire tying or tape wrapping are prohibited to prevent joints from breaking under stress.

 (III) Regular Maintenance: Promptly Identify Potential Hazards
1. **Daily Inspection**: Record the condition of the rope before and after each use, focusing on areas prone to wear (such as the contact area with the fairlead and the knot). For ropes that have been unused for an extended period, perform a comprehensive inspection every three months to check for mold, insect damage (for natural fiber ropes), or material deterioration. 2. **Lifespan Management**: Eight-strand mooring ropes typically have a service life of 3-5 years (depending on frequency of use and environment). Even if there is no visible damage, if the rope exceeds this lifespan or experiences an overload (e.g., permanent elongation exceeding 5%), it must be discarded and prohibited from further use.

By standardizing usage and strictly adhering to precautions, you can maximize the performance advantages of eight-strand mooring ropes, minimize safety risks, and extend the lifespan of the rope.