Page 20 - MARINE ROPES CATALOGUE - LANCELIN

FINISHINGS FOR LINES

Because of the complexity of modern materials, a knot Here are some examples:
reduces the tensile resistance of lines to a significant extent. Knot
Aramids and LCPs (liquid crystal polymers) are hard fibres 30 to 50% minimum of the load
with poor resistance to small curve radii. at breaking
Dyneema is a smooth material and may be slippery.
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Splice
70 to 50% minimum of the load
Therefore, the way a line is finished is very important. at breaking
It can make the resistance of the line between 30 and 100%
of its linear resistance. Professional splice
90% minimum of the load
at breaking

Linear break
100% minimum of the load
at breaking

Example of a DYNEEMA splice:
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L 1 S 1

Professional splicing is recommended. It is advisable to follow the geometric system illustrated below:
Several points should be taken into consideration: 1 L 1 S 1
• THE COVERING: in order to increase the interactions at 2 L 1 S 1
Rope axis
the splicing point, it is recommended to use a polyurethane S 1
1 L 1
coated Dyneema . 1
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Rope axis d 2 1
ROPE
• COMMON LENGTH USED IN THE SPLICE: to ensure Rope axis D PIN 2
maximum effectiveness, a minimum length of 80 to 100 Rope axis 2
d ROPE
times the diameter must be included in the splice. L D PIN d ROPE
PIN
• TAPERING : the Dyneema incorporated in the splice EYE D d ROPE D PIN
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General rules:
needs to be gradually tapered over a proportional length L EYE L EYE
of 20 to 25% of the length involved in the splice. General rules 1: PIN General rules: L EYE
• S = D
•
/ 4;
*
< 15°;
=
1
2
General rules:
;
• D PIN / d ROPE > 2; • 1 = 2 • L + S 1 • 5 * D PIN < 15°; 1 1 = 2 < 15°; / 4; • S = D PIN • S 1 = D PIN * / 4;
• • S = D
< 15°;
*
*
=
/ 4;
PIN
1
1
1
2
• L > 2;
• D PIN / d ROPE > 2;
> 2;
• D
• L EYE / D PIN > 5; • D PIN / d ROPE EYE = L + S / d • L + S 1 5 * D PIN ; • L + S 1 • L 1 + S 1 PIN ; 5 * D PIN ;
5 * D
ROPE 1
1
1
1
PIN
• L EYE / D PIN > 5;
• L
> 5; = L + S
• L = D PIN / (2 * SIN ); EYE / D PIN > 5; • L EYE / D • L EYE 1 1 • L EYE = L + S 1
• L EYE = L 1 + S 1
PIN
1
1
1
• L 1 = D PIN / (2 * SIN );
• L = D
• L = D PIN / (2 * SIN ); 1 PIN / (2 * SIN ); 1
1
1
1
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