6.4.3 The rope may be subject to cyclic loading forbedding purposes prior to testing. The rope is to be tested ata suitable strain rate in accordance with a recognised Nationalor International Standard.

6.4.4 The load is to be applied until one wire break iswitnessed or 130 per cent of the minimum breaking load isrecorded. The maximum recorded load is to be reported bythe manufacturer.

6.4.5 Tests in which a breakage occurs adjacent to andas a result of damage from the grips are to be rejected, if theapplied load is less than the specified minimum requirement.The rope is to be retested to withstand the agreed minimumbreaking load.

6.4.6 With the exception of offshore mooring ropes,consideration may be given to determining the breaking loadby summation or aggregating actual test results on individualwires, if facilities are not available for undertaking a breakingtest on a production basis. A suitable spin factor or lay-updeduction allowance in accordance with a recognisedNational or International Standard for the applicable ropediameter, designated grade and construction is to be applied.

6.4.7 Where spin factors or lay-up deduction allowancesare proposed by the manufacturer, a report on suitable cyclicload testing of prototype ropes of the same construction,strength and diameter is to be approved by LR. In addition,the manufacturer is to show that a satisfactory breaking loadtest has been carried out in the previous two years, andwitnessed by LR for the same rope construction, diameterand designated grade.

6.4.8 LR may give special consideration to spin factorsor lay deductions based on data extrapolated from smaller diameter ropes of the same construction, provided that theseropes have been tested in accordance with 6.4.7.

6.4.9 All data arising from smaller diameter ropes for theextrapolation in 6.4.8 are to have been derived from testscarried out within two years of the manufacture of the largerdiameter rope.

6.4.10 The finished rope is to have no more than one wireconnecting weld in any length of 18d, where d is the diameterof the rope.

6.5 Inspection

6.5.1 A report on dimensional and visual examination isto be presented to the Surveyor by the manufacturer. Thedimensions and discard criteria are to comply with an agreedNational or International Standard.

6.5.2 Visual and dimensional checks are to be carried outin the presence of the Surveyor.

6.6 Identification

6.6.1 All completed ropes are to be identified withattached labels detailing the rope type, diameter and length.

6.7 Certification

6.7.1 A manufacturers certificate, in accordance withCh1,3.1.3(c), is to be issued. The certificate is to be validatedby the manufacturers representative, who is to be indepen-dent of the production process and LR.

6.7.2 Each test certificate is to contain the followingparticulars: Purchasers name and order number. Details of the rope construction. Core material. Grade of zinc coating. Mechanical test results. Adhesion test results. Dimensions. Method of breaking load testing. Breaking load.

Section 7Fibre ropes

7.1 Manufacture

7.1.1 Fibre ropes intended as mooring lines may bemade of coir, hemp, manila or sisal, or may be composed ofsynthetic (man-made) fibres. They may be three-strand(hawser laid), four-strand (shroud laid) or nine-strand (cablelaid), but other constructions will be specially considered.

7.1.2 Each length of rope is to be manufactured from suitable material of good and consistent quality. Rope materials should, in general, comply with a recognisedNational Standard.

7.1.3 Synthetic fibre ropes are to be suitable for thepurpose intended and should comply with a recognised standard.

7.1.4 Weighting and loading matter is not to be added,and any lubricant is to be kept to a minimum. Any rot-proofingor water repellancy treatment is not to be deleterious to thefibre nor is it to add to the weight or reduce the strength ofthe rope.

7.2 Tests of completed ropes

7.2.1 The breaking load is to be determined by testing todestruction a sample cut from the completed rope.

7.2.2 The minimum test length and the initial test load areto be as given in Table 10.7.1. After application of the initialload, the diameter and evenness of lay up of the sample are tobe checked. The sample is then to be uniformly strained atthe rate given in Table 10.7.1 until it breaks.

7.2.3 The actual breaking load is to be not less than thatgiven in an appropriate National Standard.

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7.2.4 If the sample is held by grips and the break occurswithin 150 mm of the grips, the test may be repeated, but notmore than two tests may be made on any one coil.

7.2.5 Where difficulty is experienced in testing a sampleof a completed synthetic fibre rope, LR will consider alternativemethods of testing.

7.3 Identification

7.3.1 Each coil of rope is to be identified with an attachedlabel detailing the material, construction, diameter and length.

7.4 Certification

7.4.1 A manufacturers certificate, in accordance withCh1,3.1.3(c), is to be issued. The certificate is to be validatedby the manufacturers representative, who is to be indepen-dent of the production process and LR.

7.4.2 Each test certificate is to include the followingparticulars: Manufacturers name. Purchasers name and order number. Rope type. Dimensions. Test length. Rate of straining. Breaking load.

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Test length Initial loadRate of straining

Material mm %mm/min

minimum (see Note)

Natural fibre 1800 2 150 50

Synthetic fibre 900 1 100 max.

NOTEPercentage of specified minimum breaking load.

Table 10.7.1 Breaking load test