Pinards PDF

AB. The International Marine Contractors Association. Guidance on. The Use of Cable Laid Slings and Grommets. IMCA M August AB The International Marine Contractors Association Guidance on The Use of Cable Laid Slings and Grommets IMCA M Franklin Grommet Slings. CGBL. Sling Diameter / mm. Reference: IMCA M Table Reference: MCLT/01 Rev Franklin Cable Laid Grommet Table.

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In cases where it is difficult to distinguish between detrimental distortion and acceptable deformation, the sling should be withdrawn from service and referred to an independent competent person for opinion or thorough examination.

Damaged or defective terminations Particular attention should be paid to signs of: The sling should be withdrawn from service and referred to an independent competent person for thorough examination, where pitting, arcing or marked discoloration due to overheating are identified.

Consolidation certificate number Sling number Customer Measured length L? For and on behalf of: Although the cross section of the grommet comprises a total of 14 ropes, the core section of the unit rope should be discounted in the calculation of the breaking load because the joint is butted and not spliced.

The eyes of imfa sling leg should be formed by the use of hand splices made in one of the following ways, or by another method which can be demonstrated to be as efficient. For a grommet, the core butt position and the tuck position should be marked by red paint see paragraph 5.

In addition, the actual length of the sling is critical if it is used as part of a matched set. The length of tails of outer ropes after the last tuck should ica at least three times the diameter of the cable laid rope and the tails should be seized to the main body of the sling.

Significant distortion of the rope The sling should be discarded when distortion due to kinking, crushing, core collapse or knotting is identified.

IMCA publishes guidance on the manufacture and safe use of cable-laid slings and grommets

There are two core activities that relate to all members: Lay Factors For core unit and outer unit ropes: Diameter of cable laid rope Pin diameter mm mm mm mm Table 2 — Pin Diameters mm mm mm mm If measurement under conditions different from the above is required, the customer should state the requirements on the order and the details should be shown on the certificate of dimensional conformity Appendix 3B.

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The method of splicing must be mentioned on the consolidation test certificate see Appendix 2. The following certificates should be issued for each sling or grommet and should be available to all interested parties on request: The length of the circumference should be at least five times the cable lay length.

Generally, the loss of strength caused by the mechanical or corrosive action on the rope as a whole is more critical than the loss in strength resulting from the actual wire breaks. The difference in circumferential length between grommets of matched pairs should not exceed 1. A grommet contains one tuck splice diametrically opposite the core butt position. Items 5 to 13 may be illustrated in a sketch.

Guidance on the manufacture and safe use of cable-laid slings and grommets – IMCA

IMCA promotes improvements in quality, health, safety, environmental and technical standards through omca publication of information notes, codes of practice and by other appropriate means. Diameter of cable laid rope Pin diameter mm mm mm mm Table 1 — Pin Diameters mm mm mm mm If measurement under conditions different from the above is required, the customer should state the requirements on the order and the details should be shown on the Certificate of Dimensional Conformity Appendix 3A.

Imcca competent person should consider measuring the actual length of the sling or grommet and the length of the splice tails, as this can give an important indication of serious deterioration. Under no circumstances should the grommet contact any surface where the radius is less than 0. Such operations often use cable laid slings and grommets of mm diameter and over, as developed for use in the offshore oil industry.

For these purposes, this is taken as 9. The guidance was originally prepared by a working group of experts in and was intended to be mainly of assistance to those concerned with the use of cable laid slings and grommets in very heavy lifting operations.

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The breaking load of unit ropes up to 60mm diameter should be calculated in accordance with the method given in ISO and for larger ropes EN will be applicable see Appendix 1 for method of calculation.

Under no circumstances should the sling body contact any surface where the radius is less than 0. The lay length of the cable laid rope should be a minimum of six times and a maximum of seven-and-ahalf times its nominal diameter. For core unit ropes also seven strands can be used. The sixth tuck can be made with one half immca the strands from the outer unit ropes.

The core unit rope should be right or left hand ordinary lay; The outer unit ropes should be right or left hand ordinary lay; The cable laid ropes should be laid right or left hand. This note, therefore, gives advice on their construction, rating, testing, certification, examination and use.

The original working group membership for PM20 was as follows: For these purposes this is taken as 9. I, the undersigned, thoroughly examined the above and certify that they showed no apparent defects or damage which could affect the strength or safe use.

Guidance on the manufacture and safe use of cable-laid slings and grommets

Localised breaks If there are three or more broken wires closely grouped, the effect on the sling or grommet should be assessed by an independent imc person. Each cable iimca sling should also be marked with a longitudinal line to show its alignment when originally measured see paragraph 2. WLL will thus be: The core should be worked in with the splice and not cut out. Corrosion The sling should be withdrawn from service and referred to an independent competent person for thorough examination where corrosion detrimental to the strength of the sling is suspected.