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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The difference in circumferential length between grommets of matched pairs should not exceed 1. Compacted or deformed unit ropes are not allowed to be used.
For these purposes this is taken as 9. This core butt and tuck position should be clearly marked by red paint and should be positioned at approximately 0. Guidance document on t Items 5 imva 13 may be illustrated in a sketch. This note, therefore, gives advice on their imcca, rating, testing, certification, examination and use. The appearance of a few well distributed broken wires may have no marked effect on the strength of the sling, but it might be indicative of mechanical or corrosive damage.
IMCA publishes guidance on the manufacture and safe use of cable-laid slings and grommets
The original working group membership for PM20 was as follows: 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.
Unless specified otherwise, when measuring actual grommet lengths, if pins are used, the pin diameter should be as per Table 2. The length of the circumference should be at least five times the cable lay length. The actual unit rope breaking load should be equal to or greater than the calculated breaking load in accordance with paragraphs 2.
Guidance on the manufacture and safe use of cable-laid slings and grommets
Significant distortion of the rope The sling should be discarded when distortion due to kinking, crushing, core collapse or knotting n identified. 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. For and on behalf of: A certificate of examination see Appendix 4 should be renewed after each thorough examination. The difference in length between slings of matched pairs should not exceed 0.
The eyes of a 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. Members are self-regulating through the adoption of IMCA guidelines as appropriate.
IMCA M Guidance on The Use of Cable Laid Slings and Grommets _百度文库
Dimension h should be at least 2w. HSE has advised that, although it no longer issues this type of guidance, it would not be adverse to operational practices which followed the guidelines formerly imcca in PM These are generally too large for existing test equipment to be used to test the rope sample to destruction.
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.
These tucks should be over and under against the lay of the rope, except that the first tuck only of any one unit rope may be with mm lay.
The following certificates should be issued for each sling or grommet and should be available to all interested parties on request: If the sling body is to be doubled then this minimum length must be agreed by the interested parties, but should not be less than 15d. For these applications, f is taken as not less than 2. For a grommet, the core butt position and the tuck position should be marked by red paint see paragraph 5.
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.
The core should be worked in with the splice and not cut out. WLL will thus be: Consolidation 719 number Sling number Customer Measured length L?
Guidance on the manufacture and safe use of cable-laid slings and grommets – IMCA
The method of splicing must be mentioned on the consolidation test certificate see Appendix 2. For these purposes, this is taken as 9. CSBL f is as defined in paragraph 3.
They commit to act as responsible members by following relevant guidelines and being willing to be audited against compliance with them by their clients. Sketches can be enclosed All tucks should be over one and under two. This is calculated as follows: This bending factor will also be applicable for the bend of the sling eye, although this will often not be governing as the sling load will be divided over the two legs of the eye.
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.
A thorough examination should be carried out: Cable laid ropes should be manufactured right or left hand lay in accordance with one of the combinations of unit rope constructions and cable lay factors, as specified in Appendix 6.
Lay Factors For core unit and outer unit ropes: The sixth tuck can be made with one half of the strands from the outer unit ropes. Under no circumstances should the sling body contact any surface where the radius is imcs than 0.
A grommet contains one tuck splice diametrically opposite the core butt position. Dimension w should be in accordance with Table 1 with h at least 2w. 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. Imxa operations often use cable laid slings and grommets of mm diameter and over, as developed for use in the offshore oil industry.