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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Under no circumstances should the grommet contact any surface where the radius is less than 0.
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 the lay. The sixth tuck can be made with one half of the strands from the outer unit ropes. 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 competent person.
This is calculated as follows: Dimension w should be in accordance with Table 1 with h at least 2w. The length of tails of outer ropes after the last tuck should be at least three times the diameter of the cable laid rope and the tails should be seized to the main body of the sling.
The method of splicing must be mentioned on the consolidation test certificate see Appendix 2. 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where it is difficult to distinguish between detrimental distortion and acceptable deformation, the sling should be withdrawn from service and referred to an independent competent person for opinion or thorough examination.
The length of the circumference should be at least five times the cable lay length.
IMCA publishes guidance on the manufacture and safe use of cable-laid slings and grommets
The record of lifts should be kept together with the certificates and made available on demand to the independent competent person and to the statutory authorities. 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.
The core should be worked in with the splice and not cut out. The difference in circumferential length between grommets of matched pairs should not exceed 1.
Such operations often use cable laid slings and grommets of mm diameter and over, as developed for use in the offshore oil industry. The following certificates should be issued for each sling or grommet and should be available to all interested parties on request: The grommet must never imcca bent at this marked position. A grommet contains one tuck splice diametrically opposite the core butt position.
IMCA M Guidance on The Use of Cable Laid Slings and Grommets _百度文库
For these purposes this is taken as 9. A thorough examination should be carried icma Members are self-regulating through the adoption of IMCA guidelines as appropriate. The original ijca group membership for PM20 was as follows: All tucks should be over one and under two. 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.
Guidance on the manufacture and safe use of cable-laid slings and grommets – IMCA
Guidance of Solder Pas Each cable laid sling should also be marked with a longitudinal line to show its n when originally measured see paragraph 2. A certificate of examination see Appendix 4 should be renewed after each thorough examination. Dimension h should be at least 2w.
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.
IMCA promotes improvements in quality, health, safety, environmental and technical standards through the publication of information notes, codes of practice and by other appropriate means. 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 imda.
There are two core activities that relate to all members: Items 5 to 9 may be illustrated in a sketch. In addition, the actual length of the sling is critical if it is used as part of a matched set. iimca
Guidance on the manufacture and safe use of cable-laid slings and grommets
For a grommet, the core butt position and the tuck position should be marked by red paint see paragraph 5. The difference in length between slings of matched pairs should not exceed 0.
Bending factor for the bend of a grommet at its ends or when used as a doubled grommet at the grommet body.
The minimum remaining undistorted sling length between the splices of both sling imcaa shall, in all cases, be at least 15d, where d is the nominal diameter of the cable laid rope forming the sling. All unit ropes should have a steel core.
Lay Factors For core unit and outer unit ropes: For core unit ropes also seven strands can be used.