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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A certificate of examination see Appendix 4 should be renewed after each thorough examination.
IMCA M Guidance on The Use of Cable Laid Slings and Grommets _百度文库
For core unit ropes also seven strands can be used. 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 imva. 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.
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. The bending factor EB shall be calculated according to the formula: The method of splicing must be mentioned on the consolidation test certificate see Appendix 2.
Appendix 5 gives guidance on the assessment of the condition of the sling or grommet and on discard. Compacted or deformed unit ropes are not allowed toused. 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.
The actual unit rope breaking load should be equal to or greater than the calculated breaking load in accordance with 1799 2. Under no circumstances should the sling body contact any surface where the radius is less than 0.
IMCA publishes guidance on the manufacture and safe use of cable-laid slings and grommets – IMCA
For a grommet, the core butt position and the tuck position should be marked by red paint see paragraph 5. 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 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.
Consolidation certificate number Sling number Customer Measured length L? Sketches can be enclosed Damaged or defective terminations Particular attention should be paid to signs of: The minimum remaining undistorted sling length between the splices of both sling ends shall, in all cases, be at least 15d, where d is the nominal diameter of the cable laid rope forming the sling.
Dimension h should be at least 2w. In addition, the actual length of the sling is critical if it is used as part of a matched set. Competent person Designated person, suitably trained, qualified by knowledge and practical experience, and in possession of the necessary instructions to enable the required calculation of WLL and examination to be carried out. The lay length of the cable laid rope should be a minimum of six times ikca a maximum of seven-and-ahalf times its nominal diameter.
This certificate is valid for a maximum of six months or such lesser period as stated.
All tucks should be over one and under two. Each cable laid sling should also be marked with a longitudinal line to show its alignment when originally measured see paragraph 2.
The difference in circumferential length between grommets of matched pairs should not exceed 1. Significant distortion of the rope The sling should be discarded when distortion due to kinking, crushing, core collapse or knotting is identified.
Guidance on the manufacture and safe use of cable-laid slings and grommets
The breaking load of unit ropes up to 60mm diameter should be calculated in accordance with the method given in Imda and for larger ropes EN will be applicable see Appendix 1 for method of calculation. 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.
Localised breaks If 17 are three or more broken wires closely grouped, the effect on the sling or grommet should be assessed by an independent competent person. Items 5 to 9 may be illustrated in a sketch. All unit ropes should have a steel core. 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 imcca mechanical or corrosive damage.
The sixth tuck can be made with one half imcz the strands from the outer unit ropes. Guidance document on t For these purposes this is taken as 9.
IMCA publishes guidance on the manufacture and safe use of cable-laid slings and grommets
A grommet contains one tuck splice diametrically opposite the core butt position. Items 5 to 13 may be illustrated in a sketch. Diameter of cable laid 19 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. For and on behalf of: