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 core should be worked in with the splice and not cut out.
IMCA publishes guidance on the manufacture and safe use of cable-laid slings and grommets
Items 5 to 9 may be illustrated in a sketch. Each cable laid sling should also be marked with a longitudinal line to show its alignment when originally ica see paragraph 2. A thorough examination should be carried out: For core unit ropes also seven strands can be used. These are generally too large for k test equipment to be used to test the rope sample to destruction.
The length of the circumference should be at least five times the cable lay length. The bending factor EB shall be calculated according to the formula: Generally, imc 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 method of splicing must be mentioned on the consolidation test certificate see Appendix 2. Guidance document on t Bending factor for the bend of a grommet at its ends or when used as a doubled grommet at the grommet body.
Consolidation certificate number Sling number Customer Measured length L? Guidance of Solder Pas For a grommet, the core butt position and the tuck position should be 1779 by red paint see paragraph 5. This core butt and tuck position should be clearly marked by red paint and should be positioned at approximately 0.
Guidance on the manufacture and safe use of cable-laid slings and grommets
Members are self-regulating through the adoption of IMCA guidelines as appropriate. Appendix 5 gives guidance on the assessment of the condition of the sling or grommet and on discard. 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.
The following certificates should be issued for each sling or grommet and should be available to all interested parties on request: This is calculated as follows: 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. A certificate of examination see Appendix 4 should be renewed after each thorough examination.
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 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.
The grommet must never be bent at this marked position. 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.
An inspection or thorough examination is carried out to identify damage or deterioration which affects fitness for use, such as: Under no circumstances should the grommet contact any surface where 17 radius is less than 0. 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.
This certificate is valid for imcx maximum of six months or such lesser period as stated. WLL will thus be: 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. For and on behalf of: The original working group membership for PM20 was as follows: CSBL f is as defined in paragraph 3.
IMCA M Guidance on The Use of Cable Laid Slings and Grommets _百度文库
Although the cross section of k 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 note, therefore, gives advice on their construction, rating, testing, certification, examination and use.
The 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.
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 diameter.
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. 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.
Significant distortion of the rope The sling should be discarded when distortion due to kinking, crushing, core collapse or knotting is identified. For these purposes this is taken as 9. Under no circumstances should the sling body contact any surface where the radius is less than 0.
Damaged or defective terminations Particular attention should be paid to signs of: K factors for the various classes are: Dimension w should be in accordance with Table 1 with h at least 2w. Sketches can be enclosed They commit to act as responsible members by following relevant guidelines and being willing to be audited against compliance with them by their clients.
All tucks should be over one and under two.