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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This certificate is valid for a maximum of six months or such lesser period as stated. Lay Factors For core unit and outer unit ropes: The actual unit rope breaking load should be equal to or greater than the calculated breaking load in accordance with paragraphs 2. 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 ima be shown on the Certificate of Dimensional Conformity Appendix 3A.
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. Bending factor for the bend of a grommet at its ends or when used as a doubled grommet at the grommet body.
A certificate of examination see Appendix 4 should be renewed after each thorough examination.
IMCA publishes guidance on the manufacture and safe use of cable-laid slings and grommets
The difference in length between slings of matched pairs should not exceed 0. 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.
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 guidance was originally prepared by a jmca 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.
Guidance on the manufacture and safe use of cable-laid slings and grommets
All tucks should be over one and under two. The following ima should be issued for each sling or grommet and should be available to all interested parties on request: For core unit ropes also seven strands can be used. 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. 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 available in PM For 719 purposes this is taken as 9.
IMCA M Guidance on The Use of Cable Laid Slings and Grommets _百度文库
The core should be worked jmca with the splice and not cut out. Such operations often use cable laid slings and grommets of mm diameter and over, as developed for use in the offshore oil industry. The length of the circumference should be at least five times the cable lay length.
Consolidation certificate number Sling number Customer Measured length L?
Each cable laid sling should also be marked with a longitudinal line to show its alignment when originally measured see paragraph 2. 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.
Items 5 to 13 may be illustrated in a sketch. 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 sixth tuck can be k with one half of the strands from the outer unit ropes.
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 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.
All unit ropes should have a steel core. Guidance document on t This is calculated as follows: The length of tails of outer ropes after the last tuck should be at least imcx times the diameter of the cable laid rope and the tails should be seized to the main body of the sling.
A grommet contains one tuck splice diametrically opposite the core butt position. For these purposes, this is taken as 9.
For and iimca behalf 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.
Appendix 5 gives guidance on the assessment of the condition of the sling or grommet and on discard. This note, therefore, gives advice on their construction, rating, testing, certification, examination and use. A thorough examination should be carried out: Damage due to weld arcing, etc.
Guidance on the manufacture and safe use of cable-laid slings and grommets – IMCA
In addition, the actual length of the sling is critical if it is used as part of a matched set. Members are self-regulating through the adoption of IMCA guidelines as appropriate. The grommet must never be bent at this marked position. 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.
Sketches can be enclosed