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.
|Published (Last):||11 May 2015|
|PDF File Size:||10.66 Mb|
|ePub File Size:||5.81 Mb|
|Price:||Free* [*Free Regsitration Required]|
The eyes of a sling leg should be formed by the use of hand splices made in one of theways, or by another method which can be imc to be as efficient. This note, therefore, gives advice on their construction, rating, testing, certification, examination and use. For core unit ropes also seven strands can be used. In addition, the actual length of the sling is critical if it is used as part of a matched set.
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. 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
The difference in circumferential length between grommets of matched pairs should not exceed 1. This core butt and tuck position should be clearly marked by red paint and should be positioned at approximately 0.
Dimension w should be in accordance with Table 1 with h at least 2w. Consolidation certificate number Sling number Customer Measured length L? Imva cable laid sling imcw also be marked with a longitudinal line to show its alignment when originally measured see paragraph 2. For these applications, f is taken as not less than 2. The actual unit rope breaking load should be equal to or greater than the calculated breaking load in accordance with paragraphs 2.
IMCA publishes guidance on the manufacture and safe use of cable-laid slings and grommets
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.
Sketches can be enclosed The sling should be withdrawn from service and referred to an independent competent person for thorough examination, where pitting, arcing or marked discoloration due to overheating are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. 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.
These are generally too large for existing test equipment to be used to test the rope sample to destruction. A grommet contains one tuck splice diametrically opposite the core butt position. Bending factor for the bend of a grommet at its ends or when used as a doubled grommet at the grommet body.
Items 5 to 13 may be illustrated in a sketch.
Significant distortion of the rope The sling should be discarded when distortion due to kinking, crushing, core collapse imcz knotting is identified.
A certificate of examination see Appendix 4 should be renewed after each thorough examination. Unless specified otherwise, when measuring actual grommet lengths, if pins are used, the pin diameter should be as per Table 2. The guidance was originally prepared by a working group of experts in and was intended to be mainly j assistance to those concerned with the use of cable laid slings and grommets in very heavy lifting operations.
This certificate is valid for a maximum of six months or such lesser period as stated. All unit ropes should have a steel core. The competent person should consider measuring the actual length of the sling or grommet k the length of imcw splice tails, as this can give an important indication of serious deterioration.
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. 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.
Guidance on the manufacture and safe use of cable-laid slings and grommets
They commit to act as responsible members by following relevant guidelines and being willing to be audited against compliance with them by their clients. Damage due to weld arcing, etc.
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. 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.
K factors for the various classes are: Under no circumstances should the grommet contact any surface where the radius is less than 0. 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.
Localised breaks If there are three or more broken wires closely grouped, the effect imfa the sling or grommet should be assessed by an independent competent person. Items 5 to 9 may be illustrated in a sketch. 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. For and on behalf of: For mica purposes, this is taken as 9. WLL will thus be: An inspection or thorough examination is carried out to identify damage or deterioration which affects fitness for use, such as: Guidance document on t 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.
Members are self-regulating through the adoption of IMCA guidelines as appropriate. The grommet must never be bent at this marked position. 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 19 of Dimensional Conformity Appendix 3A.
IMCA M Guidance on The Use of Cable Laid Slings and Grommets _百度文库
For these purposes this is taken as 9. 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. 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 19, as specified in Appendix 6.