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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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adverse to operational practices which followed the guidelines formerly available in PM Corrosion The sling should be withdrawn from service and referred to an independent competent person for thorough examination where corrosion detrimental to the strength of the sling is suspected.
For these purposes this is taken as 9. The original working group membership for PM20 was as follows: 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. A certificate of examination see Appendix 4 should be renewed after each thorough examination.
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.
Significant distortion of the rope The sling should be discarded when distortion due to kinking, crushing, core collapse or knotting is identified. Members are self-regulating through the adoption of IMCA guidelines as appropriate.
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. For these purposes, this is taken as 9.
The bending factor EB shall be calculated according to the formula: 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.
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.
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 immca details should be shown on the Certificate of Dimensional Conformity Appendix 3A. 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.
Such operations n 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.
A grommet contains one tuck splice diametrically opposite the core butt position. Items 5 to 13 may be illustrated in a sketch. All tucks should be over one and under two.
Lay Factors For core unit and outer unit ropes: 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 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.
An inspection or thorough examination is carried out to identify damage imda deterioration which affects fitness for use, such as: 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.
Guidance on the manufacture and safe use of cable-laid slings and grommets – IMCA
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 minimum remaining undistorted sling length between the splices of both sling ends shall, in all cases, be at least 15d, where mm is the nominal diameter of the cable laid rope forming the sling.
Appendix 5 gives guidance on the assessment of the condition of the sling or grommet and on discard. Bending factor for the bend of a grommet at its ends or when used as a doubled grommet at the grommet body. Sketches can be enclosed In addition, the actual length of the sling is critical if it is used as part of a matched set.
This note, therefore, gives advice imc their construction, rating, testing, certification, examination and use. The following certificates 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.
Damage due to weld arcing, etc. A thorough examination should be carried out: Consolidation certificate number Sling number Customer Measured length L?
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.
IMCA M Guidance on The Use of Cable Laid Slings and Grommets _百度文库
For these applications, f is taken as not less than 2. Dimension w should be in accordance with Table 1 with h at least 2w.
The guidance was originally prepared by a working 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. 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. Damaged or defective terminations Particular attention should be paid to signs of: Under no circumstances should the sling body contact any surface where the radius is less than 0.
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 sixth tuck can be made with one half of the strands from the outer unit ropes.
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. The method of splicing must be mentioned on the consolidation test certificate see Appendix 2. This is calculated as follows: The grommet must never be bent at this marked position.
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.