IMCA M 179 PDF

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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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. Compacted or deformed unit ropes are not allowed to be used. For and on behalf of: WLL will thus be: This is calculated as follows: The actual unit rope breaking load should be equal to or greater than the calculated breaking load in accordance with paragraphs 2. For these applications, f 1799 taken as not less than 2.

IMCA publishes guidance on the manufacture and safe use of cable-laid slings and grommets

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. Dimension h should be 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.

In addition, the actual length of the sling is critical if it is used as part of a matched set. Items 19 to 9 may be illustrated in a sketch. The method of splicing must be mentioned on the consolidation test certificate see Appendix 2. For core unit ropes also seven strands can be used.

Appendix 5 gives guidance on the assessment of the condition of the sling or grommet and on discard. They commit to act as responsible members by following relevant guidelines and being willing to be audited against compliance with them by their clients. Such operations often use cable laid slings and grommets of mm diameter and over, as developed for use in the offshore oil industry.

These are generally too large for existing test equipment to be used to test the rope sample to destruction.

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. For these purposes this is taken as 9. For these purposes, this is taken as 9. Diameter of cable laid rope Pin diameter mm mm mm mm Table 2 — Pin Diameters mm 1779 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 imxa certificate of dimensional conformity Appendix 3B.

The following certificates should be issued for each sling or grommet and should be available to all interested parties on imcaa Lay Factors For core unit and outer unit ropes: Each cable laid sling should also be marked with a longitudinal line to show its alignment when originally measured see paragraph 2.

IMCA M Guidance on The Use of Cable Laid Slings and Grommets _百度文库

There are two core activities that relate to all members: I, the undersigned, thoroughly examined the above and certify that they showed no apparent defects or damage which umca affect the strength or safe use. 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. 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 imac in Appendix 6.

The grommet must never be bent at this marked position. The original working group membership for PM20 was as follows: Consolidation certificate number Sling number Customer Measured length L? 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.

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.

Guidance on the manufacture and safe use of cable-laid slings and grommets

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. All tucks should be over one and under two.

1779 For a grommet, the core butt position and the tuck position should be marked by red paint see paragraph 5. Guidance of Solder Pas Damaged or defective terminations Particular attention should be paid to signs 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.

CSBL f is as defined in paragraph 3. Guidance document on t A grommet contains one tuck splice diametrically opposite the core butt 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 Certificate of Dimensional Conformity Appendix 3A.

The competent person should consider measuring the actual length of the sling or grommet and imda length of the splice tails, as this can give an important indication of serious deterioration.

An inspection or thorough examination is carried out to identify damage or deterioration which affects fitness for use, such as: Unless specified otherwise, when measuring actual grommet lengths, if pins are used, the pin diameter should imcaa as per Table 2. 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 difference in length between slings of matched pairs should not exceed 0. The sixth tuck can be made with one half of the strands from the outer unit ropes.

Under no circumstances should the grommet contact any surface icma the radius is less than 0.