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The Safety Ordinance for Cranes

(Ordinance of the Ministry of Labour No.34 September 30, 1972)

Chapter VIII Sling Work

Section 1 Slinging Equipment

Article 213 (Safety Coefficient of Wire Rope Sling.)
  • (1) The employer shall not use a wire rope as the slinging equipment for a crane, a mobile crane or a derrick, unless its safety coefficient is 6 or more.
  • (2) The safety coefficient set forth in the preceding paragraph shall be the value obtained from dividing the breaking load of a wire rope by the value of the maximum load applied on the said wire rope.
Article 213-2 (Safety Coefficient of Chain Sling)
  • (1) The employer shall not use a chain sling as the slinging equipment for a crane, a mobile crane or a derrick unless the its safety coefficient is the value listed in the following each item or more corresponding to the categories of chains listed in the said each item.
    • (i) A chain falling under all of the followings: 4
      • (a) In the case of pulling it with the force of the half of its breaking load, the elongation is 0.5 % or less.
      • (b) The value of the tensile strength is 400 N/mm2 or more and its elongation is equal to or more than the value listed in the right column of the following table corresponding to the value of tensile strength listed in left column of the same table.
        Tensile strength (N/mm2) Elongation (%)
        400 or more and less than 630 20
        630 or more and less than 1000 17
        More than 1000 15
    • (ii) A chain not falling under the preceding item: 5
  • (2) The safety coefficient set forth in the preceding paragraph shall be the value obtained from dividing the breaking load of a chain sling by the value of the maximum load applied on the said chain sling.
Article 214 (Safety Coefficient of Hook, etc.)
  • (1) The employer shall not use a hook or a shackle as slinging equipment for a crane, a mobile crane or a derrick, unless the safety coefficient is 5 or more.
  • (2) The safety coefficient set forth in the preceding paragraph shall be the value obtained from dividing the breaking load of the hook or the shackle by the value of the maximum load applied on the said hook or the said shackle.
Article 215 (Prohibition of Use of Inadequate Wire Rope)
  • (1) The employer shall not use a wire rope falling under any of the following each item for the slinging equipment for a crane, a mobile crane or a derrick:
    • (i) A wire rope that 10% or more of element wires (excluding filler wires) are cut in one lay;
    • (ii) A wire rope that the decrease in its diameter exceeds 7% of the nominal diameter;
    • (iii) A kinked wire rope;
    • (iv) A wire rope with remarkable deformation or corrosion.
Article 216 (Prohibition of Use of Inadequate Lifting Chain)
  • (1) The employer shall not use a lifting chain falling under any of the following each item for the slinging equipment for a crane, a mobile crane or a derrick:
    • (i) A lifting chain with the elongation of exceeding 5 % to the original length at the time of manufacturing the said lifting chain;
    • (ii) A lifting chain that the decrease in its diameter on the cross section exceeds 10 % of the original diameter on the cross section of the said link at the time of manufacturing the said lifting chain;
    • (iii) A lifting chain with cracked links.
Article 217 (Prohibition of Use of Inadequate Hook, Shackle, etc.)
  • (1) The employer shall not use the deformed or cracked metallic implements such as a hook, a shackle, a ring, etc., as slinging equipment for a crane, a mobile crane or a derrick.
Article 218 (Prohibition of Use of Inadequate Fiber Rope, etc.)
  • (1) The employer shall not use a fibre rope or a fibre belt falling under any of the following each item as the slinging equipment for a crane, a mobile crane or a derrick:
    • (i) A fiber rope or a fiber belt with cut strands;
    • (ii) A fiber rope or a fiber belt with remarkable damage or corrosion.
Article 219 (Fitting of Rings, etc.)
  • (1) The employer shall not use a wire rope or a lifting chain excluding the endless ones as slinging equipment for a crane, a mobile crane or a derrick, unless those are fitted with hooks, shackles, rings or eyes at their both ends.
  • (2) The eyes set forth in the preceding paragraph shall be of the eye splice or ferrule secured eye, or the one made by the method preserving the strength equal to or more to them. In this case, the eye splice shall be made in the manner to weave all the strands into one another by three times or more, then to cut the half of element wires of each strand and weave again the remaining element wires into one another by two times or more (in case of weaving all strands by four times or more, one or more times).
Article 219-2 (Limiting of Range of Use)
  • (1) The employer shall, when carrying out the sling work using slinging equipment with the magnet system or the vacuum system, a chain block or a chain lever hoist (hereinafter referred to as "slinging equipment" in this paragraph), make use of the said slinging equipment within its working load limit.
  • (2) The employer shall, when carrying out the sling work using a lifting clamp, carry out the sling work corresponding to the purpose of use of the said lifting clamp, and make use of the said clamp within its working load limit.
Article 220 (Checkup before Commencing Work)
  • (1) The employer shall, when carrying out the sling work using a wire rope, lifting chain, fiber rope, fiber belt or metallic implement such as a hook, shackle and ring (hereinafter referred to as "wire ropes, etc.", in this Article) which are used as the slinging equipment for a crane, mobile crane or derrick, check up abnormalities on the said wire ropes, etc. before commencing the work for the day.
  • (2) The employer shall, when any abnormality is found based on the checkup set forth in the preceding paragraph, immediately repair.
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