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Enforcement Order of the Industrial Safety and Health Act
Cabinet Order No. 318, August 19, 1972

Amendments:
Cabinet Order No. 331. Oct 20, 2006

掲載日：2008.03.25

Article 1 (Definition)
  • For the purpose of this Cabinet Order, the terms listed in the following items shall be defined as follows:
    • (i) "acetylene welding equipment" shall be defined as the equipment composed of acetylene generators, safety devices, distributing tubes, blowpipes, etc. and welding, cutting or heating metals by means of acetylene and oxygen other than dissolved acetylene.
    • (ii) "gas welding equipment using manifold" shall be defined as the equipment composed of gas manifolds (meaning the equipment composed of 10 or more containers of flammable gases (meaning the gases listed in item (5) of Appended Table 1 ; hereinafter the same) connected to each other with distributing tubes or the equipment composed of 9 or less containers of flammable gases connected to each other with distributing tubes, and the total internal volumes of the said containers are 400 liters or more for hydrogen or dissolved acetylene, and also 1,000 liters or more for other flammable gases), safety devices, pressure regulators, distributing tubes, blow pipes, etc., and welding, cutting or heating metals by means of flammable gases and oxygen.
    • (iii) "boiler" shall be defined as a steam boiler or a hot water boiler other than boilers listed in followings:
      • (a) Steam boilers used at a gauge pressure of 0.1 MPa or less with a heating surface area calculated as provided for by the Ordinance of the Ministry of Health, Labour and Welfare (hereinafter referred to as "heating surface area") of 0.5 m2 or less or with a drum having an inner diameter of 200 mm or less and a length of 400 mm or less;
      • (b) Steam boilers used at a gauge pressure of 0.3 MPa or less with an internal cubic volume of 0.0003 m3 or less;
      • (c) Steam boilers with a heating surface area of 2 m2 or less fitted with a steam pipe having an inner diameter of 25 mm or more open to the atmosphere, or fitted with a U-shaped vertical pipe having a gauge pressure of 0.05 Mpa or less and an inner diameter of 25 mm or more at the steam generating section;
      • (d) Hot water boilers with a gauge pressure of 0.1 MPa or less with a heating surface area of 4 m2 or less;
      • (e) Once-through boilers (excluding those of multi-pipe type with a header having an inner diameter exceeding 150 mm) used at a gauge pressure 1 MPa or less with a heating surface area of 5 m2 or less (for those boilers with steam separator, limited to the said steam separator having an inner diameter of 200 mm or less and an internal cubic volume of 0.02 m3 or less);
      • (f) Once-through boilers with an internal cubic volume of 0.004 m3 or less (limited to those boilers without both a header and a steam separator)and the product of the maximum operating pressure gauge expressed in MPa multiplied by the internal cubic volume expressed in m3 are 0.02 or less.
    • (iv) "small-sized boiler" shall be defined as boilers listed in followings:
      • (a) Steam boilers used at a gauge pressure of 0.1 MPa or less with a heating surface area of 1 m2 or less or a drum having an inner diameter of 300 mm or less and a length of 600 mm or less;
      • (b) Steam boilers with a heating surface area of 3.5 m2 or less and a steam pipe having an inner diameter of 25 mm or more open to the atmosphere or with a gauge pressure of 0.05 MPa or less and fitted with a U-shaped vertical pipe having an inner diameter of 25 mm or more at the steam generating section;
      • (c) Hot water boilers with a gauge pressure of 0.1 MPa or less and a heating surface area of 8 m2 or less;
      • (d) Hot water boilers with a gauge pressure of 0.2 MPa or less and a heating surface area of 2 m2 or less;
      • (e) Once-through boilers (excluding those multi-pipe type with a header having an inner diameter exceeding 150 mm) used at a gauge pressure of 1 MPa or less with a heating surface area of 10 m2 or less (for the boilers with steam separator, limited to the said steam separator having an inner diameter of 300 mm or less and an internal cubic volume of 0.07 m3 or less ).
    • (v) "class-1 pressure vessel” shall be defined as vessels (excluding those vessels used at a gauge pressure of 0.1 MPa or less with an inner cubic volume of 0.04 m3 or less or with an inner diameter of 200 mm or less and the length 1,000 mm or less and having the product of the maximum operating gauge pressure expressed in MPa multiplied by the internal cubic volume expressed in m3 are 0.004 or less) listed in followings:
      • (a) Of the vessels heating solids or liquids by receiving vapor or other heat media or by generating vapor, those having an internal pressure exceeding the atmospheric pressure (excluding vessels listed in items (b) or (c));
      • (b) Of the vessels generating vapor by chemical, nuclear or other reactions, those having an internal pressure exceeding the atmospheric pressure;
      • (c) Of the vessels for generating vapor by heating liquids contained therein to separate components of the said liquids, those with an internal pressure exceeding the atmospheric pressure;
      • (d) In addition to the vessels listed in (a) to (c), the vessels containing liquids at a temperature exceeding their boiling points at the atmospheric pressure.
    • (vi) "small-sized pressure vessel" shall be defined as the class-1 pressure vessels listed in followings:
      • (a) Of the vessels used at a gauge pressureof 0.1 Mpa or less, those with an internal cubic volume of 0.2 m3 or less or with drum having an inner diameter of 500 mm or less and the length of 1,000 mm or less;
      • (b) The vessels of the product of the maximum operating gauge pressure expressed in MPa multiplied by the internal cubic volume expressed in m3 are 0.02 or less.
    • (vii) "class-2 pressure vessel" defined as the vessels containing gas with a gauge pressure of 0.2 MPa or more (excluding the class-1 pressure vessels) listed in followings:
      • (a) The vessels with an inner cubic volume of 0.04 m3 or more;
      • (b) The vessels with a drum having inner diameter of 200 mm or more and length 1,000 mm or more.
    • (viii) "mobile crane" shall be defined as the cranes with a build-in prime mover and capable of moving to unspecified places.
    • (ix) "light capacity lift" shall be defined as, among elevators (limited to the elevators installed in the workplaces of enterprises listed in item (1) to (5) of Appended Table 1 of the Labour Standards Act (Act No. 49 of 1947), excluding stage lifting equipment used at theater, lifting facilities on ships subject to the Ship Safety Act (Act No. 11 of 1933) and installed mainly for use by the general public; hereinafter the same),those intended only for carrying cargos and having a cage with a floor area of 1 m2 or less and the ceiling height of 1.2 m or less (excluding lifts for construction work defined in the next item).
    • (x) "construction lift" shall be defined as elevators intended only for carrying cargo in civil engineering and construction work, etc. (excluding skip hoists with the angle between the guide rail and the level plane less than 80 degrees.)
    • (xi) "gondola" shall be defined as the equipment composed of a hanging scaffold, raising and lowering equipment, other equipment and their accessories, and the working platform of the said hanging scaffold ascends or descends by the said raising and lowering equipment.
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