Ordinance on Industrial Safety and Health
Ministry of Labour Ordinance No. 32 of September 30, 1972
Latest Amendments:
Ministry of Health, Labour and Welfare Ordinance No. 47 of March 30, 2007
In Japanese
掲載日：2008.03.28
Part II Safety Standards
Chapter IV Prevention of Explosion, Fire, etc
Section 1 Prevention of Explosion, Fire, etc., Due to Molten High-temperature Substance, etc.
Article 248 (Structure of High-temperature Substance Handling Facilities)
- (1) The employer shall, as regards furnace and other facilities handling a large quantity of high-temperature substances, ensure that they have a structure necessary to prevent fires.
Article 249 (Molten High-temperature Substance Handling Pit)
- (1) The employer shall, in order to prevent steam explosions, as regards molten high-temperature minerals (hereinafter referred to as “molten high-temperature substance”) handling pit (excluding those processing high-temperature slag with water), take the following measures :
- (i) To have the structure enabling to prevent underground water from penetrating. However, this shall not apply to when the pits are equipped with facilities enabling discharging stagnant underground water inside the pit.
- (ii) To install partitions or other facilities enabling to prevent work-use water or rain water from penetrating around the pit.
Article 250 (Structure of Building)
- (1) The employer shall, in order to prevent steam explosions, as regards buildings, which have molten high-temperature substance handling facilities inside, take the following measures:
- (i) To have a floor surface with structure, which prevent stagnant water.
- (ii) To have a roof, a wall, a window, etc., with structure enabling to prevent rainwater from penetrating.
Article 251 (Work Handling Molten High-temperature Substance)
- (1) The employer shall, when carrying out the work handling molten high-temperature substance (excluding work processing high-temperature slag with water and work disposing the said slag), in order to prevent steam explosions, not carry out the said work unless otherwise having confirmed that the pit set forth in Article 249, the floor surface of building set forth in the preceding Article, and other molten high-temperature substance handling facilities are free of stagnant water, or are not wet.
Article 252 (Water Processing, etc., of High-temperature Slag)
- (1) The employer shall, as regards places where high-temperature slag are processed with water, or are disposed, in order to prevent steam explosions, take the following measures. However, this shall not apply to the case that water smash processing is carried out:
- (i) The places where high-temperature slag are processed with water, or are disposed, are of well drained.
- (ii) The places where high-temperature slag is disposed be indicated that matter.
Article 253
- (1) The employer shall, when carrying out the work processing high-temperature slag with water, or work disposing the said slag, in order to prevent steam explosions, not carry out the said work unless otherwise having confirmed that the places set forth in the preceding Article are free of stagnant water . However, this shall not apply to the case that water smash processing is carried out.
Article 254 (Work Putting Metal Scraps in Furnace)
- (1) The employer shall, when carrying out the work putting metal scraps in a furnace, in order to prevent steam explosions and other explosions, not carry out the said work unless otherwise having confirmed that the said metal scraps are not containing water, gunpowder, dangerous substances (meaning those listed in Appended Table 1 of the Order, the same shall apply hereinafter), airtight containers, etc.
Article 255 (Prevention of Burns, etc.)
- (1) The employer shall, as regards a blast furnace, a cupola, glass melting furnace and other places where work handling a large quantity of high-temperature substances is carried out, in order to prevent burns or other danger due to the scattering, outflow, etc., of the said high-temperature substances, take appropriate measures.
- (2) The employer shall provide the places set forth in the preceding paragraph with appropriate personal protective equipment in order to prevent burns and other dangers.
- (3) A worker shall, when carrying out the work set forth in paragraph (1), use the personal protective equipment set forth in the preceding paragraph.
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