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 2 Handling of Dangerous Substances, etc.
Article 256 (Measures in the Case of Manufacture, etc. of Dangerous Substances)
- (1) The employer shall, when manufacturing or handling dangerous substances, in order to prevent explosions or fires, comply with the following provisions:
- (i) As regards explosive substances (meaning those listed in item (1) of Appended Table 1 of the Order), not to bring them close to fire or others that is liable to become a fire source, or heat, rub them or give a shock to them without reason.
- (ii) As regards combustible substances (meaning those listed in item (2) of Appended Table 1 of the Order), not to bring them close to fire or others that is liable to become a fire source, or make them to contact with substances that accelerate oxidation or with water, or heat them, or give a shock to them, corresponding to their types, without reason.
- (iii) As regards oxidizing substances (meaning those listed in item (3) of Appended Table 1 of the Order, the same shall apply hereinafter), not to make them to contact with substances which is liable to accelerate decomposition, or heat, rub them, or give a shock to them without reason.
- (iv) As regards inflammable substances (meaning those listed in item (4) of Appended Table 1 of the Order, the same shall apply hereinafter), not to bring them close to fire or others that is liable to become a fire source, or pour them, make them to evaporate, or heat them without reason.
- (v) To always maintain the places installed facilities that dangerous goods are manufactured or handled with good housekeeping, and not to place flammable or oxidizing substances in the said places without reason.
- (2) A worker shall, in the case set forth in the preceding paragraph, comply with the provisions of each item of the same paragraph.
Article 257 (Operations Leader)
- (1) The employer shall, when carrying out the work manufacturing or handling dangerous substances (excluding the work listed in item (ii) or (viii) of Article 6 of the Order), designate a leader for the said work, and have the said leader direct the said work and carry out the following matters:
- (i) To check as needed the dangerous substances manufacturing or handling facilities and their attached facilities, and when having found any abnormalities, immediately take necessary measures.
- (ii) To check as needed the temperature, humidity, conditions of shading of light and ventilation, etc., in the place where the dangerous substances manufacturing or handling facilities and their attached facilities are installed, and when having found any abnormalities, immediately take necessary measures.
- (iii) In addition to what is listed in the preceding each item, to check as needed the situation handling dangerous substances as needed, and when having found any abnormalities, immediately take necessary measures.
- (iv) To keep records of the measures taken pursuant to the provision of each preceding item.
Article 258 (Work Pouring Inflammable Substances, etc., using a Hose)
- (1) The employer shall, when carrying out the work pouring inflammable substances or combustible gas (meaning those listed in item (5) of Appended Table 1 of the Order, the same shall apply hereinafter) which are in liquid form into a chemical facilities (excluding piping), a tank vehicle, a tank car, a drum, etc., using a hose, not carryout the work unless otherwise having confirmed that the jointing parts of the hose are firmly fastened, or coupled.
- (2) A worker shall, when engaged in the work set forth in the preceding paragraph, not carry out the work unless otherwise prescribed as the same paragraph.
Article 259 (Work Pouring Kerosene, etc., into Facilities with Residual Gasoline)
- (1) The employer shall, when carrying out the work pouring kerosene or light oil into a chemical facilities (limited to the facilities that store dangerous substances, excluding piping; the same shall apply in the next Article), a tank vehicle, a tank car, a drum, etc., in which residual gasoline exists, not carry out the said work unless otherwise having confirmed in advance, that the inside of the chemical facilities, etc., has been made safe by washing, replacing gasoline with inert gas, etc.
- (2) A worker shall, when engaged in the work set forth in the preceding paragraph, not carry out the said work unless otherwise prescribed as the same paragraph.
Article 260 (Work Handling Ethylene Oxide, etc.)
- (1) The employer shall, when carrying out the work pouring ethylene oxide, acetaldehyde or propylene oxide into a chemical facilities, a tank vehicle, a tank car, a drum, etc., not carry out the said work unless otherwise having replaced in advance gas or vapor other than inert gas in the chemical facilities, etc., by inert gas.
- (2) The employer shall, when storing ethylene oxide, acetaldehyde or propylene oxide in a chemical facilities, a tank vehicle, a tank car, a drum, etc., always replace gas or vapor other than inert gas in the chemical facilities, etc., by inert gas.
Article 261 (Prevention of Explosions or Fires by Means of Ventilation, etc.)
- (1) The employer shall, as regards places where it is liable to cause explosions or fires due to existing vapor of inflammable substances, flammable gas or flammable dust, in order to prevent the said explosions or fires, take measures such as ventilation, removal of dust.
Article 262 (Work of Gas Welding, etc., at a Place Where Ventilation, etc., Is Insufficient)
- (1) The employer shall, when carrying out the work welding, cutting or heating of metal using flammable gas and oxygen (hereinafter referred to as “gas, etc.” in this and next Articles) at places where ventilation is insufficient, in order to prevent explosions, fires or burns due to leakage or discharge of gas, etc., at the said places, take the following measures:
- (i) As regards hoses and torches for gas, etc., to use those that is not likely to leakage of gas etc., due to their damages, wear, etc.
- (ii) As regards connection of connecting portions between hoses and torches and between hoses of gas, etc., to fasten securely with hose bands, hose clips, etc.
- (iii) When gas, etc., are supplied to hoses of gas, etc., mount on the hoses a torch that is set so as not to discharge gas, etc., or with a firm stop plug in advance.
- (iv) To display an indication for preventing operational error of the supply of gas, etc., on the valve or cock of the supply inlet of gas, etc., of the hose in operation,by attaching a card showing the name of the operator who handles the hose connected with the said valve or cock, etc..
- (v) When carrying out the work cutting, to provide sufficient ventilation to prevent burns due to the discharge of excessive oxygen from the torches.
- (vi) When leaving the work place due to suspension or completion of the operation, to shut the valve or cock of the supply inlet of gas, etc., and dismantle the hose of gas, etc., from the supply inlet of gas etc., or remove the hose of gas etc., to a place where there is sufficient natural ventilation.
- (2) A worker shall, when engaged in the work set forth in the preceding paragraph, not carry out the said work unless otherwise prescribed as each item of the same paragraph.
Article 263 (Handling of Gas Cylinders, etc.)
- (1) The employer shall, as regards gas cylinders, etc., used for the work of gas welding, etc., (meaning the work listed in item (x) of Article 20 of the Order, the same shall apply hereinafter) comply with the following provisions:
- (i) Not to install, use, store or leave in the following places:
- (a) Places where there is insufficient ventilation.
- (b) Places where fires are used and their vicinities.
- (c) Places where gun powder, dangerous substances, or other explosive or combustible substances or a large quantity of flammable substances are manufactured or handled and their vicinities.
- (ii) To keep the temperature of the gas cylinders, etc., at 40°C or lower.
- (iii) To maintain the gas cylinders, etc., in such a way that they are not likely to fall.
- (iv) Not to give a shock to the gas cylinders, etc.
- (v) When transporting the gas cylinders, etc., to provide with caps.
- (vi) When using the gas cylinder, etc., to remove oil, etc., and dust adhering to the mouthpiece of the cylinder.
- (vii) To open and close the valve of the gas cylinders, etc., gently.
- (viii) To place a cylinder of dissolved acetylene upright.
- (ix) To separate distinctly cylinders before or in use from other cylinders.
- (i) Not to install, use, store or leave in the following places:
Article 264 (Prevention of Ignition, etc., Due to Contact between Different Types of Substances)
- (1) The employer shall, when it is liable to cause ignition or explosion due to contact between different types of substances, not store them close to each other, or take on them by same carrying vehicles. However, this shall not apply to when measures are taken to prevent the said substances from contacting each other.
Article 265 (Places, etc., for Work that Is Liable to Cause a Fire)
- (1) The employer shall ensure that places, equipment, etc., where carried out work raising, rag opening, etc., or work handling a great quantity of cotton, wool, rags, excelsior, straw, wastepaper and other flammable substances, appropriate location or construction to prevent fires.
Article 266 (Prevention of Natural Ignition)
- (1) The employer shall, when piling up substances that are liable to cause danger of natural ignition, take measures to prevent the temperature of the said substances from rising to a dangerous level.
Article 267 (Disposal of Rags, etc., Soaked with Oil, etc.)
- (1) The employer shall, as regards rags, wastepaper, etc., soaked with oil or printing ink, take measures for prevention of fire such as putting them in a non-combustible covered container.
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