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 8 Miscellaneous Provisions
Article 322 (Underground Workshop, etc.)
- (1) The employer shall, when carrying out the work at underground workshop where is liable to generated flammable gas, (excluding the case of carrying out construction works of tunnels etc., prescribed by Article 382) or when carrying out an open-cut excavation work(meaning the excavation work of natural ground or transportation, etc., of earth and rocks associated with the excavation [limited to those work which are carried out at places where excavating work of natural ground are carried out and in the vicinity of the said places]; the same shall apply hereinafter) at places where is liable to discharged gas from gas supply lines, take the following measures in order to prevent an explosion or fire:
- (i) To appoint a person in charge of measuring the concentration of these gas, and have the said person measure the concentration of these gas every day before commencing the work and whenever having found any abnormality related to these gas at places where is liable to generated or stagnant these gas.
- (ii) When having found the concentration of these gas to reach 30 % or more of the value of the explosion lower limit, have workers evacuate to a safe place immediately, suspend use of fire or any other things that is liable to become an ignition source, and provide drafting, ventilation, etc.
Articles 323 and 324 (Deleted)
Article 325 (Place Where Strong Light Is Emitted)
- (1) The employer shall enclose places where is liable to cause dangers due to strong lightsuch as welding ark is emitted. However, this shall not apply to when it is inevitable due to the nature of the operation.
- (2) The employer shall, as regards places set forth in the preceding paragraph, provide appropriate personal protective equipment.
Article 326 (Pressurized Feeding Facilities of Corrosive Liquid)
- (1) The employer shall, when carrying out the work of pressure feeding with power and through hoses those liquids which is liable to cause danger of a corrosive effect on the skin, such as sulfuric acid, nitric acid, hydrochloric acid, acetic acid, chlorosulfonic acid, caustic soda solution and cresol (hereinafter referred to as “corrosive liquids”), take the following measures for the facilities used in the said work:
- (i) To provide a pressure gauge at a readily visible location for the person who operates the said facilities used for pressure feeding(hereinafter referred to as the “operator” in this Article), and a power cutting-off device at a place where the operator can easily operate it, respectively.
- (ii) To use the hoses and their connecting tools that have anti-corrosiveness, heat-proofing and cold-proofing to the corrosive liquids fed.
- (iii) For hoses, to set the pressure for their safe use by conducting hydraulic tests, etc., and indicate the set pressure on hoses, and not to feed using a pressure exceeding the pressure.
- (iv) When it is liable to an abnormal pressure acting on the inside of hoses, to provide the facilities used for pressure feeding with preventive device for excessive pressurizing such as unloaders and return valves.
- (v) To connect securely the connecting parts of hoses and pipes other than hoses, and between hoses using connecting tools.
- (vi) When carrying out pressure feeding at a gauge pressure exceeding 200 kPa, as regards the connecting tool set forth in the preceding item, to use those which structure is unlikely to cause disconnection due to the said pressure such as of the screwed-connection type, three-hook connection type, etc., those having three or more bottoms at the part mounted hoses, etc.
- (vii) To appoint an operator and have the said operator watch the operation of the facilities used for pressure feeding and the pressure gauge.
- (viii) To check hoses and their connecting tools before commencing the use of the day, and to exchange them when it is liable to cause scattering or leakage of corrosive liquids due to defect such as damage and corrosion.
Article 327 (Personal Protective Equipment)
- (1) The employer shall have the worker engaging in pressure feeding work of corrosive liquids wear personal protective equipment necessary to prevent the body from the danger of corrosion due to scattered, leaked or overflowing corrosive liquid.
- (2) The worker engaging in the work set forth in the preceding paragraph shall, when having been instructed to wear the personal protective equipment set forth in the same paragraph, wear it.
Article 328 (Restriction on the Use of Gas Other Than Air)
- (1) The employer shall, when carrying out the pressure feeding work of corrosive liquid using the pressure of compressed gas as power source, not use gas other than air for the said compressed gas. However, in the case of having completed the said work, and when removing the said gas immediately, or when taking measures of indicating the existence of the said gas, etc., which are unlikely to cause danger of suffocation due to workers entering the facilities used for the said pressure feeding, nitrogen or carbon dioxide gas may be used.
Article 328-2 (Work Standards for Filling Tires with Air)
- (1) The employer shall, in the case of assembling a tire for an automobile (excluding two-wheeled vehicle) (hereinafter referred to as “tires” in this Article) and filling a tire with air using an air compressor, in order to prevent danger due to a burst tire, etc., have the worker engaging in said work adjust air pressure appropriately corresponding to the type of tire and use appliances such as safety enclosures etc., in order to prevent pieces of burst tires, etc., from flying.
- (2) The worker engaging in the work set forth the preceding paragraph shall adjust air pressure appropriately corresponding to the type of tire and use the appliances set forth in the same paragraph.
Article 328-3 (Ship Refitting, etc.)
- (1) The employer shall, in the case of carrying out ship refitting, repairs and cleaning, etc., and when carrying out the work using machine, etc., that generates sparks or arcs or reaches high temperatures, becoming a potential source of ignition, or work using fire in areas inside the said ship such as the hold or adjoining areas, measure the concentrations of vapor of inflammable substances and flammable gas in the work place and surrounding areas before commencing the said work and as needed during said work.
Article 328-4 (Refitting, etc., of Equipment for the Manufacture of Liquid Oxygen)
- (1) The employer shall, in the case of carrying out refitting, repairing and cleaning, etc., of the facilities for the manufacture of liquid oxygen, and when carrying out the said work inside the said facilities, comply with the following provisions:
- (i) To decide the method and procedure of the said work, and make them known to the workers concerned in advance.
- (ii) To designate a leader for the said work and have the said leader directs the said work.
- (iii) To close valves or cocks doubly or apply baffle in addition to closing valves or cocks in order to prevent the work place from leakage of oxygen.
- (iv) To lock the valves, cocks and baffle set forth in the preceding item, indicate an instruction that they shall not be opened or place a watcher.
Article 328-5 (Manufacturing, etc., of Hydroxylamine etc.)
- (1) The employer shall, when manufacturing and handling hydroxylamine or its salt (hereinafter referred to as “hydroxylamine etc.” in this Article), in order to prevent explosion, comply with the following provisions:
- (i) To take measures to prevent the abnormal reaction between hydroxylamine, etc., and ferrous ion, etc., such as prevention of interfusion of ferrous ion etc., to hydroxylamine etc.
- (ii) When carrying out the heating work of hydroxylamine, etc., to adjust temperature.
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