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 6 Acetylene Welding Equipment and Gas Welding Equipment Using Manifold
Subsection 3 Management
Article 312 (Management, etc., of Acetylene Welding Equipment)
- (1) The employer shall, when carrying out the work welding, cutting or heating of metals using acetylene welding equipment, comply with the following provisions:
- (i) To post the type, model, manufacturer's name, calculated quantity of hourly average gas generation, and the quantity of carbide fed in one lot at a readily visible location in the generator rooms (excluding the gas generators of portable acetylene welding equipment).
- (ii) To prohibit persons other than those in charge from entering the generator room without reason and display a notice to that effect in an appropriate manner.
- (iii) To prohibit smoking, use of fire or acts that are liable to produce sparks at places within 5 m from the generators and within 3 m from the generator room, and display a notice to that effect in an appropriate manner.
- (iv) To take measures to distinguish supply lines for oxygen from those for acetylene.
- (v) To provide appropriate fire extinguishing equipment at s place where acetylene welding equipment is installed.
- (vi) Not to install the generators of portable acetylene welding equipment at places where the temperature is high, ventilation is insufficient, there is much vibration, etc.
- (vii) To have the person engaging in the said work wear eye protector and protective gloves.
Article 313 (Management, etc., of the Gas Welding Equipment using Manifold)
- (1) The employer shall, when carrying out welding, cutting or heating of metal using the gas welding equipment using manifold, comply with the following provisions:
- (i) To display the name of the gas used and the maximum quantity of gas stored at a readily visible location in the gas manifold room.
- (ii) When a gas cylinder is exchanged, to have the operations chief of gas welding attend.
- (iii) To prohibit persons other than those in charge from entering the gas manifold rooms without precautions, and post a notice to that effect at a readily visible location.
- (iv) To prohibit Smoking, uses of fire or acts that may produce sparks at places within 5 m from the gas manifolds, and post a notice to that effect at a readily visible location.
- (v) To displaythe guideline of operation and inspection of a valve, a cock, etc., at an easily visible location in the gas manifold room.
- (vi) To take measures to distinguish supply lines for oxygen from those for gas.
- (vii) To install appropriate fire extinguishing equipment at the place where a gas manifold are installed.
- (viii) To have a person engaging in the said work wear eye protector and protective gloves.
Article 314 (Appointment of an Operations Chief of Gas Welding)
- (1) The employer shall, as regards the work set forth in item (ii) of Article 6 of the Order, appoint an operations chief of gas welding from persons who have the license operations chief of gas welding
Article 315 (Duties of an Operation Chief of Gas Welding)
- (1) The employer shall, when carrying out welding, cutting or heating of metal using an acetylene welding equipment, have an operations chief of gas welding carry out the following matters:
- (i) To decide a work method, and direct the work.
- (ii) To have the worker engaging in handling acetylene welding equipment carry out the following matters:
- (a) Not to use a tool which is liable to produce sparks for, or give shocks to, the generator during use.
- (b) When checking gas leakage from acetylene welding equipment, to use a safe method such as using of soap water.
- (c) Not to put things on the gas bell of the generator without reason.
- (d) Not to leave the door of the entrance to the generator room open.
- (e) When recharging carbide to the generator of portable acetylene welding equipment, to do such operations at a safe place out of doors.
- (f) When opening a carbide can, not to perform acts that are liable to produce sparks, such as giving shocks.
- (iii) When starting the said work, to check up acetylene welding equipment, and when a mixture of air and acetylene exists in the generator, remove such a mixture.
- (iv) To place the safety equipment at a place where its water-level can easily be checked during operations, and check the said safety device once or more a day.
- (v) When keeping warm or heating the acetylene welding equipment to prevent water in the equipment from freezing, to apply a safe method, such as using warm water or steam.
- (vi) When suspending the use of the generator, to keep its water level in such a condition that water and residual carbide may not contact each other.
- (vii) When repairing, processing, transporting or storing the generator, or suspending its use continuously, to remove acetylene and carbide from it completely.
- (viii) To dispose carbide sludge in a safe manner such as keeping it in a sludge pit until the danger due to gas is removed.
- (ix) To monitor the use of eye protector and protective gloves by workers engaged in the said work.
- (x) To carry the license of an operations chief of gas welding.
Article 316
- (1) The employer shall, when carrying out welding, cutting or heating of metal using the gas welding equipment using manifold, have the operations chief of gas welding carry out the following matters:
- (i) To decide a work method and supervise the work directly.
- (ii) To have the worker engaging in the handling of the gas manifolds carry out the following matters:
- (a) To remove oil, etc., and dust, etc., adhering to the mouthpiece of the gas cylinder and the mounting opening of the piping.
- (b) When having exchanged gas cylinders, to check the mouthpiece of the gas cylinder and the mounting opening of the piping for leakage of gas, and remove the mixture of the gas and air in the piping.
- (c) When checking leakage of gas, to apply safe method such as using soap water.
- (d) To Open and close the valve or cock gently.
- (iii) To be present when the gas cylinders are exchanged.
- (iv) When starting the said work, to check the hose, torch, hose band, etc. , and when having found that there is a danger of leakage of gas or oxygen due to damage, wear, etc., to repair or exchange the parts damaged, worn, etc.
- (v) To place the safety equipment at a place where its functions can easily be observed, and check the said safety device once or more a day.
- (vi) To monitor the use of eye protector and protective gloves by workers engaged in the said work.
- (vii) To carry the license of an operations chief of gas welding.
Article 317 (Periodical Self-inspections)
- (1) The employer shall, as regards an acetylene welding equipment or a gas welding equipment using manifold (excluding the portions of the piping of those devices installed underground; hereinafter the same shall apply in this Article), carry out self-inspections for the existence of damage, deformation, corrosion, etc., and the functions of the said equipment periodically once every period within a year. However, this shall not apply to the non-use period of an acetylene welding equipment or a gas welding equipment using manifold, which is not used for a period exceeding one year.
- (2) The employer shall, as regards the acetylene welding equipment or a gas welding equipment using manifold set forth in the proviso of the preceding paragraph, carry out self-inspection for the matters prescribed by the same paragraph before resuming the operation.
- (3) The employer shall, when any abnormality is found in the said acetylene welding equipment as a result of the self-inspections set forth in the preceding two paragraphs, not use the said equipment unless repair or other necessary measures have been taken.
- (4) The employer shall, when having carried out the self-inspections set forth in paragraph (1) and (2), record the following matters and preserve the records for three years:
- (i) The date of the inspection
- (ii) The method of the inspection
- (iii) The parts of a machine inspected
- (iv) The results of the inspection
- (v) The name of the person who has carried out the inspection
- (vi) When measures such as repair have been taken based on the result of the inspection, their contents.
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