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Ordinance on Safety and Health of Work under High Pressure
(Revised in terms of the Title March 19, 1977 by Ministry of Labour Ordinance No. 2)
Ministry of Labour Ordinance No. 40, September 30, 1972

Latest Amendments:
Ministry of Health, Labour and Welfare Ordinance No. 171 of July 16, 2001
In Japanese

Chapter III.  Management of Work

Section 1.  Operations Chiefs, etc.

(Operations Chief)
  1. Article 10. In terms of the work in compressed air in compliance with item 1 of Article 6 of the Cabinet Order, the employer shall appoint one operations chief responsible for each work chamber, out of those who are licensed as operations chiefs of work in compressed air.
  2. The employer shall make the said operations chief carry out the matters given below:
    1. Make a decision on how to carry out the work, and supervise directly the compressed air workers.
    2. Check the devices used to measure the concentrations of carbon dioxide and harmful gases (which correspond to carbon monoxide, methane, hydrogen sulfide, and other gases other than carbon monoxide, which may induce explosion, fire, other dangerous situations, or damage to health, similarly as in the following).
    3. Check the number of compressed air workers, when the workers are made to enter or leave the work chamber room for the said work.
    4. Maintain the pressure within the work chamber in a proper state by contacting those who engage in the work there to operate valves or cocks by which to regulate the volumes of the air fed to the said work chamber.
    5. Assume appropriate measures thereby to apply compression or decompression to the compressed air workers, in compliance with the provisions of Article 14 or Article 18 by contacting those who are engaged in the work thereby to operate valves or cocks to regulate the air fed to or exhausted from the man-lock.
    6. To assume necessary measures in case the compressed air workers should become health impairment in the work chamber or the man-lock.
(Special Education)
  1. Article 11. When the employer has workers engage in the work as described below, the employer shall give the said workers special education concerning the said work:
    1. Operating the air compressor by which air is fed to a work chamber or to a man-lock.
    2. Operating the valves or cocks by which to regulate the air supplied to the work chamber.
    3. Operating the valves or cocks by which to regulate the air fed to or exhausted from the man-lock.
    4. Operating the valves or cocks which regulate the air fed to the diving workers.
    5. Operating the recompressing lock.
    6. Work in compressed air.
  2. The education as said above shall be carried out in terms of the items given in the right columns of the Table below, depending upon the type of work as shown in the left column of the said Table.
    Type of work Items to be taught
    Work to operate an air compressor by which air is fed to a work chamber or to a man-lock 1. Items concerning knowledge of compressed air methods.2. Items concerning structure and operation of air feeding equipment.3. Items concerning knowledge of compressed air hazards.4. Related laws and ordinances.5. Actual techniques to operate an air compressor.
    Work to operate valves or cocks by which air is fed to work chamber 1. Items concerning knowledge of compressed air methods.2. Items concerning air feeding and air exhausting.3. Items concerning knowledge of compressed air hazards.4. Related laws and ordinances.5. Actual techniques to regulate feeding of air.
    Work to operate valves or cocks by which air is fed to or air is exhausted from a man-lock. 1. Items concerning knowledge of compressed air methods.2. Items concerning how to apply compression and decompression and also how to make ventilation.3. Items concerning knowledge of compressed air hazards.4. Related laws and ordinances.5. Actual techniques concerning how to apply compression and decompression and also how to make ventilation of air.
    Work to operate valves and cocks by which air is fed to diving workers. 1. Items concerning knowledge of diving operations.2. Items concerning air feeding.3. Items concerning knowledge of compressed air hazards.4. Related laws and ordinances.5. Actual techniques thereby to regulate air feeding.
    Work to operate recompressing locks. 1. Items concerning knowledge of compressed air hazards.2. Items concerning methods of decompressing in case of emergency.3. Items concerning methods for first-aid treatment.4. Related laws and ordinances.5. Actual techniques concerning how to operate recompression locks and first-aid treatment.
    Work to operate compressed air. 1. Items concerning knowledge of compressed air methods.2. Items concerning knowledge of the facilities related to compressed air methods.3. Items concerning the prevention of drastic pressure drop, fire, etc.4. Items concerning knowledge of compressed air hazards.5. Related laws and ordinances.
  3. 3.  In addition to these items, as provided for in Articles 37 and 38 of the Ordinance on Industrial Safety and Health (Ministry of Labour Ordinance No. 32 of 1972, and hereinafter called "Safety and Health Ordinance"), as well as the ones as described in the preceding two paragraphs, the Minister of Health, Labour and Welfare will establish items necessary for the execution of the special education prescribed in the same paragraph.
(Diving Workers)

Article 12.The employer shall not have any person engage in diving operations unless he has been licensed as a diving worker.

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