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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 II.  Facilities

Section 2.  Facilities for Diving Operations

(Air Reservoir)

  1. Article 8.  When the employer feeds air to workers engaged in diving operations (hereinafter called diving workers) using an air compressor, the employer shall provide one air reservoir thereby to regulate the volume of fed air and one more air reservoir therein to store the air necessary in case of an accident (hereinafter called the "emergency air reservoir") per diving worker being fed with air by the said air compressor.
  2. The emergency air reservoir shall comply with the requirements given in the following:
    1. The infra-air-reservoir pressure levels shall be regularly 1.5 times as high as the pressure levels at the maximum diving depth or more.
    2. The inside volume of the air reservoir shall of a value equal to that obtained by the formula of (a) or (b), or higher.
      1. When the employer has the diving workers use pressure regulator.a
        V=40(0.03D+0.4)/P
        where V= The inside volume of the air reservoir (liter) D=Maximum diving depth (m) P=Pressure of air within the air reservoir (MPa)
      2. In the case other than described in preceding paragraph a.
        V=60(0.03D+0.4)/P
  3. When the air reservoir thereby to regulate the air set forth in paragraph 1 complies with the requirements as provided by the respective items of the preceding paragraph, the said emergency air reservoir can be omitted in spite of the provisions of paragraph 1.

(Air Cleaning Device and Flow Meter)

Article 9.  When the employer feeds air to the diving workers using the air compressor, the employer shall provide devices thereby to clean the air fed to the said diving workers and also flow meters thereby to measure the flow volume of the air fed to the said diving workers.

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