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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 I.  General Provisions

(Definitions)

Article 1.  In this Ministry of Health, Labour and Welfare Ordinance, the meanings or significances of the terms or words given below are as defined in their respective items below:

  1. "Work in compressed air" shall be defined as that work related to the indoor work set forth in item 1 of Article 6 of the Enforcement Order of Industrial Safety and Health Law (Cabinet Order No. 318 of 1972, hereinafter called the "Cabinet Order").
  2. "Diving operations" shall be defined as the types of work set forth in item 9 of Article 20 of the Cabinet Order.
  3. "A work chamber" shall be defined as a chamber under barometric pressure levels which are higher than atmospheric pressure for performance of work involving operations using the caisson method and other compressed air methods.
  4. "Man-lock" (Air lock chamber) shall be defined as a room in which workers who are engaged in work in compressed air (hereinafter called "compressed air workers") are depressurized or pressurized due to pressure levels within the room. 
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