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Ordinance on Safety of Boilers and Pressure Vessels
Ministry of Labour Ordinance No.33 of September 30, 1972

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

Chapter III. First Class Pressure Vessels

Section 3. Management

(Appointment of an Operations Chief of Work Handling First Class Pressure Vessels)
  1. Article 62. The employer shall appoint an operations chief of work handling first class pressure vessels from among those who have completed the skill training course for operations chiefs of work handling first class pressure vessels related to chemical facilities in the case of work handling first class pressure vessels related to chemical facilities (chemical facilities shall be defined as those set forth in item 4 of paragraph 1 of Article 15 of the Cabinet Order, hereinafter the same) from among the types of work as described in item 17 of Article 6 of the Cabinet Order, and from among special class boiler operators, first class boiler operators, second class boiler operators or those who have completed the skill training course for operations chiefs of work handling first class pressure vessels related to chemical facilities or the skill training course for operations chiefs of work handling ordinary first class pressure vessels in the case of types of work other than the work handling first class pressure vessels related to chemical facilities from among the types of work set forth in item 17 of the Cabinet Order, respectively.
  2. Notwithstanding the provisions of the preceding paragraph, the employer shall, with regard to those jobs set forth in item 17 of Article 6 of the Cabinet Order which are related to any of the first class pressure vessels under the Electric Utility Law (Law No.170 of 1964), the High Pressure Gas Safety Law or the Gas Utility Law (Law No.51 of 1954), appoint an operations chief of work handling first class pressure vessels from among those who have obtained a license of operations chief of work handling specified first class pressure vessels (for the work handling first class pressure vessels related to chemical facilities from among the said types of work, only limited to those who are described in item 2 or 3 of paragraph 1 of Article 119 and have obtained a license of operations chief of work handling specified first class pressure vessel).
(Duties of an Operations Chief of Work Handling First Class Pressure Vessels)

Article 63. The employer shall have an operations chief of work handling first class pressure vessels perform the following matters:

  1. Refrain from raising pressure over the maximum allowable working pressure.
  2. Maintain the function of safety valves.
  3. When first operating a first class pressure vessel, or changing the operating methods or the kind of materials to be handled in the said first class pressure vessel, have the workers in advance know well the procedures of the said operation and superintend the said operation directly.
  4. Take necessary measures immediately, if any abnormality is found concerning a first class pressure vessel or its piping.
  5. Check the condition of temperature, pressure, etc., in a first class pressure vessel at any time, and take necessary measures, if any abnormality is found.
  6. Record the necessary matters regarding the operating conditions of facilities related to first class pressure vessels and guarantee that they are transferred to the next shift.
(Prohibition of Use)

Article 64. The employer shall not use a first class pressure vessel which is not in conformity with the standards (only limited to the parts related to the construction of first class pressure vessels) as provided for by the Minister of Health, Labour and Welfare on the basis of the provision of paragraph 2 of Article 37 of the Law.

(Management of Fittings)
  1. Article 65. The employer shall, with regard to the management of safety valve and other fittings of first class pressure vessel, perform the following matters:
    1. Adjust safety valves to let them operate at the maximum allowable working pressure or lower.
    2. With regard to a pressure gauge, prevent vibration from hindering its function, and take necessary measures to prevent their insides from freezing and also to maintain the temperature less than 80 degrees.
    3. With regard to the dials of pressure gauges, put up easily visible indications at the position showing the maximum allowable working pressure of the first class pressure vessel concerned.
  2. When two or more safety valves are provided, and one of them is adjusted in order to operate at the maximum allowable working pressure or lower, the employer may, notwithstanding the provision of item 1 of the preceding paragraph, adjust other safety valves to let them operate at the pressure three percent over the maximum allowable working pressure or lower.
(Indication)

Article 66. The employer shall put up the name(s) of an operations chief(s) of work handling first class pressure vessels at an easily visible location in the place where the first class pressure vessel is installed.

(Periodical Voluntary Inspection)
  1. Article 67. With regard to a first class pressure vessel, the employer shall implement voluntary inspection, periodically, and at least once for every period not exceeding one month after the commencement of operation, on the following matters, provided that this provision shall not apply to a non-use period of first class pressure vessels which are not used for a period exceeding one month:
    1. Existence of damage to the vessel itself.
    2. Existence of wear in the locking bolts of cover plate.
    3. Existence of damage in the tubes or valves.
  2. With regard to the first class pressure vessels as described in the proviso of the preceding paragraph, the employer shall, before the resumption of use, implement voluntary inspection on the matter as described in each item of the same paragraph.
  3. When having implemented the voluntary inspections as set forth by the preceding two paragraphs, the employer shall record their results and preserve such records for three years.
(Repairs, etc.)

Article 68. In the event that any abnormality has been found as the result of the voluntary inspection as set forth by paragraph 1 or 2 of the preceding Article, the employer shall take such necessary measures as repairs, etc.

(Measures to Be Taken When Entering the Inside of a First Class Pressure Vessel)

Article 69. When the employer has a worker enter a first class pressure vessel in order to perform cleaning, repairs, etc., the employer shall take the following measures:

  1. Cool the first class pressure vessel.
  2. Ventilate the inside of the first class pressure vessel.
  3. With regard to the mobile electric wires used in first class pressure vessel, use cabtire cable or one having the same or more insulating effect and strength, and for the mobile electric light, use one provided with a guard.
  4. Shut off securely the valve connections between boilers in operation and other pressure vessels.
(Limitation of Placement)

Article 70. The employer shall place no person in the maintenance work of first class pressure vessels from among the types of work as set forth in item 5 of Article 20 of the Cabinet Order except one who has obtained a license of boiler maintenance worker.

Article 71. Deleted.

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