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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 II. Boilers

Section 1. Manufacturing

(Permission for Manufacturing)
  1. Article 3. A person who is to manufacture boilers (excluding small-sized boilers, hereinafter the same in this Chapter) shall obtain in advance permission from the Director General of the Prefectural Labour Bureau which exercises jurisdiction over the area where the workplace is located (hereinafter referred to as the "Director General of the competent Prefectural Labour Bureau?h), for the boilers concerned. However, this provision shall not be applied to boilers similar in model to those which have already been permitted for manufacturing (hereinafter referred to as "permitted model boilers").
  2. A person who is to obtain the permission specified by the preceding paragraph shall submit an Application of Permission for Manufacturing of Boiler (Form No.1) together with drawings showing the construction of the boilers concerned and documents stating the following items to the Director General of the competent Prefectural Labour Bureau:
    1. Strength calculation.
    2. Kinds, capacity and number of the equipment used for manufacture and inspection of boilers.
    3. Outline of personal history of the person responsible for workmanship
    4. Qualification and number of the workers who are to be engaged in the actual fabricating work of boilers.
    5. In the case of manufacturing the boilers by welding, the results of welding procedure tests.
(Report of Changes)

Article 4. In the case of manufacturing the boiler which was granted the permission as provided for by paragraph 1 of the preceding Article or the permitted model boiler, when a person who has been granted the said permission changes the equipment as described in item 2 of paragraph 2 of the said Article or the person responsible for workmanship as described in item 3 of the same paragraph, he shall submit a report on the changes concerned without delay to the Director Generalof the competent Prefectural Labour Bureau.

(Shop Inspection)
  1. Article 5. A person who has manufactured a boiler shall have the said boiler inspected by the Director General of the competent Prefectural Labour Bureau (for sectional boilers, by the Director General of the Prefectural Labour Bureau which exercises jurisdiction over the area where the boiler is to be installed, hereinafter the same in this Article) under the provision of paragraph 1 of Article 38 of the Industrial Safety and Health Law (hereinafter referred to as the "Law"). However, this provision shall not apply to those boilers that use high-temperature gas, instead of fire, for heating (called ?gwaste-heat boilers in item 2 of paragraph 2 of Article 24) which fall under the category of specified facilities in paragraph 1 of Article 56-3 of the High Pressure Gas Control Law (Law No. 204 of 1951) (called ?gspecified waste-heat boilers?h below) that have already been inspected by an authorized agency for inspection at time of manufacture, etc., under paragraph 1 of Article 38 of the Law (called ?gauthorized agency for inspection at time of manufacture, etc.,?h below.)
  2. Any boiler fabricated by welding shall not be permitted to go through an inspection by the Director General of the competent Prefectural Labour Bureau or by the authorized agency for inspection at time of manufacture etc., under the provisions of the preceding paragraph (hereinafter referred to as the "shop inspection" in this Chapter) before such boiler is found acceptable by the inspection set forth in paragraph 1 of Article 7.
  3. Any person who wants to receive a shop inspection shall submit an Application for Shop Inspection of Boiler (Form No.2) together with a boiler specification (Form No.3) to the person who performs the shop inspection (hereinafter called the "shop inspector").
  4. The shop inspector shall stamp a mark (Form No. 4) on the body of the boiler which passed the shop inspection and affix a seal "passed the shop inspection" (Form No.5) on the boiler specification concerned and grant the said specification to the applicant.
  5. The Director General of the competent Prefectural Labour Bureau shall issue an inspection certificate (Form No.6) to the applicant in respect of a mobile boiler which passed the shop inspection.
(Measures to Be Taken When Undergoing a Shop Inspection)
  1. Article 6. A person who undergoes a shop inspection shall perform the following matters:
    1. Place a boiler at a position where it can be easily inspected.
    2. Prepare for the hydrostatic pressure test.
    3. Arrange safety valves (for the hot water boiler, relief valve, hereinafter the same in this Chapter) and water gauges (only limited to the inspection of steam boilers which is required to measure the water level).
  2. The Director General of the Prefectural Labour Bureau may order the following matters to the applicant of shop inspection, when it is deemed necessary in the operation of the said inspection:
    1. To remove all or part of covering materials of boiler.
    2. To draw tubes or rivets, or to put a hole in plates or tubes.
    3. For the cast iron boiler, to dismember in sections.
    4. Other matters deemed necessary.
  3. A person who undergoes a shop inspection shall be present at the said inspection.
(Welding Inspection)
  1. Article 7. A person who is to weld a boiler which is to be fabricated by welding shall have the said boiler inspected by the Director General of the competent Prefectural Labour Bureau under the provision of paragraph 1 of Article 38 of the Law. However, this provision does not apply where the said boiler has been welded only in its attachments (including only the superheater and economizer, hereinafter the same in this Chapter) or in those parts which are not subject to exposure to any stress, other than compressive stress, where such a boiler is a once-through boiler (excluding those which have a steam separator) or where it is a specified waste-heat boiler which has been inspected by an authorized agency for inspection at time of manufacture, etc.
  2. Any person who wants to receive an inspection by the Director General of the competent Prefectural Labour Bureau or by an authorized agency for inspection at time of manufacture, etc., under the provisions of the preceding paragraph (hereinafter referred to as "welding inspection" in this Chapter) shall, before starting to weld the boiler to be inspected, submit an Application for Welding Inspection of Boiler (Form No.7) together with a boiler welding specification (Form No.8) to a person who performs welding inspections (called the "welding inspector" below).
  3. 3. The welding inspector shall stamp a mark (Form No. 9) on the body of boiler which passed the welding inspection, and affix a seal "passed the welding inspection" (Form No.10) of the boiler welding specification and grant the said specification to the applicant.

(Measures to Be Taken When Undergoing Welding Inspection)

  1. Article 8. A person who undergoes a welding inspection shall perform the following matters:
    1. Make the test pieces for mechanical tests.
    2. Prepare for radiographic examinations.
  2. A person who undergoes a welding inspection shall be present at the said inspection.
(Limitation of Placement)

Article 9. The employer shall place no person in boiler welding operations from among the operations as set forth in item 4 of Article 20 of the Cabinet Order except one who has obtained a license of special class boiler welder (hereinafter referred to as "special boiler welder"). However, in relation to operations in which the thickness of the welding part is not over 25 mm, or welding is applied for connection of nozzles, flanges, etc., the employer may place one who has obtained a license of ordinary class boiler welder (hereinafter referred to as "ordinary boiler welder") in the said operation.

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