このページは国際安全衛生センターの2008/03/31以前のページです。

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 1. Manufacturing

(Permission for Manufacturing)
  1. Article 49. A person who is to manufacture first class pressure vessels (excluding small-sized pressure vessels, hereinafter the same in this Chapter) shall obtain in advance permission from the Director General of the competent Prefectural Labour Bureau for the first class pressure vessels concerned. However, this provision shall apply to the first class pressure vessels similar in model to those which have already been permitted for manufacturing (hereinafter referred to as the "permitted model first class pressure vessels").
  2. A person who is to obtain the permission specified by the preceding paragraph shall submit an Application of Permission for Manufacturing of First Class Pressure Vessel (Form No.1) together with drawings showing the construction of the first class pressure vessel 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 first class pressure vessel.
    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 first class pressure vessels.
    5. In the case of manufacturing the first class pressure vessel by welding, the result of welding procedure tests.
(Report on Change)

Article 50. In the case of manufacturing the first class pressure vessel which was granted the permission provided for by paragraph 1 of the preceding Article or a permitted model first class pressure vessel, when a person who has been granted the said permission changes the equipment as described in item 2 of paragraph 2 of the same 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 General of the competent Prefectural Labour Bureau.

(Shop Inspection)
  1. Article 51. A person who has manufactured a first class pressure vessel shall have the said first class pressure vessel inspected by the Director General of the competent Prefectural Labour Bureau (for a first class pressure vessel which is to be fabricated at the place where the said first class pressure is to be installed, by the Director General of the Prefectural Labour Bureau which exercises jurisdiction over the area where the first class pressure vessel is to be installed, hereinafter the same in this Article) under the provision of paragraph 1 of Article 38 of the Law.
  2. With reference to a first class pressure vessel which is to be fabricated by welding, a person cannot undergo the inspection as provided for by the provision of the preceding Article (hereinafter referred to as "shop inspection?h in this Chapter"), unless the said first class pressure vessel passes the inspection set forth by paragraph 1 of Article 53.
  3. A person who is to undergo a shop inspection shall submit an Application for Shop Inspection of First Class Pressure Vessel (Form No.2) together with a first class pressure vessel specification (Form No.23) to the Director General of the competent Prefectural Labour Bureau.
  4. The Director General of the competent Prefectural Labour Bureau shall stamp a mark (Form No.4) on the body of the first class pressure vessel which passed the shop inspection, and affix a seal "passed the shop inspection" (Form No.5) on the first class pressure vessel specification concerned and grant the said specification to the applicant.
(Measures to Be Taken When Undergoing a Shop Inspection)
  1. Article 52. A person who undergoes a shop inspection shall perform the following matters.
    1. Place the first class pressure vessel at a position where it can be easily inspected.
    2. Prepare for the hydrostatic pressure test.
    3. Arrange safety valves or other substitutive safety devices (hereinafter referred to as "safety valves" in this Chapter and the following Chapter).
  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 the covering materials of first class pressure vessel.
    2. To draw tubes or rivets, or to put a hole in plates or tubes.
    3. Other matters deemed necessary.
  3. 3. A person who undergoes a shop inspection shall be present at the said inspection.
(Welding Inspection)
  1. Article 53. A person who is to weld a first class pressure vessel which is to be fabricated by welding shall have the said first class pressure vessel 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 shall apply to the first class pressure vessel of which only the parts in which stresses other than compressive stress do not occur are welded.
  2. A person who is to undergo an inspection as provided for by the preceding paragraph (hereinafter referred to as the "welding inspection" in this Chapter) shall, before the commencement of the welding operation, submit an Application for Welding Inspection of First Class Pressure Vessel (Form No.7) together with a first class pressure vessel welding specification (Form No.8) to the Director General of the competent Prefectural Labour Bureau.
  3. The Director General of the competent Prefectural Labour Bureau shall stamp a mark (Form No.9) on the body of the first class pressure vessel which passed the welding inspection, and affix a seal "passed the welding inspection" (Form No.10) on the first class pressure vessel welding specification concerned and grant the said specification to the applicant.
(Measures to Be Taken When Undergoing a Welding Inspection)

Article 54. The provision of Article 8 shall apply mutatis mutandis to a welding inspection.

(Limitation of Placement)

Article 55. The employer shall place no person in first class pressure vessel welding operations from among the operations set forth in item 4 of Article 20 of the Cabinet Order except one who has obtained a license of special class boiler welder. However, in relation to the operation for which the thickness of 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 in the said operation.

このページの先頭へこのページの先頭へ