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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 4. Management

(Limitation of Placement)
  1. Article 23. The employer shall place no person in the operations set forth in item 3 of Article 20 of the Cabinet Order except one who has obtained the license of special class boiler operator, the license of first class boiler operator or the license of second class boiler operator (hereinafter referred to as the "boiler operator"). However this provision shall not apply to the case provided for by Article 42 of the Safety and Health Ordinance.
  2. The employer shall, notwithstanding the provision of the text of the proceedings Article, may place one who has completed the skills training course of the operation of boilers in operations of boiler set forth in a) to d) of item 16 of Article 6 of the Cabinet Order,
(Appointment of an Operations Chief of Boilers)
  1. Article 24. The employer shall, with regard to the work set forth in item 4 of Article 6 of the Cabinet Order, appoint an operations chief of boilers from among those who are described in the following items according to the classification of work specified in the respective items:
    1. Operation of boilers in the case when the total heating surface of operating boilers is 500 m2 or more (excluding the case when only once-through boilers are operated): one who has obtained a license of special class boiler operator (hereinafter referred to as the "special class boiler operator").
    2. Operation of boilers in the case when the total heating surface of operating boilers is 25 m2 or more but less than 500 m2 (including the case when only once-through boilers are operated and their total heating surface is 500 m2 or more): special class boiler operator or one who has obtained a license of first class boiler operator (hereinafter referred to as the "first class boiler operator").
    3. Operation of boilers in the case when the total heating surface of operating boilers is less than 25 m2: special class boiler operator, first class boiler operator and one who has obtained a license of second class boiler operator (hereinafter referred to as the "second class boiler operator").
    4. Operation of boilers in the case when only boilers prescribed in a) to d) of item 16 of Article 6 of the Cabinet Order are operated: special class boiler operator, first class boiler operator, second class boiler operator and those who have completed the skill training course of the operation of boilers.
  2. The total of heating surface as prescribed in items 1 to 3 of the preceding paragraph shall be calculated as follows:
    1. In the case of a once-through boiler, the value obtained by multiplication of the heating surface by one tenth shall be the heating surface of the once-through boiler concerned.
    2. In the case of waste-heat boilers, the value obtained by multiplying the heating surface by one half shall be the heating surface of the said waste-heat boiler.
    3. In the case of boilers as prescribed in a) to d) of item 16 of Article 6 of the Cabinet Order, their heating surface shall not be included.
(Duties of an Operations Chief of Boiler)

Article 25. The employer shall have an operations chief of boilers perform the following matters:

  1. Watch the pressure, water level and situation of combustion.
  2. Do not give any sudden change of load.
  3. Do not increase pressure over the maximum allowable working pressure.
  4. Maintain the function of safety valves.
  5. Checkup the function of water gauges at least once a day.
  6. Carry out the blowoff in suitable way for prevention of concentration of boiler water.
  7. Maintain the function of water feeding devices.
  8. Checkup and adjust the low water burning cutoff device, flame detector and other automatic control devices.
  9. Take necessary measures immediately, if any abnormality is found concerning a boiler.
  10. Record the measured concentration of the exhausted smoke and the existence of abnormality in the operation of boiler.
(Prohibition of Use)

Article 26. The employer shall not use a boiler which is not in conformity with the standards (only limited to the parts related to the construction of the boiler) 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.

(Prevention of Smoke)

Article 27. The employer shall make an effort to exhaust no smoke from the installed boiler by taking necessary measures such as improvement of related facilities and combustion methods for the purpose of prevention of hazards caused by smoke exhausted from the boiler concerned.

(Management of Fittings)
  1. Article 28. The employer shall, with regard to the management of safety valve and other fittings of boiler, perform the following matters:
    1. Adjust a safety valve to let it operate at the maximum allowable working pressure or lower.
    2. Adjust a safety valve of superheater to let it operate before the operation of safety valve of drum of shell.
    3. Take necessary measures such as keeping warmth for prevention of freezing of a relief valve.
    4. With regard to a pressure gauge and a water head gauge, prevent vibration hindering their function in use, and take necessary measures to prevent their insides from freezing and also to maintain the temperature less than 80 degrees.
    5. With regard to dials of pressure gauges or water head gauges, put up easily visible indications at the position showing the maximum allowable working pressure of the boiler concerned.
    6. Indicate the ordinary water level at a water gauge or other positions near the said gauge to be able to compare to the actual water level.
    7. Protect water feeding pipes, blow pipes and connecting pipes of water gauges those which are in contact with burning gas using heatproof material.
    8. Take necessary measures such as maintaining warmth for prevention of freezing of the return pipes of hot water boiler.
  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 a pressure three percent over the maximum allowable working pressure or lower.
(Management of Boiler Rooms, etc.)

Article 29. The employer shall, with regard to the management of boiler rooms, etc., perform the following matters:

  1. Prohibit persons other than those concerned from entering a boiler room or other places where a boiler is installed without permission, and indicate that fact at an easily visible location.
  2. Have the workers carry no inflammable substance into a boiler room, except those necessary for use.
  3. Provide glass tubes for water gauges, gaskets and other necessary spare stores and tools for repairing in a boiler room.
  4. Put up a boiler inspection certificate, and qualification and name(s) of the operations chief(s) of boilers at an easily visible position of a boiler room of other places where a boiler is installed.
  5. With regard to a mobile boiler, have the operation chief of boilers hold a boiler inspection certificate or its copy.
  6. When any crack is found in the bricks of a combustion chamber, flue, etc., or any interstice is found between a boiler body and laid bricks, repair them immediately.
(Ignition)
  1. Article 30. In performing an ignition of boiler, the employer shall not ignite unless function of damper is inspected and ventilation of combustion chamber and of inside of flue is done sufficiently.
  2. In performing an ignition of boiler, the worker shall not ignite, if it is not in conformity with the provision of the preceding paragraph.
(Blowoff)
  1. Article 31. In performing a blowoff, the employer shall observe the following matters:
    1. One person does not blowoff two or more boilers at the same time.
    2. During the blowoff, he does not perform any other operation.
  2. In performing a blowoff, the worker shall observe the matters as described in each item of the preceding paragraph.
(Periodical Voluntary Inspection)
  1. Article 32. With regard to a boiler, 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 matters shown in the right column of the following table for each item shown in the left column of the same table, provided that this provision shall not apply to a non-use period of boilers which are not used for a period exceeding one month.
    Item Matters to be inspected
    Boiler itself Existence of damage
    Burning apparatus Oil heater and fuel feeding device Existence of damage
    Burner Existence of adhesive or damage
    Strainer Existence of clogging or damage
    Burner tile and furnace wall Existence of adhesive or damage
    Stoker and fire grate Existence of damage
    Flue Existence of leakage and other damage, and existence of abnormality in draft pressure
    Automatic control systems Starting and stopping device, flame detector fuel cutoff device, water level regulator and pressure control device Existence of abnormality in function
    Electric wiring Existence of abnormality in terminals
    Attached equipment and fittings Water feeding device Existence of damage and condition of operation
    Steam pipes and their attached valves Existence of damage and condition of warmth maintenance
    Air preheater Existence of damage
    Water treatment device Existence of abnormality in function
  2. With regard to the boilers as described in the proviso of the preceding paragraph, the employer shall, before the resumption of use, implement voluntary inspection on the matters shown in the right column of the table in the same paragraph for each item shown in the left column of the same table.
  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 33. 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 Boiler or Flue)

Article 34. When the employer has a worker enter a boiler (including combustion chambers, hereinafter the same in this Article) or flue in order to perform cleaning, repairs, etc., the employer shall take the following measures:

  1. Cool boiler or flue.
  2. Ventilate the inside of boiler or flue.
  3. With regard to the mobile electric wires used in boiler or flue, 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 other boilers in operation.
(Limitation of Placement)

Article 35. The employer shall place no person in the maintenance work of boilers from among the types of work set forth in item 5 of Article 20 of the Cabinet Order except one who has obtained a license of boiler maintenance worker (hereinafter referred to as the "boiler maintenance worker").

Article 36. Deleted.

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