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Minnesota Department of Labor and Industry

Minnesota Special Application guidelines

Minnesota Special Application (PDF)

The Minnesota Special program is for boilers and pressure vessels that are already in service that were not built to the ASME Code and or registered with the National Board. This process will not be used for the construction of new vessels.

Consider this process the same as the construction of a new vessel. If a Code requirement must be addressed for a new vessel then it must be addressed for a Minnesota Special.

  1. ASME Construction Code

    1. Use the latest edition adopted by the state of Minnesota

    2. Use the proper Section of the Code

      1. Section I (Power Boilers)

      2. Section IV (Heating Boilers)

      3. Section VIII (Unfired pressure vessels)

  2. Hold Points that a State inspector may set (This is not meant to be an all inclusive list).

    1. Confirmation of material (As addressed by the Code)

      1. Through stamping found on material

      2. Through use of Metal analyzer

    2. Drawings (As addressed by the Code)

      1. Material thickness (all parts)

      2. Dimensions (will vary with type of vessel)

        1. Overall

        2. Openings

        3. Attachments

        4. Type of heads

        5. Nozzles

        6. Manways/handholes

        7. Weld sizes

    3. calculations (As addressed by the Code)

      1. All required by the Code

    4. Other Code requirements

    5. Pressure Test (As addressed by the Code)

      1. Witness hydrostatic test.

    6. Assign Minnesota Special number

    7. Witness attachment of data plate

Joel T. Amato
Chief Boiler Inspector
March 25, 2004

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