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Division 2A Systems, Equipment and Components

United Kingdom

Original text. Later amendments are not shown.

2A001

  • Anti-friction bearings and bearing systems, as follows, and components therefor:

    N.B. SEE ALSO 2A101.

    Note: 2A001 does not control balls with tolerances specified by the manufacturer in accordance with ISO 3290:2001 as grade G5 (or national equivalents) or worse.

    1. a..

      Ball bearings and solid roller bearings, having all tolerances specified by the manufacturer in accordance with ISO 492 Tolerance Class 4 or Class 2 (or national equivalents), or better, and having both ‘rings’ and ‘rolling elements’, made from monel or beryllium;

      Note: 2A001.a. does not control tapered roller bearings.

      Technical Notes:

      1.

      ‘Ring’ - annular part of a radial rolling bearing incorporating one or more raceways (ISO 5593:1997).

      2.

      ‘Rolling element’ - ball or roller which rolls between raceways (ISO 5593:1997).

    2. b..

      Not used;

    3. c..

      Active magnetic bearing systems using any of the following:

      1. 1..

        Materials with flux densities of 2,0 T or greater and yield strengths greater than 414 MPa;

      2. 2..

        All-electromagnetic 3D homopolar bias designs for actuators; or

      3. 3..

        High temperature (450 K (177 °C) and above) position sensors.

    • 2A101

  • Radial ball bearings, other than those specified in 2A001, having all tolerances specified in accordance with ISO 492 Tolerance Class 2 (or ANSI/ABMA Std 20 Tolerance Class ABEC-9 or other national equivalents), or better and having all of the following characteristics:

    1. a..

      An inner ring bore diameter between 12 mm and 50 mm;

    2. b..

      An outer ring outside diameter between 25 mm and 100 mm; and

    3. c..

      A width between 10 mm and 20 mm.

    • 2A225

  • Crucibles made of materials resistant to liquid actinide metals, as follows:

    1. a..

      Crucibles having both of the following characteristics:

      1. 1..

        A volume of between 150 cm3 and 8 000 cm3; and

      2. 2A225 a.2..

        Made of or coated with any of the following materials, or combination of the following materials, having an overall impurity level of 2 % or less by weight:

        1. a..

          Calcium fluoride (CaF2);

        2. b..

          Calcium zirconate (metazirconate) (CaZrO3);

        3. c..

          Cerium sulphide (Ce2S3);

        4. d..

          Erbium oxide (erbia) (Er2O3);

        5. e..

          Hafnium oxide (hafnia) (HfO2);

        6. f..

          Magnesium oxide (MgO);

        7. g..

          Nitrided niobium-titanium-tungsten alloy (approximately 50 % Nb, 30 %Ti, 20 % W);

        8. h..

          Yttrium oxide (yttria) (Y2O3); or

        9. i..

          Zirconium oxide (zirconia) (ZrO2);

    2. b..

      Crucibles having both of the following characteristics:

      1. 1..

        A volume of between 50 cm3 and 2 000 cm3; and

      2. 2..

        Made of or lined with tantalum, having a purity of 99,9 % or greater by weight;

    3. c..

      Crucibles having all of the following characteristics:

      1. 1..

        A volume of between 50 cm3 and 2 000 cm3;

      2. 2..

        Made of or lined with tantalum, having a purity of 98 % or greater by weight; and

      3. 3..

        Coated with tantalum carbide, nitride, boride, or any combination thereof.

    • 2A226

  • Valves having all of the following characteristics:

    1. a..

      A ‘nominal size’ of 5 mm or greater;

    2. b..

      Having a bellows seal; and

    3. c..

      Wholly made of or lined with aluminium, aluminium alloy, nickel, or nickel alloy containing more than 60 % nickel by weight.

    Technical Note:

    For valves with different inlet and outlet diameters, the ‘nominal size’ in 2A226 refers to the smallest diameter.

    1. Division