Rated Flange Information

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Last updated: Dec 28, 2023 by Tiradej Bunyarattaphantu
4 min read

Last Updated: 2023.12

Reference Notes

These notes are not currently used to restrict the design; they are provided for your information.

The reference is drawn from the selected Section VIII, Division 1 or Division 2 edition/addenda based on the rated flange size. Table U-3 (Division 1) and Table 1.1 (Division 2) dictate the referenced standard and year. However, it is common for newer B16.5 and B16.47 publications to be the year of reference for a given contract even if it is not the year in the construction code table mentioned above.

If the reference is to be based on Table U-3 or Table 1.1, it is determined as follows:

  • Reference is B16.5 2003 - Size ≤ 24"; 2010 edition

  • Reference is B16.5 2009 - Size ≤ 24"; 2011 addenda or 2013 edition

  • Reference is B16.5 2013 - Size ≤ 24"; 2015 edition or 2017 edition or 2019 edition

  • Reference is B16.5 2017 - Size ≤ 24"; 2021 edition
  • Reference is B16.5 2020 - Size ≤ 24"; 2023 edition

  • Reference is B16.47 1996 - Size > 24"; 2010 edition

  • Reference is B16.47 2006 - Size > 24"; 2011 addenda

  • Reference is B16.47 2011 - Size > 24"; 2013 edition or 2015 edition or 2017 edition

  • Reference is B16.47 2017 - Size > 24"; 2019 edition or 2021 edition

  • Reference is B16.47 2020 - Size > 24"; 2023 edition

If the reference is to be based on direct reference, it is determined as follows:

  • Reference is B16.5 2003 - Size ≤ 24"; B16.5 Reference selection is 2003

  • Reference is B16.5 2009 - Size ≤ 24"; B16.5 Reference selection is 2009

  • Reference is B16.5 2013 - Size ≤ 24"; B16.5 Reference selection is 2013

  • Reference is B16.5 2017 - Size ≤ 24"; B16.5 Reference selection is 2017

  • Reference is B16.5 2020 - Size ≤ 24"; B16.5 Reference selection is 2020

  • Reference is B16.47 1996 - Size > 24"; B16.47 Reference selection is 1996

  • Reference is B16.47 2006 - Size > 24"; B16.47 Reference selection is 2006

  • Reference is B16.47 2011 - Size > 24"; B16.47 Reference selection is 2011

  • Reference is B16.47 2017 - Size > 24"; B16.47 Reference selection is 2017

  • Reference is B16.47 2020 - Size > 24"; B16.47 Reference selection is 2020


Flange Type

The selected flange type limits other aspects of the design. The software does not limit the choices in the size and class fields based on that selected in the flange field, though, so if a combination is selected that does not have a reference, the design will be given a status of failed.

Slip On

  • NPS 1/2" to 3-1/2" for Class 400 are dual rated for Class 600
  • NPS 1/2" to 2-1/2" for Class 900 are dual rated for Class 1500
  • Limited to NPS 2-1/2” for Class 1500
  • Do not have data for Class 2500

Socket Welding

  • Limited to the NPS range of ½” to 3” for Class 150, 300
  • Do not have data for Class 400 flanges
  • Limited to the NPS range of ½” to 3” for Class 600
  • Do not have data for Class 900 flanges
  • Limited to the NPS range of ½” to 2-1/2” for Class 1500
  • Do not have data for Class 2500

Threaded

  • NPS 1/2" to 3-1/2" for Class 400 are dual rated for Class 600
  • NPS 1/2" to 2-1/2" for Class 900 are dual rated for Class 1500
  • Limited to NPS 2-1/2” for Class 1500 and 2500

Lapped

  • NPS 1/2" to 3-1/2" for Class 400 are dual rated for Class 600
  • NPS 1/2" to 2-1/2" for Class 900 are dual rated for Class 1500

Blind/Weld Neck

  • NPS 1/2" to 3-1/2" for Class 400 are dual rated for Class 600
  • NPS 1/2" to 2-1/2" for Class 900 are dual rated for Class 1500
  • Series A
    • Limited to Classes 150 to 900
    • Limited to 26” to 60” for classes 150, 300, 400, and 600
    • Limited to 26” to 48” for class 900
  • Series B
    • Limited to Classes 75 to 900
    • Limited to 26” to 60” for classes 150 and 300
    • Limited to 26” to 36” for classes 400, 600, and 900

Material Group

Material Group assignment is not dependent on units of measure; it has been normalized across B16.5 2003, 2009, 2013 and 2020 and B16.47 1996, 2006, 2011, 2017, and 2020. Material Group and ASME Class are taken together to determine the pressure/temperature ratings. The material group is assigned automatically and cannot be changed.

  • B16.47 1996 only uses customary units.
  • B16.5 2003, 2009, 2013, 2017 and 2020 and B16.47 2006, 2011, 2017 and 2020 have both customary and metric units.
  • B16.5 includes material groups for 3.X, but B16.47 does not.

ASME Class

ASME Class is taken together with Material Group to determine the pressure/temperature ratings. The classes covered by the software have differences in coverage.

  • B16.5 includes flange classes 1500 and 2500 (B16.47 does not).
  • B16.47 includes flange class 75 (B16.5 does not).
  • Both B16.5 and B16.47 include flange classes 150, 300, 400, 600, and 900.
  • Class 75 is only for Series B Blind and Weldneck rated flanges.
  • Class 75 is only for NPS 24" to NPS 60".
  • Class 900 and up do not have data for NPS 3 -1/2”.
  • Class 400 has data starting at NPS 4”. Smaller NPS Class 400 flanges are dual rated with Class 600.
  • Class 900 has data starting at NPS 3”. Smaller NPS Class 900 flanges are dual rated with Class 1500.
  • Class 1500 has data up NPS 24”.
  • Class 2500 has data up to NPS 12”.


Errata

Note that the 2013 edition of B16.5 corrected the Forgings SB 479 designation for Material Group 3.11 to be SA 479.