This article informs about the letter sent from Red-Bag to the ASME B31.3 committee subgroup materials SG-D.

Dear Sirs,

Red-Bag is software solution provider for mechanical calculations in the process industry. One of our applications includes the internal and external pressure calculations as per ASME B31.3 2020.

We are using the metric material tables such as Table A-1M. Our material database has been changed recently from the US customary units to the Metric units. However, we find some discrepancies if we compare the tables for the different units. Attached your will find some of the discrepancies.

Our question is: can we use the Metric tables as the leading tables?

We are very pleased with the work of the committee for the ASME B31.3 and regard it is a high-quality standard. Our customers require clear results and expect quality calculations from our software. We will be pleased to contribute our findings and proposals with the committee.

Kind regards,

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Example of differences between ASME B31.3 Table A-1 and Table A-1M:

Refer ASME B31.3 book paper page 167 (pdf page 194) in table A-1 versus paper pages 242-243 (pdf pages 269-270) in table A-1M:

  • Material A47 has grade 22019 in table A-1M and grade 32510 in in table A-1
  • All materials A48 have a different grade in table A-1M then in table A-1
  • Material A48 225 exists in table A-1M, but not in table A-1
  • Material A48 325 exists in table A-1M, but not in table A-1
  • Material A48 375 exists in table A-1M, but not in table A-1
  • Material A278 225 exists in table A-1M, but not in table A-1
  • Material A278 325 exists in table A-1M, but not in table A-1

Refer ASME B31.3 book paper pages 188-209 (pdf pages 215-236) in table A-1 versus paper pages 262-297 (pdf pages 289-324) in table A-1M:

  • Material A182 F60 exists in table A-1, but not in table A-1M
  • Material A240 2205 exists in table A-1, but not in table A-1M
  • Material A479 S32205 exists in table A-1, but not in table A-1M
  • Material A789 2205 exists in table A-1, but not in table A-1M
  • Material A790 2205 exists in table A-1, but not in table A-1M
  • Material A815 WPS32205 exists in table A-1, but not in table A-1M

Refer ASME B31.3 book paper pages 216-231 (pdf pages 243-258) in table A-1 versus paper pages 304-331 (pdf pages 331-358) in table A-1M:

  • Material B564 N02200 exists in table A-1M, but not in table A-1