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Renovations in DCD tables 2015

Revision of the 1988 NDC tables (copyright DadCoDat) has been carried out, because the oldNDC tables no longer satisfy a number of issues like new insights and changed regulations. The following changes are most noticeable:

  1. Adjustments of the no-stop times on the basis of now-a-days practice.
  2. More conservative bottom times particularly for deeper and longer dives based on feedback of dive data / incidents.
  3. More emphasis on the 6 metres stop on oxygen, to better counteract bubble growth. This leads to a limited increase of OTU (formerly UPTD), but still stays sufficiently within the accepted limits.
  4. The repetitive tables are adjusted and became more conservative. Also, the 8-hours interval is omitted, because this differed only slightly from the 4-hours interval.
  5. Nitrox tables have been extended for a 35/65 mixture as well, since IMCA rules prescribe a maximal PO2 of 1.4 bar.
  6. The Air-Oxygen tables have been replaced, since these were hardly used. As a replacement, new (wet) bell tables are included and we expect these to be more important in practice.
  7. Treatment tables for decompression illness have been adjusted to now-a-days insights. Comex tables Cx12 and Cx30 are included, while US Navy table 6A has been removed.
  8. The user-manual has also been adjusted, with regards to the revisions, and is published in English.

We feel that the revised decompression tables serve a better and more reliable guidance for present day commercial diving. Hence, we recommend that these tables be used instead of the 1988 NDC tables.