Renovations in DCD tables 2015
Revision of the 1988 NDC tables (copyright DadCoDat) has been carried out, because the old NDC tables no longer satisfy a number of issues like new insights and changed regulations. The following changes are most noticeable :
- Adjustments of the no-stop times on the basis of now-a-days practice.
- More conservative bottom times particularly for deeper and longer dives based on feedback of dive data / incidents.
- 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.
- 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.
- Nitrox tables have been extended for a 35/65 mixture as well, since IMCA rules prescribe a maximal PO2 of 1.4 bar.
- 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.
- 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.
- 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.