VVal-79 Maximum Permissible Tissue Tension Table for Thalmann Algorithm Support of Air Diving
Abstract
The Thalmann Algorithm parameterized with VVal-18 or VVal-18M underlies U.S. Navy air and nitrox decompression procedures. VVal-18 and VVal-18M air no-stop limits at many depths are longer than the corresponding no-stop limits in the 1957 Standard Air Decompression Table that appeared in the U.S. Navy Diving Manual from 1959 until it was replaced in Revision 6 (2008). However, the severity of DCS observed in man-trials of the longer no-stop limits was unacceptable, and consequently, in the Revision 6 Air Decompression Tables, the 1957 air no-stop limits were arbitrarily retained in place of any longer VVal-18M-prescribed limits. This report describes VVal-79, a modification of the VVal-18M parameter set, that enables use of the Thalmann Algorithm to prescribe air diving no-stop limits and decompression obligations that can be used as is, with no need for arbitrary edits to individual schedules. Crucially, the VVal-79 parameter set will also provide air no-stop limits of appropriate duration when it is used in a Thalmann Algorithm Navy Dive Computer or Thalmann Algorithm Topside Decompression Monitor. A complete set of air decompression tables computed with the VVal-79 parameters is included.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 2012
- Accession Number
- ADA561928
Entities
People
- David J. Doolette
- Wayne A. Gerth
Organizations
- United States Navy Experimental Diving Unit