[abstract] ON-LINE COMPUTATION OF DECOMPRESSION SCHEDULES FOR SINGLE INERT GAS-OXYGEN DIVES USING A SMALL PROGRAMMABLE CALCULATOR.

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[abstract] ON-LINE COMPUTATION OF DECOMPRESSION SCHEDULES FOR SINGLE INERT GAS-OXYGEN DIVES USING A SMALL PROGRAMMABLE CALCULATOR.

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Title: [abstract] ON-LINE COMPUTATION OF DECOMPRESSION SCHEDULES FOR SINGLE INERT GAS-OXYGEN DIVES USING A SMALL PROGRAMMABLE CALCULATOR.
Author: Renade, A; Peterson, RE
Abstract: An algorithm for on-site computation of single-inert-gas decompression schedules, based on the Workman model, for small programmable calculators (TI-59, Texas Instruments) is described. The program has 457 steps and uses 60 data registers. A 10-compartment model with Workman's half times and M values for nitrogen data was used to generate standard decompression tables for bottom depths of 60-180 fsw and bottom times ranging from 5 to 120 min. These compare well with the standard US Navy diving tables. An important feature of this program is that it permits computation of optimum safe decompression with any desired changes in the oxygen content of the breathing mixture and extension of the stay at any decompression stop. Traditionally, if the actual stay at any stop is extended, for operational or other reasons, beyond that dictated by the decompression table being followed, a different schedule for a longer bottom time is chosen, resulting in unnecessarily long decompression. This program can take such departures from the predetermined decompression schedules into account. The portability of small calculators and the flexibility of being able to generate special purpose decompression profiles make this program very suitable for interactive real-time applications. The reliability of the decompression schedules generated depends entirely on the reliability of the half-time and M-value parameters. The Workman M values for air dives were derived from field-tested US Navy decompression data. In principle, this algorithm could be used to calculate helium-oxygen decompression schedules, provided that suitable helium values determined from field data were used. Copies of the source program will be available and a demonstration of the computation will be presented.
URI: http://archive.rubicon-foundation.org/4541
Date: 1979

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  • UHMS Meeting Abstracts
    This is a collection of the published abstracts from the Undersea and Hyperbaric Medical Society (UHMS) annual meetings.

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