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Date: Tue, 16 Jul 1996 18:34:10 -0700 (PDT)
From: "Peter N.R. Heseltine" <heseltin@hs*.us*.ed*>
To: Dave Eaton <ski@dc*.dn*.ca*>
cc: techdiver@terra.net
Subject: AAUS limits pPO2 to 1.44 (with some exceptions)

The following is taken from an online version of the

UNIVERSITY OF CALIFORNIA, DAVIS
DIVING SAFETY MANUAL

(URL: http://www.kerr.orst.edu:70/0/subjecti/gnrlrf/dive/)

FORWARD

This DIVING SAFETY MANUAL is based upon the American Academy
of Underwater Sciences (AAUS) Standards for Scientific
Diving and Certification and Operation ofScientific
Programs, October 1990.  The AAUS document represents the
minimal safety standards for state-of-the-art scientific
diving.

 SECTION 8.2

                   ENRICHED AIR (NITROX) DIVING REGULATIONS

8.2.10   Dive Parameters

8.2.11   Dive Limitations

The dive limitations outlined below are based on the partial
pressure of oxygen that would be experienced at the maximum depth
indicated.

1.  The following limitations are to be used for diving with
    air, NOAA Nitrox-1 (32% oxygen) and NOAA Nitrox-2 (36%
    oxygen).

    Mixture                   Maximum Operating Depth (MOD)

      Air                           7.0 ATA       -    60 meters
      NOAA Nitrox-I                 4.5 ATA       -    35 meters
      NOAA Nitrox-II                4.0 ATA       -    30 meters


2.  If using the equivalent air depth (EAD) method, the maximum
    depth of a dive shall be based on the partial pressure of
    the oxygen for the specific breathing mixture to be used. The
    oxygen partial pressure experienced at depth shall not exceed
    1.45 ATAs.

3.  An exception to 8.2.11.2 is that for transit mix the partial
    pressure of oxygen shall not exceed 1.6 ATAs.  Transit mixes
    must be either diver carried in a separate, independent scuba
    system (pony bottle), or if surface supplied, come from a
    separate source cylinder.  In case of emergency, "bail out"
    gas with a maximum of 2.0 ATAs is allowed.

4.  If the dive is anticipated to be exceptionally strenuous
    and/or cold the maximum partial pressure of oxygen shall
    not exceed 1.3 ATAs.



By the way, this document is useful as a resource. The appendices have
forms for MDs to use when certifying divers, as well as a detailed
patient/diver questionaire.

Peter Heseltine

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