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Nitrox
Diver
As it relates to the PDIC
recreational SCUBA diver, Nitrox is best described as oxygen (O2)
enriched air containing between 22% and 40% oxygen. Air is comprised of
approximately 21% oxygen and 78% nitrogen with the remaining 1% being
trace amounts of several other gases. As with all recreational SCUBA
diving activities, the 130 foot/no-decompression diving rule applies.
By breathing Nitrox a typical
diver will take up less nitrogen (N2) on a given dive, therefore
lowering his/her risk of decompression sickness. An additional benefit
of Nitrox is the reduced effect of nitrogen narcosis. While diving to
depths below 80 feet or so, the nitrogen partial pressure will be less
than a comparable air dive, thereby reducing the effects of nitrogen at
deeper depths (80-130 foot range).
After a given dive the residual
nitrogen levels will be lower than a comparable air dive, which in turn
will increase available bottom time on repetitive dives, decrease your
surface interval, or both. This also reduces the risk of flying after
diving.
The PDIC Nitrox diver
certification is a means to allow a preciously certified SCUBA diver the
ability to purchase and use Nitrox breathing gas. A PDIC Nitrox diver
has successfully completed the necessary study materials and exam to
intelligently and responsibly use Nitrox. PDIC Nitrox is always a mix of
between 22% and 40% oxygen used within the recreational depth limit of
130 fsw.
PDIC adheres to the concept that
Nitrox mixes up to 40% content may be used in equipment which has not
been cleaned for oxygen service. PDIC maintains that because a SCUBA
cylinder may see pure oxygen service from time to time that the cylinder
and the cylinder valve should be cleaned for oxygen service and be
oxygen compatible. It should be emphasized that this position follows
the Nitrox community and NOAA policies. PDIC recognizes that in the
SCUBA environment, certain dangers associated with using oxygen (such as
self-ignition or auto-ignition of oxygen mixtures) are limited at best.
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