Or it may tell you if your planned dive isn't even possible. You should know you SAC rate in similar conditions then you can calculate the volume of air you will use at a given depth for the length of time you want to be down and that will tell you how big (or how many) tanks to bring. Tank size come into play when PLANNING a dive. This allows for a comparison of air consumption regardless of depth. You convert this volume of air used at depth to what you would have used at the surface. When you dive you consume an amount of air. Or the amount of air you consume at the surface. American Canadian Underwater CertificationsĪ lot of the answers and comments are asking about tank size.International Association of Nitrox and Technical Divers (IANTD).National Speleological Society Cave Diving Section (NSS-CDS).National Association for Cave Diving (NACD).
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