Backmounted doubles were created in response to problems with single orifice and backmounted independences. Independents consist of two cylinders, each with its own regulator. The diver could only use one cylinder if a first stage failed. Single orifice duals consisted of two cylinders linked by a valve. One regulator was used for the first stage. The gas would not be released if the first stage failed due to a failure of one orifice doubles. Both of these problems have been eliminated by today's isolated manifold duplicates. Each cylinder is capable of being worked separately, but the diver can use one regulator to allow him or her to inhale gas directly from both cylinders. This type of doubles is usually held together using metal bands. Additionally, the valves are linked by an isolation manifold which allows the two to be separated as needed. Backmounted doubles diving looks similar to regular single cylinder backmounts, but it has a profile that is vertically identical.
If you're a Tec diver and want to do sidemount diving, it's important to know how to set up your new rig, adjust it, enter the water with it, and much more.
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The benefits of rebreathers include the ability to extend your diving time by avoiding large cylinders and instead recycling the gas exhaled from the diver. They also scrub the CO2 out of the air and inject prescriptive amounts gas from smaller cylinders. This can significantly increase your dive time, especially for deep dives. The configuration of the rebreathers will determine the shape they create. They can be either sidemounted or back.
Your Sidemount rig also includes clips and tank bands. These clips will attach to your harness. Again, their location is crucial for the positioning of your tanks.
Decompression divers employ oxygen mixtures of all kinds to extend their time looking at wrecks and reefs on the ocean floor. While the sport diver may get two 15 minute bottom time dives at 100ft the decompression diver can cruise around for 60 minutes or more, getting the most bang for their buck.
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I will admit my Sidemount Diver course was probably one of the most challenging courses I have ever done. Mind you, this was mainly because my trusted dive center in Koh Tao, Big Blue Tech, and my instructor Fiona included a lot more skills and dives as part of my course than required. While always making sure that my task load was manageable we practiced skills over and over again and included things like mask removable, tank removable underwater, SMB deployment, out of air drills, and many more all while staying (or at least trying to) in perfect trim.
Technical diving is on the rise and Girls That Scuba HQ was quick to notice it! There were many questions to be answered and nerves to overcome so we decided to seek out Theresia, an Asian tech instructor. She is currently working at Blue Marlin Gili T, Lombok. She provided an introduction course in twin sets, and allowed us to dive into technical diving. Here's her lesson:
Sidemount diving is easy with an Open Water Diver. You will need to be able to handle your equipment yourself. Sidemount diving adds a new dimension in terms of equipment setup and skill.
To extend their time at the wrecks and reefs below the ocean floor, decompression divers use oxygen mixtures. Decompression divers can cruise around the ocean floor for as long as 60 minutes, whereas sport divers may only be able to do two bottom dives at 100ft for 15 minutes each.
Academics – The academic parts of technical courses are similar to any other class in scuba diving. Students will learn from their instructors and do some self-study. Technical courses require a lot more planning than most people are familiar with, but they are crucial to a successful dive. Gas management will be a more involved part of overhead and decompression dives than many divers are used. The computer program calculates the required gas volumes and reserves for each dive.
This scuba diving course is also offered by another agency, PADI tec sidemount diving.
Sidemount Diver is one of the most challenging courses that I have ever completed. It was because Big Blue Tech, my trusted dive shop in Koh Tai, and Fiona my instructor included many more skills and dives to my course than necessary. Although we made sure my task load was manageable, we still practiced skills. These included tank removal underwater, mask removable, out-of air drills, SMB deployment, and many other things while maintaining (or trying to maintain) perfect trim.
According to experts, approximately 40% of technical divers enroll in additional education and training programs. This yields a reasonable estimate of approximately 160,000 active technical divers worldwide.
from 170 to 350 feet
While conventional scuba diving has a recommended maximum depth of 130 feet, technical divers may work at depths ranging from 170 feet to 350 feet, and sometimes even deeper.
The depth range of oxygen rebreathers (simple closed circuit) is limited to approximately 6 m, beyond which the risk of acute oxygen toxicity rises to unacceptable levels very quickly.