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Diving with Independent Twins
"Nobody ever died from having too much air..."
-- Intelligent Dive System's first customer
Traveling to dive destinations is never an easy logistical situation. Between packing
clothes, organizing dive gear, guessing which exposure suit you will need and making
sure that all gear is in working order, the traveling diver hardly has time to ship their
double tanks ahead of them.
Technical Destination Diving
Most dive destinations do not offer the rental of double tanks. Technical divers who
need the extra gas capacity of two tanks are out of luck at these limited dive operations.
Until the invention of the Independent Twins bracket system. Now, technical divers can
travel with the lightweight bracket kit and can assemble a set of doubles right there on
the dive boat. This allows the diver to enjoy the increased bottom time that can only
come from a pair of cylinders on your back.
Procedures and Logistics
Independent twins work just like a set of doubles with the isolator valve closed. The use
of two submersible pressure gauges (one for each tank) is essential to monitor both
cylinders. The regulators must also be swapped off throughout the dive. The most
common practice is to switch off every 500 psi to maintain balance and equal buoyancy
in the system. This is the easiest way to dive with the system because it keeps the
diver's attention on the isolated system of cylinders.
Independent Twins and Tec-Reational Diving
Almost all dive operations have two things in common - the aluminum 80cf tank and that
one guy who sucks down his entire tank in five minutes and makes the rest of the group
surface with 1500 psi left in their tanks. There is nothing more frustrating than reaching
a great dive site and have to leave after only a few minutes due to the lack of gas in a
single cylinder. This does not have to be the case though.
Tec-Reational Divers can extend their bottom time dramatically with independent twins
systems. Take, for example, a diver on a wreck in 100 feet of salt water. With a single
80cf cylinder of 32% Nitrox, a diver with a consumption rate of .75 cubic feet per minute
will breath down to 500 psi after only 22 minutes. That is not a lot of time to spend on
the wreck when you factor in descent time, ascent time and safety stops.
On the other hand, if the diver sets up a set of independent twins and makes the same
dive, the diver can run up against the no decompression time for the Equivalent Air
Depth END of 32% nitrox (80 feet) and spend half an hour on the wreck, not including
descent time, ascent time and safety stops. This is an increase in actual bottom time by
over fifty percent! This also keeps the diver within the recreational dive limits while
extracting maximum fun out of the dive!
So whether you are a technical or Tec-Reational diver, try out a set of independent twins
today. You will be glad that you did!
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