Sidemount has been around since the 1960s. It originated in the UK with sump divers. In the 70s it was adapted for the Florida caves, mainly in systems with small passages. The popularity of sidemount did not emerge until recently. More and more equipment manufactures and training organizations have embraced sidemount. The question is, “What is sidemount and why do it?”
Sidemount is a configuration which has tank is mounted alongside the diver, not on the back of the diver, a benefit while diving in a confined space such as a wreck penetration.
Sidemount use is growing with technical divers and is becoming more popular with recreational divers.
The benefits are:
Flexibility
Single
tanks are often easier to find and to transports. When diving in remote
locations, the transportation is considerably less work. Sidemount equipment is also considerably
lighter, and less bulky than back-mount rigs. A diver can also use whatever size
tank is available. Duel 40s are great
for recreational diving.
Accessibility
Sidemount
diver has direct access to, and observation of, the regulators and tank valves
of their cylinders. This allows for instant problem solving without ‘behind the
head’ shut-down drills that require a higher level of mobility, flexibility and
freedom to operate.
Streamlining
As
stated sidemount places the cylinders under the diver’s armpits, in line with
their body. This decreases resistance (improving air consumption and reducing
fatigue)and lets the diver pass through smaller restrictions, if needed. Removing
tanks and putting them in front, allows the diver to pass through very small
passages and holes when performing a penetration dive, and it is just fun to
do.
Safety
Direct
access to life-support equipment (regulators, first-stages and valves) improves
efficiency and speed of valve shut-down procedures, allows immediate identification
of problems and provides the diver with quick access to safety procedures; such
as regulator swapping (between cylinders), valve-‘feathering’ to access gas
within a cylinder whose regulator has malfunctioned or even breathing directly
from a tank valve, if you are having a really bad day.
Having
the tanks next to the diver’s body, and beneath the armpits, serves to protect valves
and regulator first-stages from collision, impact and abrasion damage, or
accidental shut-down. It also significantly reduces the risk of entanglement
behind the diver.
Comfort
Sidemount
offers greater stability, trim and control in the water. It is also less
physically demanding to carry, and get into. The ability to attach, remove and
replace cylinders while in the water allows the diver to avoid carry heavy
back-mounted doubles. As well as reduced physical exertion when conducting
regulator shut-down procedures, which is a major benefit to divers who suffer
from shoulder or back injuries that reduces mobility.
Redundancy
Increased
gas supply allows for longer dives and gas redundancy. Using nitrox and a nitrox computer allows for more no stop diving. Diver also carry their
own back up air supply. Independent tanks provide true gas redundancy.
Side Note: Monkey
diving is the term used to describe the use of a sidemount rig, using a single
cylinder. It takes a little getting used to but easy to do.I prefer it when not teaching.
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