The XR revolution continues.
Now with twin tank diving becoming popular again, the benefits are huge.
The versatility of using two tanks is enormous, not just for deep, technical divers alone but for those diving within recreational limits meaning-
Look at the safety aspect first-
Any dive from shallow to much deeper depths, twin tanking diving is safer due to the inherent setup of the equipment.
For example, just like single tank diving, the configuration has;
two regulators- One primary and an alternate octopus second stage,
One low pressure inflator
One submersible pressure gauge.
Initially the ‘twin tanks’ are configured as essentially one tank.
Redundancy within the equipment configuration
Should a regulator, pressure gauge or low pressure inflator fail, this piece of equipment can be easily switched off, unlike a single tank setup which would switch off all the air, hence the diver would be out of air.
With twin tanks all the gas is still available for the remaining equipment, that is still functioning.
Self reliance with equipment failures
The diver also has a self reliance status with failures without needing buddy assistance.
More options are available to the diver in an emergency, with minimal training, hence a safer dive.
With a twin tank system, a backplate and wing is used.
This is new to most divers but almost all who use a backplate and wing buoyancy device for the first time never return to a BCD. The backplate and wing configuration is more comfortable with no air squeezing the torso, this configuration holds the diver in a natural horizontal position, the ideal position for diving.
As with most single tank divers, someone may come along looking for extra air, if they have not managed their gas system properly, with the long hose, you donate your primary and go to your alternate regulator, usually located directly below your mouth. The long hose allows you extra space to move and greater egress form within tight spaces as divers follow single file instead of side by side.
Consider some gas management benefits.
A single tank diver takes two 12 litre tanks where as a twin tank diver, will also take two twelve litre tanks but linked together in the twin tank configuration.
It goes like this- both divers take two tanks however, upon surfacing from the first dive- the single tank diver will replace his tank with the new one, leaving the remaining gas (say 50 bar) in the old tank on the boat during the second dive.
The twin tank diver doesn’t have to do anything then takes the remaining gas from the first dive along on the second dive, meaning more gas (in this example 600 litres extra).
But there is more- A diver using twin tanks typically has more gas. Simple as that.
A twin tank system doesn’t have to be big and heavy. It could be twin 8 litre tanks compared to a single 12 litre system giving you an extra 4 litres of capacity. If your tanks are filled to 200 bar, this gives the diver an extra 800 litres of breathing gas.
More gas means safer diving and perhaps a longer bottom time, which relates more diving for your dollar!
Improved positioning in the water
Finally although a single tank system can be configured with a wing system for buoyancy control most people use a BCD.