What is a SCR rebreather?

A semi-closed circuit rebreather (SCR) is very similar to a CCR but operates with an overpressure relief valve to vent gas in maintaining ambient pressure in the loop. A metering valve is necessary to assess metabolic oxygen consumption and breathing gas injection rates.

Do you have to decompress with a rebreather?

The more sophisticated rebreathers constantly monitor the partial pressure of oxygen in your breathing mix. They can keep your PPO2 constant regardless of depth or exertion, or alter it on the fly for needs like decompression.

How long can you survive with a rebreather?

Oxygen exposure limits are laid down by NOAA and according to their Exposure Limits dive duration at the default setpoint of 1.3 bar is limited to 3 hours (or 3 1/2 hours per day). This will vary if a different setpoint is selected.

What is rebreather used for?

A rebreather is a breathing apparatus that absorbs the carbon dioxide of a user’s exhaled breath to permit the rebreathing (recycling) of the substantially unused oxygen content, and unused inert content when present, of each breath.

What is SCR diving?

When you know your SCR in cubic feet per minute, it’s possible to estimate how long a tank will last you at a given depth. Many divers routinely check their surface consumption rate (SCR) in psi, which is a good measure of breathing efficiency.

What is a semi-closed circuit rebreather?

Description. Semi-closed rebreather systems differ from their fully-closed counterparts in a number of significant ways. Instead of requiring two gas sources (oxygen and a diluent), they use only one gas source, which is Nitrox mixes of 32 percent and above.

How deep can you go with rebreather?

Those already qualified for decompression diving can immediately qualify for rebreather decompression dives. Individual training agencies limit depth to 130 to 148 feet (40 or 45 m) respectively.

How is SCR diving calculated?

Divide the total air consumed by the total time in minutes of the dive. This gives you the consumption per minute. Take the consumption per minute and multiply that by the total pressure of the average depth of your dive.