Siva (rebreather)

Siva is a model series of frogman's rebreather made by Carleton Life Support originally made by Fullerton Sherwood Engineering Ltd. They are:

• Siva S10 oxygen rebreather, dive duration 4 hours. Worn on the front of the chest.
• Siva S24, usable as oxygen rebreather, or as a semi-closed circuit mixed gas rebreather with maximum depth normally 24 metres, can be set to 55 metres. Worn on the front of the chest.
• SIVA-55 (technical data, images) and SIVA PLUS: superseded by the Carleton Viper. They are worn on the back.

The Siva 55 is equipped with 2 200 bar (Inconel) spheres with a total volume of 5.6 litres.

The Siva 55 (55 metres of depth) also known as (CCDA) Canadian Clearance Diving Apparatus works with any one of 3 Nitrox mixes (32.5, 40 and 60% Oxygen) or pure oxygen. The pure oxygen is used for closed circuit diving so the diver can work without bubbles. The other Nato standard B,C and D mix are standard nitrox mixes used in semiclosed-circuit mode.

SIVA+

The SIVA +, also known as CUMA Canadian Underwater Mine-countermeasure Apparatus, is a selfmixing rebreather. It works on another principle. A constant flow of oxygen is mixed with a diluent volume dependent on the ambient pressure. The deeper the diver dives, the more diluent is added, the leaner the mix is. The correct setpoint is controlled with a partial pressure measuring device (electronic). The SIVA + is capable for diving to 90 metres. Diluent can be air, trimix or heliox.

See also

• Rebreather

External links

• Carleton Life Support homepage
• Carleton Life Support: Siva rebreathers
• Carleton rebreathers at The_rebreather_site

Underwater breathing apparatus
Surface-supplied	Bailout bottle Diver's umbilical Diving air compressor Snuba Standard diving dress
Open-circuit scuba	Alternative air supply Aqua-lung Bailout bottle Diving regulator Porpoise regulator Purge button Scuba set
Rebreathers	Carleton CDBA CDLSE Cis-Lunar Cryogenic rebreather CUMA DSEA Dolphin FROGS Halcyon PVR-BASC IDA-71 Interspiro DCSC KISS LAR-5 LAR-6 LAR-V LARU Porpoise Ray Siebe Gorman CDBA Siva Viper
Helmets and masks	Diving helmet Full-face mask
Related	Booster pump Breathing gas Breathing performance of regulators Carbon dioxide scrubber Cascade filling system Diving air compressor Diving bell Diving cylinder Gas blending Gas blending for scuba diving Hydrostatic test Nitrox production membrane method pressure-swing adsorption Oxygen compatibility Sustained load cracking Testing and inspection of diving cylinders
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