CUMA
Encyclopedia
CUMA (commercially called SIVA+) is a make of rebreather
underwater breathing set designed and made in Canada for the Canadian Forces
by Fullerton Sherwood Engineering Ltd to replace the Royal Navy CDBA.
Its Carbon dioxide scrubber
, and oxygen container and diluent container (both spherical), and valves are in a backpack casing, but its breathing bag is exposed on the chest.It has the usual loop of wide corrugated breathing tube
s running from and to the top of the backpack. It has a small bailout cylinder horizontally across the bottom of the breathing bag. It can be calibrated before the dive to suit planned diving conditions.
It is a self-mixing rebreather. 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, and thus the leaner the mix is. The correct setpoint is controlled with an electronic partial pressure measuring device. The CUMA is capable for diving to 90 meters = 295 feet. Its diluent can be air or trimix or heliox
.
Its first prototype
set was made in March 1987.
Rebreather
A rebreather is a type of breathing set that provides a breathing gas containing oxygen and recycled exhaled gas. This recycling reduces the volume of breathing gas used, making a rebreather lighter and more compact than an open-circuit breathing set for the same duration in environments where...
underwater breathing set designed and made in Canada for the Canadian Forces
Canadian Forces
The Canadian Forces , officially the Canadian Armed Forces , are the unified armed forces of Canada, as constituted by the National Defence Act, which states: "The Canadian Forces are the armed forces of Her Majesty raised by Canada and consist of one Service called the Canadian Armed Forces."...
by Fullerton Sherwood Engineering Ltd to replace the Royal Navy CDBA.
Its Carbon dioxide scrubber
Carbon dioxide scrubber
A carbon dioxide scrubber is a device which absorbs carbon dioxide . It is used to treat exhaust gases from industrial plants or from exhaled air in life support systems such as rebreathers or in spacecraft, submersible craft or airtight chambers...
, and oxygen container and diluent container (both spherical), and valves are in a backpack casing, but its breathing bag is exposed on the chest.It has the usual loop of wide corrugated breathing tube
Breathing tube (in breathing apparatus)
A breathing tube is a flexible tube for breathing through, as part of a scuba set or other breathing apparatus or a medical oxygen apparatus or anaesthetic apparatus They are wide, and usually corrugated to let the user's head move about without the tube pinching at...
s running from and to the top of the backpack. It has a small bailout cylinder horizontally across the bottom of the breathing bag. It can be calibrated before the dive to suit planned diving conditions.
It is a self-mixing rebreather. 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, and thus the leaner the mix is. The correct setpoint is controlled with an electronic partial pressure measuring device. The CUMA is capable for diving to 90 meters = 295 feet. Its diluent can be air or trimix or heliox
Heliox
Heliox is a breathing gas composed of a mixture of helium and oxygen .Heliox has been used medically since the 1930s, and although the medical community adopted it initially to alleviate symptoms of upper airway obstruction, its range of medical uses has since expanded greatly, mostly because of...
.
Its first prototype
Prototype
A prototype is an early sample or model built to test a concept or process or to act as a thing to be replicated or learned from.The word prototype derives from the Greek πρωτότυπον , "primitive form", neutral of πρωτότυπος , "original, primitive", from πρῶτος , "first" and τύπος ,...
set was made in March 1987.