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DATASHEET OXYGEN REBREATHER
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Mc Caa oxygen rebreather
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Date: 03 December 2002 |
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JW. Bech
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Manufacturer |
M.S.A |
USA Patent
1,625,419 |
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Model
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McCAA |
1925 |
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Land of
origin |
USA |
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Special
Note: |
Used
for mine rescue |
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User
group |
Civil |
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Part
no: |
? |
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Working principle |
Bag volume operated
"on Demand" |
Cooler
integrated |
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Gas type |
Oxygen |
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Cylinder volume |
243 ltr |
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Max. cylinder pressure
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1.985 PSI |
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Material of cylinder
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steel |
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Counterlung inspire |
8 liter
chestmounted |
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Counterlung exhale |
- |
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Dive time duration |
2 hours |
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Operating temperature
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50 gr.
C |
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Magnetic signature |
- |
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Weight ready to use in Air
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17,7 kg |
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Weight ready to use in water
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? |
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MOD |
- |
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Scrubber material |
Calciumhydroxide (Cardoxyde) |
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Colour |
?
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Price |
? |
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Worn |
On the
chest |
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Mouthpiece |
Double
hose no shut off valve |
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Backpack |
- |
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Extra |
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Extra |
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If you
have any information to add this sheet please mail it to
jw.bech@quicknet.nl
References to source and names will always be added!
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Info found: |
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Origin:
http://www.therebreathersite.nl |
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Info:
United States Patent 1,625,419 |
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MSA
McCAA
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The McCaa is a compressed-O2, closed circuit
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apparatus with a refillable CO2-absorbent canister that is
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integral with the apparatus frame. It was originally approved by
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the USBM in 1925 as a 2-hr apparatus and is permitted by
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NIOSH to be used indefinitely as long as it is maintained in an
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approved condition. The O2 cylinder contains approximately
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243 L ATPD of O2 when filled to 1,985 psi at room
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temperature. The McCaa does not have a constant flow of O2;
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the demand valve regulator is activated by bag volume. The
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relief valve is functionally combined with a saliva trap release
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in the face mask and is manually activated. The CO2 absorbent
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is called Cardoxide, which consists mostly of CaOH.
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The user exhales into a face mask or a mouthpiece, through
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an exhalation check valve and hose, through the CO2-absorbent
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canister, to the 8-L breathing bag. Inhaling draws air from the
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breathing bag, through a large plenum formed by the entire case
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housing that serves as a heat radiator, and through the inhalation
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hose and check valve in the face mask or the mouthpiece.
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A
face mask without a nose cup was used in this testing.
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This device is no longer used to any extent. It is claimed that
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this apparatus is positive-pressure with a static head pressure of
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about 6 mm H2O. This claim is made by Grove [1941], but the
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breathing circuit pressure does not remain positive during
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inhalation and would certainly not qualify as positive-pressure
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by present standards.
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