Biopak 60


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Biopak 60

Date: 09 April 2003

  Biomarine Inc.

JW. Bech





Biopak 60


Land of origin



Special Note: 

 Originally designed for UW use

 Marketed as CCR 25

User group

Terrestrial firefighting/Mine rescue

 Also marketed as " Cobra "

Part no:

Biopak 60 te


Working principle

On demand


Gas type

Pure oxygen


Cylinder volume

6 cubic feet


Max. cylinder pressure

2000 PSI


Material of cylinder



Counterlung inspire

~ 4.5 liters


Counterlung exhale



Dive time duration

60 min. Limited by the factory setup of gas delivery, scrubber material last much longer


Operating temperature



Magnetic signature



Weight ready to use in Air

11,4 kg


Weight ready to use in water




7 mtr


Scrubber material

2.8 pounds sofnolime



Black with orange cover






Back mounted



Full face mask






Total loop volume 9.5 ltrs











If you have any information to add this sheet please mail it to References to source and names will always be added!  


Info found:




Info: Although the BP60 is currently used for terrestrial applications an underwater version was marketed to the US Navy and recreational dive centers in the mid 1980's.  They were the Cobra and CCR25 respectively. The Navy did not see a need to replace their LAR-V RB's and the recreational market was dropped due to liability issues.  I have also seen an underwater version of the BP60 marketed as the SeaPak..




Data contributed by  Mark H. Munro. Thanks Mark!!



The BioPak 60 (figures 3-4) is a compressed-O2, closedcircuitapparatus with a refillable CO2-absorbent canister. Itwas certified by NIOSH in 1978. It was certified again in 1988 as a positive-pressure device after that classification was added in 1985. It contains approximately 170 L of O2 if filled to the recommended cylinder pressure of 2,250 psi.2 A constant flow of 1.9 L O2/min (ATPD) plus a volume-activated demand valve constitute the O2-delivery system. The relief valve is also volume-activated. The CO2 absorbent is Sodasorb, a form of soda lime. The low-pressure alarm sounds at approximately 25% of capacity.

The user exhales into the face mask containing both inhalation and exhalation check valves, through the exhalation hose, through the CO2-absorbent canister, and into the breathing bag consisting of a spring-loaded, rigid diaphragm and a flexible sleeve. The CO2-absorbent canister and breathing bag are contained within the breathing chamber, as Biomarine calls it. Upon inhalation, the air is drawn from the breathing bag through the inhalation hose and check valve, and then into the face mask. An anoxia-prevention valve, located in the exhalation hose at the point that it enters the breathing chamber, blocks exhalation flow unless opened by pressure provided by the O2 cylinder. This prevents use of the apparatus unless the O2 cylinder is opened and pressurized. It also signals the user when the cylinder is empty by preventing exhalation into the circuit. The flow path through the breathing chamber is relatively complex. The exhaled air enters an inlet plenum between the CO2-absorbent canister and a solid plate separating it from the breathing bag. The O2 constant flow enters the circuit at this point, also. The exhaled air then travels through the absorbent to an outlet plenum formed by the canister and the lid of the breathing chamber. The exhaled air is then routed around coolant rings containing sodium phosphate crystals, through slots around the circumference of the housing, and into the breathing bag. The spring-loading on the diaphragm results in a positive static pressure in the breathing circuit. The term "positivepressure" is derived from this feature. When the user demands more air than is contained in the breathing bag, the diaphragm presses against a demand valve, which causes O2 to flow into the bag. The flow of O2 from the bypass valve is delivered to the bag at a location on its circumference. If more air is exhaled into the breathing bag than it can hold, the diaphragm resses against a relief valve and vents the excess volume.



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