closed-circuit breathing

closed-circuit breathing

rebreathing of a contained gas mixture, either directly or after recirculation of the gas through a water-absorbing or carbon dioxide-absorbing unit. An example is breathing through a spirometer.
References in periodicals archive ?
Tenders are invited for Providing Closed-Circuit Breathing System and 10 Divers Semi
Procurement Providing Closed-Circuit Breathing System and 10 Semi Loads Divers According Notebook
As part of the Sobek programme, TNO's Netherlands Organisation for Applied Scientific Research has conducted tests in the Rotterdam port with a passive array of hydrophones and processing algorithms, achieving what is claimed to be the first reported detection of a closed-circuit breathing apparatus-equipped diver in a harbour by passive sonar, at ranges of up to 120 metres in the presence of other targets.
Designed to meet the demands of both portable and ship-borne applications, the Cerberus Mod2 provides improved performance over the Mod1, allowing open- and closed-circuit breathing diver detection respectively at over 900 and 700 metres.
These sales increases were partially offset by lower shipments of gas masks and closed-circuit breathing apparatus.
All equipment supplied under the contract should comply with the following technical specification: EN145:1998, EN13794:2002 and EN1146:2003The base document from which the majority of the requirements are taken is BS EN145:1998 (self-contained closed circuit breathing apparatus compressed oxygen or compressed oxygen-nitrogen type) to cover closed circuit performance with additional requirements taken from BS EN13794: 2002 (Self-contained closed-circuit breathing apparatus for escape) to cover aspects of chemical oxygen performance and prEN1146: 2003 (Self-contained open-circuit compressed air breathing apparatus incorporating a hood for escape) to cover aspects of hood performance.
8 million increase in closed-circuit breathing apparatus shipments reflecting a large order from the Canadian Navy.
Supply of 16 pieces of diving breathing apparatus - rebreathers with electronically controlled fully closed-circuit breathing apparatus.