Accession Number:

ADA256127

Title:

Evaluation of Carleton Technology Incorporated Mouthpiece Utilized in LAR V UBA with Two Grades of Sofnolime CO2 Absorbent

Descriptive Note:

Final rept.

Corporate Author:

NAVY EXPERIMENTAL DIVING UNIT PANAMA CITY FL

Personal Author(s):

Report Date:

1992-07-01

Pagination or Media Count:

17.0

Abstract:

One of the major contributions to the breathing resistance of underwater breathing apparatus UBA is the mouthpiece. Recently, Carleton Technology, Inc. supplied NEDU with a modified mouthpiece for evaluation. Reduced breathing resistance was obtained using the Carleton Technology mouthpiece in the MK 16 MOD 0 UBA. NEDU evaluated breathing resistance of the Carleton mouthpiece and standard MK 16 UBA breathing h fitted to the LAR V UBA using 4-8 mesh 2.5-5.0 m and 8-12 mesh 1.0-2.5 m Sofnolime C02 absorbent Molecular Products, United Kingdom, comparing it to the standard Draeger LAR V mouthpiece using 4-8 mesh Sofnolime. Using Sofnolime 4-8 mesh absorbent, the Carleton mouthpiece reduced overall breathing resistance in the LAR V UBA 31.5 percent, and 20.4 percent when 8-12 mesh Sofnolime was used. These findings support the future use of smaller C02 absorbent mesh sizes in the LAR V UBA, using the enhanced canister equipped with a modified absorbent retaining screen, in combination with the Carleton mouthpiece. This would allow Longer canister durations yet simultaneously provide tower breathing resistance to the diver.

Subject Categories:

  • Administration and Management
  • Acoustooptic and Optoacoustic Devices

Distribution Statement:

APPROVED FOR PUBLIC RELEASE