Accession Number:

ADA030358

Title:

Breathing Pressure and Ventilation Efficiency Characteristics of the Kirby-Morgan KMB-8 1/2 (Prototype KMB-9) Band Mask,

Descriptive Note:

Corporate Author:

NAVY EXPERIMENTAL DIVING UNIT PANAMA CITY FLA

Personal Author(s):

Report Date:

1975-12-01

Pagination or Media Count:

133.0

Abstract:

The Kirby-Morgan KMB-8 12 Prototype KMB-9 Band Mask was subjected to an extensive series of breathing simulation tests at the Navy Experimental Diving Unit, using a breathing machine and a specially constructed test manikin. The mask was tested throughout the 0 - 1000-fsw depth range. The mask, supply umbilical, breathing machine, and manikin were instrumented to monitor inspired and expired flow rate, inspired and expired pCO2 levels, and all critical gas supply system pressures. The mask was tested when supplied with low-pressure 0 - 250 psig air, high-pressure air, and high-pressure mixed gas. Minimum overbottom pressure occurring at the inlet to the second stage regulator during inhalation was found to have the most critical effect on the breathing pressure performance of the mask. The primary sources of difficulty were the flow resistance in the mask plumbing upstream of the second stage inlet, and, when a first stage regulator was used, insufficient first stage outlet pressure. The masks inspired pCO2 levels were satisfactory under all conditions tested. The maximum depth at which the mask would support a divers respiratory flow-rate demands was defined for most normal diving conditions in the 0 - 1000-fsw depth range.

Subject Categories:

  • Life Support Systems

Distribution Statement:

APPROVED FOR PUBLIC RELEASE