Semi-Closed Circuit Mixed-Gas Injection Scuba.

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Title: Semi-Closed Circuit Mixed-Gas Injection Scuba.
Author: Dwyer, JV
Abstract: The research report describes the general class of semi-closed mixed-gas scuba using constant injection, and outlines the problems leading to the analysis. Postulating instantaneous mixing and homogeneous composition, the analysis considers the steady-state bag oxygen level as affected by supply oxygen percentage, injection rate, and oxygen consumption. The analytical equations yield an extensive tabulation of actual values for various conditions, and corresponding performance curves. The analysis also covers a nomographic method of fixing the maximum variation of bag oxygen level. The report discusses: application of the performance curves to constant and variable mass injection systems; use of the nomograph for setting injection rates; mixed-gas diving limits; and conformance of actual equipment to predicted performance. The conclusions are that the report is an extensive analysis of performance characteristics, that it has many applications to work in progress, and that it can serve as a general reference for mixed-gas injection scuba. (Author)
Description: Citation Status: Active; Citation Classification: Unclassified; Title Classification: Unclassified; Report Classification: Unclassified; Identifier Classification: Unclassified; Abstract Classification: Unclassified; Distribution Limitation(s): 01 - APPROVED FOR PUBLIC RELEASE; Information provided by the Department of Defense and the Defense Technical Information Center ( is considered public information and may be distributed or copied unless otherwise specified. Use of appropriate byline/photo/image credits is requested.
Date: 1956

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