Experimental Installation used for Preparation of Breathing Mixtures Needed for Professional Diving

Abstract

Starting from the mathematical modelling of the gas dynamics processes and, of course, from the needs of the Diving Center, several schemes of experimental installations were developed. These schemes are used for the preparation of binary or ternary gas mixtures, specific: for autonomous professional diving, for the system diving, respectively for those simulated or real which are performed in the hyperbaric chambers of the Diving Center or in the diving turrets.The principle of preparing breathing gas mixtures in the experimental installation ensures that an invariable flow rate (with the pressure of the gaseous mixture from a pressurized cylinder) is injected (constant mass flow) while ensuring the permanent control of this flow. The installation delivers an invariable gas mixture flow regardless of the gas pressure value inside the storage cylinder.Depending on the number of components from which the binary or ternary breathable mixture is to be prepared, the design of the plant has been structured in two parts or in the case of a more complex ternary structure of the gaseous mixture, the plant has three distribution-injection lines active. Each of these lines independently carries the three pure component gases used to continuously produce the required respiratory mixture.Finally, the tests of the gas-dynamical processes related to the plant were presented very succinctly, following a comprehensive testing and evaluation plan in the summer of last year.