Accession Number : ADA156305


Title :   The Use of Austenitic Stainless Steel versus Monel (Ni-Cu) Alloy in Pressurized Gaseous Oxygen (GOX) Life Support Systems.


Descriptive Note : Master's thesis,


Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA


Personal Author(s) : Marsh,B


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a156305.pdf


Report Date : Mar 1985


Pagination or Media Count : 133


Abstract : Gaseous oxygen (GOX) must be stored at pressures up to 24 MPa (3500 psi) to provide the flow rates required to support the metabolic needs of a diver. A review of the literature concerned with materials compatibility in pressurized oxygen systems were conducted, with emphasis on metallic structural materials. Review of experimental and theoretical work on combustion of austenitic stainless steels and nickel-copper alloys revealed a consensus that Monel nominal (63 % Ni-34% Cu) is preferred in high pressure oxygen systems, when its strength and weight are acceptable. At the intermediate pressures, 0.7 to 10.3 MPa (100 to 1500 psi), the relative safety of stainless steel as a structural material is unclear, This thesis reviewed the following testing methods: friction rubbing, particle impact, fresh metal exposure to heated flowing GOX, promoted ignition and resonance. An experimental apparatus was used to simulate the conditions of GOX flow found in an operational diving set and to compare the flame propagation rates for austenitic stainless steel (AISI 316), Monel (63% Ni -34% Cu) and carbon steel (AMS 5050) tubing in this environment. Keywords: Flame propagation rates; Breathing apparatus; Diver equipment.


Descriptors :   *FLAME PROPAGATION , *DIVER EQUIPMENT , *BREATHING APPARATUS , *TUBES , EXPOSURE(GENERAL) , RATES , THESES , COMPATIBILITY , STAINLESS STEEL , HIGH PRESSURE , AUSTENITE , OXYGEN , COMBUSTION , FLOW RATE , SAFETY , IGNITION , HOT GASES , PRESSURIZATION , LIFE SUPPORT SYSTEMS , FRICTION , PARTICLE COLLISIONS , CARBON STEELS , COPPER NICKEL ALLOYS


Subject Categories : Metallurgy and Metallography
      Life Support Systems


Distribution Statement : APPROVED FOR PUBLIC RELEASE