Limits of Respiratory Gases and Carbon Monoxide at Which Conventional Submarines Must Ventilate

Abstract : The Annex To STANAG 1184 requires that commanders of conventional submarines ventilate the ship with sea-level air when oxygen (02) content falls below 18%, carbon dioxide (CO2) content exceeds 3%, or carbon monoxide (CO) content exceeds 200 ppm. We accept these limits as realistic figures for requiring ventilation of conventional submarines. Our justification is based on a review of investigations conducted by seientists at the Naval Submarine Medical Research Lab., New London (NSMRL). Based on the review of data complied at NSMRL, it is recommended that the ship ventilate with sea-level air when levels of CO reach 200 ppm. Guidelines for ventilating conventional submarines must seem reasonable to the operational forces as well as to the scientists who issue the standards.