... tests carried out to verify its accuracy when using both nitrogen and helium as the precharge gas. Introduction As drilling and subsea production moves to ever-deeper waters, gas charged accumulator capacity calculations must become more sophisticated than the traditional ideal gas law methods, since...

... conducted using helium and oxygen, a gas mixture called Heliox. Helium has a low molecular weight but no anti-HPNS property and the pressurization must be very slow. In 1972, two Comex divers reached 610 meters during the Physalie VI dive after 7.5 days of compression on Heliox. In 1975, the Duke...

... ABSTRACT HYDRAV was performed in COMEX Marseille hyperbaric Research Center in May and June 1985.During this Experiment, 6 divers lived at a simulated depth of 450 meters in a hyperbaric atmosphere composed of hydrogen, helium and oxygen (hydreliox). Tradition deep diving with helium...

... in the offshore oil industry. Introduction In 1965 men were first compressed to 600 ft (183 m) for 4 hours and 800 ft (244 m) for 2 hrs at rates of 91 ft/min (27.7 m/min) to produce the first report of signs and symptoms, initially attributed to the helium but later to the pressure itself, and called the High...

... ABSTRACT Man?s deeper exploration of the ocean depths has presented interesting physiological problems. In addition to nitrogen narcosis, decompression sickness, and helium tremors, speech communication is impaired. The use of exotic diving gas mixtures and the greater density of the mixtures...

... 100 years that decompression sickness has been known, the gas used in most diving has been air. When helium diving was introduced in about 1935, it was used, with necessary oxygen, from start to finish in a dive, without gas switching during decompression. Such use of helium alone continued in naval...

... communication igloo diving biomedicalresearch atmospheric conditioning system upstream oil & gas biomedicalresearch environmental health effect laboratory health & medicine mrcc contaminant enhanced recovery helium conditioning system compressor oxygen ehel animal chamber control panel...

... one-atmosphere working carbon dioxide neutrabaric method upstream oil & gas nitrogen helium equipment chamber contaminant devezopment ohamber intertek technical service ltd neutrabaric depressurisation submersibze OTC 2984 THE NEUTRABARIC METHOD FOR ONE-ATMOSPHERE WORKING IN SUBSEA...

... if not eliminated by the introduction of stage decompression by Haldane in the early 1900's. This extended diving to the limit imposed by nitrogen narcosis, until the use of helium eliminated this restriction after the 1920's. A vast increase in efficiency of some types of underwater work was brought about...

... attainment and arousing interest as to the depth limits of man in the sea. Early, in 1965, experiments at the Royal Naval Physiological Laboratory (RNPL) were carried out in which men were exposed to oxygen helium at 600ft for 4 hours and 800ft for 1 hour during which tests were made of mental and manual...

... will be overloaded. Experiments have shown that the following holds true (within a few percent) in hyperbaric atmospheres. 1. Flow variables such as blower pressure, flow rate and flow resistance are functions of atmospheric density and not compositions in atmospheres consisting of helium, oxygen and nitrogen...