Everything about Asphyxiant Gas totally explained
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An
asphyxiant gas is a non-toxic or minimally toxic gas which dilutes or displaces the
oxygen containing
atmosphere, leading to death by
asphyxiation if breathed long enough. Toxic gases in large enough concentrations to cause asphyxia lead to death by other mechanisms such as interaction with the
respiratory system by competing with oxygen (such as
carbon monoxide) or causing direct damage (such as
phosgene). Because asphyxiant gases are relatively
inert, their presence in large quantities may not be noticed until the effects of elevated blood carbon dioxide are recognized by the body. Asphyxiation isn't an intrinsic gas property, but arises from its ability to cause death by
asphyxiation without causing other symptoms. Notable examples of asphyxiant gases are
nitrogen,
argon, and
helium. The
earth's atmosphere is made of 79% asphyxiant gases (mainly
nitrogen), and 21% oxygen. This is an example of how all safe, breathable atmospheres are made up of a high enough concentration of oxygen together with at least one asphyxiant gas.
Examples of asphyxia by asphyxiant gas
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This means that asphyxiant gases are normally hazardous only in special circumstances, due to the exclusion of the naturally abundant
oxygen in Earth's atmosphere:
- Environmental gas displacement
- breathing in a confined space, combined with accidental gas leaks such as mines, submarines, refrigerators, or other confined spaces
- fire extinguisher systems that flood spaces with inert gases - such as computer data centers and sealed vaults
- due to a large-scale release of gas, even larger areas can be affected given enough asphyxiant gas, such as during the Lake Nyos disaster in which volcanically-released carbon dioxide was responsible for the death of 1,800 people.
- Direct administration of asphyxiant gas
- exclusive administration of a gas, such as from inhaling the contents of a balloon filled with helium
- inadvertent administration of asphyxiant gas in respirators
- asphyxiant gases are also used in suicide and erotic asphyxiation.
- Contained asphyxiant gas environment
- climbing inside an inflatable balloon filled with helium
Handling of asphyxiant gases
US
The handling of compressed asphyxiant gases and the determination of appropriate environment for their use is regulated in the
United States by the
Occupational Safety and Health Administration (OSHA) and
National Institute for Occupational Safety and Health (NIOSH). OSHA requirements for the use of asphyxiant gases mandate the provision of respiratory protective devices under the Respiratory Protection Standard [29CFR 1910.134]. This includes "respirator selection, an evaluation of the worker's ability to perform the work while wearing a respirator, the regular training of personnel, respirator fit testing, periodic workplace monitoring, and regular respirator maintenance, inspection, and cleaning." Containers should be labeled according to OSHA's Hazard Communication Standard [29CFR 1910.1200]. These regulations were developed in accordance with the official recommendations of
Compressed Gas Association (CGA) pamphlet P-1. The specific guidelines for prevention of asphyxiation due to displacement of oxygen by asphyxiant gases is covered under CGA's pamphlet SB-2,
Oxygen-Deficient Atmospheres. Specific guidelines for use of gases other than air in back-up respirators is covered in pamphlet SB-28,
Safety of Instrument Air Systems Backed Up by Gases Other Than Air.
Odorized asphyxiant gas
Because of the potential danger of inadvertent asphyxiant gas leaks in the workplace, there have been proposals to odorize some commonly used atmospheric gases such as nitrogen and argon so that their presence can be detected by smell. However, the Compressed Gas Associated has published a position paper arguing against this practice. Their arguments include concern that odorized gas will lead to more relaxed handling of the gases, that the ability to smell is variable among workers, and that there are impracticalities involved in assigning a different smell to each gas.
UK
In the United Kingdom gasses are covered by
COSHH.
The asphyxiant, and potentially explosive,
natural gas is given an odour artificially.
Historical aspects
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The dangers of excess concentrations of non-toxic gases has been recognized for centuries within the mining industry. The concepts of
black damp (or "stythe") and
afterdamp reflect an understanding that certain gaseous mixtures could lead to death with prolonged exposure. Early mining deaths due to mining fires and explosions were often a result of encroaching asphyxiant gases as the fires consumed available oxygen. Early self-contained
respirators were designed by mining engineers such as
Henry Fleuss in order to help in rescue efforts after fires and floods. While canaries were typically used to detect carbon monoxide, tools such as the
Davy Safety Lamp and the
Geordie lamp were useful for detecting
methane and carbon dioxide, two asphyxiant gases. When methane was present, the lamp would burn higher; when carbon dioxide was present, the lamp would gutter or extinguish. Modern methods to detect asphyxiant gases in mines led to the
Federal Mine Safety and Health Act of 1977 in the United States which established ventilation standards in which mines should be "...ventilated by a current of air containing not less than 19.5 volume per centum of oxygen, not more than 0.5 volume per centum of carbon dioxide..."
Further Information
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