Nitrogen Awareness

7/23/2019 Nitrogen Awareness

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Death by Nitrogen

Every year people die in nitrogen rich/oxygen

deficient atmospheres because of ignorance,

attitude and failure to adhere to safe workpractices.


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Nitrogen (N2) vs. Oxygen (O2)

Nitrogen is not toxic it exists in air at 7!.

"xygen in the air is typically #$.!%hen nitrogen concentration increases,

oxygen concentration decreases.

Note: any compressed gas can also decrease O2 concentration in an

enclosed space by replacing O2.


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Facts & Figures - Liquid nitrogen

"ne litre li&uid gives 7$$ litres of gas

'old nitrogen is heavier than air so accumulates at

ground level. %hen li&uid N# is exposed to air the cloudy vapour that

you see is condensed moisture, not N# gas. N# gas is

invisible and this is the (anger))).

"*+ recommend at least - changes of air per hourwhen using li&uid N#.

Other nitrogen risks: pressure, frost, confuse LEL detectors.


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Medica de!initions

Os"osis f you have a concentrated mixture on

one side of a permeable membrane and a dilute

mixture on the other, the flow of material will be fromconcentrated to the dilute side.

#y$oxia reduction of "# supply to the tissues

%noxia lack of "# supply to the tissues.


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rans$ort o! oxygen


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O2 fows rom highconcentration to lowconcentration.


Concentration of

O2 in the lungs ishigh

Concentration of O2 in

the tissues and Brain islower.

Oxygen Os"osis

Oxygen is transported from the lungs to cells,tissue and brain via Osmosis.


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O2 decient air isinhaled Concentration of O2 in thetissues and Brain is higherthan the lungs


Concentration of O2 equalises throughout the body.

















'hat ha$$ens hen you breathein nitrogen

!everse Osmosis

"ungs ta#e O2 from the blood stream which in turn ta#es it from

the brain.


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Brain becomes

starved of oxygen $you pass out.

%ou could sayyour brain shuts youdown

&t only ta#es onebreath'

'hat ha$$ens hen you breathein nitrogen


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*hysioogica e!!ectsOxygen (+vo) ,!!ects & y"$to"s

#0.1 2aximum 3+afe 4evel5 "+*

#6 "# level in air

6.1 2inimum permissible "# level 8most detectors are set here or 9ust aboveit:

61;6 espiration increases with exertion, pulse up, impaired muscularcoordination, perception ? 9udgement.

6$;6# >espiration further increases in rate ? depth, poor 9udgement, lips blue.

;6$ 2ental failure, fainting, unconsciousness, ashen face, blueness of lips,nausea, vomiting, inability to move freely.

-; minutes 6$$! fatal

- minutes 1$! probably fatality rate

=;- 'oma in =$ seconds, convulsions, respiration ceases, death


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#o ong does it tae to have an

e!!ect

%hen a person enters an oxygen deprived

atmosphere the oxygen level in the arterialblood drops to a low level within 1;7 seconds.

4oss of consciousness follows in 6$;6#

seconds.

*eart failure and death ensue if person does

not receive any oxygen in #;= minutes.


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'hat /! / hod "y breath

*olding your breath causes the oxygen in

your blood to be used up. f you then inhalethe inert atmosphere, suffocation and death

will follow in most cases 8N>+ E( -0#:


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Do / have to be in an encosed

s$ace to be at ris

No. ny situation where you can breathe oxygen

deficient air has the same effect.

ncident at @exas 'ity where individual was

working on top of reactor. *e leaned over, got a

blast of pure N# and pitched forward into the

vessel unconscious.

'old nitrogen is more dense than air so lower

concentration at floor level. f you lean down into a

li&uid nitrogen spillage you are also at risk.


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he ast ord0.Nitrogen is a silent killer and

demands RESPECT..!!!

PESE CONTRO "T N#

$OR% RO&N# "T PROPER'


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'hat i! / see a coeague ho is

unconscious

'all emergency services. ;

Nitrogen Awareness

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