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Hydrogen Sulfide Gas (HHydrogen Sulfide Gas (H 22S)S)AwarenessAwareness

TRAINING

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Hydrogen Sulfide Gas (HHydrogen Sulfide Gas (H 22S)S)Generalities:

F ound worldwide

Produced during biological & industrial process

Often associated with gas ,oil & water

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M easurement unit:

PP M : Parts per million

Percentage in volume.1 ppm is equal to

1m/m in 1 Km or 1 inch in 1.6 miles

1gallon in 1000 000 gallons 1$ in 1000 000 $

HH22SS

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H2S Physical & Chemical properties:

Ex tremely to x ic. Colorless. Heavier than air specific gravity: 1 .189 Offensive odor (rotten eggs). Odor Threshold value: 0.02 8 mg/m3 (0.002 ppm).

Vapor pressure 20AT M at 260C Produces Sulfur Dio x ide (SO 2 ) when burning. Soluble. Causes corrosion.

HH22SS Theimagecannot bedisplayed. Your computer may nothaveenough memory toopen theimage, or theimagemay havebeencorrupted.Restartyour computer,and then open thefile again.If thered x stillappears, you may havetodeletethe imageand theninsertitagain.

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F ire & Ex plosion Hazards

Ex plosive between 4.3% to 46% per volume

Auto ignition temperatures: 260c

Ex tinguishing media: CO 2 Dry powder

Special procedures: Wear SCBA

HH22SS

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Deadly gas ,causes paralysis of the respiratory center

1 ppm (0.000 1 %) Od or of rotten eggs.

1 0ppm (0.00 1 %) T hreshol d Limit Value - 8 hours continuouswork.

1 00ppm (0.0 1 %) S mell killed within 3-1 5 minsEyes, T hroat, S kin irritation, Hea d ache,Upset stomach, Pulse R ate Increases.

200ppm (0.02%) Kill sense of smell, Eyes & T hroat Burning.

7 00ppm (0.0 7 %) Unconsciousness, Breathing S top.

1 0Kppm (0. 1 %) Imme d iate UnconsciousnessImminent d eath.

Effect of H

Effect of H 22SS

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F actors affecting Individuals

DurationThe length of time the person is e x posed to H 2S Intensity

Concentration of H 2S the person is e x posed to

R eceptivityPhysical & mental conditions of the person

F requencyHow often/long the person is e x posed to H 2S

HH22SS

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Use detector not your nose

M ake sure detectors are working set at 1 0 & 20ppm

Locate them where you can see the visual warning.

Adjust sound level to surrounding noise

HH22SS DetectionDetection

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Know the escape routes & alarms.

Wear Safety equipment.

Check for wind direction.

E scape crosswind to M uster Point.

R emember H 2 S is heavier than air

HH22SS E

scapeE

scape

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Wear SCBA.

Always have a backup.

Bring victim out of contaminated area.

Give F irst Aid.

HH22SS ProtectProtect

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Wear SCBA.

Use the Sniffer.

Dont use personal monitor.

R eturn to area only after measurement completed &when all the alarm have stopped.

M easurement is performed by Site QHS E Officer.

HH22SS M

easureM

easure

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General Corrosion Corrosion that appears all over the e x posed area of metal.

Pitting Corrosion

WhenF

e is scratched / removed metal become anodic tosurrounding film covered metal.

Stress Corrosion Cracking Stress corrosion cracking occurs in places where stress is

imposed to the material & around welds where inadequate heat

control has created internal stress, the total stress may ex

ceedthe yield strength of the material.

Hydrogen E mbrittlement Causes spontaneous brittle fracture of steel when e x posed to

water & H 2 S weakening them at 15 % of their yield strength.

HH22SS E

ffect onE

quipmentE

ffect onE

quipment