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Case Study 2 Supplementary Information for Course Presenter. Rice-growers Co-operative Limited Double Fatality. The Site. The Rice Shed. The Elevator Pit. Initial On Site Analysis. Combustible gases Not Detected (ND) Carbon dioxide 0.06 % ES 0.5% IDLH 5 %

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Case Study 2

Supplementary Information for Course Presenter






Initial on site analysis
Initial On Site Analysis

Combustible gases Not Detected (ND)

Carbon dioxide 0.06 % ES 0.5%

IDLH 5 %

Carbon monoxide ND ES 25 ppm

IDLH 1500 ppm

Hydrogen sulphide 15 ppm ES 10 ppm

IDLH 300 ppm

ES Exposure Standard

IDLH Immediately Dangerous to Life & Health


Gas bag analysis
Gas Bag Analysis

Normal Atmospheric Gases

Oxygen 20.7 % (20.9%)

Carbon dioxide Trace (0.04%)

Nitrogen 79.2 % (78 %)

Asphyxiants

Methane Trace

Ethane ND

Propane ND

Contaminant Gases

Carbon monoxide ND (ES 25 ppm)

Hydrogen sulphide Trace (ES 10 ppm)


Head space gas analysis
Head Space Gas Analysis

Hydrogen sulphide

Wine flagon 540 ppm

Soft drink bottle 450 ppm

ES 10 ppm

IDLH 300 ppm


Microbiological water analysis
Microbiological / Water analysis

Pit Brew Water 9000 H2S producers/ml

Bore (seepage) water 1000 - 4000 ”

Hydrogen sulphide (eg clostridium) formers reduce sulphur compounds to sulphides causing a blackening of the colonies as exhibited by

the water in the pit.


Hydrogen sulphide health effects
Hydrogen Sulphide – Health Effects

ppm Effect

0.1 - 30 Odour of rotten eggs - obvious & unpleasant

50-100 Marked dryness & irritation nose & throat

100-150 Temporary loss of smell - olfactory fatigue

200-250 Severe irritation, headache, nausea - exposure for

4 hours can cause death

500+ Rapidly unconscious & respiratory failure in 5 mins

1000 + May cause coma after a single breath & rapidly fatal


Hypothesis
HYPOTHESIS

  • Hydrogen sulphide from anaerobic bacteria action in pits & released by violent agitation

  • NOT Carbon monoxide from combustion engine

  • Plan to simulate events


Simulation of events
Simulation of Events

Prior to agitation

Oxygen 20.8 %

Carbon monoxide ND

Carbon dioxide 0.06 %

Combustible gases ND

Hydrogen sulphide ND


Simulation of events cont
Simulation of Events (cont)

Agitation of the pit by malfunctioning pump

Oxygen 20.8 %

Carbon monoxide ND

Carbon dioxide 0.06 %

Combustible gases ND

Hydrogen sulphide 300 ppm


Hydrogen sulphide incidents
Hydrogen Sulphide Incidents

  • Similar hydrogen sulphide incidents have been reported in the following industries

    • Meat processing

    • Chicken processing

    • Leather processing


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