Case Study 2
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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 gasesNot Detected (ND) Carbon dioxide0.06 %ES 0.5% IDLH 5 %

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Case study 2 supplementary information for course presenter

Case Study 2

Supplementary Information for Course Presenter


Case study 2 supplementary information for course presenter

Rice-growers Co-operative Limited

Double Fatality


Case study 2 supplementary information for course presenter

The Site


Case study 2 supplementary information for course presenter

The Rice Shed


Case study 2 supplementary information for course presenter

The Elevator Pit


Initial on site analysis

Initial On Site Analysis

Combustible gasesNot Detected (ND)

Carbon dioxide0.06 %ES 0.5%

IDLH 5 %

Carbon monoxideNDES 25 ppm

IDLH 1500 ppm

Hydrogen sulphide15 ppmES 10 ppm

IDLH 300 ppm

ESExposure Standard

IDLHImmediately Dangerous to Life & Health


Gas bag analysis

Gas Bag Analysis

Normal Atmospheric Gases

Oxygen20.7 %(20.9%)

Carbon dioxideTrace(0.04%)

Nitrogen79.2 %(78 %)

Asphyxiants

MethaneTrace

EthaneND

PropaneND

Contaminant Gases

Carbon monoxide ND(ES 25 ppm)

Hydrogen sulphideTrace(ES 10 ppm)


Head space gas analysis

Head Space Gas Analysis

Hydrogen sulphide

Wine flagon540 ppm

Soft drink bottle450 ppm

ES10 ppm

IDLH300 ppm


Microbiological water analysis

Microbiological / Water analysis

Pit Brew Water 9000 H2S producers/ml

Bore (seepage) water1000 - 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

ppmEffect

0.1 - 30Odour of rotten eggs - obvious & unpleasant

50-100Marked dryness & irritation nose & throat

100-150Temporary loss of smell - olfactory fatigue

200-250Severe 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

Oxygen20.8 %

Carbon monoxideND

Carbon dioxide0.06 %

Combustible gasesND

Hydrogen sulphideND


Simulation of events cont

Simulation of Events (cont)

Agitation of the pit by malfunctioning pump

Oxygen20.8 %

Carbon monoxideND

Carbon dioxide0.06 %

Combustible gasesND

Hydrogen sulphide300 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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