atex manager development of a web-based tool to support companies in controlling explosion risks
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ATEX manager Development of a web-based tool to support companies in controlling explosion risks Henri Heussen & Dook Noy. Introduction. VAST programme (Ministry of Social Affairs) Goal: reinforcement of working conditions in SME’s with regard to hazardous substances Key elements: - PowerPoint PPT PresentationTRANSCRIPT
ATEX manager
Development of a web-based tool to support companies in controlling explosion risks
Henri Heussen
& Dook Noy
Introduction
• VAST programme (Ministry of Social Affairs)
• Goal: reinforcement of working conditions in SME’s with regard to hazardous substances
• Key elements:– creating awareness– improvement of communication in the chain– development of supporting tools
• Stoffenmanager: generic web-based tool for risk prioritization (www.stoffenmanager.nl)
• 2th stage: development of branche specific versions of Stoffenmanager and additional modules => ATEX manager
• Developed by Arbo Unie, BECO group and TNO
ATEX manager
• Starting point: guidelines for controlling explosion risks in the animal fodder industry
• Conversion to web-based specific tool for animal fodder industry
• Development of generic tool for SME’s
• Modules:– Quick Scan explosion hazards (applicability ATEX guidelines)– Data entry materials, process equipment, production locations– Classification of hazardous areas into zones (combustible
dusts/flammable gases/vapours/mists)– Evaluation of ignition risks– Generation of Explosion Protection Documents
Quick Scan combustible dusts
Combustible dust present?
Interior process
equipment?
Process equipment
located outdoors?
> 50 kg dust (particle size <
0,1 mm)?
> 50 kg dust (particle size
between 0,1-0,5 mm)?
> 1 kg dust (particle size
between 0,1-0,5 mm?
> 0,1 kg dust (particle size <
0,1 mm?
Zoning
not necessary
Zoning necessary
no yes
no
no
no no
no no
yes
yes
yes yes
yes yes
Start quick scan
Data entry materials
• Large set of parameters– Combustible dusts:
• Lower Explosion Limit (LEL)• Minimum Ignition Temperature cloud (IT)• Minimum Ignition Temperature layer (GT)• Mimimum Ignition Energy (MIE)• Maximum Rate of Explosion Pressure Rise
(dp/dt)max
• Kst ( = (dp/dt)max ,volume dependent)
• Dust Explosion Class (based on Kst)• Flammability (BZ)• Particle size• Limiting Oxygen Concentration (LOC)
• Optional future development: explosion hazard banding based on parameters like:– Ignition temperatures and –energy, flammability– Dust Explosion Class
Zoning (dust cloud)
Dust cloud present > 1000
hours/year?
Dust cloud present > 10 hours/year?
Well designed local
ventilation?
Additional guaranties?
Absoluty guaranteed?
Well designed local
ventilation?
Well designed local
ventilation?
Zone 20
Zone 21
no
yes
Additional guaranties?
Zone 22
NHA
no
no
nono
no
no
no
yes
yes
yes
yes
yes yes
yes
Evaluation of ignition risks
Chose potential ignition source
Export to Action Plan?
Document decision
Zone
Describe scenario
Choose frequency scenario
Choose severity of effects scenario
Risk level
acceptable?
Describe and evaluate potential measures
Action Plan
no
no
yes
yes
Risk bands
A: high riskB: substantial riskC: limited riskD: low risk
Likelyhood
Adverse effects
Catastrophal
Serious Not serious Neglectible
Frequently A A A C
Likely A A B D
Possible A B B D
Unlikely A B C D
Highy unlikely
B C C D
Control banding?
Hazard bands
Ignition/combustion
characteristics
Explosion
characteristics
Control bands
Prevention:
- ignition sources => technical measures
=> organ. measures
-inerting => limiting oxygen
- combustible/flammable materials=> product elimination
=> product modification
Protective/corrective:
- explosion relief
- explosion suppression
- explosion resistant design
Explosion
triangle
O2
Ignition
sources
Flammable
substances
Higher hazard ignition band
Higher hazard explosion band
THANK YOU!