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Tony Vierboom - NOVA PROTECTION SYSTEMS - Understanding & working with hazardous area classifications

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Tony Vierboom delivered the presentation at the 2014 Dust Explosions Conference. …

Tony Vierboom delivered the presentation at the 2014 Dust Explosions Conference.

The 2014 Dust Explosions Conference examined industrial hazards, the means to control or eliminate dust and analysed the latest technology to ensure the maximum protection and safety of organizations. The event also featured recent industrial case studies and new safety recommendations.

For more information about the event, please visit: http://www.informa.com.au/dust14

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  • 1. Nova Protection Systems Pty. Ltd. Intercontinental Association of Experts for Industrial Explosion Protection. 1 Dust Explosions - 2014 Hazardous Areas Presented by Tony Vierboom
  • 2. Nova Protection Systems Pty. Ltd. Intercontinental Association of Experts for Industrial Explosion Protection. 2 Agenda •Introduction. •What is a Dust Explosion •How do they Happen •Hazardous Zones •Risk Analysis •Action Plan
  • 3. Nova Protection Systems Pty. Ltd. Intercontinental Association of Experts for Industrial Explosion Protection. 3 Introduction • History of Incidents • Basics of Fire and Dust Explosion • Primary and Secondary Explosions
  • 4. Nova Protection Systems Pty. Ltd. Intercontinental Association of Experts for Industrial Explosion Protection. 4 Fertilizer Factory Toulouse France Milk Spray Drier Rotterdam Holland
  • 5. Nova Protection Systems Pty. Ltd. Intercontinental Association of Experts for Industrial Explosion Protection. 5 Starch Production Factory Tamworth Australia Pet Food Factory Gunnedah Australia Savannah USA – Imperial Sugar Refinery Dust Explosion – Feb 2008 – 13 dead, 60 injured.
  • 6. Nova Protection Systems Pty. Ltd. Intercontinental Association of Experts for Industrial Explosion Protection. 6 November 01, 2011 12:00AM Explosion ... smoke rises from the damaged head house area of the Bartlett Grain Grain Storage – Kansas, USA
  • 7. Nova Protection Systems Pty. Ltd. Intercontinental Association of Experts for Industrial Explosion Protection. 7 Westwego Grain Elevator
  • 8. Nova Protection Systems Pty. Ltd. Intercontinental Association of Experts for Industrial Explosion Protection. 8 Dust Explosions in the Process Industries Dust Explosions in the Process Industries have caused serious incidents resulting in multiple fatalities and severe structural damage. Combustible dusts include; •Grain Dusts •Food Powders – flour, starches, dextrin, milk, sugar etc. •Pharmaceuticals •Wood, Coal, Lignite, Peat •Pesticides •Fertilizers In fact most organic dusts can ignite.
  • 9. Nova Protection Systems Pty. Ltd. Intercontinental Association of Experts for Industrial Explosion Protection. 9 What are the different types of burning ? * Slow burn = Smoldering * Medium burn = Fire * Fast burn = Explosion • Combustion rate (release of the heat over a period of time). • Surface exposed to the oxygen. • From a slow smoldering to an flash fire which can cause an explosion.
  • 10. Nova Protection Systems Pty. Ltd. Intercontinental Association of Experts for Industrial Explosion Protection. 10 Relation between size of the dust particle & the rate of combustion. a a/2 The surface exposed to oxygen has increased by a factor of 2 so has the rate of combustion. If we halve the size of the powder particle
  • 11. Nova Protection Systems Pty. Ltd. Intercontinental Association of Experts for Industrial Explosion Protection. 11 Secondary dust explosion! Blast wave Primary explosion Formation of dust cloud Dust layer Secondary explosion
  • 12. Nova Protection Systems Pty. Ltd. Intercontinental Association of Experts for Industrial Explosion Protection. 12 Fuel ? Oxygen? Aspiration? Ignition source Risk Assessment
  • 13. Nova Protection Systems Pty. Ltd. Intercontinental Association of Experts for Industrial Explosion Protection. 13 The Process and progression of documentation.
  • 14. Nova Protection Systems Pty. Ltd. Intercontinental Association of Experts for Industrial Explosion Protection. 14 Process Machinery Overview. Sugar Flour Milk Powder
  • 15. Nova Protection Systems Pty. Ltd. Intercontinental Association of Experts for Industrial Explosion Protection. 15 Zone 20 – A place in which an explosive atmosphere, in the form of a cloud of dust in air, is present continuously, or for long periods or frequently.
  • 16. Nova Protection Systems Pty. Ltd. Intercontinental Association of Experts for Industrial Explosion Protection. 16 Zone 21 – A place in which an explosive atmosphere, in the form of a cloud of dust in air, is likely to occur in normal operation, occasionally.
  • 17. Nova Protection Systems Pty. Ltd. Intercontinental Association of Experts for Industrial Explosion Protection. 17 Zone 22 – A place in which an explosive atmosphere, in the form of a cloud of dust in air, is not likely to occur in normal operation but, if it does occur, will persist for a short period only.
  • 18. Nova Protection Systems Pty. Ltd. Intercontinental Association of Experts for Industrial Explosion Protection. 18 Who – Who should prepare the Hazardous Zone Identification Responsibility Competency Collaboration Review
  • 19. Nova Protection Systems Pty. Ltd. Intercontinental Association of Experts for Industrial Explosion Protection. 19 Understanding and Limiting Hazardous Zones. “an Explosive atmosphere in the form of a cloud of dust in air” House Keeping - Awareness and Training - How much dust is too much dust? - Clean up spills and leaks – wet clean down or vacuum – no compressed air. - Programmed Maintenance Aspiration – remove the dust air mixture. Operate plant at negative pressure. Plant Monitoring – safety interlocks to insure that safety features are all in place during the processing of combustible powders.
  • 20. Nova Protection Systems Pty. Ltd. Intercontinental Association of Experts for Industrial Explosion Protection. 20 What thickness of dust layer can cause a Secondary Explosion? Bulk density : ρ = 500Kg / m³ Room height : H = 4m Min expl. Dust conct : C = 50g / m³ Dust layer thickness : h ? (mm) h= c * H / ρ h = 0.4 mm 4 m 0.4mm dust layer ρ = 500Kg / m³ Dust cloud C = 50g / m³
  • 21. Nova Protection Systems Pty. Ltd. Intercontinental Association of Experts for Industrial Explosion Protection. 21 Dust Collector Inside plant with Explosion panels facing fuel loaded environment. Secondary Explosion?
  • 22. Nova Protection Systems Pty. Ltd. Intercontinental Association of Experts for Industrial Explosion Protection. 22 Process Control and Monitoring.
  • 23. Nova Protection Systems Pty. Ltd. Intercontinental Association of Experts for Industrial Explosion Protection. 23 Bucket Elevator after a dust Ignition Explosion
  • 24. Nova Protection Systems Pty. Ltd. Intercontinental Association of Experts for Industrial Explosion Protection. 24 Effect of various means of preventing and mitigating dust explosion. LOW HIGH A B C D ISOLATION VENTING CONTAINMENT SUPPRESSION INERTING PREVENTING IG.SOURCES TRAINING MOTIVATION ORGANISATION House-Keeping MAINTENANCE
  • 25. Nova Protection Systems Pty. Ltd. Intercontinental Association of Experts for Industrial Explosion Protection. 25 Risk Reduction ! • Motivation & Training. • Equipment design (powder deposit, hot surfaces,….). • Good monitoring (temperature, pressure, smell, CO,..). • Good house keeping (prevent 2nd explosion,…). • Good working procedures (hot work permit,…). • Good maintenance. We are all responsible for a Safe Working Environment.
  • 26. Nova Protection Systems Pty. Ltd. Intercontinental Association of Experts for Industrial Explosion Protection. 26 Pathways to selecting Compliant Equipment.
  • 27. Nova Protection Systems Pty. Ltd. Intercontinental Association of Experts for Industrial Explosion Protection. 27
  • 28. Nova Protection Systems Pty. Ltd. Intercontinental Association of Experts for Industrial Explosion Protection. 28 Thank you: For Making Sure That Your Facility never appears in my presentations.
  • 29. Nova Protection Systems Pty. Ltd. Intercontinental Association of Experts for Industrial Explosion Protection. 29
  • 30. Nova Protection Systems Pty. Ltd. Intercontinental Association of Experts for Industrial Explosion Protection. 30
  • 31. Nova Protection Systems Pty. Ltd. Intercontinental Association of Experts for Industrial Explosion Protection. 31 Imperial Sugar Disaster.