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Effective design and management of LEV systems
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Effective design and management of LEV systems

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An outline of the principles and practice of effective design and management of local exhaust ventilation systems.

An outline of the principles and practice of effective design and management of local exhaust ventilation systems.


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  • 1. LEV
  • 2. LocalEV
  • 3. LocalExhaustV
  • 4. LocalExhaustVentilation
  • 5. LocalExhaustVentilation
  • 6. Local Exhaust Ventilation stack hood ducting air cleaner fan
  • 7. Estimates by HSE 2006A. 2,240,000 UK businesses
  • 8. Estimates by HSE 2006 A. 2,240,000 UK businessesB. Number withrespiratory risk, needingLEV = 450,000 (20% oftotal UK businesses (A))
  • 9. Estimates by HSE 2006 A. 2,240,000 UK businessesB. Number withrespiratory risk, needingLEV = 450,000 (20% oftotal UK businesses (A))C. Number with LEV =260,000-330,000 (60-73%of B)
  • 10. Estimates by HSE 2006 A. 2,240,000 UK businessesB. Number withrespiratory risk, needingLEV = 450,000 (20% oftotal UK businesses (A)) How many of these are designedC. Number with LEV =260,000-330,000 (60-73% properly?of B)
  • 11. Estimates by HSE 2006 A. 2,240,000 UK businessesB. Number withrespiratory risk, needingLEV = 450,000 (20% oftotal UK businesses (A)) And how many are maintainedC. Number with LEV =260,000-330,000 (60-73% properly ?of B)
  • 12. Estimates by HSE 2006 A. 2,240,000 UK businessesB. Number withrespiratory risk, needingLEV = 450,000 (20% oftotal UK businesses (A))C. Number with LEV =260,000-330,000 (60-73%of B) D. Number with tested LEV systems = 110,000-130,000 (32-49% of C.)
  • 13. Estimates by HSE 2006 A. 2,240,000 UK businessesB. Number withrespiratory risk, needingLEV = 450,000 (20% oftotal UK businesses (A)) How many of theseC. Number with LEV = tests are adequate?260,000-330,000 (60-73%of B) D. Number with tested LEV systems = 110,000-130,000 (32-49% of C.)
  • 14. Common problemswith LEV systems
  • 15. Inappropriatedesign
  • 16. Installationof inappropriate“off the shelf”systems
  • 17. Poordesign
  • 18. Unrealisticexpectations
  • 19. Inadequatemaintenance
  • 20. Inadequatetesting
  • 21.  Many systems are badly designed Unrealistic expectations of capabilities of LEV Poor standard of maintenance and testing
  • 22. http://www.hse.gov.uk/pubns/books/hsg258.htm
  • 23. Awareness Specification Design Installation Use
  • 24. Awareness Specification Design Installation Use
  • 25. Awareness • Recognise risk exists Specification Design Installation Use
  • 26. ExampleWelders exposed to fumeare at risk of contractingpneumonia, asthma,bronchitis, emphysema andcancer
  • 27. Awareness • Recognise risk exists • Evaluate exposure Specification • Identify sources Design Installation Use
  • 28. Understand the risk and whatsources contribute to it
  • 29. Identify all significantsources of exposure
  • 30. Here, dustcreatedduringemptying ofpowderfrom sackshas beencontrolledby installingan LEVsystem
  • 31. But they’veforgottenabout thedustgeneratedduring thedisposal ofthe sacks
  • 32. Sack emptyingwith LEV Sack disposal no LEV LEV for both operations
  • 33. Awareness • Recognise risk exists • Evaluate exposure Specification • Identify sources Design • Consider process change Installation Use
  • 34. Is there a better wayof doing the job thatwill reduce exposure?
  • 35. Awareness • Recognise risk exists • Evaluate exposure Specification • Identify sources Design • Consider process change Installation • Prepare specification Use
  • 36. The employer needs to provide prospectivesuppliers with the information they need todesign and build an effective LEV system
  • 37. Awareness • Recognise risk exists • Evaluate exposure Specification • Identify sources Design • Consider process change Installation • Prepare specification Use
  • 38. Awareness Specification Design Installation Use
  • 39. All engineeringcontrols,including LEV,need to beproperlydesigned
  • 40. Awareness • Select potential suppliers Specification Design Installation Use
  • 41. Awareness • Select potential suppliers Specification • Suppliers prepare designs a and quotations Design Installation Use
  • 42. Awareness • Select potential suppliers Specification • Suppliers prepare designs a and quotations Design • Supplier selected Installation Use
  • 43. The employer and the supplier need to worktogether to develop successful control solutions
  • 44. Awareness • Select potential suppliers Specification • Suppliers prepare designs a and quotations Design • Supplier selected Installation • Prototype? Use
  • 45. Awareness Specification Design Installation Use
  • 46. Awareness • Installation of system Specification Design Installation Use
  • 47. Installation Install according to specification Initial check that the system is operating correctly
  • 48. Installation Needs to be done in a safe manner
  • 49. Awareness • Installation of system • Commissioning Specification Design Installation Use
  • 50. Commissioning1. Ensure the system meets the design specification
  • 51. Commissioning2. Ensure the system achieves adequate control
  • 52. Commissioning3. Obtain baseline data for routine testing
  • 53. Awareness • Installation of system • Commissioning Specification • Handover Design Installation Use
  • 54. The supplier should provide aUser Manual and Log Book
  • 55. Awareness Specification Design Installation Use
  • 56. Awareness • Train users Specification Design Installation Use
  • 57. Awareness • Train users • Supervision Specification Design Installation Use
  • 58. It’s the employer’s duty to ensure thatthe system is properly used
  • 59. Employees should use the systemproperly and report any defects
  • 60. Awareness • Train users • Supervision Specification • Maintenance and testing Design Installation Use
  • 61. Maintenance and Testing Routine checks and tests Planned maintenance Through examination and test (TExT)
  • 62. Awareness • Train users • Supervision Specification • Maintenance and testing Design • TExT Installation Use
  • 63. HSE Guidance for TExT Visual examination Measure and evaluate technical performance Assessment of control
  • 64. Awareness Specification Design Installation Use
  • 65. Can be downloaded from http://www.hse.gov.uk/lev/guidance.htm
  • 66. CreditsThis presentation contains public sectorinformation licensed under the OpenGovernment Licence v1.0
  • 67. http://www.slideshare.net/mikeslatermike@diamondenv.co.ukhttp://diamondenv.wordpress.comTwitter: @diamondenvMike Slater
  • 68. Mike Slater, Diamond Environmental Ltd. (mike@diamondenv.co.uk) This presentation is distributed under the Creative Commons Attribution-NonCommercial-ShareAlike UK:International Licence

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