effective design and management of lev systems
DESCRIPTION
An outline of the principles and practice of effective design and management of local exhaust ventilation systems.TRANSCRIPT
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LEV
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LocalEV
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LocalExhaustV
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LocalExhaustVentilation
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LocalExhaustVentilation
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Local Exhaust Ventilation
hood
ducting
air cleaner fan
stack
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A. 2,240,000 UK businessesA. 2,240,000 UK businesses
Estimates by HSE 2006
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A. 2,240,000 UK businessesA. 2,240,000 UK businesses
B. Number with
respiratory risk, needing
LEV = 450,000 (20% of
total UK businesses (A))
Estimates by HSE 2006
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A. 2,240,000 UK businessesA. 2,240,000 UK businesses
B. Number with
respiratory risk, needing
LEV = 450,000 (20% of
total UK businesses (A))
C. Number with LEV =
260,000-330,000 (60-73%
of B)
Estimates by HSE 2006
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A. 2,240,000 UK businessesA. 2,240,000 UK businesses
B. Number with
respiratory risk, needing
LEV = 450,000 (20% of
total UK businesses (A))
C. Number with LEV =
260,000-330,000 (60-73%
of B)
Estimates by HSE 2006
How many of these are designed
properly?
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A. 2,240,000 UK businessesA. 2,240,000 UK businesses
B. Number with
respiratory risk, needing
LEV = 450,000 (20% of
total UK businesses (A))
C. Number with LEV =
260,000-330,000 (60-73%
of B)
Estimates by HSE 2006
And how many are maintained properly ?
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A. 2,240,000 UK businessesA. 2,240,000 UK businesses
B. Number with
respiratory risk, needing
LEV = 450,000 (20% of
total 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.)
Estimates by HSE 2006
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A. 2,240,000 UK businessesA. 2,240,000 UK businesses
B. Number with
respiratory risk, needing
LEV = 450,000 (20% of
total 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.)
Estimates by HSE 2006
How many of these tests are adequate?
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Common problems with LEV systems
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Inappropriate
design
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Installation
of inappropriate
“off the shelf”
systems
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Poor
design
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Unrealistic
expectations
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Inadequate
maintenance
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Inadequate
testing
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Many systems are badly designed
Unrealistic expectations of capabilities of LEV
Poor standard of maintenance and testing
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http://www.hse.gov.uk/pubns/books/hsg258.htm
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Awareness
Specification
Design
Installation
Use
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Awareness
Specification
Design
Installation
Use
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Awareness
Specification
Design
Installation
Use
• Recognise risk exists
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ExampleWelders exposed to fume are at risk of contracting pneumonia, asthma, bronchitis, emphysema and cancer
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Awareness
Specification
Design
Installation
Use
• Recognise risk exists
• Evaluate exposure
• Identify sources
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Understand the risk and what sources contribute to it
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Identify all significant sources of exposure
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Here, dust created during emptying of powder from sacks has been controlled by installing an LEV system
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But they’ve forgotten about the dust generated during the disposal of the sacks
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Sack emptying with LEV
Sack disposalno LEV
LEV for both operations
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Awareness
Specification
Design
Installation
Use
• Recognise risk exists
• Evaluate exposure
• Identify sources
• Consider process change
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Is there a better way of doing the job that
will reduce exposure?
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Awareness
Specification
Design
Installation
Use
• Recognise risk exists
• Evaluate exposure
• Identify sources
• Consider process change
• Prepare specification
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The employer needs to provide prospective suppliers with the information they need to design and build an effective LEV system
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Awareness
Specification
Design
Installation
Use
• Recognise risk exists
• Evaluate exposure
• Identify sources
• Consider process change
• Prepare specification
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Awareness
Specification
Design
Installation
Use
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All engineering controls, including LEV, need to be properly designed
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Awareness
Specification
Design
Installation
Use
• Select potential suppliers
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Awareness
Specification
Design
Installation
Use
• Select potential suppliers
• Suppliers prepare designs
a and quotations
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Awareness
Specification
Design
Installation
Use
• Select potential suppliers
• Suppliers prepare designs
a and quotations
• Supplier selected
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The employer and the supplier need to work together to develop successful control solutions
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Awareness
Specification
Design
Installation
Use
• Select potential suppliers
• Suppliers prepare designs
a and quotations
• Supplier selected
• Prototype?
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Awareness
Specification
Design
Installation
Use
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Awareness
Specification
Design
Installation
Use
• Installation of system
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Installation
Install according to specification
Initial check that the system is operating correctly
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Installation
Needs to be done in a safe manner
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Awareness
Specification
Design
Installation
Use
• Installation of system
• Commissioning
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Commissioning
1. Ensure the system meets the design specification
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Commissioning
2. Ensure the system achieves adequate control
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Commissioning
3. Obtain baseline data for routine testing
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Awareness
Specification
Design
Installation
Use
• Installation of system
• Commissioning
• Handover
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The supplier should provide a User Manual and Log Book
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Awareness
Specification
Design
Installation
Use
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Awareness
Specification
Design
Installation
Use
• Train users
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Awareness
Specification
Design
Installation
Use
• Train users
• Supervision
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It’s the employer’s duty to ensure that the system is properly used
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Employees should use the system properly and report any defects
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Awareness
Specification
Design
Installation
Use
• Train users
• Supervision
• Maintenance and testing
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Maintenance and Testing
Routine checks and tests
Planned maintenance
Through examination and test (TExT)
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Awareness
Specification
Design
Installation
Use
• Train users
• Supervision
• Maintenance and testing
• TExT
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HSE Guidance for TExT
Visual examination
Measure and evaluate technical performance
Assessment of control
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Awareness
Specification
Design
Installation
Use
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Can be downloaded from http://www.hse.gov.uk/lev/guidance.htm
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Credits
This presentation contains public sector information licensed under the Open Government Licence v1.0
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http://www.slideshare.net/mikeslater
http://diamondenv.wordpress.com
Twitter: @diamondenv
Mike Slater
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Mike Slater, Diamond Environmental Ltd. ([email protected])
This presentation is distributed under the Creative CommonsAttribution-NonCommercial-ShareAlike
UK:International Licence