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