Health and Safety Executive - British Occupational Hygiene ... · By National Institute for...
Transcript of Health and Safety Executive - British Occupational Hygiene ... · By National Institute for...
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Health and Safety Executive
© Crown Copyright, HSE 2016 HSL: HSE’s Health and Safety Laboratory
LEV and Exposure Control
Peter E J Baldwin CFMOH CPhys
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HSL: HSE’s Health and Safety Laboratory © Crown Copyright, HSE 2017
99%
health
148 workers died in accidents at work
Approx. 13,000 died from work related disease
Slide from
BOHS Breathe
Freely
campaign
Why bother ?
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HSL: HSE’s Health and Safety Laboratory © Crown Copyright, HSE 2016 © Crown Copyright, HSE 2016
Overview of talk
• Relevant legislation
• Examples of application of principles of good control
• Adequate control and LEV
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HSL: HSE’s Health and Safety Laboratory © Crown Copyright, HSE 2017
Legal requirements
• HSWA
• MHSW
• COSHH
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HSL: HSE’s Health and Safety Laboratory © Crown Copyright, HSE 2017
COSHH reg 7
Prevent exposure Adequately control exposure Apply hierarchy of control Implement principles of good control practice ALARP applies to certain substances Control to below WEL
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HSL: HSE’s Health and Safety Laboratory © Crown Copyright, HSE 2017
a) Designed to minimise emission of contaminant
b) Consider all routes of exposure
c) Choose controls proportionate to health risk
d) Ensure controls are effective, easy to use and reliable
e) Consider if PPE /RPE may also be needed to control risk
f) Regularly check controls work
g) Inform, train and instruct workers
h) Don’t increase other health and safety risks
Summary of Schedule 2A
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HSL: HSE’s Health and Safety Laboratory © Crown Copyright, HSE 2017
Hierarchy of control
More effective and reliable Less effective and reliable
Elimination
Substitution
Engineering controls
Admin. controls
PPE
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HSL: HSE’s Health and Safety Laboratory © Crown Copyright, HSE 2017
Process change (1)
• Use Low silica stone
• Use guillotine
• Automate process
• Use dust controls
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HSL: HSE’s Health and Safety Laboratory © Crown Copyright, HSE 2017
Process change (2) Enclose process
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HSL: HSE’s Health and Safety Laboratory © Crown Copyright, HSE 2017
All routes of exposure
By National Institute for Occupational Safety and Health (NIOSH) from USA - Recycling lead in a lead-acid battery recovery facility, Public Domain, https://commons.wikimedia.org/w/index.php?curid=5334658
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HSL: HSE’s Health and Safety Laboratory © Crown Copyright, HSE 2017
Control risk - Exposure control selection
Emission source
Control
User
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HSL: HSE’s Health and Safety Laboratory © Crown Copyright, HSE 2017
Segregation
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HSL: HSE’s Health and Safety Laboratory © Crown Copyright, HSE 2017
Ventilation
Displacement General
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HSL: HSE’s Health and Safety Laboratory © Crown Copyright, HSE 2017
DEEE -LEV
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HSL: HSE’s Health and Safety Laboratory © Crown Copyright, HSE 2017
DEEE - Procedural controls
• Turn off engines
• Run engines outside
• Maintenance of
– engines
– exposure controls
• Use exposure controls
• Minimise number exposed
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HSL: HSE’s Health and Safety Laboratory © Crown Copyright, HSE 2017
Effective controls - Hierarchy of control
! ! 1 2
3
Primary prevention is key!
Can you eliminate the risk?
Engineering controls
Protect the individual:
PPE/RPE: provision, use of correct RPE, face fit testing etc.
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HSL: HSE’s Health and Safety Laboratory © Crown Copyright, HSE 2016 © Crown Copyright, HSE 2016
Additional controls
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HSL: HSE’s Health and Safety Laboratory © Crown Copyright, HSE 2017
Check controls work
• Audits
• Monitoring
• Supervision and management
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HSL: HSE’s Health and Safety Laboratory © Crown Copyright, HSE 2017
Effect of Audits
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HSL: HSE’s Health and Safety Laboratory © Crown Copyright, HSE 2017
Training
Risks and controls
• How to use controls
• How to check and report faults
• Consequences of no control
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HSL: HSE’s Health and Safety Laboratory © Crown Copyright, HSE 2017
Overall risk not increased
By NASA - http://mediaarchive.ksc.nasa.gov/detail.cfm?mediaid=22787, Public Domain, https://commons.wikimedia.org/w/index.php?curid=2141434
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HSL: HSE’s Health and Safety Laboratory © Crown Copyright, HSE 2016 © Crown Copyright, HSE 2016
LEV and control
• LEV may be part of adequate control
• Hierarchy of control should be followed
• COSHH Schedule 2A should be followed
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HSL: HSE’s Health and Safety Laboratory © Crown Copyright, HSE 2017
Minimise emission
• Redesign work process
• Enclose process
• Design process for LEV
Elimination
Substitution
Engineering controls
Admin. controls
PPE
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HSL: HSE’s Health and Safety Laboratory © Crown Copyright, HSE 2017
All routes of exposure
• How will exposure occur?
Elimination
Substitution
Engineering controls
Admin. controls
PPE
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HSL: HSE’s Health and Safety Laboratory © Crown Copyright, HSE 2017
Control the risk
Capture zone and working zone
Elimination
Substitution
Engineering controls
Admin. controls
PPE
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HSL: HSE’s Health and Safety Laboratory © Crown Copyright, HSE 2017
Effective, easy to use and reliable
• Write specification
• Involve employees
• Think about ancillary tasks
– Testing, maintenance and decommissioning LEV
– Access to duct for cleaning Elimination
Substitution
Engineering controls
Admin. controls
PPE
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HSL: HSE’s Health and Safety Laboratory © Crown Copyright, HSE 2017
Will PPE /RPE be needed?
• MVR – LEV will control exposures to non-painters
• Painters still have high exposure
– Need RPE
• Clearance time
• Integrity Elimination
Substitution
Engineering controls
Admin. controls
PPE
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HSL: HSE’s Health and Safety Laboratory © Crown Copyright, HSE 2017
Check controls work
• Use of LEV
– Usability
• Maintenance
• Checks
– flow indicators
Elimination
Substitution
Engineering controls
Admin. controls
PPE
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HSL: HSE’s Health and Safety Laboratory © Crown Copyright, HSE 2017
Inform, train and instruct
• How does LEV work
• Position on hood
• Why LEV is needed
• User checks
HSE RR836
Elimination
Substitution
Engineering controls
Admin. controls
PPE
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HSL: HSE’s Health and Safety Laboratory © Crown Copyright, HSE 2017
Overall H&S
Elimination
Substitution
Engineering controls
Admin. controls
PPE
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HSL: HSE’s Health and Safety Laboratory © Crown Copyright, HSE 2017
Sources of information
• HSE website
– COSHH
– LEV
– COSHH Essentials
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OCCUPATIONAL EXPOSURE
MONITORING INSTRUMENTS AND HOW THEY OPTIMISE LEV FILTRATION
Maxine Dolloway
Direct Sales Specialist, TSI Instruments
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Agenda
+ Introduction to TSI
+ Reasons for air sampling
+ Typical particle sizes
+ Measurement techniques
+ Use of real time instruments with LEV filtration
+ Summary
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TSI INSTRUMENTS….
WHERE RESEARCH MEETS REALITY
+ Founded in 1961 by University of Minnesota graduates
+ Privately-held company as part of Churchill Industries holdings
+ Over 600 employees worldwide
+ Corporate headquarters based in Shoreview, MN with field offices throughout Europe and Asia
• Offices in Germany, United Kingdom, France, China, Singapore and India
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TSI INSTRUMENTS…
WHERE RESEARCH MEETS REALITY
+ Industry leader in the design and production of precision measurement instruments
+ Partnerships with research institutions and customers around the world to set the standard for measurements relating to aerosol science, air flow, health and safety, indoor air quality, environmental monitoring, fluid dynamics and biological detection.
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OCCUPATIONAL HEALTH
AND SAFETY
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Why do we need to sample air ?
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Reasons for Air Sampling
• Health Protection
• Environmental Protection
• Compliance with Government Legislation
• Product Protection
• Process Protection
• Protection from compensation claims
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Particles Size Perspective
Human Hair ± 150 µm
Visible Airborne Debris 25 µm
Heavy Atmospheric Dust 10 µm
Avg. Atmospheric Dust 5-10 µm
Ultrafine Particles < 0.1 µm
Metallic Fumes 0.3-1 µm
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Airborne Hazards
(30µ)
(10µ) (4µ)
Gases & very small
particles can reach
the deepest areas
of the lungs
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Typical Particle
Sizes
2/13/2017 © TSI Incorporated 91
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Find and Control Pollutant Sources
You can’t solve a
Problem you can’t
find!
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Measurement Methods
2. Aerosol Mass Concentrations
1. Gravimetric Sampling
3. Particle Counting
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Gravimetric Sampling
HSE Standard MDHS 14/3
+ Method for Determining Hazardous Substances
+ Weight in mg/m3 & analysis by laboratory
+ 2-3 week turn-around time
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Personal Monitoring
ALL Exposure limits
are based on
PERSONAL SAMPLES
over an 8 Hour
Period
MUST be taken in the
Breathing Zone
30 cm Sphere
around the nose and mouth
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Sampling Results
+ Laboratory identifies Amount of Hazard Collected (mg)
+ Amount of Air Pumped is identified by the Pump (m3)
+ Occupational Hygienist can Calculate mg/m3
+ If amount is too high – Corrective Action is Mandatory!
But what happened?
Was it over the limit all of the time?
Or were there Peaks during the 8 hour sample?
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Real Time Monitoring
TIME
Diagnostic Instruments find
problems
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Measurement Methods
2. Aerosol Mass Concentrations
1. Gravimetric Sampling
3. Particle Counting
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Aerosol Monitor
+ - Mass Concentration Indicative measurement in mg/m3
+ - Graphical representation
+ - Instantaneous readings
DANGER ZONE oil fume/mist
airborne dust virusses colour pigment pollen
bacteria hairs tobacco smoke coal dust
carbon black cement dust milled flour
0 0,01 µm 0,1 µm 1 µm 10 µm 100 µm (0,1 mm) visible by electron microscope visible by microscope visible by eye
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Revolution in Real-time Monitoring
The DustTraks are:
• Continuous
• Real-time
• Single Channel
• 90 degree light scattering photometers
They are used to
determine the
mass concentration
of dust aerosols
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DUSTRAK II
Handheld Models • Lightweight
• Perfect for Walkthrough Surveys
• Single Point Data Collection
• Manual and Programmable Data Logging
• Rechargeable Li-Ion Battery
• Concentration up to 150mg/m3
• Free TrakPro Download Software
Desktop Models
• Ideal for Long Term Surveys
• Remote Monitoring Applications • Manual and Programmable Data Logging
• Rechargeable ‘Hot Swap’ Li-Ion Batteries
• Concentration up to 400mg/m3
• Collects Gravimetric Samples
• Free TrakPro Download Software
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DUSTRAK DRX
Handheld Models • Lightweight
• Perfect for Walkthrough Surveys
• Single Point Data Collection
• Manual and Programmable Data Logging • Rechargeable Li-Ion Battery
• Concentration up to 150mg/m3
• Free TrakPro Download Software
Desktop Models
• Ideal for Long Term Surveys
• Remote Monitoring Applications
• Manual and Programmable Data Logging
• Rechargeable ‘Hot Swap’ Li-Ion Batteries • Concentration up to 400mg/m3
• Collects Gravimetric Samples
•Free TrakPro Download Software
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Personal Aerosol Monitor
+ TSI SidePak AM520
+ Wear like a Sampling Pump
+ 50 cc/min to 3 Ltr flow range.
+ Particle sizes 0.8, 1.0, 2.5, 4.0,& 10 µm + Static & personal monitor + TrakPro 5 software
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Ultrafine Particle Counter
+ TSI P-Trak
+ New concept for air monitoring
+ Particles sizes <1um
+ Measured in particles / cc
DANGER ZONE oil fume/mist
airborne dust virusses colour pigment pollen
bacteria hairs tobacco smoke coal dust
carbon black cement dust milled flour
0 0,01 µm 0,1 µm 1 µm 10 µm 100 µm (0,1 mm) visible by electron microscope visible by microscope visible by eye
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P-Trak in the Workplace
Measurements can be used to find
sources in the workplace of
• Ultra-fine Particles
• Nanoparticles
This helps evaluate the effectiveness
of corrective actions or engineering
controls.
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TRAKPROTM
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TRAKPROTM
Choose from several presentation
styles and curve fitting choices
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Real time monitoring in
LEV commissioning
Used in 3 stages:
1. Before commissioning
2. At commissioning
3. After installation
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Real time monitoring in
LEV commissioning
Before commissioning:
+ Identify baseline (indoors vs outdoors)
+ Walk through survey identify sources of particulate (real time peaks)
+ Helps in design and installation stage of LEV
+ Makes sure LEV system captures particulate at source
+ Using workplace and personal monitoring
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Real time monitoring in
LEV commissioning
At commissioning stage:
+ Check filters are undamaged
+ Check fitting of filters has been done correctly
+ Check no particulate is passing through
+ Particularly important if system recirculates air
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Real time monitoring in
LEV commissioning
After installation:
+ Check filters are still fitted correctly
+ Check for damage
+ Workplace and personal monitoring
+ Continuous monitoring?
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Summary
+ Importance of particulate monitoring
+ Real time vs gravimetric
+ TSI range of real time dust monitors
+ Personal (breathing zone) vs workplace
+ Aids all three stages of commissioning LEV
+ Helps to maintain a healthy environment for workers
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QUESTIONS ?
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RECIRCULATING LEV SYSTEMS
THE PROS AND CONSRichard Topliss – Croft Occupational Hygiene Ltd
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Types of recirculating systems Particulates
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Types of recirculating systems Particulates
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Types of recirculating systemsGases and vapour
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What do HSE say?
■ COSHH ACOP: Examples of the information which should be available in respect of the main components of the LEV system include (for) systems which return exhaust air to the workplace: filter efficiency; and concentration of contaminant in returned air.
■ HSG258: Controlling airborne contaminants at workRecirculating extracted air is a way to save energy and reduce heating or cooling costs. It also reduces the need to consider make-up air. Recirculation is easier with:– contaminants which are particles;– low concentrations of airborne contaminant compared with the ‘benchmark’ value
(Chapter 3);– relatively small LEV systems; and– lower toxicity materials.
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What do HSE say?
■ The air cleaner is the most important part of a recirculation system. It must matchthe contaminant and its concentration. Recirculation is acceptable as long as the air is thoroughly cleaned. Recirculation may be inappropriate when failure of a component, such as an air cleaner, could result in dangerous conditions. Under these circumstances, any recirculation system should incorporate monitoring and alerts, for example:
– an alarm for a blocked or failed filter, eg a pressure gauge for continuous monitoring;
– an advanced detection system connected to alarms and a system to divert recirculated air out of the workplace.
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So what are the pros and cons
Pros■ Easy to install (& move)
■ No replacement air needed
■ Lower energy use - heated / cooled air not thrown away
■ Often lower initial cost
■ “No” environmental emissions
Cons■ “Dangerous” air emitted
■ No clear standards to test against
■ High cost of filters
■ Often higher maintenance
■ Noise
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Acceptable concentrations in returned air?■ Carcinogens
■ Respiratory sensitisers
■ Flammable vapours
■ No contaminant detectable?
■ Contaminant below WEL?
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Case Study
Recirculating fume cupboards introduced into oil field laboratories
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Case Study
Recirculating air from welding fume extraction in a fabrication shop
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Case Study
Recirculating air from soldering process extraction into the workplace
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Case Study
Recirculating air from wood dust extraction
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Recirculation – pros and cons
■ Sometimes it might be the best option BUT■ Consider the whole cost throughout the
lifetime of the equipment■ Consider whether you can be assured that it is
always going to control the health risk
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CONTACT:
Richard Topliss CMFOH, DipOH
Croft Occupational Hygiene Limited
Mobile: +44 (0)7803 721424
Email: [email protected]
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CHOOSING THE BEST FAN
Scott Harding
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Who can make fans…
So here’s what you should look out for…..
…..Anyone!
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Applied National & Harmonized Standards
• Machinery Directive (2006/42/EC)
• EMC Directive (2004/108/EC)
• Low Voltage Directive (2006/95/EC)
• ISO9001:2015
• ATEX Directive 2014/34/EU
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Who can you talk too?
Selecting the correct Fan Supplier
Engineers Designers
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• Information relevant to basic fan selections.
• Installation required to avoid system effects.
• ATEX-Certified fans.
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Today’s topics to help you understand your requirements and enable the fan supplier
to select a suitable fan.
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• Flow Rate – Actual, Standard and Normal
Units (m³/s, m³/hr, cfm, l/s)
• Fan Pressure Units: Pa, kPa, mbar, mmWg, insWg
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Basic info required to select a fan
• Static Pressure?
Is the temperature related to the
specified pressure
Pressure split between fan inlet and discharge
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Basic info required to select a fan
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• Power supply (Voltage/Phase and Frequency)
• Maximum operating temperature – Requirement for cold start would also need to be known.
• Minimum fan efficiency ?
• Climatic condition high ambient conditions.
• Is the fan handling corrosive , erosive, explosive gas/dust?
• Material handling – Type and size of material
– Concentration
• Is the fan to be driven by inverter?
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More things to think about… Operating Conditions
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1) Choosing the correct fan/impeller
• Product handling
• Clean air only
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Air enters and exits axially Generally suited for moving large volumes of clean air at low pressures.
Generally low efficiencies- 50%-60%.
Axial
Clean air Maximum temp 50°C
Clean air Maximum temp 50°C
Clean air Maximum temp 250°C
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Example of Axial fan performance curve
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Example of Axial fan performance curve
7o 12
o 17o
22o
27o 32
o 37o
42o
0
500
1000
1500
2000
2500
3000
0.0 20.0 40.0 60.0 80.0 100.0 120.0 140.0
Volume m³/s
Sta
tic
Pre
ssu
re P
a
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Centrifugal
Direct driven
Belt driven
Air enters axially & exits at 90°. Can be used for Clean air or Dirty air
Single inlet-all air is drawn in through one inlet Double Inlet Air is drawn from both sides
Double Inlet
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Velocity profile through a centrifugal fan.
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Paddle Bladed Backward Bladed Forward curved
Centrifugal Impeller Types
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Variable Speed Drive (Inverter) control
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– Fans will only meet the duty point shown on the performance curve under “ideal” installation conditions.
– Ideal conditions are seldom obtainable in practice consequently there will always be some “SYSTEM EFFECT”.
A number of steps can be taken ensure the correct fan is installed correctly for your customer!
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Ensuring your fan is free from System Effects
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Factors that influence system effect on fan:
• Elbow or bend too close to fan inlet or outlet
• Abrupt duct transition before/after fan
• Pre swirl of the incoming air due to duct design (Swirl in same direction as rotation)
• System dampers not fully open
• Damper location
• Fan inlet or outlet too close to wall or bulkhead
• Bend orientations at fan discharge
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2) Avoid duct system design faults
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Abrupt inlet installations
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Inlet duct bends
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COUNTER-ROTATION AIR SWIRL IN OPPOSITE DIRECTION
TO IMPELLER ROTATION
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Inlet swirl due to inlet direction
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Effects on duty with fan inlet swirl
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Good Discharge Duct Poor Discharge Duct Acceptable Discharge Duct
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Fan orientation and duct outlet direction
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3) Bad flexible connection installation effects fan performance
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Ideal fan installation – AV mounts with Flexible connections
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• Fan Performance Problems
• Fan Starting Problems
• Fan Mechanical System Problems
• Fan running inefficiently causing additional noise & running costs!
• Unlikely repeat business
In summary, what a bad installation means for you and your customer…
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ATEX “Design of fans working in potentially explosive
atmospheres” BS EN 14986 : 2007
This is the foundation for any fan being produced to
comply with the ATEX 2014/34/EU Directive
Final chapter: Is the fan you’re installing legally suitable?
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2014/34/EU The updated ATEX standard was
introduced in April 2016
Do you have all the technical documentation with the fan?
• Manuals, Equipment Category Marking on Fan & Motor.
• Is CE marking shown.
• How is it certified? 3rd party tested with certificates?
Please remember you are responsible for the equipment you install
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• 2014/34/EU compliant
• 14986:2007 compliant (14986:2017)
• Independently certified for ATEX compliance
• And that the fan is not 94/9/EC
Check the next ATEX fan you purchase for a hazardous application is….
Otherwise you and your customer may be at risk?
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Thank you for listening, I hope it has been interesting
Do you have any questions?
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LEV – EXTRACTING BEST PRACTICE'S
LEV FOR BULK MATERIAL HANDLING EQUIPMENT
Southdowne Solutions Ltd
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LEV FOR BULK MATERIAL HANDLING EQUIPMENT
Southdowne Solutions Ltd
Introduction LEV and COSHH LEV and DSEAR Review available guidance Comment on shortfall in the guidance with relation to BMH Equipment
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LEV FOR BULK MATERIAL HANDLING EQUIPMENT
Southdowne Solutions Ltd
Large scale biomass handling system at Lynemouth Power Station
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LEV FOR BULK MATERIAL HANDLING EQUIPMENT
Southdowne Solutions Ltd
Large scale biomass handling system at Drax Power Station
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LEV FOR BULK MATERIAL HANDLING EQUIPMENT
Southdowne Solutions Ltd
Large scale biomass handling system at Port of Tyne/Immingham Etc
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LEV FOR BULK MATERIAL HANDLING EQUIPMENT
Southdowne Solutions Ltd
These large scale biomass handling system all incorporate LEV systems throughout They also all utilise belt conveyors for transfer Belt conveyors tend to present the biggest challenge Review problem areas and suggest some solutions…
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FACTORS THAT INFLUENCE THE LEV DESIGN
Southdowne Solutions Ltd
Chute design and transfer height Conveyor containment Transfer rate and belt speed Material dustiness and dust return systems…
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CHUTE DESIGN - IDEAL CHUTE GEOMETRY
Southdowne Solutions Ltd
Transfer height <3M Straight not twisted transfer Hood and Spoon type geometry Minimise openings especially at the top of the transfer Matched velocity, top and bottom Various guidelines that will help the chute designer…
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CHUTE DESIGN – SUB-OPTIMAL GEOMETRY
Southdowne Solutions Ltd
Transfer height 20m Twisted transfer Hood and Spoon geometry not possible Air induction via diverter valves High velocity at impact Very little guidance available for the LEV engineer to compensate for this…
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CONVEYOR CONTAINMENT
Southdowne Solutions Ltd
IMPORTANT ELEMENTS: Rear seal and side skirt boards and seals Transfer point location (Avoid flat to trough transition) Impact plates in chute to avoid heavy contact with skirt seals Skirt joints should be eliminated if possible Impact rollers or sliding bed plates required Settling chamber dimensions and hood locations Good guidance in the conveyor guides…
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BELT SPEED
Southdowne Solutions Ltd
LEV flow rate proportional to throughput The faster the belt the higher the LEV flow rate needs to be But how much higher? Dust lift off after transfer points at high speeds Roller ‘Patter’ Variable rate Variable speed or variable burden? Intermediate LEV between transfers…
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MATERIAL DUSTINESS
Southdowne Solutions Ltd
The dustier the material, the more extraction is needed But how much more? 2800TPH wood pellets 5% dust 140TPH fine dust Dust Collection: Spot filter that drops dust back on top of the pile? Local extraction that returns the dust under the pellets Central extraction with dust removal…
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LEV GUIDANCE IN RELATION TO BMH
Southdowne Solutions Ltd
ACGIH INDUSTRIAL VENTILLATION GUIDE CEMA BELT CONVEYOR GUIDE MARTIN BELT CONVEYOR GUIDE NIOSH DUST CONTROL HANDBOOK MHEA TROUGH CONVEYOR GUIDE…
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FACTORS THAT INFLUENCE LEV DESIGN
Southdowne Solutions Ltd
Chute design and transfer height Conveyor containment Belt speed Material dustiness and dust return Systems…
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FACTORS THAT INFLUENCE LEV DESIGN
Southdowne Solutions Ltd
Chute design and transfer height All recognise the benefit of good chute design and recommend “hood and spoon” approach ACGIH Adds extraction at the top of transfers over 3m but does not differentiate between 3m or 30m CEMA/NIOSH/MARTIN allows a calculation for actual transfer height MHEA makes no allowance…
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FACTORS THAT INFLUENCE LEV DESIGN
Southdowne Solutions Ltd
Chute design and transfer height Conveyor containment All recognise the importance of good Containment But only CEMA/NIOSH/MARTIN account for increased extraction airflow by calculating induced air through defined openings…
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FACTORS THAT INFLUENCE LEV DESIGN
Southdowne Solutions Ltd
Chute design and transfer height Conveyor containment Belt speed All link extraction airflow to belt speed But all only on the basis of above or Below 1M/S…
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FACTORS THAT INFLUENCE LEV DESIGN
Southdowne Solutions Ltd
Chute design and transfer height Conveyor containment Belt speed Material dustiness and dust return systems ACGIH adjusts airflow for dusty materials But does so fairly subjectively CEMA/NIOSH/MARTIN calculate airflow based on mean particle size But is this adequate?
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COMPARISON OF LEV CALCULATIONS
Southdowne Solutions Ltd
AIRFLOW RATES IN M3/Hour
CEMA ACGIH
TOP AIRFLOW 4600 5600
BOTTOM REAR AIRFLOW 3500 2400
BOTTOM FRONT AIRFLOW 10400 5600
TOTAL AIRFLOW 18500 13600
CEMA 36% Higher
APPLICATION: 2500 TPH PELLET 3M TRANSFER 3M/S BELT SPEED
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EFFECT OF BELT SPEED
Southdowne Solutions Ltd
AIRFLOW RATES IN M3/Hour
CEMA ACGIH
TOP AIRFLOW 4600 5600
BOTTOM REAR AIRFLOW 3500 2400
BOTTOM FRONT AIRFLOW 10400 5600
TOTAL AIRFLOW 18500 13600
No Change No Change
APPLICATION: 2500 TPH PELLET 3M TRANSFER 1.5M/S BELT SPEED
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EFFECT OF HIGH DUST CONTENT
Southdowne Solutions Ltd
AIRFLOW RATES IN M3/Hour
CEMA ACGIH
TOP AIRFLOW 5500 11200
BOTTOM REAR AIRFLOW 4200 4800
BOTTOM FRONT AIRFLOW 12400 11200
TOTAL AIRFLOW 22100 27200
120% Increase 200% Increase
APPLICATION: 2500 TPH PELLET 3M TRANSFER 3M/S BELT SPEED 70% Broken pellets 10mm long 30% Fines <3.0mm 5% Dust >0.1mm
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EFFECT OF 6M TRANSFER
Southdowne Solutions Ltd
AIRFLOW RATES IN M3/Hour
CEMA ACGIH
TOP AIRFLOW 6800 5600
BOTTOM REAR AIRFLOW 5100 2400
BOTTOM FRONT AIRFLOW 15300 5600
TOTAL AIRFLOW 27200 13600
150% Increase No Increase
APPLICATION: 2500 TPH PELLET 6M TRANSFER 3M/S BELT SPEED
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MODIFIED ACGIH
Southdowne Solutions Ltd
AIRFLOW RATES IN M3/Hour
CEMA ACGIH
TOP AIRFLOW 8200 11200
BOTTOM REAR AIRFLOW 6200 4800
BOTTOM FRONT AIRFLOW 18500 18000
TOTAL AIRFLOW 28900 34000
APPLICATION: 2500 TPH PELLET 6M TRANSFER 3M/S BELT SPEED 70% Broken pellets 10mm long 30% Fines <3.0mm 5% Dust >0.1mm
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FACTORS THAT INFLUENCE THE LEV DESIGN
Southdowne Solutions Ltd
Chute design and transfer height Conveyor containment Belt speed and throughput Material dustiness and dust return systems The affect of these parameters isn’t covered in much detail DSEAR This isn’t covered at all…
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FULL CONVEYOR CONTAINMENT
Southdowne Solutions Ltd
As we have seen, the performance of a dust control system depends heavily on both containment and LEV The guides we have reviewed suggest containment should be the first line of attack and suggest full enclosure for toxic materials It might be tempting to fully enclose both strands of a belt conveyor handling wood pellets But not a great idea if the product is potentially explosive Something I’ve heard called “Doing an Imperial Sugar” in the BMH industry (CSB Safety Video-Imperial Sugar)
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DSEAR - STATUTORY INSTRUMENT 2002 NO. 2776
Southdowne Solutions Ltd
User Directive (ATEX 137/DSEAR): The employer must implement the regulations of the user directive Equipment Directive (ATEX 100A) The equipment manufacturer / importer must implement the regulations of the equipment directive
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IDENTIFICATION OF FLAMMABLE ATMOSPHERES
Southdowne Solutions Ltd
Equipment directive - identifies flammable atmospheres inside the equipment.
User directive - identifies flammable atmospheres outside of equipment.
The user and manufacturer / importer need to exchange information so the zones and equipment
can be prescribed accordingly.
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WHEN CAN AN EXPLOSION OCCUR?
Note: oxidant is most commonly air which contains 21% oxygen
Southdowne Solutions Ltd
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HAZARD ZONES – DEFINITIONS (DUST)
Southdowne Solutions Ltd
Zone 20 An area in which there is either always, for long periods or often the presence of an explosive atmosphere in the form of a cloud of flammable dust
Zone 21 …during normal operation, likely that an explosive atmosphere in the form of a cloud of flammable dust exists
Zone 22 …unlikely to exist. If, however an explosive atmosphere does occur, it will exist for a short period only
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HAZARD ZONES IN CHUTES AND CONVEYORS
Southdowne Solutions Ltd
Enclosure of the top strand is common With conventional roller supported conveyors this is achieved by adding covers and a deck plate between the top and bottom strands Build-up will occur internally in chutes and on deck plates and if product is potentially explosive these internal areas (at least) must be hazard zoned Air supporting the top strand on a continuous plate is a successful way of eliminating the problem (between transfers!)…
Biomass
Deck Plate
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CONTROL OF IGNITION SOURCE
Southdowne Solutions Ltd
With this type of plant, elimination of Oxygen is not really practical
Either control the ignition sources
Or prevent formation of viable explosive atmospheres
Elimination of ignition source is also extremely difficult
Mechanical and electrical ignition sources – Use ATEX certified equipment
But ATEX certification for mechanical equipment usually relies on elimination of foreign bodies, which again is usually impossible
Ignition sources such as embers being transferred from one zone to another can be impractical to eliminate and difficult to control
Control of the hazard zone is therefore more practical and this is where LEV can play its part…
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CONTROL OF FLAMMABLE ATMOSPHERE
Southdowne Solutions Ltd
Installation of a well designed LEV system can reduce a zone 20 atmosphere in a transfer chute to a zone 21
This significantly reduces the probability of an explosion
The belt conveyor between transfer points might typically classified as zone 22
A 3mm dust layer on the deck plate of a 2m wide conveyor will reach 50gms/m3 is raised into a cloud and this is above the LEL for wood dust
It might be possible to eliminate such internal dust layers with well designed dust extraction system at the transfer points that avoids returning the dust to the belt
But belt speed must be low enough to prevent any dust present being lifted off during conveying
(Or intermediate dust extraction between transfers could be provided)…
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SUMMARY
Southdowne Solutions Ltd
On new plant, a design which can satisfy the requirements of both COSHH and DSEAR will require close co-ordination of the chute designer, the conveyor designer and the LEV supplier On existing plant it will usually fall to the LEV Engineer to provide a dust extraction system that can compensate , as far as is possible, for the chute design installed There is relatively little guidance on LEV for sub- optimal transfer point geometries Its the same with the conveyor containment, although this is usually easier to upgrade than the transfer point geometry
leaks cannot be compensated by LEV!
LEV has an important part to play in reducing hazard
Zones and therefore reducing the probability of an explosion Either way, new or existing, I hope this presentation will have identified some points to look out for…
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Southdowne Solutions Ltd
Any Questions? Thanks to Gexcon Ltd, Shepherd Construction and NIOSH for some of the images [email protected]
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Health and Safety Executive
Health and Safety Executive
HSE Steps to Supporting
LEV Good PracticeResearch, Guidance,
Communications & Enforcement
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A few words about me
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Why occupational health?
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Communication challenges around LEV…
• Has a hood or enclosure that captures or
contains the harmful substances;
• Uses duct work and fans to remove the
harmful substances;
• Requires regular maintenance especially
when filters are used to clean the air
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Good practice example
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Employers sold inappropriate and expensive LEV
systems that don’t work
LEV Systems: problems
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Health Intervention Initiative
• Proactive inspections in industries with known
health risks
• Inspections leading to increased enforcement
and intelligence on exposure control
• Development of support materials highlighting
poor control in key industries
• Specialist inspector occupational hygiene
support for enforcement on control
• Re-focus away from risk assessment to control
of risk
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Health Interventions Initiative –enforcement on LEV
• No LEV!
• No thorough examination and test
• No records of maintenance
• Capture hoods without any means of
extraction
• Hoods too small
• Duct work damaged
• Poor extraction
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HSE Guidance
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RPE website visitors 2013/2014
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Nov-13respiratory-
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Series1 Series2 Series3
Visitors
Visits
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LEV visits and downloads May 2016
Visitors
Visits
Page requests
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LEV website homepage
This website provides practical advice for
employers and employees on buying and
using LEV and what to do to comply with
the law. It will help designers, installers
and examiners work with their customers
to control airborne contaminants
effectively.
LEV calculations - Conversions, Air density, Air velocity
Common processes - Processes and the dust sources they create
FAQ – Air flow measurement, TExT, Examiners
Resources – HSE guidance and ILEVE
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Research in progress or recently completed
1. Development of a quantitative test to measure
LEV capture efficiency
2. Review of European Standards to address
shortcomings in relation to spray booths
3. Design specification for extraction enclosure
hoods for small and medium sized bakeries
4. Efficiency of controls for silica dusts in stone-
working
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Measuring Capture Efficiency
Point A
Point B
Point M
% Loss
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Benefits and Issues
Benefits (potential)
• Influence better design
• Regulatory checks
• Duty holder confidence
• Energy savings
• REACH demonstration of
control
• Occupational hygiene
routine check
Issues
• Cost
• Analytical technique
– Infra red
– Light scattering
• Source
– SF6
– Freon 22
– Arizona dust No 3
• Method errors in
comparison with process
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Improving LEV in Local Metropolitan Areas project
• Working with Chambers of Commerce
and LEV suppliers
• Aimed at devising information and
messages for employers, supervisor and
purchasing departments
• Helping industry identify and locate
trusted and competent designers and
suppliers of LEV
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Objectives
1. Identify three Metropolitan Areas that have sufficient
industry to benefit from an LEV campaign.
2. Produce communications information and case
studies to provide:
• Awareness of hazard and risk in tasks that can be
effectively controlled through LEV
• Information on how to locate LEV suppliers and
assess supplier competence that can be used by
employers to help purchase effective LEV systems
• Operational knowledge to commission LEV and
maintain effectiveness
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Objectives (cont)
3. Devise a plan and funding to deliver three campaigns
including:
• Breakfast events
• Magazine articles
• Direct e-mails
4. Consolidate campaign communications with an on-line
resource of information and case studies.
5. Seek assistance in delivering the information by
identifying health orientated non-government
organisations and LEV suppliers and their representative
organisations.
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Challenges
• LEV provided that does not control the
risks
• Developments in LEV design
• The need to change dutyholders so they
are intelligent customers
• Some consultants providing expensive
advice which doesn’t really assist
dutyholders