lev definition

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Federal and California Light-Duty Vehicle Emissions

California standards known as the LEV I LEV II and LEV III Programs These standards apply to all passenger vehicles which include light-duty vehicles (i e cars) light-duty trucks (e g small pickup trucks) and medium-duty passenger vehicles (e g certain larger configurations of SUVs); all vehicles are affected regardless of which fuel

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Local Exhaust Ventilation (LEV) Guidance

This guidance is written for employers managers employees and their safety representatives and those who provide install and maintain local exhaust ventilation (LEV) systems In preventing exposure to harmful substances in the workplace there is a hierarchy of control measures that must be considered commencing with the elimination or substitu

PDF	Local Exhaust Ventilation Local Exhaust Ventilation (LEV): Engineering control system to reduce exposures to airborne contaminants such as dust mist fume vapor or gas in the workplace Roles and Responsibilities Environmental Health and Safety will:

Chapter 1 Summary

This guidance is written for employers, managers, employees and their safety representatives and those who provide, install and maintain local exhaust ventilation (LEV) systems. In preventing exposure to harmful substances in the workplace, there is a hierarchy of control measures that must be considered, commencing with the elimination or substitu

The main LEV elements are:

A hood of some kind, where the contaminants enter the system Ducting, which safely transports the contaminants to a filter/cleaner/exhaust point Air cleaner/filter/scrubber Air mover: a fan to power the system Discharge: a safe point of air exhaust When using LEV to control exposure, the employer must thoroughly assess the hazards to be controlled

When installing LEV:

Identify and assess the hazard(s) to be controlled Identify competent contractors to install the system Provide the installer with clear requirements or specifications Review and ensure that the design and its specifications are satisfactory Obtain and retain all the related paperwork in design specifications, including the commissioning report (h

Chapter 2 Introduction

Local exhaust ventilation (LEV) is an engineering system frequently used in the workplace to protect employees from hazardous substances. To have an efective system it is important that it is well designed and installed, used correctly and properly maintained. All the participants, from designer to end-user need to work together to provide an efe

Common Problems

Employers are often unaware their employees are being over-exposed to hazardous substances or that existing controls may be inadequate Sources of exposure are missed Employers (and suppliers) are over-optimistic about the efectiveness of the controls Existing controls have deteriorated Controls are not used correctly Employers need to work with de

Control

When control is being considered there is a standard hierarchical approach. Can the process be changed so that the hazardous chemical agent can be eliminated or substituted with a less hazardous one? Can the process be modified to reduce risk of exposure (for example can the process temperature be lowered to reduce vapour release)? Are engineering

Chapter 3 What is Local Exhaust Ventilation (LEV)?

In its simplest terms local exhaust ventilation is an engineering system to protect employees from exposure to hazardous substances by containing or capturing them locally, at the emission point. Local exhaust ventilation (LEV) is only one of many engineering control options that may be used to remove and prevent employee exposure to vapour, mist,

Performance & Examination Competent Persons Maintenance & Repair Engineers

Local Exhaust Ventilation Users Supplier & Designer, Installer & Commissioner hsa.ie

Good design and fit for purpose

Good design and being fit for purpose are the crucial initial considerations to ensure the efectiveness of the system. Where the process changes and additions or changes are needed the overall design should be reconsidered so the system remains efective. Creeping additions and extensions of the system can be a temptation for expediency, but lead to

Examples of poor design:

The extract fan system is sized too small and the hood cannot contain or capture the contaminants. The fume hood is placed in an area where there is sporadic cross draughts or insuficient supply air and the inward flow is challenged. A hood may have been designed without proper consideration of the work being done; the fit is incorrect and it may

Elements of LEV system:

Most systems have the following five elements: An inlet/enclosure/hood where the contaminant is captured or contained and enters the LEV. Ducting: This conducts air and the contaminant from the hood to the discharge point. Air cleaner or filter: This filters or cleans the extracted air. Not all systems need air cleaning. Air mover: The fan and moto

HOOD

Rim or lip extraction Push-pull system Downdraught table Low volume high velocity (LVHV) The type of hood or enclosure is influenced by the work being done. The hood or enclosure should not obstruct or cause ergonomic dificulties (e.g. manual-handling limitations or over-reaching). The hood/enclosure may need to be designed to capture/contain dust

3. Air filtering, collection or cleaning system:

The contamination removal/filtering system should be fit for purpose. The type of system used will be very much dictated by the type of contaminant being extracted and can vary from a simple filter system to a multi-component system with pre-filters and scrubbers, for example. Whatever the filtering system, it should be designed so that it can c

4. Air mover or fan:

The air mover needs to be suitable for use. It will need to provide a suficient air-flow rate to eficiently extract the contaminant, including a suficient in-duct velocity to transport the contaminant to the cleaning/filtering system and prevent flammable material, for example, depositing within the ducting. The air mover should be able to cope

5. Discharge system:

The discharge ducting should be placed so that it does not afect any air-supply system. The air being exhausted should not be entrained and recirculated into the workplace through the air- supply system. hsa.ie

Advantages of LEV

Properly positioned LEV and/or well-designed units will capture emissions at source and so protect the employee from exposure The general supply/exhaust ventilation air volume can be reduced as it is not relied upon to dilute contaminants. hsa.ie

DOWN-FLOW ROOM/BOOTH

Ducting: This conducts air and the contaminant from the hood to the discharge point. Branches should come into mains off the side if possible rather than from underneath Main duct Bend Bend Junctions Sufficient inspection ports with easy access Branch ducts Horizontal ducting with adequate carrying velocity. Ducting of increasing size to accommodat

Air cleaner or filter types:

Cleaned air out Collector plates Dust Voltage control box Dirty air in collection hopper Electrode wires 2m approx Dirty Clean Cleaned air air out Dirty air in air Dirty Dirty air swirls air swirls around outside around of chamber, outside throwing of chamber, off dust throwing of dust Dust falls into collection Dust falls hopper into collection ho

Boundary Bound layer

Air inlet Low discharge stack relative to building height Air inlets on roof and wall hsa.ie

Example: Heavier-than-air aerosol

Is this how Hexane ows out of a mixer? Is this how Hexane ows out of a mixer and is sucked away by the LEV slot? How Hexane-air mixture really ows Misconception hsa.ie

Case Study:

Sack emptying, with LEV control with no LEV control Canopy hoods do not protect people directly involved in hsa.ie

a process

They do not protect operators working on the hot process and/or handling hot/warm product hsa.ie

Chapter 6 Properties of Airborne Contaminants

Air contaminants mix with the air to form aerosols. The air can be contaminated with gases, vapours, mist, dust, fumes and fibres. Examples of contaminants and their properties hsa.ie

Example

Carbon monoxide Carbon dioxide Acetone, ethanol, chloroform, styrene, petrol Asbestos, Glass Solution being sprayed, e.g. paint, steam, electroplating baths Solder or welding fumes Flour dust Concrete/cement dust generated by grinding cutting, crushing, drilling etc. Silica from stone cutting. hsa.ie

Description

Invisible gas at room temperature. Normally a liquid at standard temperature and pressure. Volatile and evaporates into atmosphere. Solid particles with a length-to-diameter ratio. Fibres are only visible in high concentrations. The solution droplets are larger than a vapour – liquid particles. Solid that has been vaporised and condensed (very fine

Flammable contaminants:

Where flammable or combustible materials are being extracted, given the right conditions there is always a risk of fire or explosion. A fire or explosion within ducting can propagate the length of the ducting and quickly spread fire to other areas, depending on the amount of ducting and whether the necessary conditions for fire are present. For a

Corrosives:

Occupational Hygiene Society of Ireland (OHSI) www.ohsi.ie hsa.ie Occupational Hygiene Society of Ireland (OHSI) www.ohsi.ie hsa.ie Occupational Hygiene Society of Ireland (OHSI) www.ohsi.ie hsa.ie Occupational Hygiene Society of Ireland (OHSI) www.ohsi.ie hsa.ie Occupational Hygiene Society of Ireland (OHSI) www.ohsi.ie hsa.ie Occupational Hygiene Society of Ireland (OHSI) www.ohsi.ie hsa.ie Occupational Hygiene Society of Ireland (OHSI) www.ohsi.ie hsa.ie Occupational Hygiene Society of Ireland (OHSI) www.ohsi.ie hsa.ie Occupational Hygiene Society of Ireland (OHSI) www.ohsi.ie hsa.ie Occupational Hygiene Society of Ireland (OHSI) www.ohsi.ie hsa.ie Occupational Hygiene Society of Ireland (OHSI) www.ohsi.ie hsa.ie Occupational Hygiene Society of Ireland (OHSI) www.ohsi.ie hsa.ie Occupational Hygiene Society of Ireland (OHSI) www.ohsi.ie hsa.ie Occupational Hygiene Society of Ireland (OHSI) www.ohsi.ie hsa.ie Occupational Hygiene Society of Ireland (OHSI) www.ohsi.ie hsa.ie Occupational Hygiene Society of Ireland (OHSI) www.ohsi.ie hsa.ie Occupational Hygiene Society of Ireland (OHSI) www.ohsi.ie hsa.ie Occupational Hygiene Society of Ireland (OHSI) www.ohsi.ie hsa.ie Occupational Hygiene Society of Ireland (OHSI) www.ohsi.ie hsa.ie Occupational Hygiene Society of Ireland (OHSI) www.ohsi.ie hsa.ie Occupational Hygiene Society of Ireland (OHSI) www.ohsi.ie hsa.ie Occupational Hygiene Society of Ireland (OHSI) www.ohsi.ie hsa.ie Occupational Hygiene Society of Ireland (OHSI) www.ohsi.ie hsa.ie Occupational Hygiene Society of Ireland (OHSI) www.ohsi.ie hsa.ie Occupational Hygiene Society of Ireland (OHSI) www.ohsi.ie hsa.ie Occupational Hygiene Society of Ireland (OHSI) www.ohsi.ie hsa.ie Occupational Hygiene Society of Ireland (OHSI) www.ohsi.ie hsa.ie Occupational Hygiene Society of Ireland (OHSI) www.ohsi.ie hsa.ie Occupational Hygiene Society of Ireland (OHSI) www.ohsi.ie hsa.ie

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What does leviable mean?

leviable. ( ?l?v??b?l) adj. 1. (Economics) (of taxes, tariffs, etc) liable to be levied. 2. (Economics) (of goods, etc) liable to bear a levy; taxable. Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014.

What is the plural of Lev?

lev (plural leva or levs) The currency of Bulgaria, divided into 100 stotinki; Translations References Anagrams. ELV, vel; Czech Etymology. From Old Czech lev, from Proto-Slavic *l?v ...

What does LEVD mean?

The definition of lewd is offensive sexual behavior. An example of lewd is an old man at a county fair leering at young girls. Wicked. Showing, or intended to excite, lust or sexual desire, esp. in an offensive way; lascivious. Southey. Too lewd to work, and ready for any kind of mischief. Lascivious, sexually promiscuous, rude.

What is Local Exhaust Ventilation (LEV)?

What is local exhaust ventilation (LEV)? Local exhaust ventilation is an extract ventilation system that takes airborne contaminants such as dusts, mists, gases, vapour or fumes out of the workplace air so that they can't be breathed in.

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