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The Knowledge Base for LEV

HSE RR900 “Visualisation & Control of Solder Fume Exposure”

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The full title of this HSE research Report is in fact “Visualisation & Control of Solder Fume Exposure – a Quantitative Assessment of LEV Effectiveness”. Published in 2011 by HSE, the document was prepared by HSL. From the introduction to the Research Report:- “Colophony or Rosin Based Solder Flux Fume is a known cause of…

Measuring Aerosols in Air

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Occasionally there may be a need to measure aerosol particulates in air and there are instruments to do this ….. but they work on two fundamentally different ways.  This article by TSI guides you through the differences and might assist you to select the best option for your application. The article provides a basic understanding…

CLEAPSS Guide G9 – Fume Cupboards in Schools

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Building Bulletin 88 (Fume Cupboards in Schools) has been replaced by a new document G9 Fume Cupboards in schools, published by CLEAPSS. This updated version has new information regarding LEV testing and the replacement of filters. Regarding LEV testing it specifies: • carrying out additional face velocity tests with the sash at 200mm to ensure…

Dust Removal Filters for Combustible Dusts

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Very useful guide, clearly set out and with simple but effective diagrams from the Filtration Group. This information sheet looks at ATEX compliant filters for removing dusts. Click on the URL link below to be able to download a pdf copy:-

P601/P604 LEV Report template

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So you’ve passed the P601 or P604 exam, congratulations! The next step is to submit two LEV Thorough Examination and Test Reports. It can be difficult to know where to begin when it comes to submitting two LEV Thorough Examination and Test.   This template has been developed over the years with experience of mentoring Oxyl8…

Video – “How to Measure Captor Hood Control Distance?”

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Latest OXYL8 LEV training video (Sept 17) on YouTube discusses the ways in which we can approach the verification of the Control Distance of a particular Captor Hood. More usually we use smoke release on the centreline out from the hood face until the first ‘whisp’ of smoke is not controlled.  From there most surveyors…

Video – “Captor Hoods – Basic Principles and Design Theory/Equations”

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Latest OXYL8 LEV training video (Aug 17) on YouTube which provides an introduction to the basic operational principles of Captor Hoods and an outline of the mathematical theory for Captors. Fletchers Nomogram equations are discussed and reference made to an OXYL8 (free to download) Excel spreadsheet which will do all the hard number crunching for…