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The Knowledge Base for LEV

FRICTION FACTOR CALCULATION IN EXCEL

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Radigan Engineering have a free to download excel spreadsheet. Taken from their website: When in the course of human events it becomes necessary to calculate the Darcy-Weisbach friction factor… engineer’s often throw up their hands, go back to their old college textbooks, and say “about .02!” [Which normally isn’t off by more than a factor…

P602 Manual Calculation sheet

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Glutton for punishment?  Then you will enjoy our Manual calculation sheet! This is for calculating pressure losses for the P602 course and comes with notes to aid the practice of these calculations.  We all rely on programs to calculate losses for us these days but you have to know this for your exam. Happy practising!…

LEV Glossary of terms

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This is a glossary of basic LEV terms: ACoP –  Approved code of practice. This carries greater legal weight in Great Britain courts than guidance. Aerodynamic diameter – The diameter of a unit-density sphere that has the same settling velocity in air as the particle in question. Air cleaner – A device also known as filtration unit which removes…

Basic Maths for LEV – Fan Laws

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If you have worked through Module 1 – then this one is just a little bit more challenging. This Module looks at the Fan Laws.  these are empirical, in that they are best considered ‘approximations’ to the real world but they do give you a clear picture of what will happen, for example, to the…

Fletchers Nomogram – Chart

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For Captor Hoods – Fletcher’s Nomogram chart for manual calculations of Hood Entry Velocity required to achieve a nominated minimum Captor Velocity at a chosen distance out from the hood (Captor Distance). All units must be in metric Select hood dimensions and calculate Aspect Ration (small dimension divided by large) Mark Aspect Ration on right…