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Posted By Shane Johnston
I have heard the figure of "3m" for the minimum height a stack should be above roof level for the discharge of hazardous materials to atmosphere.
I know there are detailed calculations and modelling etc that can be done, but anyone any idea where this specific figure comes from, all I can find is an American Standard (ANSI) on fume cupboards?
Shane Johnston
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Posted By Simon Dobby
The Environment Agency's "Technical Guidance Note DO1 (Dispersion)" details 'Guidelines on Discharge Stack Heights for Polluting Emissions'. The Guidelines do indeed detail calculations for determining stack heights. However, the Guidelines also detail overriding minimum requirements for discharge stack heights and state that "no discharge stack should be less than 3 metres above the ground or any adjacent area to which there is general access, for example roof areas and elevated walkways". There are in addition other overriding minimum requirements (based on factors such as the discharge's distance from other buildings or ventilation inlets) that should be taken into account and the 3 metre requirement may therefore not be so simple.
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Posted By Smurfer
The 3m is to prevent people sticking their heads down the stack to smell the discharge or putting their arms down and losing fingers in fans!!
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Posted By Jim Montgomery I had the same problem at Bathgate, and contacted SEPA for advice. By return they sent me a disc that actually calulated the height for you. Perhaps EPA in England could provide you with similar assistance Regards Jim Montgomery EHS Advisor jim.montgomery@dana.com
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