June 2006

Special Report: Process/Plant Optimization

Accurately predict radiation from flare stacks

Using this technique can take the guess work out of design calculations and improve costs

Baukal, C., John Zink Co. LLC; Hong, W., Institute of Process Equipment; White, J., Smith & Burgess LLC

Elevated flares are commonly used in the hydrocarbon processing industry. They are typically designed to handle a wide range of flowrates from purge to very large emergency release rates. Flare stack height has to be properly designed to address safety considerations such as thermal radiation and flue gas dispersion. In many cases, thermal radiation forms the basis for determining flare stack height and location, as well as sizing the limited-access area surrounding the flare. Overestimating flare radiation (FR) results in a taller-than-required stack and increased costs. Underestimating FR results in a shorter-than-required stack, which exposes personnel and equipment to potentially dangero

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