Flare stacks stack dimensions

The Seal Drum - A typical flare seal drum for an elevated flare stack is illustrated in Figure 7. A baffle maintains the normal water level, and the vapor inlet is submerged 75 mm to 100 mm. Drum dimensions are designed such that a 3 m slug of water is pressured back into the vertical inlet piping in the event of... 

What are the temperature and composition of off-gases during start-up, normal operation, extreme operating conditions, shut-down, emergency shut-down or malfunctions Is the safe discharge and removal of pollutants from off-gases ensured Are off-gas stacks and flares etc. properly dimensioned ... 

Another method, given in API RP521 uses the drop-out velocity of a liquid particle as the basis for design the residence time is such that the particle will fall to the liquid surface level within the length of the drum. The minimum particle diameter is assumed to be 150 tm, since flare stacks downstream can cope with particles smaller than this. In the API RP521 method, the drum dimensions are first assumed and then calculations show whether or not these are satisfactory. Often this approach can lead to a tedious trial and error solution. 

A program to estimate the height of flare stack, Flarestack.exe, has been developed for simple and Brzustowski and Sommer approaches. One sketch has been added to the main form to understand the dimensions and parameters. The calculation can be performed by using either SI or English units... 

Critical Burner Dimensions - The position of the flameholder s and burner lines relative to the bottom or the stack is critical for efficient operation. For example, the multijet flare has a turndown ratio of 10 1 when the flameholder centerline is 125 mm below the bottom of the stack but only 2 1 when it is 150 mm above the bottom of the stack. 

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