How to consider the venting volume in the spherical tank area
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Dear experts, may I ask how the venting volume for the flammable liquid spherical tank area should be determined? Are there any principles or guidelines for this? This has a significant impact on the design of the venting torch
Flammable liquids are rarely stored in spherical tanks; they are generally kept in low-pressure storage tanks. The amount to be vented is calculated by taking the maximum value from several different operating conditions, including those involving external fires, and the calculation is done based on the wetted area
The flammable liquid mentioned by the poster could be liquid hydrocarbons.
It’s mainly liquid hydrocarbons such as liquefied gas
Then the changes in operating conditions can be significant. If the liquid level is extremely high, then the maximum loading condition should be used; in the case of a fire, things get much more complicated, and it is necessary to follow the designs provided by professional engineers.
The requirements regarding this vent volume vary greatly among different design firms; these differences can be several orders of magnitude, which in turn results in significant variations in the size of the flares. It is advisable to consult experienced design firms regarding how to handle spheres of similar scale