Calculation of the wetted area according to API521
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In API521, it is stated that to determine vapor generation, it is necessary to consider only those parts of the vessel that are wetted by the internal liquid and that are 7.6 m (25 ft) or less above the source of flame. There is a question here: for example, what if the source of flame is at ground level? The equipment is located on a platform 5 meters high. So, does the wetted area refer to the area from the ground up to 5 meters, or rather to the area up to the liquid surface at 7.6 meters? The second question concerns the pipes and equipment associated with it: are there any distance restrictions, such as a certain radius around the equipment, or do all the pipes and equipment connected to it fall under these restrictions?
The wetted area refers to the portion of the internal liquid surface from the ground up to 7.6 meters; 460 m2 in area
I mean, the device is on a 5-meter platform; the flame can’t reach that platform, so how can it reach 7.6 meters? That’s my question
Could someone who understands this answer it? Thank you!