The confusion surrounding 7.5-meter fires
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The calculations related to the safety valve standards take into account the heating surface area of containers located at a height of 7.5 meters below a fire source. I have a question: if the container is placed on top of the pump room, isn’t it then unnecessary to consider the risk of fire? (The container is used for gas-liquid separation, and the medium involved is not flammable or explosive; it’s just this one container placed on the roof.) I would appreciate it if the teacher could provide an explanation
If the top of the pump room is a solid platform rather than a grating, then a fire source could also originate on the top of the pump room. That also needs to be measured 7.5m starting from the top of the pump room.
It is considered to be 7.5m above the platform where the container is located; if a pool fire cannot occur, such as on the platform with steel grating mentioned above, then this factor need not be taken into account
You can take a look at the standard API521 for fire calculations