Catalytically absorb and stabilize the steam used for shutdown purging, and ensure that the temperature does not become too high
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When the catalytic absorption stabilization system is shut down, steam is routed from the vapor tower to the flare system; the temperature should not be too high, and the flow rate of steam should not be too large. What are the problems if the temperature of the torch system is too high? How much higher generally is it not allowed to be?
This is mainly limited by the performance of the gas holder’s sealing; the temperature inside the gas holder must not exceed 50 degrees. There is also a limit on the total amount of gas in the intake tank; the greater the amount, the higher the temperature at which a single stream of gas can be released. We often say that it should not exceed 70 degrees, or 90 degrees, but ultimately it is limited by the temperature inside the gas tank.
For high temperatures, the main consideration is whether the flare pipeline system can withstand it; when extinguishing the flare, the amount of steam used for blowing must be controlled.
The flare pipeline network, which includes the entire flare system, can withstand very high temperatures; there are no restrictions on this in the specifications. It’s possible that you are considering material issues, which is why a temperature limit has been set
The limit temperature we consider is 80°C, with a maximum of no more than 90°C. The design temperatures of the flare tank and flare line are primarily considered.
This value should have been determined during the initial design of the torch. However, considering the variations in the allowable stress of the materials, if Q345R is used as the material, temperature fluctuations within the range of 0 to 150 degrees should not theoretically affect the safe operation of the torch tubes and pipelines. In the case of Q245R, there are still variations in the allowable stress, so calculations are necessary