Why must the flare gas main meet the Step-by-Step Low requirements?
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This post was last edited by hutom123 on 2009-11-16 at 13:41. Why must the flare gas main meet the Step by step lower requirements? That is, the safety valve must be above the discharge branch pipe, the discharge branch pipe must be above the discharge main pipe, and the discharge main pipe must be above the flare pressure relief tank. Thank you!
It is necessary to prevent the accumulation of liquid within the flare line, as this can cause blockages in it. In emergency situations when it is necessary to relieve pressure from the system, a blockage in the flare line can have serious consequences. Additionally, fluid accumulation in the torch line can cause fluid hammer in the pipeline, leading to severe vibration of the pipeline.
Generally, in a torch line, if there is a low point, a separation tank is added to separate the accumulated liquid.
The gas medium in the torch gas pipeline tends to partially condense; the Step-by-Step Low system prevents the accumulation of liquid within the pipeline. It helps avoid blockages caused by such liquid accumulation during low temperatures in winter, thus preventing accidents
Since condensate is generated within the torch line, a lower elevation helps with the removal of this condensate. The high elevation of the safety valve’s discharge pipe is intended to prevent liquid from entering the safety valve, thereby avoiding any impact on its performance.
The principle is simply that there is no liquid accumulation inside the pipeline, with the flame tube always angled toward the liquid separation tank
In actual pipeline installations, many low points are inevitably present, which requires proper heating and drainage at these points.
Accumulation of liquid within the flare line undermines the safety of the production process; in the event of an accident, the consequences can be severe. Additionally, considering the backpressure issue related to safety valves, it is necessary to install them at a height higher than that of the flare line
Are there any regulatory requirements? What does that regulation say? It’s still the *usual practice
I’ve never been able to figure out this: the setting of safety valves must adhere to the principle of gradually decreasing pressure, and at the same time they need to be placed as close as possible to the equipment that needs protection. In a situation where the equipment under protection is on the ground while the flare header is located in a pipe rack, how should the position of the safety valves be determined?