Discussion on the replacement of large-scale torch systems
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Please discuss the replacement and treatment of pipelines for new large-scale torch systems!
I really want to learn about this area!
Before the flare is put into use for venting air, it is necessary to ensure that all equipment and pipelines through which waste gas is discharged to the flare have been properly purged.
Previously, we carried out the replacement in this way: we started by using steam, with the various vents and drain valves kept slightly open, all the way to the flare separator tank; gas was detected at each point. Once a large amount of gas was observed at the end points, those drain and vent valves were closed, and nitrogen was injected into the flare system until the pressure reached between 50 KP and 100 KP. At that point, the drainage valves at the lowest points could be slightly opened to allow nitrogen to flow out, and a sample was taken for analysis; an oxygen content of 0.5% was sufficient. . . .
The key issue is that when the production system is switched over, the actual production system itself is replaced; and when the startup system is replaced, air may be released into the flare system. Could this pose a risk of flare roaring or explosion?
Long-term replacement is carried out before operation.
Hehe, the pipes of large chemical industry flares are usually very thick and long; I’ve heard that when welding them, it’s important to use TIG welding for the root pass.
Question: Is a oxygen content of 0.5% the standard? Is it empirical data?
This is the standard for pipeline replacement in petrochemical plants
The pipelines are purged with nitrogen before driving
The main torch pipe and branch pipes have been purged successfully, with an oxygen content of less than 1%. These are the oxygen parameters for the torch system in use here.