How is the main pipe of a large-scale plant torch system replaced? ? ? ? Should I use steam for purging or nitrogen?
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How is the main pipe of a large-scale plant torch system replaced? ? ? ? Should I use steam for purging or nitrogen?
Nitrogen is a better choice; first, it does not produce condensate water, and second, it is inert and very safe.
There is a major problem with using nitrogen: at the lowest points or bends in the pipeline, liquid condensate accumulates. Using nitrogen to purge these areas is like using wind to blow over the surface of water – no matter how strong the wind, it can only cause surface ripples. Of course, this effect isn’t as extreme in pipelines, but when there is accumulated liquid, it’s difficult to clean it away using nitrogen purge. There is no such problem with steam.
The nitrogen consumption is very high; it’s better to use steam； In winter, be careful to prevent freezing and condensation.
Blow with steam to displace the oil and gas in the pipeline.
Steam is sufficient; there’s no need to use nitrogen. Especially in large torch systems, nitrogen is wasted and difficult to clean up properly
Steam is recommended, but care must be taken to control the system pressure to prevent overpressure
With steam? Does it work? How is condensed water treated?
Using steam for purging torch lines is unsafe; high temperatures cause vaporization and volume expansion, which can lead to cracks in the pipelines. Secondly, steam condensate accumulates at the lower part of the flare line, affecting flare emissions.
We usually use steam for purging, as this ensures a thorough cleaning, and then we replace it with nitrogen
It depends; nitrogen is used in winter, as steam can easily cause water hammer and freezing. Steam is used in summer; nitrogen is expensive. .