Gas system purging completed
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For purging the gas system, what medium do everyone use? I’ve seen some systems that use steam, but the standard specifications state that steam should not be used for pipelines carrying low-temperature media. I would like to ask everyone what medium they use, and what are the consequences of violating the regulations
Steam is generally used for this purpose. You can use nitrogen as well, but the cost might not be low; moreover, the advantage of steam is that it allows the equipment to undergo thermal expansion and contraction, enabling inspection of the equipment while performing purging.
Considering thermal expansion and displacement of pipelines, it is recommended to use nitrogen for purging the gas system; if steam must be used, consult the design institute in advance, as they may provide relevant suggestions. Generally, purging with steam is not recommended.
First, let’s clarify this issue: since the gas system has been purged and made leak-free, does it belong to the category of pipelines carrying low-temperature media? How to define a “low-temperature medium pipeline”? “\"The gas system has been purged and made leak-free\" – is this what is meant by \"gas pipeline replacement\"? For ordinary gas pipelines at normal temperatures, steam is generally used as the purge gas. For pipelines involved in low-temperature liquefaction of liquefied natural gas, dry nitrogen is used as the gas for purging. Because the entire system needs to remain dry. Prevent retained moisture from freezing and disrupting the operation of the imaging equipment.
This is not written quite standardly; the term used in standards is non-thermal pipeline. By gas system, I mean the fuel gas used here, in the furnaces
The answer given on the 3rd floor is exactly what I wanted to ask. Are there any obvious signs of damage or deformation? Are there any things to be careful about during purging?