Regarding the prohibition of using steam for purging non-thermodynamic pipelines
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Dear Haichuan netizens, according to GB50235, steam cleaning is applicable to steam pipelines; it shall not be used for non-thermal pipelines. However, in actual design and construction, many process pipelines (non-thermal pipelines) are purged with steam. Why is that?
Expansion joints must be installed in steam pipes to safely absorb the amount of expansion that occurs during steam purging. Non-thermal pipelines generally do not have expansion joints, so they cannot be purged with steam. In reality, steam is used for purging because the pipes are not long, there are elbows, no fixed supports, and the purging time is short
Is it okay not to follow the specifications during the design and construction process?
This is probably related to the medium you use for purging; for example, some substances tend to adhere to the container, and using alternating steam heating and cooling helps to remove them more easily. . . . .