Purge media and temperature issues
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As a pipeline with a design pressure of 1.3MPa and a design temperature of 80 degrees, can it be purged with steam? If steam purging can be used, at what level should the purging pressure and purging temperature be controlled? Will the pipeline supports and hangers be damaged if the purging temperature exceeds 80 degrees? Experts please give me some advice!
Steam purging cannot be used on pipelines with a design pressure of 1.3MPa and a design temperature of 80 degrees! During the purging process, the temperature of the steam will inevitably exceed the design temperature of the pipeline, which will cause a series of damage to the pipeline itself, pipeline supports and hangers, etc., which is not conducive to the safety of the pipeline. In this case, compressed air purging can be used. For specific requirements, please refer to GB50235, Section 8.3.
Yes, what you said on the second floor makes sense. You can also use nitrogen to purge.
The following article in this forum may be helpful to you: Steam pipeline purging solution http://bbs.hcbbs.com/thread-50266-1-1.html
Definitely not. The minimum temperature of steam is over 100 degrees, which exceeds the design temperature of the pipeline. It will have an impact on elbows, flanges, gaskets and other equipment. The pipeline supports and hangers will definitely cause stress concentration, causing safety hazards.