Discussion on whether the low-point nitrogen purge pipeline can be blown clean
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As shown in the picture: The pipeline in the whole plant is about 200 meters long, with a diameter of DN65. Can the liquid be blown clean at this location? This pipeline may carry 3 kinds of materials, so it needs to be blown clean.
“The inspection standard of "Blow clean" should be based on the analysis of nitrogen purity and the allowable content of other material contents. Your "cleaning" should actually be called "replacement". Replacement standard inspection should be supported by relevant analytical methods and analytical instruments. Take samples and analyze them at the replacement outlet until they are qualified. If there is a liquid medium in the tube, can it be blown with 0.6Mpa? According to the elevation of the liquid column, it is ok. If it is a replacement between three materials, the process is still relatively vague. Because the flow direction of the replaced nitrogen is unclear, it needs to be stated clearly. For reference.
If the three materials are frequently switched, it will be too difficult to drain them. In actual operation, the nitrogen will short-circuit and there will definitely be residue. If you don’t switch frequently, you can add condensation at a low temperature after steam purging.
It is easy to accumulate fluid at an altitude of 0.5m