I have a question: for aviation kerosene pipelines, besides nitrogen, what else is needed for purging?
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There is only nitrogen in cylinders at the construction site； Can I rinse it with water and then purge it with nitrogen?
What exactly are the standards that need to be met in this process? That is what needs to be considered. First, it is necessary to understand how the pipeline medium reacts with oxygen in the air and whether there is any danger. Then there is the risk of water mixing with the residual substances in the original pipes. Is it allowed to use the pipeline after water remains in it? These issues must be taken into consideration. Then, for pipes containing such flammable substances, it is necessary to ensure safe displacement; therefore, dry inert gas, nitrogen, is used for the displacement and drying process. If water is used, nitrogen is still required for drying the pipes. Finally, it is recommended that, if the amount of replacement is not very large, consider using liquid nitrogen vaporization for the replacement. All current gas supply stations are equipped with such service facilities. For reference.
1. After washing, the moisture must be removed; water entering the oil can affect its quality. Therefore, it is necessary to dry them; consider moving the pipelines to a safe area and using hot nitrogen for drying, or other methods (direct heating with fire is not allowed). 2. Considering the material of the pipelines, if they are made of austenitic stainless steel, attention should be paid to the chlorine content in the cleaning water. If they are made of carbon steel, they should be dried promptly after washing to prevent rusting. 3. After nitrogen purging, check whether the seal is tight and whether the oxygen content meets the standards. 4. If the oil contains substances that can react with nitrogen, it is necessary to consider replacing it with another inert gas, such as argon.
After flushing the jet fuel pipeline with water, it just freezes again when blown dry with factory air – isn’t it ridiculous to fill cylinders with nitrogen? Moreover, the purging work is mainly carried out by the production unit, with the installation unit providing support.
The wise reflect the actual situation!
I agree with Teacher Ming, the wise one.