How to clean system equipment and pipelines after maintenance

Large equipment pipes are generally first cleaned manually to remove debris left over from maintenance, followed by cleaning with air, and then washed with water. If necessary, alkali cleaning can be used for degreasing, after which acid cleaning is used for rust removal

It is best to seal all the openings that have been removed during maintenance, as well as the openings inside the equipment. After the maintenance is complete, use a paste to remove the impurities from inside the equipment.

The equipment pipelines are generally purged with compressed air after a major maintenance session; a vacuum cleaner can be used inside the equipment, and finally, it is sufficient to clean them thoroughly with a soft dough.

Our approach: During the maintenance of large equipment, cotton yarn is first tied to wire to block the outlet of the feed pipe; after the maintenance is completed, it is cleaned manually. Small solder slag is removed with dough. When cleaning the slag from the pipeline, the lowest point drain or flange can be removed for cleaning. If the system lacks a purge gas source, the equipment manhole can be removed and fire water can be used for flushing.

For large equipment pipes, manual cleaning is usually performed first to remove debris left over from maintenance work; afterwards, they are blown clean with air, and then washed with water. If there is oil, scale, or rust present, alkali cleaning can be used for degreasing, followed by acid cleaning to remove scale and rust. Finally, passivation is essential! ! Pay attention to the following issues: 1. Clear all debris left over from the maintenance work! 2. When flushing with water, the heat exchange equipment must be isolated first to prevent foreign objects from entering and causing blockages! 3. After washing with water, make sure to drain it completely. 4. Alkaline cleaning must be carried out before acid cleaning; otherwise, it will severely affect the subsequent acid cleaning and passivation processes. 5 Be sure to determine the material composition of the system before pickling! ! Special attention should be paid to stainless steel and galvanized materials! 6. Be aware of the hazards of hydrogen embrittlement and stress corrosion during the cleaning process! Special attention must be paid to pressure equipment! 7. The passivation process cannot be omitted! And there must be enough time! The pH value must be strictly controlled! You can send me a message to discuss the details in more depth. This post was last edited by Fan Zhou Wu Hu on 2009-4-17 02:08.]