How to Remove Scale from Seamless Steel Pipes for Fire Fighting?
Date:2022-04-28View:606Tags:Seamless Steel Pipe
I believe seamless steel pipe for fire fighting is not unfamiliar to anyone. Seamless steel pipe for fire fighting is a kind of long steel pipe with hollow cross section and no seam around, and also a kind of steel pipe which is resistant to weak corrosive media such as air, steam, water and chemical corrosive media such as acid, alkali and salt, also called stainless acid resistant steel pipe. It is widely used in petroleum, chemical, medical, food, light industry, mechanical instrumentation and other industrial pipelines and mechanical structural parts. In addition, it is lighter in weight under the same bending and torsional strength, so it is also widely used in the manufacture of mechanical parts and engineering structures. But what about the oxide skin of seamless steel pipe for fire fighting in long-term use? Many people do not have special knowledge of this area and the method of operation, the following is to introduce you to remove the seamless tube oxide skin:.
1. Flushing: seamless steel pipe for firefighting should be flushed away before pickling, so that there is no mud, scale and other impurities in the heat exchanger, which can improve the pickling effect and reduce the acid consumption of pickling.
2. Pickling: the seamless steel pipe filled with acid for firefighting will be immersed in static for 2h, and then continuous dynamic cycle for 3-4h, during which the positive and negative cleaning will be carried out alternately every 0.5h. After pickling, if the acid pH value is greater than 2, the acid can be reused, otherwise it should be diluted, neutralized and drained of acid.
3. Alkaline washing: After the end of pickling, NaOH, Na3PO4 and softened water are used to prepare in a certain proportion, and alkaline washing is carried out by dynamic circulation method to achieve acid-base neutralization so that seamless steel pipes for fire fighting are no longer corroded.
4. Water washing: After alkali washing, rinse repeatedly with clean softened water for 0.5h to rinse the residue inside the seamless steel pipe for fire fighting.
5. Record: During the cleaning process, the time of each step should be strictly recorded to check the cleaning effect.
In the daily use of seamless steel pipe for firefighting, we need to understand how it is maintained. Regular maintenance of the product will ensure the stability of the product for daily use. When the scale problem does occur, we can clean the seamless steel pipe for fire fighting by the above methods.
Linkedin
