Pipeline valve selection
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235 seamless tubes are used for the circulating water pipes in water film dust removal systems; previously these tubes would scale up, but lately there is no scaling anymore. Instead, corrosion and wear have increased, leading to perforations – even ordinary gate valves get punctured. What effective solutions are there? The water has a high salt content, with a pH of 4-5; it contains sulfur, and there are many fine particles due to poor sedimentation in the circulation tank! Are there pipes with excellent wear and corrosion resistance? How to use glass-lined pipes (fear of vibration)? Which valve is the best choice?
What is the pressure level? Piping lined with rubber, as well as rubber-lined butterfly valves, could be considered
Since lined pipes are not wear-resistant, it is better to use stainless steel pipes.
For valves, I think using rubber lining is sufficient; the material should be chosen based on the salt content of the medium.
This post was last edited by Gunaobiao Kun on 2011-10-13 at 10:25. It is recommended to use stainless steel; replace both the pipes and fittings. In areas with poor water quality, corrosion occurs quite severely, especially when condensate water undergoes secondary vaporization.
Reply to 2# arita: Pressure 0.4-0.5MPA
How about using FRPP pipes? The water temperature is around 50 degrees. FRPP is corrosion-resistant, but I’m not sure about its wear resistance!
Generally speaking, useful carbon steel is used for circulating water. You don’t remove the particles by adding chemicals. It’s a weak acid; NBR should suffice, right?