Material selection under chlorine water treatment conditions
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Now there is a water treatment project, the chlorine content of raw water is 1200PPM, the pipe diameter is 500, normal temperature and normal pressure, and it is necessary to add an orifice plate and an on-off butterfly valve. We have several arguments: 1. Choose duplex stainless steel 2. Stainless steel 316L. 3. Choose carbon steel with polytetrafluoroethylene lining for the valve seat and valve plate. Please comment on the availability, advantages and disadvantages of each option.
It is best not to use stainless steel 316L because the corrosion of chloride ions is too serious.； Of course, it is good to use dual-phase steel, but the price is too expensive, and the price-performance ratio is not very good for this occasion. ； It is best to choose carbon steel and polytetrafluoroethylene lining for the valve seat and valve plate. Since polytetrafluoroethylene is resistant to corrosion by chloride ions, the temperature in this case is normal temperature. As long as the temperature does not alternate, the polytetrafluoroethylene will not harden and will not cause aging of the plastic. It is also cost-effective. However, you must choose a very professional manufacturer, otherwise the quality cannot be guaranteed and it is easy to cause corrosion, failure and leakage.
Choose PTFE lining for durability.
Titanium material can be used, but it is more expensive and should be more durable.
Haha, if the budget allows, I think titanium is the best choice! The price of titanium materials is not very high now.