Material issues with some pipes in the secondary brine system
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In the production of ion-exchange membrane caustic soda, it is better to use steel lined with rubber or plastic for some of the pipes carrying secondary brine – please advise.
I’m not sure which type of plastic you mean? Regardless of the type of plastic, I think steel lined with rubber is better. Plastic pipes have lower strength, so it’s difficult to create supports for them; this is especially true in areas such as filters and resin towers where there are many valves and heavy loads. Plastic pipelines certainly cannot withstand the weight of these valves, and may bend or even break as a result.
Steel lined with rubber (low calcium and magnesium content) is a commonly used material. Since the temperature of the medium is around 90°C, ordinary plastics are likely not suitable, unless it’s CPVC or PVDF – though these materials are also quite expensive
It is fine to use it for corrosion resistance purposes, but when considering pipe supports and damage caused by external forces, an inner lining for the steel pipe needs to be taken into account.