Material selection for hot water pipes with high chloride ion content
Thread Content
The medium is geothermal water, with a chloride ion concentration of 11,000 mg/L; it is also rich in other ions. The design pressure is 1.0 MPA, the design temperature is 75°C, the pipe diameter is DN200, and it will be used indoors. What material would be suitable for such pipes? It maintains cleanliness inside the pipes, ensuring a service life of over 15 years
I’ve seen a material selection table; for values above 300 ppm, Ti material is used at 60°C, 80°C, 120°C, and 130°C
When chloride ions are present in high concentrations, the temperature is high but the pressure is not high, PE pipes can be used; those with a thicker wall thickness can handle a pressure of 1 MPa without any problem. In addition to titanium pipes, metal pipes made of duplex steel such as 2205 or 2507 can also be chosen
Carbon steel pipe + polyaniline anti-corrosion coating; the chloride content in our product is 240,000 ppm
Considering composite pipes, plain carbon steel pipes and stainless steel are not resistant to chlorine, while PE and UPVC face issues at temperatures of 75 degrees