What type of pipe should be used when the medium contains chloride ions?
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What type of pipe should be used when the medium contains chloride ions? Can 304 be used?
What is the medium pressure? If it’s low, PVC. 304 is a type of stainless steel, and chloride ions can cause corrosion
Chloride ions are always a threat to austenitic stainless steels, as they can cause pitting, stress corrosion cracking, etc. If the temperature and pressure are low, fiberglass-reinforced plastic linings or pure fiberglass pipes can be considered
The specific specifications weren’t mentioned; generally, 2205 duplex stainless steel can be considered.
Steel-lined PTFE pipes can be used when the pressure and temperature are not high.
It is recommended to use plastic composite pipes with a steel framework, which can withstand pressures of up to 4 MPa, are easy to install, and have a low overall cost.
The best choice is to use titanium pipes. Chloride ions never cause corrosion. The price of titanium pipes is high, but from a long-term economic perspective it is still worthwhile, although the initial investment is high.
The pressure is between 0.1–0.6 MPa, and the temperature is between 160–38°C
160 degrees – such a high temperature means that titanium tubes or double-phase alloy tubes are the only viable options.
It is recommended to use steel-lined PTFE or Monel alloy, which are excellent choices
Titanium tubes are relatively expensive; they are only used when it is absolutely necessary； If the pressure is high, a steel-reinforced PE pipe can be used ； If the pressure is low, a PVC pipe will suffice, and it is also cost-effective.