Medium: hydrogen chloride, highly hazardous; lining: PTFE. Can Q235B steel be used?
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Medium: hydrogen chloride, highly hazardous; lining: PTFE. Can Q235B steel be used?
Although Q235B provides a better effect with non-metallic phase contrast, it cannot be used; compatibility between the medium and the material (substrate) must still be considered. Appendix GB150.1 explicitly states that Q235B cannot be used in media with extremely high hazard levels.
Appendix D of GB150.2 explicitly stipulates that Q235B steel plates shall not be used for media with an extremely high or high level of toxicity
No, the lining is only for corrosion protection. Design, manufacturing, inspection, and acceptance shall all be in accordance with GB/T150.
It’s not possible. The Ptfe lining only provides corrosion resistance; it offers little protection against chlorine corrosion, and over time the pipeline gets corroded. As a result, the carbon steel pipeline is also corroded. And it is also highly hazardous.
No, although the material is not separated from the steel.
However, we believe that according to current regulatory standards, hydrogen chloride is of moderate hazard. It is not highly hazardous.
For moderate hazard levels, Q235B steel can be used.
It is best to use Q345R material. Owner, could you explain the process for PTFE lining?
I’m really not sure about this; we just design the drawings and then go straight to the manufacturing factory to have them produced. What the process package supplier proposed is Q235B lined with PTFE
According to Appendix D of GB/T150.2, Q235B steel plates shall not be used for media with an extremely high or high degree of toxicity; therefore, they cannot be utilized