Material selection for Melt Plastic contaminated with Chloride and Bromide

[Mohsen_81]

Hello All,

For one of our projects, we need to select proper material for a pipe containing melt plastic contaminated with Bromide and Chloride. Following is the operating condition:


[li]Design pressure: 50 bar[/li]
[li]Design Temperature: 420 °C[/li]
[li]The contamination of bromide and chloride is not clear yet.[/li]

The client asks for using glass-lined steel to prevent corrosion, but pipes with this material are not available for the above design condition. My search shows SS316 is not applicable for use in wet Bromide and Chloride contamination. There are two questions:

1- A wet environment shall include water or melt plastic is an example of a wet environment?
2- If we consider it wet or dry, do you have any experience with material selection for this application?

Thank you.

 

[Jessica Walliams]

The plastics material selector will help you find the right polymer to suit your requirements. The material selector will show you the full range of plastics available, or the filter options on the left can be used to narrow the choice down to plastics consistent with the selected attributes.

 

[EdStainless]

You need more info about the plastic that they want to handle. Is it a chlorinated material (like PVC) or are Cl compounds added? The Br is likely there as a fire retardant, verify that.
At 420C why would there be any water?
Are there any abrasive fillers in the plastic (minerals or glass)?
I have seen this done with various high alloy SS grades (6%Mo) and some high Mo Ni alloys.


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P.E. Metallurgy, consulting work welcomed