The effect of HCL in gas phase on Carbon steel and Stainless steel

[surchotw]

Hi,

There are questions about the corrosion on carbon steel. I use carbon steel pipe A.53 and apply HCL and heat up the pipe with steam tracing 100 degree C.

Question
1. I 'm in doubt that HCL in gas phase is it able to be the cause of corrosion or rust. There is a small steam in the pipe also.

2. The higher temperature is higher corrosion rate or not?

In our assumption is "I heat up the pipe to ensure that there is no H2O in liquid phase inside the pipe, so there is no electrolyte. No corrosion or rust.

Thank you in advance for every answers.

SC.

 

[EdStainless]

corrosion rates are exponential with temp.
If there is a riak of HCl in the vapor phase you would need to be hot enough to assure that no HCl can condense. So some temp above 109C is needed.

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Plymouth Tube

 

[unclesyd]

The HCl has to anhydrous any moisture at all will corrode both materials as stated above. In our service there is no SS equipment that can see HCl. We work directly from the tank car to a vaporizer then gas phase to the process.