Flare line metallurgy

piiengineers · Post by **piiengineers** » 06 Nov 2010, 03:58

We are experiencing severe internal corrosion due to high H2S in the process stream and stagnant condition.The pipe material is API5LGR.B and the size is between 20"-42". As an alternate to combat internal corrosion we are thinking to use internally cladded pipe(CS+SS316L).Anyone has tried the cladded pipe in such application?User feedback is very much appreciated.

with regards,

ben · Post by **ben** » 06 Nov 2010, 05:07

For sour services applications and others where corrosion becomes a serious issue, it is always recommended to use clad / lined pipe conforming to API 5LC or D. API 5LC defines all the requirements for lined pipe whereas API 5LD for clad pipes. Both have CRA (Corrosion Resistance Alloy) protection against corrosion.
I have experienced these pipes in H2S and CO2 service with low pH values.

arcpro · Post by **arcpro** » 08 Nov 2010, 05:49

At our site, two major lines (running length ~ 2 km) connecting plant site to utilities conform to API5LD piping with 316 cladding inside. This line contains wet H2S service. To-date, we haven't found any issue with these piping.

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