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Damage mechanism of CI Piping used for Ammonia and CO2 service

Damage mechanism of CI Piping used for Ammonia and CO2 service

Damage mechanism of CI Piping used for Ammonia and CO2 service

(OP)
Hello everyone,

We are using CI piping for fluid service containing NH3,CO2,H20 and H2S. The fluid composition is as follows:
NH3 = 0.402 kg/m3
CO2 = 0.255 kg/m3
H2O = 0.128 kg/m3
H2S = 0.0003 kg/m3
Temperature = 60-80Celcius
Pressure (psi) 14.7

The CI piping is suffering from thickness loss, pitting and pinholes. The corrosion of loss is not uniform and it is mostly localized. What could be the most possible material to shift too?

Thank you.

RE: Damage mechanism of CI Piping used for Ammonia and CO2 service

Do not double post on ENG-TIPS !!!!

MJCronin
Sr. Process Engineer

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