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Hello Thomas, thank you very much for the Additional References, and NACE 07195 in particular. Regards, Demser

DS and IM: In the meantime, I learned about the publication of C.P. Dillon in "Materials Performance" (Dec 1999, p.74f), who mentions several applications - besides Urea - where carbamates are discussed as corrosive agents: alkylamine production, NH3 stripping (alkanolamine, ethyleneamine...

IM, carbamate occur as first reaction product in processes dealing with CO2, NH3 and water, including carbon capture by NH3. I don't know about ARUs Demser

Ironic metallurgist, thanks a lot.

Dear all, carbamate is known as corrosive agent in urea plants, where high pressure and temperature are applied. But what about mixtures of CO2,NH3, water at moderate temperatures (10 - 80°C) and moderate pressure (1 - 10 bara)? I am asking because when quering for 'carbamate corrosion' or...

Hi XLl83NL, thank you for feedback. My office is in the EU but design is - in this case - according to ASME. This was a more general question, referring to piping and equipment. Also ASME BPVC allows this reduction in temperature if the stress is reduced.

Hi, asme b31.3 fig. 323.2.2B allows application of low-T carbon steel below -48°C if the requirements on Stress Ratio are met. But how is this "translated" into the documents, e.g. pipe class, or for ordering, or for documentation to a Notified Body? In other words: How / where to fix it in...

Hi Community, for a project on flue gas cooling below the acid dew point, several materials are discussed, among them S-TEN1 and S-TEN2 steel. These are - per composition - weathering steels. According to manufacturers information, the performance in sulfuric acid over a wide concentration...

Hello Steve thank you very much for the quick feedback [dazed] Regards, Reinhard

Dear all with the new combined standard NACE MR0175 / ISO 15156-2002, several changes had been introduced (with respect to previous MR 0175 versions), still present in the most recent version of 2015. HIC (Hydrogen Induced Cracking) is among the new features, and described in Clause 8 of ISO...

Yes, that is the is exactly the problem. An UNS S31803 device has been ordered though super duplex should be applied - I fully agree to you. "Troubleshooting: install 1803 and replace by superduplex when available" At 10°C, CCT is not far...

for a valve of a seawater piping system. Seawater is applied for cooling.

SJones, thank you for your advice. I was looking for 22Cr duplex to be applied at 10°C. General corrosion seems not to be an issue at this temp., whereas CPT is about 30°C and CCT less than 20°C. So, 22Cr should be applicable. Regards!

Hi community my first time in eng-tips. I am looking for reliable tables on corrosion of duplex in seawater (if there are any). Can anybody help me? Thank you