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thread338-286488 @tag10 (Mechanical)(OP) I am interested to know about the final design of the CO2 export pipeline. As long as the CO2 is in supercritical stage, no water drop out is expected. But, how the start-up and shut down conditions were managed i.e., if the pressure & temperature...

@SJones Thanks for the update. Yes, it is well with in DEP limits. However, it is noted that some of the operators do not intend to use Alloy 825 though the limits are within the boundaries of Table A.14 especially the temperature is >100°C-120°C. Unfortunately, I do not have much...

@SJones CO₂ - 18%mol H₂S - 2%mol Chlorides - 17000ppm Total Organic Acid - 218ppmw Bicarbonates - 44ppm Temperature - 130°C-145°C Pressure - 200barg-226barg

@SJones Thank you for your response. Since I have exhausted in searching for relevant information, the queries have been posted here seeking the member's opinions assuming that they might have come across similar situations. More information will definitely help to make a good judgement...

@SJones Great to see you here. There is a cautionary note in the remark's column of Table A.13, "No limits on individual parameters are set, but some combinations of the values of these parameters might not be acceptable.". Do the temperature (>150degC) in Figure 23 and Figure 24 fall under...

Dear Ed Thank you for your quick response. Fortunately, the referred paper in Figure 23 is available, but I could not understand the basis for the curve in Figure 23. As per my understanding any increase in H2S content (partial pressure) would push the lower limit of Alloy 825 to less than...

thread338-310345 Dear All, I have come across the following paper "Environment-Assisted Cracking of Corrosion-Resistant Alloys in Oil and Gas Production Environments: A Review by P.R. Rhodes" There are two figures in the above papers (attached) Figure 23 and Figure 24 indicating the effect...

@EdStainless Thank you for your quick response. Yes, I don't expect the same performance. I am trying to understand (or relate) 1st and 4th paragraphs of A.13.2. @SJones Great many thanks for your responses which are more helpful in understanding WOL applicability. 1) I think the parameters...

thread338-262770 The remarks column in Table A.13 of ISO 15156-3 permitting to use annealed alloys of Type 4a (Alloy 825) in sour environment without restriction on temperature, ρH2S, chloride concentration and in situ pH. But it is also indicating that no limits on individual parameters are...

Many thanks to all. Personally, my choice will be Alloy 625 gaskets with Alloy 625 WOL in gasket grooves in view of the subsea service. I am trying to look for examples of successful field experience with soft iron gaskets.

well, I think it is due to the H2S content present in the production fluids crude and gas. The FeS layer could be reducing the corrosion rate. The wet crude is having water content during mid to tail end life.

As per Section 9.4.1 of EEMUA 194 is indicating that CP covers the gaskets adequately. Section 9.2.2.2 indicating that crevices formed by bolt and bolt hole are also covered adequately.

understand that, CP will be there by means of sacrificial bracelet anodes. I missed to add it thinking that it is like default condition.[bigsmile]

missed to add that the preliminary corrosion assessment resulted in corrosion rates of ~0.1gmm/year for wet crude, 0mm/year for wet gas and ~0.05mm/year in gas lift lines.

Thank you Little Inch. Yes, CO2 in the range of 4-5 mol% and H2S is in the range of 0.3-0.35.

Dear All Can anyone share information on selection and field experience of soft iron gaskets in subsea pipelines in wet crude/gas, gas lift and treated seawater injection services. Krishnnaa26