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Thanks guys. We are still selecting a model, but probably ECE or Norsok. But either way, I can use Henry's law and the amount of CO2 in the water phase while in the separator. Then the water is drained off, and I assume this concentration of CO2 will not change? Thanks again guys

Hi Guys I think this is straight forward but wanted a second opinion. In a three phase separator, the inlet is a mixture with a specific pCO2. Regarding the water outlet line, the water obviously contains CO2 and is corrosive. For the purposes of modeling, is the pCO2 the same as the inlet...

Hi all, A technical question for applying RBI 581 to a vessel, such as a separator, for calculating the CO2 damage factor. Part of the damage factor calculation requires the Reynold's number so the friction factor can be calculated. This is easy to calculate for a pipe, but how does one go for...

Hi Dhurjati Sen, no I was on a business trip and don't check the forum daily. And even though I specialize in fractography and my PhD was in CO2 corrosion, which won the top prize from the German Society for Corrosion Prevention for outstanding scientific research, yes I could still follow his...

cap1a79, sorry for the delay I was on a business trip. Thanks a lot for these tips and the link to the text, very interesting, I did not know temperature could affect the polarity to this extent. I guess there are some different corrosion product layers that are affecting the corrosion...

Hi Lee - thanks for the reply. It is below 60 degrees, probably closer to 25 C. Yes the corroded area is the carbon steel holder that holds the zinc anode and connects it to the carbon steel oil tank shell (which is coated). Thanks

Hi experts - CP is not really my area, however we have noticed a problem with our zinc anodes in an oil storage tank. The holder that hold the zinc anodes are corroding, which we cannot explain. The zinc would have the lowest corrosion potential so should protect the carbon steel holders, right...

Unfortunately analysis of the black oily residue was not possible. The tubes looked pretty scale free, though.

It's on the water side, is black, oily, and you can smear it around...

One question: Has anyone experienced on the water side, a black oily substance? It was not on the pipes, but it was all over the shell. I have seen this in other old heat exchangers as well.

Just an update for whoever is interested. Seems the second leak was simply a leaking plug. Had a thorough look at the outlet pipe (from the inside), nice running condensation gouges, so yes the outlet gas was condensing. Also looked though the man hole at the water side of the tubes, they seem...

Let me just clarify the pH. The water leaked in, and this water was measured at 4.5 to 6.45 with a chloride concentration of 0.7 mg/L. The boiler water is about pH 10. I will now be examining the tubes in the lab.

Thanks Gentleman for the comments. We will be opening it next week, as some water has again accumulated, so there are new leaks from the tubes... They have a water sample form inside the tubes (process gas side), pH was 4.5. Does anyone know any specific species to test for that may give hints...

Thanks all for your input. NBrink - was the pitting on the water side for SS tubes? This is all carbon. That been said, there are some chlorides in the boiler water, I am told. I am diagnosing this remotely...

Damage to the sensor was also our first guess, however, there was nothing wrong with the instrumentation... We were considering that a small leak would have let water into the process stream, making the air saturated. The gas outlet pipe diameter is 16", vertical, and not insulated. We...

Thanks George - To add to the timeline, they were doing a start up, and couldn't get the outlet temp over 70 C, and ran like this for a month. They did not purge with N2 during start up. I am more of a metallurgist than a chemist, however, during the start up they progressively warm up the unit...

btrueblood this was also our first guess, however, there was nothing wrong with the instrumentation... We were considering that a small leak would have let water into the process stream, making the air saturated. The gas outlet pipe diameter is 16", vertical, and not insulated. We theorized...

G'day guys We have a tube heat exchanger which cools process gas from the Claus sulfur recovery unit (inlet 340 deg C) to about 140 deg C (outlet). The process gas contains H2S, CO2. The waste heat is used to generate steam. The boiler feed water is 100 C, steam leaves at about 140 C. We...

G'day guys We have a tube heat exchanger which cools process gas from the Claus sulfur recovery unit (inlet 340 deg C) to about 140 deg C (outlet). The process gas contains H2S, CO2. The waste heat is used to generate steam. The boiler feed water is 100 C, steam leaves at about 140 C. We...

What chloride content are you exposed to? From experience 316Ti in 13,000ppm chloride and no oxygen there was no problem with pitting. The addition of oxygen to the system caused several pitting failures at welds. Pickling the weld with 6% HF solved this problem. Rob Muggleton Corrosion, Oil & Gas