I got a question from the field regarding the possible corrosion due to the Warm Lime Softener (WLS) operation upset. They said because of the over injection of lime slurry into WLS and the water sample taken from the tank shows higher lime concentration and pH value than the acceptance level...
Thanks for all the answers. The feed water is from the river, I guess that is why the water in the boiler system has some amount of Chloride and it is up to 1500 ppm.
Hi, I have a question about the allowable level of chloride in boiler feed water. The water has been treated to very low oxygen level (about 6 ppb) and the PH is 12. In my option, there is no concern about the chloride because of no corrosion agents either from oxygen or low PH. Just confirm if...
Hi, this may be a old topic. But I met a situation that the original pipe inside a overflow tank was CS + coating. It is produced water service with 0xyen ~ 1ppm and chloride ~270 ppm. pH is about 8. Op. Temperature is ~80C. Now the field consider to choose SS to replace the old CS+coating pipe...
Hi, I have a question regarding the hydrotest water. Is there any codes or practice we can follow in terms of the water used for hydrotest? How to prevent the potential corrosion issue? Thanks.
Hi, recently we got reported corrosion issues under the process piping (flow code0 from both on shore and off shore facilities. The labels are the plastic wraps. The metal loss can be up to 2 mm for the 8 mm wall thickness. Do you have any experiences about this. How to prevent?
Hi, we met an issue that, a new valve with cast body made of A351 CG8M (317SS)is installed on the carbon steel piping. The product in the piping is deaerated river water which means the low oxygen. Do I need a isolation kit for the SS to carbon for this case?
Hi, we have a produced water injection line into a desanding vessel. Outside the vessel, there are two control valves for the injection line. After a year, there are some pitting and general corrosion occurred downstream of the valves and in the valves. Based on our analysis, we think the...
Hi, I met a problem on WPS regarding filler materials. According to WPS we have, ERNICRMo-10 is specified (Section II, Part C SFA-5.14). The vendor is using ERNICRMo-3 instead because both of them have the same F number. So, they believe the two filler materials can be interchangable. Is that...
Interesting topic. I just am not clear about one thing. It was said galvanized parts should be avoid. But the zinc-related liquid-metal embrittlment usually happen at high temperature service or welding. If the bolt is galvanized and used for the pump with offshore installation, is there...
I have a question regarding the metallurgy for SRB corrosion protection. It was extensively reported that SRB corrosion can eat stainless steel and casue localized corrsoion, like 304L. I am wondering if duplex SS has the same problem in SRB enviroment? Since it is harder than austenite alloys...
Little Inch:
I understand that the produced water line can be also corrosive from the separator with high CO2. However, there is level control valve (piping break) for the water line. For the front part of the line which is connecting to separator, we think the CO2 corrosion should be evaluated...
In our material selection diagram, the material construction for the separator vessel is specified to 316 stainless steel due to the high partial pressure of CO2. For the separated water line at the bottom of vessel, we specify carbon steel. Now, the problem is that carbon steel and stainless...
Hi, an issue was raised by our client which is about CP for FWKO drums and oil treaters. Because of the high operating temperature and pressure, the vessels are not internal coated. The size for the vessels is about 4 m by 27 m. The question is what type of CP is suitable for this big vessel...
