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I'm so grateful for your great advices. I'll be considered them

@0707 We want to apply PTFE lining inside the tank

@Edstainless Thanks for your great answer.

@Edstainles As you see, this mounds are every where. On weld and plate. How we can considered that's the weld problem?

After cleaning the mountshttps://files.engineering.com/getfile.aspx?folder=9a316b30-2aff-4044-a7ad-e897408ac894&file=Screenshot_20200822-004156.jpg

Photo of small mountshttps://files.engineering.com/getfile.aspx?folder=22032fb9-a1a3-4808-b6bc-9ba2bf2a2c75&file=Screenshot_20200822-004031.jpg

@gtaw Sry i couldn't finde your email add. This is the photo of inside the tankhttps://files.engineering.com/getfile.aspx?folder=385584df-437a-48dd-a4f0-6b74d19aaca0&file=Screenshot_20200822-004103.jpg

@gtaw May i have your email address?

@gtaw Those pics were amazing. It seem we have a same problem. I'll send more photo from inside of the tank. Before and after cleaning. There are many mounds of brown jello. Now i have little problem with sending photo. I'll be send them as soon as i can. Best regards.

@0707 As i know, we can not use hydro test limits for in service condition. Because we have many tensions in hydro test.

@Edstainless You say the building-up the welds, didn't works?

@0707 is it your answer based on the hydro test limits?

@littlench I said that. Temp. Is ambient. Between 30-50°C. Based on API 571 clause 4.5.1 all of the s. S. 300 series has been affected from from Cl scc. Now i dont have the doc. But tommorow i can say to you the thickness. Diameter of the tank is 12m. Water analys is attached. COD=24 ppm BOD=...

Is any reference for this topic?

We make this tank. All welders were qualified. All the tank has been tested by RT. Water came from the river, and we treated the water, some part of the water go to the DM unit and some part of the water go through the active carbon and come into this tank. This case have been happened after...

Yeah pitting already started. I suggest first of all, building-up the weld and then use a suitable liner or paint on inside the tank

Thanks for your tips. All of the welds have been tested by RT and they were acceptable. But now welds have pinholes and we have leakage from those

Hello everyone. I have little problem. We have a potable storage tank that hase been made by stainless steel 304. But the concentration of chloride is about 130 ppm. Corrosion is start in near the welding. That was design problem, and we cannot change the material. What is the solution? Can we...