How to remove the Ferro oxide (Fe2O3) deposit inside the piping ?? 2

[Jeffrop]

Hi everyone,

The piping of our heat exchanger in 316 SS (1&quot was blocking by the deposit of Fe2O3 (solid) inside the pipe. Does any expert can suggest me a product to remove by dissolve the Ferro oxide (Fe2O3) and clean up the heat exchanger.

Thanks

 

[RGCook]

Formic acid is commonly applied to clean exchangers, on-line, in-situ. If you can take her down, you can probably get away with using HCl so long as the temperature is not high. It should remove it rather quickly I would think.

 

[eyadamk]

iron ions, in general, can be found as precipetated ions within 9 < PH < 1.8 under PH outside this range iron ions became soluble ... I do not know the material that flows through ur HEX but if u can manipulate PH.. this may help...

 

[kenvlach]

I have used nitric acid solutions for cleaning 304 & 316 SS HXers, usually 25-45 vol. % since this was readily available (Type VI Passivation solution per QQ-P-35C). This has the advantage of not attacking the metal. Also, after removal of the Fe₂O₃ (acid comes out clean), passivate with clean nitric solution and then rinse the HXer.

HCl will work quite well, but you should use an inhibitor. As Fe₂O₃ dissolves in HCl, the solution becomes more corrosive towards the metal.

 

[Jeffrop]

Gentlemen,

Thanks for your help, I will try its and let you know the result !

Have a good day !

 

[chasbo]

How about succinic acid solution?