Corrosion below ring groove

[metboss]

Hi all,

Please refer to photograph and advise me how we can mitigate the risk of corrosion on area a just below the ring groove. Material specification is as follows:

Flange AISI 4130
Ring grove cladding: Inconel 625
Ring Gasket: SS316
Standard: API 6A

Note: Area corroded highlighted in green on the attached photograph.

 

[weldstan]

I assume that the 625 alloy is corroding. If so, you need to upgrade the alloy; e.g., 622, 686, etc.

 

[LittleInch]

Clad the entire face with 625? It looks like something is gathering in the flange gap and eating the flange material? Bit difficult to see. A sideways view or draw a section through the rather mighty looking flange

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