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Repairing flange' surfaces
2

Repairing flange' surfaces

Repairing flange' surfaces

(OP)
Hi,

I have a damaged flange welded in a vessel, I am looking for repairing procedure, I have heard of inserting resin;
please check the pictures attached and let me know if there any solution or just remove the old one and replace it by a new one, do the hydrotest for the Vessel.

Thank you in advance

RE: Repairing flange' surfaces

It would be possible to machine, weld repair, finish machine, but it looks like you need a better solution. Replacement would be my choice.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube

RE: Repairing flange' surfaces

I agree with EdStainless that my first course of action would be replacement. If there is some reason this would not be feasible, I would machine in place, weld overlay/fill, and machine in place to within origin specifications.

Something to consider if you are using the machine in place method is the proper cleaning of the area, not only so your weld is sound, but you don't want some residue fume. I suppose this also applies to the remove and replace method, but it is often overlooked in small repairs such as this.

RE: Repairing flange' surfaces

energie19, first of all you need to investigate the cause of damage.

Regards
r6155

RE: Repairing flange' surfaces

Weld repair can be done or replacement. It comes down to mostly cost and schedule. I would indeed investigate what caused the wastage and go from there.

RE: Repairing flange' surfaces

Forget resin for pete sake. Air arc gouge, reweld and grind to a smooth finish if replacement with new flange is not feasible.

RE: Repairing flange' surfaces

" . . grind to a smooth finish"

Maybe. There is a reason that flange sealing surfaces have that grooved 'phonograph' finish. With a smooth face, the clamping force [minimum bolt torque/tension] needs to be greatly increased.
Smooth and flat/square, not wavy has usually worked for me, at pressures under 100 psi. I would not use smooth above 100 psi, or with toxic or flammable liquids.

RE: Repairing flange' surfaces

Quote (Duwe6)

Maybe. There is a reason that flange sealing surfaces have that grooved 'phonograph' finish. With a smooth face, the clamping force [minimum bolt torque/tension] needs to be greatly increased.
Smooth and flat/square, not wavy has usually worked for me, at pressures under 100 psi. I would not use smooth above 100 psi, or with toxic or flammable liquids.
^ This. They are made this way for a reason. Speak with your AI and replace the flange.

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