Repairing flange' surfaces 2

[energie19]

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

 

[SnTMan]

energie19, from a site search:

http://www.eng-tips.com/viewthread.cfm?qid=341709,

and from Google:

http://www.furmanite.com/services/on-site-machining-osm/field-machining-flange-facing/

Don't know about a resin process, may be one out there. I'd be leery of it though.

Regards,

Mike



The problem with sloppy work is that the supply FAR EXCEEDS the demand

 

[EdStainless]

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

 

[fegenbush]

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.

 

[r6155]

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

Regards
r6155

 

[metengr]

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.

 

[chicopee]

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

 

[Duwe6]

" . . 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.

 

[MrGezus]

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.