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replacing the 12" RFSO flange

replacing the 12" RFSO flange

replacing the 12" RFSO flange

(OP)
Dear experts,

We have a 12" shell nozzle made from 12" RFSO 15# flange.

After installation to the tank by mistake the surface of this nozzle is damage and client instructed us to replace.

DO you have the procedure for this purpose ?

I would use arc gouge to gouge the fillet weld. Due some grinding on the neck then install the new flange and due PT.

There is also suggestion to cut the neck and make a new spool (flange with neck). If we are using this method, is there any clause in API 650 about how far minimum the but weld joint on the neck of the nozzle to the shell or to fillet weld ?

The projection from the shell to this nozzle is 250 mm.

Any comments would be appreciated.

RE: replacing the 12" RFSO flange

I think I would cut off the flange and replace it with a weld neck flange

RE: replacing the 12" RFSO flange

(OP)
Good morning IFRS,

Yeah this is also good alternative.

We measure the length of the WNRF nozzle from the flange surface to the end of the neck. Then we cut the existing shell nozzle based on that length.

So we will have but weld joint from WNRF to existing nozzle neck.

PT for this butt weld I believe is sufficient.

Regards,

Syah

RE: replacing the 12" RFSO flange

PT, or MT if it is magnetic, are good choices. With PT you can ensure that there are no pinhole leaks.

RE: replacing the 12" RFSO flange

(OP)
Ok Duwe6,

Thanks for your advice.

RE: replacing the 12" RFSO flange

Do it like IFRs suggests! You'll save your self a lot of heart acne and money if you do!

RE: replacing the 12" RFSO flange

(OP)
Yes 11echo,

That is the best and economist way.

Thanks

Syah

RE: replacing the 12" RFSO flange

Weld neck is a tricky weld to make in the field, and requires x-ray. I would gouge the damaged flange off, and replace with RFSO. Is there concern with heat affected zone HAZ? Remove 1/2" past weld from the neck- there will likely still be plenty of projection.

Does the job- economical-

RE: replacing the 12" RFSO flange

I have to respectfully disagree with roughandtumble, I work out in the oil fields and we add weld neck flanges to existing piping all the time, same thing with X-raying the weld ...IF needed. PLUS using a weld neck flange you can now match the existing nozzle projection off the tank and have the capability to bolt up to any existing piping WITHOUT any modification.

RE: replacing the 12" RFSO flange

The only time a weld neck would get tricky is if it were low to the ground. Have done many of these modifications with x-ray no problems and like 11echo stated you should be able to meet your desired projection still.



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