Interesting. You still haven't answered our (my) other questions regarding this job.
Simply, it isn't always a matter of code. What do your job specs say?
Have a Great Day, Brent
I would think that MAXIMUM wall would be a more relevant issue.
Depends on a million factors, probably none of which are in a code, half of them are in the contract, and the other half are experience. If you are on pressure piping, (should be a CJP), the customer will probably tell you all about it. Corrosive environment is probably the biggest deciding factor. If is a structural piece, it is less important.
he is the customer
it is a nuclear plant he wants to fix bad pipe
hope this helps
sincerely,
Kent
Mohsen, I take it you are referring to this Duplex pup piece that you have mentioned in another post?.
This sort of activity is performed every day, a thousand times I'm sure. It is the bread and butter of pipeliners. Every 'get out' clause has been tried and seen thru. The fact that you are asking these standard of questions on here makes me question the competency of you or your company to be performing this type of work.
If you don't purge, gain permission to use paste (unlikely) or get a joint design passed with no open root penetration accepted (even more unlikely (PJP)), you may as well weld in a piece of carbon steel. Duplex steel has been chosen, then it's more than likely to have been chosen for a reason i.e. it's corrosion resistance. I have never seen an open root pipe weld of any OD in Duplex material that didn't have some sort of purge applied, regardless of wall thickness.
Right! Even if he did a CJP with a backing ring or a PJP closed up tight, the heat tint or color he will get on the inside could be enough oxidation to corrode the inside of the pipe quicker.
mohsen,
where is this pipeline?
I will come fix it
sincerely,
Kent
I do have some ideas where it is
The need for purging the root pass is dependent on type of material, not wall thickness.
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