new Pressure vessel, nozzle neck alteration
new Pressure vessel, nozzle neck alteration
(OP)
I have a an ASME VIII Divison 1 vessel which is now finished, tested and sitting at site.
However i want to cut a nozzle neck pipe of 2" in order to change the direction so a cut + 2 x 45° elbows may resolve the problem, but i'm not sure that such alteration need a new hydrotest or not, or this depend on cutting point on nozzle pipe neck??
Thxxx
However i want to cut a nozzle neck pipe of 2" in order to change the direction so a cut + 2 x 45° elbows may resolve the problem, but i'm not sure that such alteration need a new hydrotest or not, or this depend on cutting point on nozzle pipe neck??
Thxxx





RE: new Pressure vessel, nozzle neck alteration
Cheers,
gr2vessels
RE: new Pressure vessel, nozzle neck alteration
best regards
RE: new Pressure vessel, nozzle neck alteration
Cheers,
gr2vessels
RE: new Pressure vessel, nozzle neck alteration
For your odd case, the requisite stamp can be either be the manufacturers "U" stamp [new vessel, never been in service], or another organization's "R" stamp. If it was mine, I would 'shop' for an "R" stamp operation with a 'reasonable' AI. I see this as a "Repair of a Routine Nature", meaning that Code-wise it is deemed to only require a memo in the vessel's file, not a full-blown "R-1" report with mandatory AI Hold-Point(s). Most AI's should, too [but not all - they have a lot of discretion on disallowing Routine Repairs]
It is your vessel, but the "U"-stamp on the Code Data Plate really means that "U don't mess with it". All stamp-holding Code Shops have had to prove that they understand all the rules and possible pitfalls of pressure vessels. If you, or sombody you hire, does not have the appropriate Code Stamp, it is not legal to perform the work. Sorry.
RE: new Pressure vessel, nozzle neck alteration
RE: new Pressure vessel, nozzle neck alteration
RE: new Pressure vessel, nozzle neck alteration
The following should not be considered alterations:
any comparable or duplicate replacement,
the addition of any reinforced nozzle less than or equal to the size of existing reinforced nozzles,
and the addition of nozzles not requiring reinforcement.
You didn't say if the equipment was placed in service or not. If it was, API 510 gouverns otherwhise two solutions could be followed:
-If it's an alteration a new design data had to support the changes made
-If it's not an alteration run the vessel for a period of time (API 510 will gouvern then) and after that make the change you want.
As far as I know also and correct me if I'm wrong piping components are not considered parts of a pressure vessel. It is wise to consult with a pressure vessel engineering for more details.
Best Regards
RE: new Pressure vessel, nozzle neck alteration
the plant is under construction
mastertiger i think that nozzle pipe neck is included on pressure vessel boundary, concerning API 510 i didn't found any of this type of intervention.
Best regards
RE: new Pressure vessel, nozzle neck alteration
RE: new Pressure vessel, nozzle neck alteration
If this vessel is not stamped, shorten the neck using a welding procedure and welder(s) certified to ASME Sect IX. If the existing welds on this nozzle were X-rayed [almost certainly they were not, then you are required to X-ray the finished weld. In other words, you need to duplicate what was done when the vessel was originaly fabricated. Add the records of your change(s) to the vessel documentation 'package'.
If it were my vessel, I would use the services of a certified API-510 Inspector to oversee this work and have him/her decide about what testing [if any] will be required on the new weld. This Inspector will take care of generating the appropriate documentation of this change to your vessel.
RE: new Pressure vessel, nozzle neck alteration
RE: new Pressure vessel, nozzle neck alteration
The only other way to be certain that a purported expert is actually as good as he/she claims is to ask if they hold a National Board certification. Otherwise, you can make your 'best guess' if "the 'ordinary' engineers who are obeying the code?". Just because an engineer wants to get it right doesn't make that person capable of getting it right.
I don't recommend hiring non-degreed engineers to do engineering design work, nor do I use 'just another engineer' to do Code inspections, evaluations, or documentation.
RE: new Pressure vessel, nozzle neck alteration