Nozzle Repairs and ASME Standards

I agree. Leaving it with a blind flange would be more practical and less likely to increase cost or cause further problems, providing that you obtain the proper consent.

I presume the vessel is brand new (still under construction). Nothing in ASME VIII about patches because patching is an in-service repair method (see NBIC Code, API 510 etc.), not for new construction. So your best bet is to replace the whole plate containing the opening cut in the wrong place.

Obviously the design will need to be amended to reflect new nozzle, compensation etc, and the drawings will need to be changed accordingly.

So your best bet is to replace the whole plate containing the opening cut in the wrong place.

Instead of the vessel is new one under construction, no need -as per ASME code- to replace the whole plate when you need to proceed such a modification.

Dear Sir,

Thank you very much Sir, i voted for best answer.

Best regards,

Faizol

Obviously many ways to solve this problem. I agree with the comments regarding "dead-leg" being created by simply blinding the existing nozzle. Particularly if the vessel is to operate in highly corrosive environment e.g. sour service.

Just a minor clarificaton. It's not the VESSEL itself which has the R stamp but the ORGANIZATION authorized to carry out pressure vessel repairs.

It's not the VESSEL itself which has the R stamp but the ORGANIZATION authorized to carry out pressure vessel repairs.

When the vessel is required to be certified as per U-stamp, there must be a manufacturer who hold a valid certificate of authorization U-stamp, and there must be a nameplate assembled to the vessel itself which containing the symbol U prepared by the manufacturer as detailed in ASME VIII, Div.1.

Also, when such a repair is required for a vessel which certified a U-stamp, there must be an organization hold a valid certificate of authorization R-stamp and must be certified through a nameplate assembled to the vessel itself which containing the symbol R prepared by the manufacturer as detailed in NPIC, NB-23.

Yes, but only if NB-23 and the certifications / stamps it stipulates are recognized by the local jurisdiction. Very few jurisdictions outside USA / Canada recognize or mandate NB-23; where NB-23 is not mandatory, the repair organizations are not required to hold R-stamp certification.

Here, I speak about/from the code point of view, not for any stipulation or any local jurisdictions.

R-stamping must be carried out by an organization holding R-stamp, and only required for those pressure vessels certified with U-stamp. That is means that if you have a pressure vessel not certified a U-stamp, in this case the repair work can be proceeded by any organization and not mandatory to hold R-stamp, and inturn no issuing for any R-stamp for that vessel.

In other words, if you have an organization not holding R-stamp, in this case they can proceed such a repair without certification (for the organization itself nor for the vessel), but in case that the repaired vessel was U-stamped, the repair work (without certification) shall violate the U-stamp of the vessel.

Dear Abdel, thank you for you in-depth comments. Would you be able to direct me to the specific Code (ASME, NBIC, API etc.) paragraph which talks about "violation" of the U-stamp?

Without explicit express by the code, the violation to the U-stamp of a vessel shall be occurred if the repair/alteration/rerating carried out by an organization not holding certificate of authorization R-stamp. The manufacturer himself and who hold only the certificate of authorization U-stamp, is not authorized to proceed any repair work nor issuing any certification for that repaired work unless he hold a valid R-stamp certificate of authorization.

The following wording written into any specification will provide for an ASME Code vessel. "A manufacturer's data report for pressure vessels, Form U-1 (for example) as required for the ASME Code rules, is to be furnished to the owner. This form must be signed by a qualified inspector, holding a National Board Commission, certifying that construction conforms to the latest ASME Code Section VIII, Div. 1 for pressure vessels. The ASME symbol "U" must also be stamped on the Nameplate of the vessel".

In addition, it should be stated "The Manufacturer must be registered with the National Board." So, for any repair/alteration/rerating for a code item, there must be an authorized repaired organization registered with the National Board to be authorized to issue and fill all the forms as per the code. Otherwise the jurisdiction shall not accept the work and a violation to the stamp will occurs .

Again I would like to point out that you are considering only one scenario, where the stipulations of NBIC Code (e.g R-stamp) apply. I would like to refer you to API 510 "Pressure Vesel Inspection Code: Maintenance Inspection, Rating, Repair and Alteration". In particular items 3.16 and 4.5 "repair organization" and Section 7 "Repairs, Alterations and Rerating of Presure Vesels".

For the tenth time, I speak about the code item (vessel/component), i.e. those vessels/components which are certified by a certificate of authorization U-stamp, where any repair for that code item (vessels/components) shall be certified by R-stamp holder and there will be a nameplate stamped with symbol stamp "R".

That is clear in API 510, Para. 3.16.a (The holder of a valid ASME Certificate of Authorization that authorizes the use of an appropriate ASME Code symbol stamp).

Otherwise, any repair work for a non-code item (vessel/component) can be carried out by any proper procedure or standard to be carried out by any experienced repairing organization where it is not mandatory to hold a certificate of authorization.

Note. I promise that my subsequent post #1000 will be under another thread title other than "Nozzle Repairs and ASME Standards".

The complete paragraph is as follows:

3.54 repair organization: Any one of the following who makes repairs in accordance with the inspection code:
a. The holder of a valid ASME Certificate of Authorization that authorizes the use of an appropriate ASME Code symbol stamp
(e.g. U-stamp).
b. The holder of a valid R-stamp issued by the National Board.
c. An owner or user of pressure vessels who repairs his or her own equipment.

d. A contractor whose qualifications are acceptable to the pressure-vessel owner or user.

e. An individual or organization that is authorized by the legal jurisdiction.

... so a contractor whose qualifications are acceptable to the PV owner / user is suitable for repairs alterations of a PV.

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