ASME does not have a code section that covers the repair of Section VIII, Division 1 pressure vessels. Repairs, therefore, fall under the National Board Inspection Code (NBIC). Dura-Strong Fabrication, LLC holds an R stamp and is authorized to do both shop and field repairs to ASME Sec. VIII, Div. 1, U stamped vessels. We cover an area that includes all of New Mexico, southern Colorado, eastern Arizona, and west Texas.
The National Board is the agency that oversees the requirements for repairs and alterations to ASME vessels. The following list is typical of the process for a repair to such a vessel:
- Investigate the repair that is required.
- Procure or purchase a copy of the original U1A report from either the manufacturer or National Board. The U1A provides needed information about the original vessel.
- Review the U1A to verify materials of construction, fabrication requirements, Non-Destruction Examination (NDE), and testing that was done when the vessel was created.
- Prepare a repair plan that includes a field traveler with hold-points for the Authorized Inspector (AI) .
- Identify the weld procedure to be used. This is defined by the repair to be done, the alloys being used, and the type of weld or welds to be used.
- Identify the welder and his or her qualifications.
- Prepare any drawings, calculations, and/or engineering data required.
- Procure and review documentation of any new material that must be utilized, usually Material Test Reports (MTRs).
- Specify any non-destructive testing that is required and verify that the NDE shop can do it. For instance, if doing a repair on a 3.5” thick shell and an x-ray is required, check with the NDE provider to ensure their x-ray source is powerful enough to penetrate that much steel.
- Specify any Post Weld Heat Treating (PWHT) requirements and if it should be localized to the repaired area or applied to the entire vessel.
- Specify the type and range of any pressure testing that is required.
- Prepare an R code nameplate with all applicable and correct data.
- Prepare an R Form with all applicable and correct data.
- All of the above information must be available for the AI to review as per the NBIC.
- Perform the repair as stated in the repair plan.
- Perform testing as required by the NBIC.
- Sign off on the appropriate documentation and have the AI sign the R Form after his or her final inspection.
- File the R Form with The National Board; this ensures that information about the repair to the code vessel is always on file.
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