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Repair, Alteration & Rerating Procedures Flashcards

7 cards from real API 510 practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. According to API 510, weld overlay (cladding restoration) on a corroded vessel shell is classified as a:

    Answer: Repair requiring WPS qualification and authorized inspector involvement

    Weld overlay to restore corroded pressure-containing areas is a repair that requires qualified welding procedures and authorized inspector oversight.

  2. A pressure vessel owner wants to lower the MAWP of a vessel (rerate downward). Under API 510, this:

    Answer: Is generally straightforward and requires updating the nameplate and records

    Rerating to a lower MAWP is generally a simpler process but still requires updated documentation, nameplate changes, and notification to the inspector.

  3. When a repair is made by welding on a vessel in hydrogen service, which additional concern must be addressed?

    Answer: Hydrogen embrittlement risk and the need for bake-out procedures before welding

    Vessels in hydrogen service risk hydrogen-induced cracking; bake-out (degassing) before welding and careful preheat/PWHT practices are essential.

  4. Under API 510, which document establishes the minimum requirements for repair organizations performing welded repairs on pressure vessels?

    Answer: The National Board Inspection Code (NBIC)

    The NBIC (National Board Inspection Code) establishes the minimum requirements for repair organizations, including those holding the National Board 'R' stamp.

  5. After a repair, the inspector records the work on which form when using the National Board program?

    Answer: NB Form R-1 (Report of Repair)

    National Board Form R-1 is the official repair report that must be completed and filed for pressure vessel repairs under the R-stamp program.

  6. When performing a rerating calculation for a cylindrical shell under internal pressure using API 510, the formula used is based on:

    Answer: ASME Section VIII Division 1 thickness and stress equations for the shell

    MAWP calculations for cylindrical shells use the ASME Section VIII Div. 1 hoop stress equations, considering current thickness, allowable stress, and joint efficiency.

  7. A repair organization proposes to use a weld procedure not qualified to the current code edition for a vessel repair. Under API 510, this is:

    Answer: Unacceptable; all WPS must be qualified per an applicable welding code

    All welding on pressure vessels must be performed using WPS qualified to an applicable welding code such as ASME Section IX, regardless of welder experience.