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API-51
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API-51

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@BestPerformingPlateau

Questions and Answers

What is the maximum length of linear indications that are evaluated as relevant in a continuous 12 in. length of weld?

  • 1 in. (25 mm) (correct)
  • 1/2 in. (12.5 mm)
  • 2 in. (50 mm)
  • 3/4 in. (18.75 mm)

    • How should indications with a maximum dimension of 1/16 in. (2 mm) or less be classified in liquid penetrant testing?

  • Relevant
  • Critical
  • Nonrelevant (correct)
  • Acceptable

    • What should be done if doubt exists about the type of imperfection being disclosed by an indication?

  • Immediate rejection of the weld
  • Verification using other NDT methods (correct)
  • Reporting to the company without further action
  • Ignoring the indication

    • How are indications produced by liquid penetrant testing classified if their maximum dimension is larger than 1/16 in. (2 mm) and believed to be nonrelevant?

    <p>Reexamined by liquid penetrant or another NDT method</p> Signup and view all the answers

    What is the minimum width for transverse macrosection test specimens for hardness tests?

    <p>1/2 in. (13 mm)</p> Signup and view all the answers

    Which etchant can be used to give a clear definition of the weld structure?

    <p>Nital</p> Signup and view all the answers

    What type of lighting is recommended for visually examining macrosections?

    <p>Lighting that sufficiently reveals the details of the weld soundness</p> Signup and view all the answers

    What type of indenter and load should be used for hardness testing?

    <p>Vickers indenter and a 10-kg load</p> Signup and view all the answers

    Where should HAZ hardness impressions be located?

    <p>Entirely within the HAZ and as close as possible to the fusion boundary</p> Signup and view all the answers

    When is Charpy impact testing required?

    <p>When specified by the company</p> Signup and view all the answers

    How many valid specimen tests are required for each test of weld metal or HAZ for Charpy impact testing?

    <p>At least three</p> Signup and view all the answers

    What should be the orientation of the notch for Charpy impact testing?

    <p>In the through-thickness direction</p> Signup and view all the answers

    What is the minimum design temperature for Charpy impact testing?

    <p>At or below the minimum design temperature</p> Signup and view all the answers

    What is the purpose of the notch in Charpy impact testing?

    <p>To create a stress concentration</p> Signup and view all the answers

    What must be determined through chemical analysis when hardness testing is required?

    <p>Carbon equivalent of the base materials</p> Signup and view all the answers

    What is the maximum hardness value for repair welds?

    <p>As specified in Table 6, unless otherwise specified by the company</p> Signup and view all the answers

    What type of testing is required for weld imperfections?

    <p>Ultrasonic testing</p> Signup and view all the answers

    In what circumstances are mechanical measurements governing?

    <p>When both mechanical and radiographic measurements are available</p> Signup and view all the answers

    When are company authorization required for weld repairs?

    <p>For certain types of weld repairs</p> Signup and view all the answers

    In what circumstances can shallow crater cracks or star cracks in weld reinforcement be repaired by grinding?

    <p>Only with prior company authorization</p> Signup and view all the answers

    When can defects other than cracks be repaired?

    <p>With prior company authorization and a qualified repair procedure</p> Signup and view all the answers

    What type of repairs may be used to remove defects in the reinforcement of root beads and cover passes?

    <p>Grinding repairs</p> Signup and view all the answers

    When do back weld repairs require a qualified repair procedure?

    <p>When permitted by the company</p> Signup and view all the answers

    In what circumstances does double repair of welds require prior company authorization?

    <p>Always</p> Signup and view all the answers

    What governs the length of repair areas within a completed weld for a partial thickness or full thickness repair?

    <p>Sound welding practice and engineering analysis</p> Signup and view all the answers

    For small diameter pipes, when do all repairs require company authorization?

    <p>Always</p> Signup and view all the answers

    What is the minimum deposited repair weld length?

    <p>2 in. (50 mm)</p> Signup and view all the answers

    When must a repair procedure be reestablished and requalified?

    <p>When any change occurs</p> Signup and view all the answers

    What type of testing may be required for partial thickness and full thickness repair procedures?

    <p>Charpy impact testing</p> Signup and view all the answers

    What is the minimum length of the test weld for qualifying repair procedures?

    <p>8 in. (203 mm)</p> Signup and view all the answers

    Which type of repair procedures include full thickness, internal and external partial thickness, cover pass, and back weld repair?

    <p>All of the mentioned repair procedures</p> Signup and view all the answers

    What type of testing is used for weld reinforcement on tensile test specimens?

    <p>Nick break testing</p> Signup and view all the answers

    What are the changes that require requalification of a repair procedure?

    <p>Change in repair limitations</p> Signup and view all the answers

    What type of testing is used for testing of repair welds?

    <p>Hardness testing</p> Signup and view all the answers

    What is the qualification length for each repair type?

    <p>8 in. (203 mm)</p> Signup and view all the answers

    What type of testing is used for defect exploration and removal?

    <p>Macrosection testing</p> Signup and view all the answers

    What is the minimum length of the repair weld for qualification?

    <p>8 in. (203 mm)</p> Signup and view all the answers

    When is NDT (Non-Destructive Testing) required for repair procedures?

    <p>At the company's discretion</p> Signup and view all the answers

    What are linear indications in weld inspection?

    <p>Indications with a length more than three times the width</p> Signup and view all the answers

    When are crater cracks or star cracks considered defects in weld inspection?

    <p>When they exceed 5/32 in. (4 mm) in length</p> Signup and view all the answers

    How are linear indications evaluated as defects in weld inspection?

    <p>If they exceed 1 in. (25 mm) in total length in a continuous 12 in. (300 mm) length of weld</p> Signup and view all the answers

    What happens to base material imperfections detected by liquid penetrant testing in weld inspection?

    <p>They are reported to the company for disposition</p> Signup and view all the answers

    How are indications produced by ultrasonic testing treated in weld inspection?

    <p>They may not necessarily be defects, as they can be caused by various imperfections</p> Signup and view all the answers

    How are acceptance standards for different types of indications specified in weld inspection?

    <p>They are specified for cracks, surface, buried, and volumetric indications</p> Signup and view all the answers

    What is considered a defect in weld inspection?

    <p>Accumulation of relevant indications exceeding specific lengths in a given area</p> Signup and view all the answers

    How are linear, transverse, and volumetric indications defined and categorized in weld inspection?

    <p>Based on their characteristics and dimensions</p> Signup and view all the answers

    What is the criterion for considering linear indications as defects in weld inspection?

    <p>Exceeding specific lengths in a given area</p> Signup and view all the answers

    How are nonrelevant indications of the same type treated in weld inspection?

    <p>They do not need to be reexamined after one is determined to be nonrelevant</p> Signup and view all the answers

    What happens to relevant indications caused by imperfections in weld inspection?

    <p>They are considered defects under certain conditions</p> Signup and view all the answers

    Study Notes

    Weld Inspection Standards and Procedures

    • Nonrelevant indications of the same type do not need to be reexamined after one is determined to be nonrelevant
    • Relevant indications caused by imperfections are considered defects under certain conditions
    • Linear indications are those with a length more than three times the width, rounded indications have a length three times the width or less
    • Crater cracks or star cracks exceeding 5/32 in. (4 mm) in length are considered defects
    • Linear indications evaluated as cracks other than crater cracks or star cracks are considered defects
    • Linear indications evaluated as IF and exceed 1 in. (25 mm) in total length in a continuous 12 in. (300 mm) length of weld or 8% of the weld length are considered defects
    • Base material imperfections detected by liquid penetrant testing are reported to the company for disposition
    • Indications produced by ultrasonic testing may not necessarily be defects, as they can be caused by various imperfections
    • Linear, transverse, and volumetric indications are defined and categorized based on their characteristics and dimensions
    • Acceptance standards for different types of indications, including cracks, surface, buried, and volumetric indications, are specified
    • Maximum dimensions are defined for different types of indications to determine if they are defects
    • Accumulation of relevant indications exceeding specific lengths in a given area is considered a defect

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    Description

    Test your knowledge of weld inspection standards and procedures with this quiz. Learn about relevant and nonrelevant indications, defect criteria, types of indications, acceptance standards, and more.

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