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NonDestructive Testing

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NDT is, 'an examination of an object which will not impair its future usefulness' ... testing to Jaeger 1 lettering vs. SNT-TC1A which allows Jaeger 2 lettering ... – PowerPoint PPT presentation

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Title: NonDestructive Testing


1
Non-Destructive Testing
  • NDT

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2
Topics
  • Benefits and types of NDT
  • Electric Boat requirements
  • Results of Electric Boat NDT audits and typical
    deficiencies noted
  • Improving compliance

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Benefits of NDT
  • NDT is, an examination of an object which will
    not impair its future usefulness.
  • NDT allows 100 examination of parts, welds, etc.
    when required.
  • Ensures compliance to specifications.
  • Prevents catastrophic failures.
  • NDT is a part of the Navys Level I and SUBSAFE
    programs.

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7 Major NDT Methods
  • Visual Testing (VT)
  • Liquid Penetrant (PT)
  • Magnetic Particle (MT)
  • Radiographic (RT)
  • Ultrasonic (UT)
  • Eddy Current (ET)
  • Material Verification (MV)

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Topics
  • Benefits and Types of NDT
  • Electric Boat requirements
  • Results of Electric Boat NDT audits and typical
    deficiencies noted
  • Improving compliance

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Electric Boat Requirements
  • Methods that Electric Boat uses to invoke
    specific NDT requirements upon suppliers
  • Standard Clauses in Purchase Order
  • Various Standards and Specifications (Military,
    Federal, ASTM, E.B. Specifications, etc.)
  • Electric Boat 2678, Quality Control Requirements
    For Procured Material (VPARS)

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Electric Boat Requirements
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Electric Boat Requirements
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Electric Boat Requirements
  • S/C 60-67
  • Nondestructive Test Procedure Approval
  • Requires suppliers to submit NDT procedures to EB
    for approval on a VPAR
  • Defines general requirements of NDT procedures
  • Applies to suppliers sub-tier NDT suppliers

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Electric Boat Requirements
  • S/C 76-22A MT test reports
  • S/C 76-22B LP test reports
  • S/C 76-22C UT test reports
  • S/C 76-22F LP of K-Monel
  • S/C 76-22G 5x VT
  • S/C 76-22J VT test reports of castings
  • S/C 76-22H VT test reports for welds

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Electric Boat Requirements
  • S/C 76-95 RT film retention by EB
  • S/C 76-24 Requirements for RT of castings
  • S/C 76-22L NDT IAW with drawings or spec

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Topics
  • Benefits and Types of NDT
  • Electric Boat requirements
  • Results of Electric Boat NDT audits and typical
    deficiencies noted
  • Improving compliance

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13
EB NDT Audit Results
  • Audited 65 of approximately 230 suppliers
  • Significant deficiencies noted in 29 audits
  • Poor audit performance rate of 44.6

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EB NDT AUDIT RESULTS
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EB NDT Audit Results
  • Categories of Deficiencies
  • Inspector performance
  • Qualifications
  • Equipment
  • Procedures

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EB NDT Audit Results
  • Inspector performance MT
  • 1 inch overlap not used during test
  • Incorrect use of field indicator
  • Incorrect removal of MT particles

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17
EB NDT Audit Results
  • Inspector performance PT
  • Incorrect pre-cleaning
  • Incomplete penetrant coverage
  • Improper drying of test surface during PT

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EB NDT Audit Results
  • Categories of Deficiencies
  • Inspector performance
  • Qualifications
  • Equipment
  • Procedures

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EB NDT Audit Results
  • Qualifications
  • Re-qualification by letter versus re-test
  • Inspectors qualified to AWS versus MIL-STD-271
  • Wrong vision test administered
  • Vision test records incomplete-do not state
    with/without glasses
  • Number of test questions not in accordance with
    SNT-TC-1A

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EB NDT Audit Results
  • Categories of Deficiencies
  • Inspector performance
  • Qualifications
  • Equipment
  • Procedures

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21
EB NDT Audit Results
  • Equipment
  • UT equipment not calibrated properly
  • Gages for water temperature and pressure not
    calibrated during water washable PT
  • No field indicator at job site
  • No blow ball for removal to particles during MT

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EB NDT Audit Results
  • Categories of Deficiencies
  • Inspector performance
  • Qualifications
  • Equipment
  • Procedures

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23
EB NDT Audit Results
  • Procedures
  • Company Written Practice permits re-qualification
    by letter versus re-test
  • PT procedure does not address pre-cleaning
  • Procedure not approved per S/C 60-67
  • Improper transfer of procedures

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24
VPAR Approval
EB EVALUATION AMC PT-2 Rev. 1 4/30/03 with Tech
No. 05-03 5/2/03 is approved for LPT of cladding
to T9074-AD-GIB-010/1688 with acceptance to
MIL-STD-2035 class 3 inboard, Class 1 for seating
or seal area class 2 for outboard surfaces as
required by T9074-AD-GIB-010/1688. Reviewed to
T9074-AS-GIB/271.
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Topics
  • Benefits and Types of NDT
  • Electric Boat requirements
  • Results of Electric Boat NDT audits and typical
    deficiencies noted
  • Improving compliance

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Improve Compliance
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27
Improve Compliance
  • Mil-Std-271 / Tech-Pub-271 is the top tier
    document over SNT-TC1A
  • Mil-Std-271 requires re-certification by
    re-examination vs. SNT-TC1A which allows
    recertification by satisfactory performance
  • Mil-Std-271 requires vision testing to Jaeger 1
    lettering vs. SNT-TC1A which allows Jaeger 2
    lettering

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Improve Compliance
  • Personnel Qualification
  • Must be in accordance with Mil-Std-271 /
    Tech-Pub-271 Paragraph 1.6 in addition to the
    requirements of SNT-TC-1A, 2001.

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Improve Compliance
  • Review your companys Written Practice for
    compliance with BOTH Mil-Std-271 / Tech-Pub-271
    and SNT-TC-1A
  • Inspectors performance must be audited
    periodically (recommended at least yearly)
  • Calibrate equipment (pressure gages,
    thermometers, etc.)

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Improve Compliance
  • Transfer of NDT procedures from one activity to
    another activity is prohibited without specific
    NAVSEA approval

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Improving Compliance
  • The effectiveness of NDT depends upon the
    capabilities of the personnel who are responsible
    for and perform NDT.
  • Questions regarding this presentation can be
    directed to Electric Boat Supplier Quality or
    Electric Boat NDT Engineering.

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Conclusion
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Conclusion
  • The stakes are high!
  • Given a choice we would rather answer a question
    than solve the problem

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