NonDestructive Testing

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Non-Destructive Testing

• NDT

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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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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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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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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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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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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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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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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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