T9074-AS-GIB-010/271 Rev 1
o. Image archiving requirement, including software/hardware requirements to review archived files. p. Digital image archiving media requirements (e.g., magnetic, optical or flash).
A.2.1 Procedure Qualification. The procedure qualification should include qualification data from representative pipe sections at the upper and lower limits of the applicability of the procedure. As a minimum, this qualification shall include the smallest diameter and thinnest and thickest pipe wall thickness as well as the largest diameter and thinnest and thickest pipe wall thickness within the scope of the procedure. The procedure qualification shall be performed with the maximum insulation thickness to be inspected. The type of insulation does not need to be part of the qualification. The maximum insulation thickness to be inspected may be different for different pipe sizes and shall be documented as part of the scope of the procedure. Representative areas of inside diameter (ID) and outside diameter (OD) corrosion, including areas at least as thin as 25 percent remaining nominal wall thickness, shall be included in the qualification. Test pieces shall include representative samples with natural or prototypically simulated defects. If different radiation sources or X-ray energies are allowed by the procedure, the procedure qualification shall include the qualification of each source at the upper and lower limit of the pipe size and wall thickness for each type radiation source or X-ray energy. The results of the procedure qualification shall demonstrate the ability to accurately measure actual pipe thickness of the qualification test sample exposure within 5 percent of the nominal full pipe wall thickness, or 0.005 inch, whichever is greater. A.2.2 Procedure Approval. The inspection procedure shall be approved by the inspection activit y’s NDT Examiner. Documentation of the procedure qualification and a copy of the NDT Examiner-approved CR procedure shall be provided to NAVSEA 05P2 for information prior to implementation. NAVSEA 05P2 shall be notified at least thirty days prior to the inspection activity’s first application of the procedure such that a NAVSEA representative has the option to witness the init ial implementation. A.3 COMPUTED RADIOGRAPHY EQUIPMENT. The CR system shall be qualified and maintained under a documented CR system qualification procedure that shall be submitted to NAVSEA for information with the procedure in A.2.2. The procedure shall include details of periodic and specific equipment checks and specified intervals to ensure consistent system performance. The periodic equipment checks shall include the key attributes and equipment functions that are most likely to change over time and could affect measurement accuracy (e.g., imaging plate degradation/damage, scanner alignment, etc.). Records of the qualification shall be maintained by the inspection activity. A.4 COMPUTED RADIOGRAPHY PERSONNEL REQUIREMENTS. Inspection personnel shall be qualified and certified in accordance with a T9074-AS-GIB-010/271 personnel program. The requirements shall be documented in the inspection activity’s written practice and shall include the minimum training, testin g and experience requirements in CR for each level of certification. The written practice may include different requirements for personnel previously qualified using film-based radiography versus new CR inspectors. The CR qualification and certification shall require training, testing and experience specifically in CR. A copy of the written practice shall be provided to NAVSEA for information prior to implementation.
A.5 COMPUTED RADIOGRAPHY TECHNIQUE REQUIREMENTS.
A.5.1 Reference Standards. A reference standard with known dimensions shall be included in each exposure to calibrate each particular exposure as a result of geometric enlargement. The specific style and details of the reference standard may be selected by the NDT Examiner but must be defined in the procedure and used during procedure qualification. The calibration dimension on the reference standard shall be at least as large as the nominal pipe wall thickness of interest. Common reference standards include ball bearings, solid rods, and pipe segments with machined features. High density metallic foils may be used to wrap the reference standard to minimize radiation undercutting at the edge of the reference standard. If high density masking material is used during the procedure qualification, then similar masking must be used during production testing.
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