T9074-AS-GIB-010/271 Rev 1
purposes shall be prohibited. Special conditions requiring deviation from the above require approval by an authorized representative of NAVSEA. 5.6.4 Penetrant Application. The surface to be tested shall be thoroughly and uniformly coated with penetrant and shall be kept wetted throughout the penetration dwell time. The penetrant dwell time starts when penetrant has been applied to the entire area being inspected. Any reduction in the liquid penetrant dwell time shall be specifically approved by NAVSEA. Unless prior approval has been obtained, the liquid penetrant dwell time shall be as follows:
Minimum penetration time (minutes)
Penetrant
15 1/
Type 2, Method C
Type 2, Method B or D
15 25 25 15 10 15
Type 2, Method A Type 1, Method A
Type 1, Method B or D, Level 1/2, 1, 2, 3
Type 1, Method B or D, Level 4
Type 1, Method C
1/ For Type 2, Method C penetrants only, the minimum dwell time may be reduced to 5 minutes provided: (1) the surface to be tested has not been exposed to lubricants, machining oils, or cutting fluids following welding, thermal cutting, or arc strike removal; or (2) the surface to be tested has been subjected to a heat treatment process above 1000 °F after exposure to lubricants, machining oils, or cutting fluids; or (3) the surface is being reinspected, and a 15-minute dwell time has already been utilized; or (4) exposure to lubricants machining oils, or cutting fluids is followed by a special cleaning operation as defined in the local procedure, qualified in a manner similar to the procedure of 5.6.2.1, and approved by the activity's NDT Examiner. 5.6.4.1 Application of Emulsifier (Methods B and D). The emulsifier shall be supplied by the same manufacturer as the penetrant and shall be applied in accordance with the manufacturer's instruction and as specified in 5.4.1.
5.6.5 Removal of Penetrant.
5.6.5.1 Method C Materials. The excess penetrant shall be removed from all surfaces as follows: a. As much excess penetrant as possible shall be removed by first wiping the surface thoroughly with a clean dry cloth or absorbent paper. b. The remaining excess penetrant shall be removed by wiping the surface with a clean cloth or absorbent paper dampened with a penetrant remover specified by the penetrant material manufacturer. (Note that for very smooth surfaces, the use of remover may not be necessary, and if used, could result in over cleaning.) c. Flushing of the surface with any liquid following application of the penetrant and prior to developing shall be prohibited. 5.6.5.2 Method B and D Materials. Subsequent to completion of emulsification, the emulsifier shall be removed from the surface of the part by employing a warm water spray not greater than 120 °F and 40 pounds per square inch (psi) pressure. After washing, items to be inspected using Type 1 materials shall be checked under a black light to ensure complete cleaning. Alternatively, the penetrant shall be removed by use of the remover specified by the manufacturer of the penetrant. 5.6.5.3 Method A Only. The penetrant shall be removed from surfaces by swabbing with a clean lint-free cloth saturated with clear water or by spraying with water not greater than 120 °F and 40 psi. After washing, items to be inspected using Type 1 materials shall be checked under a black light to ensure complete cleaning.
5-4
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