SECTION III PRETESTING, CLEANING, PRECLEANING AND POSTCLEANING

Figure 2-7. Flow Chart for Postemulsifiable, Hydrophilic Penetrant Process (Method D)

TM-1-1500-335-23 Nondestructive Inspection Methods Manual
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T.O. 33B-1-1 2-18 SECTION III PRETESTING, CLEANING, PRECLEANING AND POSTCLEANING 2.3 PRETESTING, CLEANING, PRECLEANING AND POSTCLEANING. 2.3.1 Introduction. 2.3.1.1 Purpose Of This Section. The treatment and condition of parts prior to inspection have a significant influence on the results of the inspection process. Nondestructive inspection personnel must be aware of the pre-inspection surface treatment processes and their effects on the penetrant process. This section provides the necessary background information but does not contain enough information to permit selection of a cleaning process or to perform major cleaning operations. However, there is information on pretesting and precleaning procedures which NDI personnel perform. 2.3.1.2 Definitions. 2.3.1.2.1 Pretesting. Pretesting is done to determine the compatibility of penetrant materials with parts made of a material that has no history of being successfully inspected with liquid penetrants. 2.3.1.2.2 Cleaning. Cleaning, is the initial removal of soil, corrosion and paint accomplished by the corrosion control or cleaning shop. 2.3.1.2.3 Precleaning. Precleaning is the surface preparation performed by NDI personnel just prior to inspection, to remove light soils that have accumulated during service or since major cleaning. 2.3.1.2.4 Postcleaning. Postcleaning follows penetrant inspection to remove residual penetrant materials. 2.3.2 Pretesting. 2.3.2.1 Purpose Of Pretesting. Some nonmetallic parts, such as plastics, rubbers and plexiglass, may react with the oils and solvents contained in penetrant inspection materials. These oils and solvents can cause swelling, softening, distortion, crazing, or other surface effects resulting in damage to the part. The purpose of pretesting is to ensure that parts to be inspected will not be damaged by penetrant materials. All nonmetallic parts that have not been previously inspected, and which do not have approved technical or nondestructive inspection procedures, SHALL be pretested. 2.3.2.2 Pretesting Procedure. NOTE If necessary, the cognizant ALC NDI Manager or responsible engineering authority should be contacted for assistance. Some materials may not show effects until they are subjected to service conditions (aging, cold, heat, moisture).

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