T9074-AS-GIB-010/271 Rev 1
CHAPTER 5 LIQUID PENETRANT TESTING
5.1 INTENDED USE. The liquid penetrant test method is used for detecting the presence of surface discontinuities in ferrous and nonferrous materials. 5.2 DEFINITIONS. The standard terminology for liquid penetrant examination as described in ASTM E1316 shall apply to this section. 5.3 INSPECTION METHODS. The inspection method designation shall correspond to and use the material classifications specified in 5.3.1. 5.3.1 Liquid Penetrant Material. Unless otherwise specified, liquid penetrant material shall meet the requirements of SAE AMS 2644, and the total halogens and sulfur of each material shall not be greater than 1 percent by weight of the residue. The penetrant inspection materials are classified as follows: Penetrant types: Type 1- Fluorescent dye Type 2- Visible dye
Removal methods:
Method A- Water washable Method B- Post emulsifiable, lipophilic Method C- Solvent removable Method D- Post emulsifiable, hydrophilic
Fluorescent Sensitivity level: Level ½ – Ultra low Level 1 – Low Level 2 – Medium Level 3 – High Level 4 - Ultra high Sensitivity Level ½ applies to Type 1, Method A penetrants only. There is no sensitivity level classification for Type 2 penetrant systems. Development forms: Form a-Dry powder Form b-Water soluble Form c-Water suspendable
Form d-Nonaqueous Type 1 Fluorescent (solvent based) Form e-Nonaqueous Type 2 Visible Dye (solvent based) Form f-Specific application
5.4 GENERAL REQUIREMENTS. Penetrant testing shall be performed in accordance with a written procedure. Unless otherwise specified, the inspection zone for welds shall include the weld and ½ inch of adjacent base material on each side of the weld, where possible. Method C techniques shall not be used on threaded surfaces without approval of the authorized representative of NAVSEA. Method A shall not be used for welds, except for welds joining castings (casting to casting, or casting to other product forms) and weld repairs to castings, unless specifically approved by NAVSEA. Large inspection areas shall be divided into manageable sizes to ensure that all time requirements herein are met.
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