T9074-AS-GIB-010/271 Rev 1
Table 3-3. Minimum Radiographic Quality Levels for Iridium-192 and Selenium-75 (Only Applicable to Group 1 and Higher for Selenium) Radiography of Castings and Welds In Piping, Machinery and Pressure Vessels.
Type of Exposure and Viewing Technique
Nominal Penetrameter Thickness (Inches)
Actual or Nominal Single Wall Thickness (Inches)
Source-Side Penetrameter Number 1/
Minimum Perceptible Hole
Nominal Diameter of Penetrameter Hole (Inches)
Up to 0.199 0.200 – 0.235 0.236 – 0.275 0.276 – 0.298 0.299 – 0.321 0.322 – 0.343 0.344 – 0.359 0.360 – 0.375 0.376 – 0.432 0.433 – 0.489 0.490 – 0.547 Up to 0.500 0.501 – 0.555 0.556 – 0.600 0.601 – 0.642 0.643 – 0.684 0.685 – 0.725 0.726 – 0.816 0.817 – 0.906
50 55 60 65 70 75 80 85 90 95
0.010 0.011 0.012 0.013 0.014 0.015 0.016 0.017 0.018 0.019 0.020 0.010 0.011 0.012 0.013 0.014 0.015 0.016 0.017
4T 4T 4T 2T 2T 2T 2T 2T 2T 2T 2T 4T 4T 4T 2T 2T 2T 2T 2T
0.040 0.044 0.048 0.026 0.028 0.030 0.032 0.034 0.036 0.038 0.040 0.040 0.044 0.048 0.026 0.028 0.030 0.032 0.034
Double-wall exposure
Double-wall viewing
1.0
50 55 60 65 70 75 80 85
Single-wall viewing (Single- or double-wall exposure)
NOTE: 1/
This penetrameter is to be used for both insert and backing ring joints regardless of the amount of reinforcement or thickness of backing ring. Only MIL-type penetrameter sizes are shown. If ASTM-type penetrameters are used, substitute the corresponding ASTM penetrameter size.
3.5.5.3.4 Penetrameter Orientation. Penetrameters may be placed with the long axis either parallel or perpendicular to the length of the weld. 3.5.5.3.5 Obstructions. When part geometry or access will not permit placement of the penetrameter at one or both extremities, the penetrameter shall be placed within 1 inch of the obstruction. A lead source-side marker shall be placed on the adjacent base material at the extremity of the area to be viewed for acceptance. If access to adjacent base material is restricted, the marker shall be placed on the weld. If the extremity of the area of interest is obvious on the radiograph (that is, the end of a plate, a weld intersection, and so forth), the additional marker is not required.
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