T9074-AS-GIB-010/271 Rev 1
Table 3-4. Number of Penetrameters and Placement for Welds.
Penetrameters
Inspected Weld Length (Inches)
Weld Configuration 2/
Minimum Number
Placement 1/
Welds in curved surfaces less than 24 inches in diameter.
5 and less
1
At the center of the area of interest. One at the extremity and one at the center of the area of interest, or one at each extremity of the area of interest. At the center of the area of interest. One placed at each extremity of the area of interest. One placed at each extremity and one at the center of the area of interest. Approximately 180 degrees apart at the extremity of the area being inspected.
Greater than 5
2
Welds in flat surfaces and curved surfaces 24 inches and greater in diameter (includes longitudinal welds in pipes and pressure vessels).
Less than 10 10 up to and including 17
1
2
Greater than 17
3
Essentially circular (non cylindrical welds on one film)
Unlimited
2
Cylindrical welds radiographed simultaneously using a series of films or a single length of roll film (panoramic exposure). Repairs in cylindrical welds initially radiographed using panoramic exposure technique.
One in each quadrant.
Unlimited
4
One in each affected quadrant, provided the technique used is the same as the initial radiograph.
Unlimited
1
NOTES: 1/ Penetrameter placement specified for longer inspected weld lengths may be used for shorter weld lengths within each weld configuration. 2/ This table may be utilized for radiography of comparable cast and forged shapes as those listed under the “Weld Configuration” column. 3.7 RADIOGRAPHIC QUALITY LEVELS. Unless otherwise specified in the applicable specification, contract, or drawing, the radiographic quality level shall be 2-2T, except as noted in 3.7.1 and 3.7.2. Penetrameter identification, definition of radiographic quality level, and design are specified in table 3-1, table 3-5, and figures 3-5 and 3-6, respectively. a. Standard radiographic quality level. (1) 2-2T: This requires that a penetrameter whose thickness (T) is no greater than 2 percent ( 1 ⁄ 50 ) of the material thickness of the item being radiographed and a hole drilled through the penetrameter with a diameter equal to twice the thickness of the penetrameter (2T) shall be visible. b. Special radiographic quality levels. (1) Quality level 1-1T radiography: The 1T hole in a penetrameter whose thickness (T) is no greater than 1 percent ( 1 ⁄ 100 ) of the material thickness shall be visible.
3-14
Made with FlippingBook - Share PDF online