Mandatory Appendix 4 Rounded Indications Charts Acceptance Standard for Radiographically Determined Rounded Indications in Welds
This Acceptance Criteria is Based and Reference of ASME BPVC VIII, 1-2023 Page No- 363.4-1 Applicability of These Standards
This standard are applicable to ferritic, austenitic, and nonferrous materials.| Table 4-1 | |||
|---|---|---|---|
| Customary Units | |||
| Thickness, t, in | Maximum Size of Acceptable Rounded Indication, in | Maximum Size of Nonrelevant Indication, in | |
| Random | Isolated | ||
| Less than 1/8 | 1/4 t | 1/3 t | 1/10 t |
| 1/8 | 0.031 | 0.042 | 0.015 |
| 3/16 | 0.047 | 0.063 | 0.015 |
| 1/4 | 0.063 | 0.083 | 0.015 |
| 5/16 | 0.078 | 0.104 | 0.031 |
| 3/8 | 0.091 | 0.125 | 0.031 |
| 7/16 | 0.109 | 0.146 | 0.031 |
| 1/2 | 0.125 | 0.168 | 0.031 |
| 9/16 | 0.142 | 0.188 | 0.031 |
| 5/8 | 0.156 | 0.210 | 0.031 |
| 11/16 | 0.156 | 0.230 | 0.031 |
| 3/4 to 2, incl. | 0.156 | 0.250 | 0.031 |
| Over 2 | 0.156 | 0.375 | 0.063 |
| SI Units | |||
| Thickness, t, mm | Maximum Size of Acceptable Rounded Indication, mm | Maximum Size of Nonrelevant Indication, mm | |
| Random | Isolated | ||
| Less than 3 | 1/4 t | 1/3 t | 1/10 t |
| 3 | 0.79 | 1.07 | 0.38 |
| 5 | 1.19 | 1.60 | 0.38 |
| 6 | 1.60 | 2.11 | 0.38 |
| 8 | 1.98 | 2.64 | 0.79 |
| 10 | 2.31 | 3.18 | 0.79 |
| 11 | 2.77 | 3.71 | 0.79 |
| 13 | 3.18 | 4.27 | 0.79 |
| 14 | 3.61 | 4.78 | 0.79 |
| 16 | 3.96 | 5.33 | 0.79 |
| 17 | 3.96 | 5.84 | 0.79 |
| 19.0 to 50, incl. | 3.96 | 6.35 | 0.79 |
| Over 50 | 3.96 | 9.53 | 1.60 |
| GENERAL, NOTE: This Table contains example only. | |||
4-2 Terminology
(a) Rounded Indications. Indications with a maximum length of three times the width or less on the radiograph are defined as rounded indications, These indications may be circular, elliptical, conical, or irregular in shape and may have tails. When evaluating the size of an indication, the tail shall be included. The indication may be from any imperfection in the weld, such as porosity, slag, or tungsten.
(b) Aligned Indications. A sequence of four or more rounded indications shall be considered to be aligned when they touch a line parallel to the length of the weld drawn through the center of the two outer rounded indications.
(c) Thickness t. t is the thickness of the weld, excluding any allowable reinforcement. For a butt weld joining two members having different thicknesses at the weld, t is the thinner of these two thicknesses. If a full penetration weld includes a fillet weld, the thickness of the throat of the fillet shall be included in t.
4-3 Acceptance Criteria
(a) Image Density. Density within the image of the indication may vary and is not a criterion for acceptance or rejection.
(b) Relevant Indications. (See Table 4-1 for examples.) Only those rounded indications which exceed the following dimensions shall be considered relevant.
(1) 1/10 t for t less than 1/8 in. (3 mm)
(2) 1/64 in. for t from 1/8 in. to 1/4 in. (3 mm to 6 mm), incl.
(3) 1/32 in, for t greater than 1/4 in. to 2 in. (6 mm to 50 mm), incl.
(4) 1/16 in, for t greater than 2 in. (50 mm)
(c) Maximum Size of Rounded Indication. (See Table 4-1 for examples.) The maximum permissible size of any indication shall be 1/4 t, or 5/32 in. (4 mm), whichever is smaller; except that an isolated indication separated from an adjacent indication by 1 in. (25 mm) or more may be 1/3 t, or 1/4 in. (6 mm), whichever is less. For t greater than 2 in. (50 mm) the maximum permissible size of an isolated indication shall be increased to 3/8 in. (10 mm).