API 1104 : RT and Visual Inspection Acceptance Criteria
API 1104 : RT and Visual Inspection Acceptance Criteria
API 1104 Section 9 acceptance standards presented apply to imperfections located by radiographic, magnetic particle, liquid penetrant, and ultrasonic test methods and also be applied to visual inspection. Nondestructive testing shall not be used to select welds that are subjected to destructive testing.
Below Visual Inspection Acceptance Criteria as per API 1104 :
# The crack, of any size or location in the weld, is not a shallow crater crack or star crack shall be rejected. The crack is a shallow crater crack or star crack with a length that exceeds 5/32 in. (4 mm) also rejected.
# Undercutting adjacent to the cover or root bead shall not exceed the dimensions given in Table 4(Maximum Dimension of Undercutting) and Section 9.3.11
# Inadequate Penetration (detail see Section 9.3.1 , 9.3.2, 9.3.3 and figure 13) can’t exceed 1 inch.
# Incomplete Fusion shall be considered a defect should any of the following conditions exist:
a. The length of an individual indication of IF exceeds 1 in.(25 mm).
b. The aggregate length of indications of IF in any continuous 12-in. (300 mm) length of weld exceeds 1 in. (25 mm).
c. The aggregate length of indications of IF exceeds 8% of the weld length in any weld less than 12 in. (300 mm) in length.
And fore more Incomplete Fusion can see on Section 9.3.5 (figure 17)
# Internal Concavity (Any length of internal concavity is acceptable, provided the density of the radiographic image of the internal concavity does not exceed that of the thinnest adjacent parent material. For areas that exceed the density of
the thinnest adjacent parent material, the criteria for burn-through (see 9.3.7) are applicable) more detailed see Figure 18.
# Burn-Through (The maximum dimension exceeds 1/4 in. (6 mm) and the density of the BT’s image exceeds that of the thinnest adjacent parent material) more detailed see Section 9.3.7.1, 9.3.7.2, 9.3.7.3 .
# Slag Inclusions (when the size of a radiographic indication of slag is measured, the indication’s maximum dimension shall be considered its length) more detailed see Section 9.3.8.1, 9.3.8.2, 9.3.8.3)
# Porosity (The size of an individual pore exceeds 1/8 in. (3 mm)) more detailed conditions see Section 9.3.9.2 until 9.3.9.4 and Figure 19 or 20.
# Excluding incomplete penetration due to high-low and undercutting, any accumulation of imperfections (AI) shall be
considered a defect should any of the following conditions exist:
a. The aggregate length of indications in any continuous 12-in. (300-mm) length of weld exceeds 2 in. (50 mm).
b. The aggregate length of indications exceeds 8% of the weld length.
by online welding courses – non destructive testing
Why is it that this criteria didn't talk about ( Execce penetration )
Thanks for sharing this material!
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