API STD1104, ASME/ANSI B31.4, ASME/ANSI B31.8 Table 3-1 is applicable in determining the size and type of discontinuities when viewing radiographs for final acceptance in accordance with API STD 1104, ASME/ANSI

B31.4, Paragraph 434.8.5, and ASME/ANSI B31.8.

Table 3-1 – Acceptance Criteria for API STD 1104

Indication/Defect Unacceptable if any of the following conditions exist:

Inadequate Penetration (IP) (without high-low)

1. Length of an individual indication of IP exceeds 25.4 mm (1.0").

2. The aggregate length of indications of IP in any continuous 304.8 mm (12") length of weld exceeds 25.4 mm (1.0").

3. The aggregate length of indications of IP exceeds 8% of the weld length in any weld less than 304.8 mm (12") in length.

Inadequate Penetration due to High-Low (IPD)

1. Length of an individual indication of IPD exceeds 50.8 mm (2.0").

2. The aggregate length of indications of IP in any continuous 304.8 mm (12") length of weld exceeds 76.2 mm (3.0").

Incomplete Fusion (IF)

1. Length of an individual indication of IF exceeds 25.4 mm (1.0").

2. The aggregate length of indications of IF in any continuous 304.8 mm (12") length of weld exceeds 25.4 mm (1.0").

3. The aggregate length of indications of IF exceeds 8% of the weld length in any weld less than 304.8 mm (12") in length.

Incomplete Fusion due to Cold Lap (IFD)

1. Length of an individual indication of IFD exceeds 50.8 mm (2.0").

2. The aggregate length of indications of IFD in any continuous 304.8 mm (12") length of weld exceeds 50.8 mm (2.0").

3. The aggregate length of indications of IFD exceeds 8% of the weld length.

Internal Concavity (IC)

Any length of IC is acceptable provided the density of the radiographic image of the IC does not exceed that of the thinnest adjacent base metal. For areas that exceed the density of the thinnest adjacent base metal, the criteria for burn through are applicable.

Burn-Through (BT)

Pipe OD 2-3/8"

1. Maximum dimension exceeds 6.35 mm (¼") and the density of the BT's image exceeds that of the thinnest adjacent base metal

2. Maximum dimension exceeds the thinner of nominal wall thicknesses joined, and the density of the BT's image exceeds that of the thinnest adjacent base metal

3. Sum of maximum dimensions of separate BTs whose image density exceeds that of the thinnest adjacent base metal exceeds 12.7 mm (½") in 304.8 mm (12") of weld or the total weld length, whichever is less.

Pipe OD < 2-3/8"

1. Maximum dimension exceeds 6.35 mm (¼") and the density of the BT's image exceeds that of the thinnest adjacent base metal

2. Maximum dimension exceeds the thinner of nominal wall thicknesses joined, and the density of the BT's image exceeds that of the thinnest adjacent base metal

3. More than one BT of any size is present and the density of more than one of the images exceeds that of the thinnest adjacent base metal.

Table 3-1 – Acceptance Criteria for API STD 1104 (Cont'd)

Indication/Defect Unacceptable if any of the following conditions exist:

Slag Inclusions

Elongated(ESI)

Isolated (ISI)

Note: ESI indications

separated by approx. width of root bead (wagon tracks) to be considered as a single indication unless the width of either > 1/32". In that event, they shall be considered as separate indications.

Pipe OD 2-3/8"

Unacceptable if:

1. ESI length > 2"

2. ESI width > 1/16"

3. Sum of the lengths of ISI > ½" in 12" of weld.

4. Width of ISI > 1/8"

5. > 4 ISI with maximum width of 1/8" in any 12" of weld.

6. Sum of the lengths of ESI & ISI > 8% of weld length.

Pipe OD < 2-3/8"

Unacceptable if:

1. ESI > 3 X nominal WT of the thinner thickness joined.

2. ESI width > 1/16"

3. Sum of ISI lengths > 2 X nominal WT of thinner thickness joined and ISI width > ½ nominal WT of thinner thickness joined.

4. Aggregate length of ESI & ISI > 8% of weld length.

Porosity - individual / Scattered (P)

Note: Size based on

maximum dimensions

Unacceptable if:

1. Size of individual pore > 1/8"

2. Size of individual pore > 25% of thinner WT joined

3. Distribution of Porosity exceeds API STD 1104 Porosity Charts.

Porosity - Cluster (CP)

Unacceptable if:

1. CP dia. > ½"

2. Aggregate length of CP > ½" in any continuous 12" of weld

3. An individual pore within a cluster > 1/16" in size.

Porosity - Hollow-Bead (HB)

Unacceptable if:

1. Length of individual HB > ½"

2. Sum of HB lengths > 2" in any continuous 12" of weld

3. Individual HB > ¼" separated by < 2"

4. Sum of HB lengths > 8% weld length.

Cracks (C) Any size or location of cracks are unacceptable except for shallow crater or star cracks. Shallow crater or star crack length > 5/32" is unacceptable.

Undercutting

Adjacent to cover pass

(EU) Adjacent to root pass

(IU)

Unacceptable if:

1. Any combination EU & IU length > 2" in any continuous 12" of weld.

2. Sum of EU & IU lengths in any combination > 1/6 of weld length.

Tungsten Inclusions Individual tungsten inclusions are be evaluated as rounded indications

(Porosity). Elongated or aligned tungsten inclusions are unacceptable.

Accumulation of Discontinuities Excluding IPD, EU & IU

Unacceptable if:

1. Sum lengths of indications > 2" in any continuous 12" of weld.

2. Sum lengths of indication > 8% of weld length.

Pipe / Fitting Discontinuities Arc burns, long seam discontinuities and other discontinuities in the pipe or fittings detected by RT shall be recordable.