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Acceptance Standards for Non-Destructive testing

API 1104 • • •

The length of an individual indication of IP exceeds 25 mm The aggregate length of indications of IP in any continuous 300 mm length of weld exceeds 25 mm The aggregate length of IP exceeds 8% of the weld length in welds less than 300 mm in length

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The length of an individual indication of IPD exceeds 50 mm

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The aggregate length of IPD indications exceed 75 mm in a 300 mm length of weld

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The length of an individual indication of ICP exceeds 50 mm

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The aggregate length of indications of ICP exceeds 50 mm in a length of 300 mm of weld

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The length of an individual indication of IF exceeds 25 mm The aggregate length of indications of IF exceeds 25 mm in a length of 300 mm of weld The aggregate length of IF exceeds 8% of the weld length in welds less than 300 mm in length

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The length of an individual indication of IFD exceeds 50 mm The aggregate length of indications of IFD exceeds 50 mm in a 300 mm length of weld The aggregate length of IFD exceeds 8% of the weld length

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Burn Through

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Any length of internal concavity is acceptable provided the density of the radiographic image is not greater than that of the thinnest adjacent parent material

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For areas which exceed the density of the thinnest adjacent parent material the criteria for burn through will apply.

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The maximum dimension exceeds 6 mm and the density of the BT image exceeds that of the thinnest adjacent parent material The maximum dimension exceeds the thinner of the nominal wall thicknesses joined, and the density of the BT image exceeds that of the thinnest adjacent parent material

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Slag Inclusions

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A slag inclusion is defined as a non-metallic solid entrapped in the weld metal or between the weld metal and the parent material Elongated slag inclusions ESI Continuous or broken slag lines or wagon tracksfound in fusion zones ISI Isolated slag inclusions are of irregular shape and may be found anywhere in the weld

• • ESI Slag Inclusions •

• ISI Slag Inclusions

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• Porosity •

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The length of an ESI exceeds 50 mm The aggregate length of indications of ESI exceeds 50 mm in a 300 mm length of weld The width of an ESI exceeds 1.6 mm The aggregate length of the ISI in any continuous length of 300 mm of weld exceeds 13 mm. The width of an ISI indication exceeds 3 mm More than 4 ISI indications with a maximum width of 3 mm in a length of 300 mm of weld The aggregate length of ESI and ISI indications exceeds 8% of weld length Porosity is defined as gas trapped by solidifying weld metal before the gas has a chance to raise to the surface of the molten puddle and escape. Porosity is generally spherical but may be elongated or irregular shape such as piping or worm hole porosity The size of a pore is measured by its maximum dimension The size of an individual pore exceeds 3 mm The size of an individual pore exceeds 25% of the nominal wall thickness joined The distribution of scattered porosity exceeds the concentration permitted in Fig 19

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Cluster porosity CP that occurs in any pass except the finish pass shall comply with the criteria of the previous slide.

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CP that occurs in the finish pass shall be considered a defect should any of the following conditions exist:

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The diameter of a cluster exceeds 13 mm The aggregate length of CP exceeds. 13 mm in a 300 mm length of weld An individual pore within the cluster exceeds 2 mm in size.

Cluster Porosity

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• • Hollow Bead Porosity • • •

• • Cracks •

HB is defned as elongated porosity that occurs in the root pass: The length of an individual indication exceeds 13 mm The aggregate length of HB exceeds. 50 mm in a 300 mm length of weld Individual indications of HB that exceed 6 mm are separated by less than 50 mm The aggregate length of all indications of HB exceeds 8% of weld length Cracks C shall be considered a defect: A crack (C) of any size or location in a weld is NOT a shallow crater or star crack A crater or star crack that exceeds 4 mm

( crater cracks are a result of weld metal contractions during solidification)

• • Undercutting •

• • Accumulation of imperfections •

Undercutting is a groove melted into the parent metal adjacent to the weld and left unfilled by weld metal Undercutting adjacent to the cover pass EU and adjacent to the root pass IU The aggregate length of EU and IU in any combination in any continuous 300 mm length of weld exceeds 50 mm or 1/6th of weld length Excluding incomplete penetration due –low and undercutting (AI) shall be considered a defect: The aggregate length of indications in any continuous 300 mm length of weld exceeds 50 mm The aggregate length of indications exceed 8% of weld length