Geometry
This geometric defect occurs when a pipe’s cross-section becomes out of round.
What is Ovality?
This cracking type occurs perpendicular to the pipe’s axis and is affected by tensile stress and coating failure.
What is CSCC (Circumferential Stress Corrosion Cracking)?
This burst pressure calculation method assumes corrosion is rectangular and conservatively predicts failure pressure.
What is Modified B31G?
This term describes non-metallic materials embedded in welds, often left over from slag.
What is Inclusion?
This temporary repair is bolted on.
What is a Plidco?
This geometric defect results in a sharp inward bend resembling a folded straw.
What is a Kink?
This cracking type develops hours or days after welding, often from trapped hydrogen.
What is Delayed Cracking?
This inline inspection tool specializes in metal loss defects.
What is Magnetic Flux Leakage?
This defect refers to a surface imperfection or defect characterized by a rough, irregular, raised patches or flakes on the external surface of the pipe.
What is a Scab?
The second number in a Type-A Compression sleeve serial number (ex: 12-359-24-1097).
What is Pipe Grade?
This type of defect is a raised portion of the pipe surface due to internal pressure.
What is a Bulge?
This term describes multiple cracks merging into one another.
What is Interlinking?
When calculating remaining strength using API 579, these two defect measurements are used.
What is Depth and Width?
Atco Pipelines requires a 120 grit flapper disc to be used (and a defect repair report be completed) to repair this defect type.
What is an Arc Burn? (Arc Strike)
This is the maximum depth for grind repairs, unless approved by client engineering and Tilt management.
What is 40%?
This term refers to the peak-to-peak measurement.
What is wavelength?
This cracking type is caused by repeated loading even below yield strength.
What is Fatigue Cracking?
Atco Pipelines uses this interaction method when assessing corrosion.
What is Fit to Shape?
The height and depth of a defect that extends from the OD surface 1.4mm to 2.7mm on a 5.6mm thick ERW.
What is a height of 1.3mm and a depth of 2.7mm?
The acceptance requirements for installed Type-B containment sleeves.
What is CSA Z662.23 (7.2.5) & ASME B31.3N?
The code that provides a strain-based method for assessing dent defects.
What is ASME B31.8R?
This weld defect appears at the point of deepest penetration between welds.
What is a Root Crack?
Critical defects are any defect with a predicted burst pressure less than 110% or a depth of this percentage.
What is 70%?
CSA Z662 states that in a girth weld this surface breaking defect type shall not exceed 12mm in length or 25mm in any 300mm cumulative section.
What is Lack of Fusion?
The repair type for perfectly clean pipe.
What is a Recoat?