Inadequate penetration (IP) due to high-low is considered unacceptable when the aggregate length of indications exceeds what in any continuous 12" length of weld?

Inadequate penetration due to high-low conditions in welds can lead to significant weaknesses in pipeline integrity, and it's vital to adhere to established standards for acceptability. According to API 1104, the criteria for determining unacceptable levels of inadequate penetration, particularly when assessing indications over a continuous length of the weld, are clearly defined.

When the aggregate length of indications exceeds 2 inches in any continuous 12-inch length of weld, this condition is viewed as unacceptable. This threshold is established to ensure that the integrity and strength of the weld meet necessary safety criteria and performance expectations. If the indications surpass this limit, it may indicate a failure in the welding process that could compromise the pipeline's performance.

Understanding these thresholds helps ensure compliance with industry standards, emphasizing the importance of achieving proper penetration to maintain the strength and reliability of welded joints in pipeline construction and maintenance.