DNV GL has updated recommended practices for corroded pipelines and for integrity management of submarine pipeline systems.
The update to DNV-RP F101, dealing with corroded pipelines, includes new methods for estimating pressure resistance of a pipeline containing long axial grooving and for assessing internal corrosion development with time. The pressure-resistance estimation methodology is applicable to pipelines with other patterns of internal corrosion, DNV GL said.
Other updates enhance compliance with the newest edition of the offshore standard DNV-OS-F101 rev. 2013-10 in areas such as pressure definitions and terminology, characteristic material properties, partial safety factors and fractile values, and supplementary material requirements.
The revision of DNV-RP-F116, covering offshore pipeline integrity management, provides more-comprehensive guidelines for carrying out risk assessments. Also revised are guidelines for integrity management reviews and recommendations for identifying key performance indicators.