Take note
This overview explains the fitness for service assessment approach in IMS PLSS, which is based on pipeline corrosion defects assessment codes such as DNV RPF-101 and ASME B31G.
The fitness for service assessment, in general, is based on two approaches:
ILI/IP data – standard assessment in the FFS module.
Non-piggable assessment – an assessment that caters to the case where inspection data is not from ILI/IP.
We advice that the technical authority for the Pipeline and subsea asset class should ensure that the fitness for service assessment is:
Conducted for all types of defects and loading conditions above workmanship standards.
Duly record in an appropriate system, or in the element section of IMS PLSS where the assessment is not calculated by IMS PLSS (for age-related degradation with a volumetric morphology and a plastic collapse limit state predominantly under internal pressure using level 1 assessment methods, i.e. a burst of corrosion defects).
The relationship between the generalized workflow and IMS PLSS for the fitness for service assessment is defined in Figure below.
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Generalized workflow and IMS PLSS process/modules: Fitness for service assessment.
In addition to this FFS online manual also refer to PL Non-Piggable Pipelines and PL ILI Comparison.