PEI Corrosion Calcs - Overview

A Circuit covers all Piping- or Equipment-Components where the same Corrosion Rate (CR) is Expected/Measured. This is the place where the NDE examinations are documented. The Circuit contains Condition Measurement locations (CMLs). The CMLs can have one or more Measurement Points (MPs) and this is where the NDE inspections are performed. (See also PEI Hierarchy.)

A Corrosion Schedule is registered for the Circuit and is performed by the radiographic department by doing Wall Thickness (WT) measurements. The inspector dictates which MPs should be measured by creating a Measurement Set (MS). When the Inspector receives the measurements from the radiographic department, he imports it in IMS.

The Inspector can then use the trending module (s-IDAP) to fully analyze and trend the measurements to determine the Corrosion Rates (CRs) and subsequently the worst Remnant Life (RL) and Next Inspection Date (NID) for the Circuit. This information is summarized in the Circuit Calc Summary.

By approving the measurement results, i.e., the Circuit Calc Summary, the Corrosion Schedule of the Circuit is credited and a new NID set.