Relationship between CLs, Components and Circuits
- 09 Aug 2024
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Relationship between CLs, Components and Circuits
- Updated on 09 Aug 2024
- 2 Minutes to read
- Contributors
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- PDF
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The next figure shows how CLs, Components and Circuits relate to each other.
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Relationship between CLs, Components and Circuits.
Component | Components are the separate parts of an Equipment that have the Barriers against the Threats of the DMs. Thus, they need verification through inspection. The S-RBI risk assessment therefore takes place on this level, i.e. each Component – DM combination is assessed. A Component must first be linked to a CL before applicable DMs (defined for the CL) can be assigned to the Component. |
Corrosion Loop | A CL is a Group of Components where Degradation is Managed in the same way. On this level DMs, Barriers are defined. The CL can be linked to multiple IOWs. |
Circuit | A Circuit covers all Piping- or Equipment-Components where the same Corrosion Rate (CR) is Expected/Measured. This is the level on which Wall Thickness (WT) measurements are inputted, and CR calculations take place. Components and Circuits can be set to be inherit. This way the Component can inherit the CR information (SCR and RCA) from the Circuit. In turn the Circuit can inherit the RBI Interval Factor (IF), which will influence the Corrosion Schedule’s Next Inspection Date (NID). When inherit, the Circuit will also be linked to the Component’s CL. |
Take Note:
- A Component can have multiple Circuits, for example if:
- There is a water/hydrocarbon or liquid/gas interface (e.g., vessel water boot); or
- Turbulent areas or small bores on the same Component have a higher expected CR for the same Degradation Mechanism.
- A Circuit may also cover multiple Components when one single CR is expected in all Components.
Inheritance between Circuits and Components (CR, RCA, IF)
A Component and a Circuit can be set up to be inherit. In this way the Component inherits the Circuit specs as well as the CR and RCA, while the Circuit inherits the Component’s IF. Also, the Circuit will automatically be linked to the CL to which the Component was added.
The inheritance can be set from either the Circuit Details Page or the Component Details Page. This is done in Step 1 of the Degradation Management workflow.
Corrosion Rate (CR) & Remaining Corrosion Allowance (RCA)
A Component can inherit the Actual CR and RCA from a corresponding Circuit. In this way the Circuit’s CR and RCA can be used in the RL estimate for the S-RBI Analysis ( Step 6 of the Degradation Management workflow). The Circuit’s calculated CR can thus influence the RBI IF calculation and in turn the NID. Note: Also, when the Circuit's Calc Summary is Approved it will automatically be applied to the RBI Analysis Inspection History. This will update the RBI Last Inspection Date (LID). For further explanation see Step 5 of the Degradation Management workflow.
Additionally, the CR of the Component’s inherit Circuit will serve as an indicator for Barrier status (for the Component’s linked CL).
Interval Factor (IF)
The Circuit can also inherit the IF from the corresponding RBI Component. In this way the Corrosion Schedule’s NID can be based on the RBI IF.
For the Circuit to use the RBI IF, the Circuit's IF Strategy must be set to "SRBI". The linked Component should, in this case, be analyzed for at least one AR DM. When there is no SRBI IF the Circuit will default to the IMS IF.
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