Generally, you will want to renew TMLs when you replace an asset. For example, if an asset representing a tank is linked to one or more TMLs that have Thickness Measurements, when you replace the tank, you can renew the TMLs to retain the measurement data recorded for the old tank while creating a new base measurement for the new tank. When you do this, you can begin calculating Corrosion Analyses for the new tank.
When you renew a TML:
- In linked Thickness Measurements, if the Measurement Status Indicator field was set to Active prior to the renewal, it will be set to Inactive.
- The value in the Historical Sequence Number field in linked Thickness Measurements that were used during that life cycle will be incremented. For example, if the Historical Sequence Number field previously contained no value, indicating that the associated TML had never been renewed, it will now be 1, indicating that the associated Thickness Measurement Location record has been renewed one time.
- The value in the Renew Historical Sequence Number field of the TML will be populated with the largest Historical Sequence Number in the associated Thickness Measurements that were used during that life cycle. For example, assume there are two associated Thickness Measurements that were used during the life cycle. If the Historical Sequence Number of the first measurement is 1 and that of the second measurement is 2, the Renew Historical Sequence Number field in the TML is populated with the value 2. This will keep track of the life cycle for that TML.
- The value in the Minimum Corrosion Rate field in the Corrosion Analysis Settings for the TML is replaced with the current value in the Controlling Corrosion Rate field in the TML.
- The value in the Status Changed By field in the TML will update to reflect the User ID of the Security User who renewed the TML.
- The value in the Status Changed Date field in the TML will change to the current date.