Thickness Monitoring Analyses, Corrosion Analysis Settings, and Tasks

The following tables provide lists of various fields that are defined for the Asset Corrosion Analysis, TML Corrosion Analysis, and Corrosion Analysis Settings families in the baseline GE Digital APM database. Depending on how your system has been configured, additional fields may be available in the families, and some fields may not behave exactly as described in the table.

Note: Although the fields are listed in alphabetical order in the tables, they will appear in a different order in the application. This list is not comprehensive. Baseline fields that are not displayed in the application are omitted. Certain datasheets may be divided into tabs.

The following families are enabled for site filtering, which means that the records in these families can be assigned to a specific site, and will then only be accessible to users who are assigned to the same site and have the appropriate license and family privileges. See the for more information on using this feature.

Asset Corrosion Analysis

Each Asset Corrosion Analysis contains read-only fields that store calculations and summary information. This data is derived from the TML Corrosion Analyses that are linked to the TMLs for the asset or TML Group. The following table provides an alphabetical list of the fields that are visible on the tabs of an Asset Corrosion Analysis datasheet.

Field	Data Type	Description	Behavior and Usage
Analysis ID	Character	Identifies the Asset Corrosion Analysis.	Always disabled. The Analysis ID is created automatically, and consists of the ID from the related asset or TML Group, the Analysis Type, and the text Corrosion Analysis.
Analysis Required	Boolean	When selected, indicates that data has changed such that the analysis must be recalculated.	Always disabled. The check box in this field is selected automatically by Thickness Monitoring. It is cleared when the analysis is calculated.
Asset Calc Adjusted Next Insp Date	Date	Specifies the date of the next required inspection of the asset or TML Group, based on the Asset Average Corrosion Rate.	Always disabled. This field is populated with the most conservative (i.e., earliest) date from the Asset Average Corrosion Rate Next Inspection Date fields in the TML Corrosion Analyses linked to the analysis. This field is populated only if the Controlling Corrosion Rate setting in the related Corrosion Analysis Settings has been set to Average or Formula, and the Apply CCR to TML Rem Life Next Insp Date Calc check box was selected at the same time.
Asset Calc Adjusted Remaining Life	Numeric	Specifies the remaining life of the asset or TML Group, based on the Asset Average Corrosion Rate.	Always disabled. This field is populated with the most conservative (i.e., lowest) value from the Asset Average Corrosion Rate Remaining Life fields in the TML Corrosion Analyses linked to the analysis. This field is populated only if the Controlling Corrosion Rate setting in the related Corrosion Analysis Settings has been set to Average or Formula, and the Apply CCR to TML Rem Life Next Insp Date Calc check box was selected at the same time.
Asset Calc Adjusted Retire Date	Date	Specifies the recommended retirement date for the asset or TML Group, based on the Asset Average Corrosion Rate.	Always disabled. This field is populated with the most conservative (i.e., earliest) date from the Asset Average Corrosion Rate Retirement Date fields in the TML Corrosion Analyses linked to the analysis. This field is populated only if the Controlling Corrosion Rate setting in the related Corrosion Analysis Settings has been set to Average or Formula, and the Apply CCR to TML Rem Life Next Insp Date Calc check box was selected at the same time.
Asset Calculated Next Insp Date	Date	Specifies the date of the next required inspection of the asset or TML Group.	Always disabled. This field is populated with the most conservative (i.e., earliest) date from the Scheduled Next Inspection Date fields in the TML Corrosion Analyses linked to the analysis.
Asset Calculated Remaining Life	Numeric	Specifies the remaining life of the asset or TML Group.	Always disabled. This field is populated with the most conservative (i.e., lowest) value from the Remaining Life fields in the TML Corrosion Analyses linked to the analysis.
Asset Calculated Retire Date	Date	Specifies the recommended retirement date for the asset or TML Group.	Always disabled. This field is populated with the most conservative (i.e., earliest) date from the Retirement Date fields in the TMLs linked to the analysis.
Average Corrosion Rate	Numeric	Specifies the average rate at which the asset or TML Group is corroding.	Always disabled. By default, this field is calculated by taking the sum of the Corrosion Rates for all TML Corrosion Analyses linked to the analysis, and dividing it by the number of linked TMLs. The value in this field may change based on the following options in the related Corrosion Analysis Settings: Safety Factor Minimum Number of TMLs Percentile
Average Corrosion Rate Standard Deviation	Number	Numeric	None.
Average Corrosion Rate TML's Used	Text	Stores a list of TMLs that were used for calculating the Average Corrosion Rate for the Asset Corrosion Analysis.	Always disabled. This list is used to construct the Based on list of TMLs that appear as links in the Summary section of the Analysis Output workspace for the asset or TML Group.
Controlling Corrosion Rate	Numeric	Specifies the corrosion rate of the asset or TML Group.	Always disabled. This field is determined using the corrosion rates that exist for the TMLs linked to the analysis, and the Controlling Corrosion Rate option (Average, Formula, or Maximum) selected in the related Corrosion Analysis Settings.
Corrosion Inspection Type	Character	Specifies the type of inspection (UT, RT, or TML) for the Asset Corrosion Analysis.	Always disabled. This field is populated automatically based on the related Corrosion Analysis Settings. Only data from linked TML Corrosion Analyses with a Corrosion Inspection Type that matches this field will be used with this analysis.
Estimated Remaining Life	Numeric	Specifies the remaining life of the asset or TML Group.	Always disabled. In the related Corrosion Analysis Settings, if the Apply CCR to TML Rem Life Next Insp Date Calc check box is selected, this field is populated with the value in the Asset Calc Adjusted Remaining Life field. Otherwise, this field is populated with the value in the Asset Calculated Remaining Life field.
Last Date / Time Analysis Calculated	Date	Specifies the date and time when the analysis was last calculated.	Always disabled. This field is populated automatically when the analysis is calculated.
Maximum Allowable Working Pressure	Numeric	Specifies the Maximum Allowable Working Pressure for the asset or TML Group.	Always disabled. This field is populated with the most conservative (i.e., lowest) value from the Maximum Allowable Working Pressure fields in the TML Corrosion Analyses linked to the analysis.
Maximum Corrosion Rate	Numeric	Specifies the highest rate at which the asset or TML Group is corroding.	Always disabled. This field is populated with the highest rate from the Corrosion Rate fields in the TML Corrosion Analyses linked to the analysis.
Maximum Historical Corrosion Rate	Numeric	Specifies the highest corrosion rate that has ever been calculated for any TML that is linked to analysis.	Always disabled. When the analysis is recalculated, this field is only updated if the value in the Controlling Corrosion Rate field for any TML Corrosion Analysis linked to the analysis exceeds the current value of this field. If the value in this field is exceeded by the Controlling Corrosion Rate from multiple TML Corrosion Analyses, only the highest value is used to populate this field.
Projected T-min Date	Date	Specifies the recommended retirement date for the asset or TML Group.	Always disabled. In the related Corrosion Analysis Settings, if the Apply CCR to TML Rem Life Next Insp Date Calc check box is selected, this field is populated with the value in the Asset Calc Adjusted Retire Date field. Otherwise, this field is populated with the value in the Asset Calculated Retire Date field.
Scheduled Next Date Asset	Date	Specifies the date of the next required inspection of the asset or TML Group.	Always disabled. In the related Corrosion Analysis Settings, if the Apply CCR to TML Rem Life Next Insp Date Calc check box is selected, this field is populated with the value in the Asset Calc Adjusted Next Insp Date field. Otherwise, this field is populated with the value in the Asset Calculated Next Insp Date field.
Statistical Corrosion Rate	Numeric	Specifies an average corrosion rate that is calculated after eliminating certain TMLs that are identified as statistical outliers.	Always disabled. This field is calculated by performing a statistical analysis of the Corrosion Rates for all TML Corrosion Analyses linked to the analysis.
Statistical Corrosion Rate TMLs Used	Text	Stores a list of TMLs that were used for calculating the Statistical Corrosion Rate for the Asset Corrosion Analysis.	Always disabled.

TML Corrosion Analysis

For each TML linked to an asset or TML Group, a TML Corrosion Analysis is created. Fields in the TML Corrosion Analysis are read-only and are updated based on calculations for the TML and any related Thickness Measurements. The following table provides an alphabetical list of the fields that are visible on the TML Corrosion Analysis datasheet.

Field	Data Type	Description	Behavior and Usage
Allowable Measurement Variance Applied	Boolean	When selected, indicates that the Allowable Measurement Variance has been used to determine the Short Term Corrosion Rate.	Always disabled. The check box in this field is selected automatically if the Allowable Measurement Variance has been used to calculate the value in the Short Term Corrosion Rate field.
Analysis ID	Character	Identifies the TML Corrosion Analysis.	Always disabled. The Analysis ID is created automatically, and consists of the ID of the TML, the Corrosion Inspection Type, and the text Corrosion Analysis.
Analysis Required	Boolean	When selected, indicates that data has changed such that the analysis must be recalculated.	Always disabled. The check box in this field is selected automatically by Thickness Monitoring. It is cleared when the analysis is calculated.
Asset Average Corrosion Rate	Numeric	Specifies the average corrosion rate for the asset or TML Group, calculated using the Controlling Corrosion Rate from all linked TML Corrosion Analyses.	Always disabled. This field is populated only if the Controlling Corrosion Rate setting in the related Corrosion Analysis Settings has been set to Average or Formula, and the Apply CCR to TML Rem Life Next Insp Date Calc check box was selected at the same time.
Asset Average Corrosion Rate Next Inspection Date	Date	Specifies the date of the next required inspection, based on the Asset Average Corrosion Rate Remaining Life.	Always disabled. This field is populated only if the Controlling Corrosion Rate setting in the related Corrosion Analysis Settings has been set to Average or Formula, and the Apply CCR to TML Rem Life Next Insp Date Calc check box was selected at the same time.
Asset Average Corrosion Rate Remaining Life	Numeric	Specifies the remaining life for the TML, based on the Asset Average Corrosion Rate.	Always disabled. This field is populated only if the Controlling Corrosion Rate setting in the related Corrosion Analysis Settings has been set to Average or Formula, and the Apply CCR to TML Rem Life Next Insp Date Calc check box was selected at the same time.
Asset Average Corrosion Rate Retirement Date	Date	Specifies the recommended retirement date for the TML, based on the Asset Average Corrosion Rate Remaining Life.	Always disabled. This field is populated only if the Controlling Corrosion Rate setting in the related Corrosion Analysis Settings has been set to Average or Formula, and the Apply CCR to TML Rem Life Next Insp Date Calc check box was selected at the same time.
Base Measurement Date	Date	Specifies the date the Thickness Measurement used for the Base Measurement Value was taken.	Always disabled. If the Base Measurement Value field is populated, this field is populated with the Measurement Taken Date for the Thickness Measurement used as the Base Measurement.
Base Measurement Value	Numeric	Specifies the value of the Thickness Measurement that was recorded first based on the value in the Measurement Taken Date field.	Always disabled. This field is populated when at least one Thickness Measurement has been recorded for the TML.
Corrosion Inspection Type	Character	Specifies the type of inspection (UT, RT, or TML) for the TML Corrosion Analysis.	Always disabled. This field is populated automatically based on the related Corrosion Analysis Settings.
Corrosion Rate	Numeric	Specifies the maximum corrosion rate of the calculated corrosion rates selected in the related Corrosion Analysis Settings.	Always disabled. This field is populated with the value of the highest calculated corrosion rate. Only the corrosion rates selected in the asset Corrosion Analysis Settings are calculated. In the Analysis Output section of the Analysis Overview workspace for a TML, this corresponds to the Controlling Corrosion Rate. If Thickness Measurements are not available and corrosion rates cannot be calculated, this field will be populated with the Minimum Corrosion Rate defined in the related Corrosion Analysis Settings.
Custom Calculation A Corrosion Rate	Numeric	Specifies the corrosion rate determined by custom corrosion rate A, as defined in the TM Admin Preferences.	Always disabled. The values in this table correspond to the baseline field and datasheet captions that exist for these fields. These captions are not dynamic based upon the label specified for the corrosion rates in the application settings. If you want these captions to match the custom labels that you have defined for these calculations, you will need to customize the captions via the Configuration Manager application.
Custom Calculation A Loss	Numeric	Specifies the amount of corroded material calculated by custom corrosion rate A, as defined in the TM Admin Preferences.	Always disabled. The values in this table correspond to the baseline field and datasheet captions that exist for these fields. These captions are not dynamic based upon the label specified for the corrosion rates in the application settings. If you want these captions to match the custom labels that you have defined for these calculations, you will need to customize the captions via the Configuration Manager application.
Custom Calculation B Corrosion Rate	Numeric	Specifies the corrosion rate determined by custom corrosion rate B, as defined in the application settings.	Always disabled. The values in this table correspond to the baseline field and datasheet captions that exist for these fields. These captions are not dynamic based upon the label specified for the corrosion rates in the application settings. If you want these captions to match the custom labels that you have defined for these calculations, you will need to customize the captions via the Configuration Manager application.
Custom Calculation B Loss	Numeric	Specifies the amount of corroded material calculated by custom corrosion rate B, as defined in the application settings.	Always disabled. The values in this table correspond to the baseline field and datasheet captions that exist for these fields. These captions are not dynamic based upon the label specified for the corrosion rates in the application settings. If you want these captions to match the custom labels that you have defined for these calculations, you will need to customize the captions via the Configuration Manager application.
Custom Rate A Retirement Date	Date	Specifies the recommended retirement date for the TML, based on custom corrosion rate A.	Always disabled. This field is determined using the value in the Custom Calculation A Corrosion Rate field.
Custom Rate B Retirement Date	Date	Specifies the recommended retirement date for the TML, based on custom corrosion rate B.	Always disabled. This field is determined using the value in the Custom Calculation B Corrosion Rate field.
Factor Remaining Life Date	Date	Specifies a date based on the Remaining Life Factor in the related Corrosion Analysis Settings.	Always disabled. When the associated TML is below T-Min, this field is populated with the value in the Last Measurement Date field. When the associated TML is not below T-Min, a calculation is used to determine the date with which this field is populated.
Interval Next Inspection Date	Date	Specifies the date of the next required inspection for the TML.	Always disabled. This field is populated with a date based on the Default Inspection Interval in the related Corrosion Analysis Settings.
Last Measurement Date	Date	Specifies the date the Thickness Measurement used for the Last Measurement Value was taken.	Always disabled. If the Last Measurement Value field is populated, this field is populated with the Measurement Taken Date for the Thickness Measurement used as the Last Measurement.
Last Measurement Value	Numeric	Specifies the value of the Thickness Measurement that was recorded last based on the value in the Measurement Taken Date field.	Always disabled. This field is populated when at least two Thickness Measurements have been recorded for the TML.
Least Squares Corrosion Rate	Numeric	Specifies a value that represents the corrosion rate that was determined using the Least Squares linear regression method. Note: The Least Squares method plots the thickness measurements for the TML and then draws a line that minimizes the sum of the squares of the offsets of the datapoints. The Least Squares Corrosion Rate represents the slope of the line on the plot.	Always disabled. This field is populated only if the Least Squares option for the Corrosion Rate Options setting is selected in the related Corrosion Analysis Settings.
Least Squares Retirement Date	Date	Specifies the recommended retirement date for the TML, based on the Least Squares Corrosion Rate.	Always disabled. This field is populated only if the Least Squares option for the Corrosion Rate Options setting is selected in the related Corrosion Analysis Settings.
Long Term Corrosion Rate	Numeric	Specifies a value that represents the corrosion rate over the time between the first and last measurements.	Always disabled. The rate of corrosion between the Base Measurement Value and the Last Measurement Value is calculated using the following equation: Long Term Corrosion Rate = Long Term Loss / Long Term Interval This field is populated only if the Long Term option for the Corrosion Rate Options setting is selected in the related Corrosion Analysis Settings.
Long Term Loss	Numeric	Specifies the amount of material that was corroded over the time between the first and last measurements.	Always disabled. The amount of material corroded between the Base Measurement Value and the Last Measurement Value is calculated using the following equation: Long Term Loss = Base Measurement Value - Last Measurement Value This field is populated only if the Long Term option for the Corrosion Rate Options setting is selected in the related Corrosion Analysis Settings.
Long Term Retirement Date	Date	Specifies the recommended retirement date for the TML, based on the Long Term Corrosion Rate.	Always disabled. This field is populated only if the Long Term option for the Corrosion Rate Options setting is selected in the related Corrosion Analysis Settings.
Maximum Allowable Working Pressure	Numeric	Specifies the maximum pressure at which the associated asset is designed to operate.	Always disabled. This field is populated only if the TML contains the data necessary to perform the calculation, and only for assets or TML Groups that represent pipes or components that make up pipes.
Maximum Historical Corrosion Rate	Numeric	Specifies the highest corrosion rate calculated during the life of the TML. The Maximum Historical Corrosion Rate may come from any of the calculated corrosion rates.	Always disabled. When the analysis is recalculated, this field is only updated if one of the calculated corrosion rates that is selected in the related Corrosion Analysis Settings exceeds the current value in this field.
Minimum Corrosion Rate Used	Boolean	When selected, indicates the value in the Corrosion Rate field has been set to the Minimum Corrosion Rate value defined in the related Corrosion Analysis Settings.	Always disabled. The check box in this field is selected automatically when the Minimum Corrosion Rate value is used to populate the Corrosion Rate field.
Near Measurement Date	Date	Specifies the date the Thickness Measurement used for the Near Measurement Value was taken.	Always disabled. If the Near Measurement Value field is populated, this field is populated with the Measurement Taken Date for the Thickness Measurement used as the Near Measurement.
Near Measurement Value	Numeric	Specifies the value of the Thickness Measurement that was recorded next-to-last based on the value in the Measurement Taken Date field.	Always disabled. This field is populated when at least two Thickness Measurements have been recorded for the TML.
Projected T-min Date	Date	Specifies the date when the TML will reach its minimum thickness.	Always disabled. This field is calculated using the current rate of corrosion and the T-Min value for the TML.
Remaining Life	Numeric	Specifies in the months the remaining life of the TML after the date of the last measurement recorded.	Always disabled. This field is calculated using the current rate of corrosion and the T-Min value for the TML.
Scheduled Next Inspection Date	Date	Specifies the date of the next suggested inspection of the TML.	Always disabled. If both the Interval Next Inspection Date and Factor Remaining Life Date fields are populated, this field will be populated with the most conservative (i.e., earliest) of the two dates. If only the Interval Next Inspection Date or Factor Remaining Life field is populated, this field will be populated with the date from that field. If neither the Interval Next Inspection Date or Factor Remaining Life fields are populated, this field will be populated with the date from the Projected T-Min Date field.
Short Term Corrosion Rate	Numeric	Specifies a value that represents the corrosion rate over the time between the next-to-last and last measurements.	Always disabled. The rate of corrosion between the Near Measurement Value and the Last Measurement Value is calculated using the equation: Short Term Corrosion Rate = Short Term Loss / Short Term Interval This field is populated only if the Short Term option for the Corrosion Rate Options setting is selected in the related Corrosion Analysis Settings.
Short Term Loss	Numeric	Specifies the amount of material that was corroded over the time between the next-to-last and last measurements.	Always disabled. The amount of material that is corroded between the Near Measurement Value and the Last Measurement Value is calculated using the following equation: Short Term Loss = Near Measurement Value - Last Measurement Value This field is populated only if the Short Term option for the Corrosion Rate Options setting is selected in the related Corrosion Analysis Settings.
Short Term Retirement Date	Date	Specifies the recommended retirement date for the TML, based on the Short Term Corrosion Rate.	Always disabled. This field is populated only if the Short Term option for the Corrosion Rate Options setting is selected in the related Corrosion Analysis Settings.
Verify Measurements	Character	When the value in this field is Yes, indicates that linked Thickness Measurements require manual verification.	Always disabled. This field is populated automatically if the Measurement Value field in linked Thickness Measurements requires manual verification based upon the Corrosion Rate Variance validation.

Corrosion Analysis Settings

Each Asset and TML Corrosion Analysis has a set of related Corrosion Analysis Settings. In the case of TML Corrosion Analyses, most values in the Corrosion Analysis Settings are inherited from the settings specified for the asset or TML Group to which the TML is linked. When you create or modify Corrosion Analysis Settings, you are viewing a representation of the Corrosion Analysis Settings datasheet linked to the Asset or TML Corrosion Analysis.

It is recommended that you only access the datasheet in the context of the Corrosion Analysis Settings Workspace. The following table provides an alphabetical list of the fields that are visible on the Corrosion Analysis Settings workspace.

Corrosion Analysis Settings are accessible via an asset or TML Group, or via a TML. The table refers to the former as the asset level, and the latter as the TML level.

Field	Data Type	Description	Behavior and Usage
Allowable Measurement Variance	Numeric	Specifies a value for the amount of variation that is allowed between values in the Measurement Value fields of the two most recent Thickness Measurements linked to the related TML.	This field is used to validate measurement data. The value in this field is only considered if it is greater than 0.
Apply CCR to TML Rem Life Next Insp Date Calc	Boolean	When selected, indicates that Asset and TML Corrosion Analyses will use adjusted values for determining corrosion rate, remaining life, and next inspection dates.	This field is only considered if the Controlling Corrosion Rate is set to Average or Formula. When the check box in this field is selected, in an Asset Corrosion Analysis, the following occurs: The Asset Controlling Next Insp Date field is set to the value of the Asset Calc Adjusted Next Insp Date field. The Asset Controlling Remaining Life field is set to the value of the Asset Calc Adjusted Remaining Life field. The Asset Controlling Retire Date is set to the value of the Asset Calc Adjusted Retire Date field. When the check box in this field is selected, in a TML Corrosion Analysis the following fields are populated, if possible: Asset Average Corrosion Rate Asset Average Corrosion Rate Next Inspection Date Asset Average Corrosion Rate Remaining Life Asset Average Corrosion Rate Retirement Date
Comments	Text	Stores comments.	This field is not visible at the TML level.
Controlling Corrosion Rate	Character	Specifies the method (Maximum, Average, or Formula) by which a corrosion rate will be calculated for the asset.	This field is disabled at the TML level. Required. When Average is selected, in the related Asset Corrosion Analysis, the Controlling Corrosion Rate field will be populated with the value in the Average Corrosion Rate field. Additionally, when Average is selected, the following fields appear: Apply CCR to TML Rem Life Next Insp Date Calc Safety Factor Minimum Number of TMLs Percentile When Formula is selected, in the related Asset Corrosion Analysis, the Controlling Corrosion Rate field will be populated with the value in the Statistical Corrosion Rate field. Additionally, when Formula is selected, the Apply CCR to TML Rem Life Next Insp Date Calc field appears. When Maximum is selected, in the related Asset Corrosion Analysis, the Controlling Corrosion Rate field will be populated with the value in the Maximum Corrosion Rate field. By default, when you create Corrosion Analysis Settings, Maximum is selected.
Corrosion Rate Options	Boolean	Indicates which corrosion rates will be calculated for the TML.	This section is disabled at the TML level. The check boxes correspond to the following fields on the Corrosion Analysis Settings datasheet: Least Squares corresponds to Corrosion Rate Options - Least Square. Short Term corresponds to Corrosion Rate Options - Short Term. Long Term corresponds to Corrosion Rate Options - Long Term. By default, the Short Term and Long Term check boxes are selected. If custom corrosion rates are enabled, additional check boxes will be visible that correspond to those corrosion rates. Additionally, the check boxes determine the data that will be plotted on the TML Trends Graph.
Corrosion Rate Variance	Numeric	Specifies a value for the amount of variation that is allowed between the Short Term Corrosion Rate in the related TML Corrosion Analysis, and the Minimum Corrosion Rate.	This field is used to validate measurement data. The value in this field is only considered if it is greater than 0.
Default Inspection Interval	Numeric	Specifies in months the default interval for inspections for the TML.	This field is used to populate the Interval Next Inspection Date field in the related TML Corrosion Analysis.
Default T-Min	Numeric	Specifies the default minimum thickness value for calculations in the related corrosion analysis.	This field is disabled at the TML level. If the related TML Corrosion Analysis has no value in the Minimum Thickness field, the value in this field is used instead. By default, this field is 0.
Inspection Interval Options	Boolean	When selected, indicate that Remaining Life Factor and Default Inspection Interval should be used to determine the Factor Remaining Life Date and Interval Next Inspection Date, respectively. Additionally, this determines how Scheduled Next Inspection Date will be calculated for the related corrosion analysis.	This field is disabled at the TML level. The check boxes correspond to the following fields on the Corrosion Analysis Settings datasheet: Factor Remaining Life corresponds to Inspection Interval Options - Factor Remaining Life. Inspection Interval corresponds to Inspection Interval Options - Inspection Interval. When the Factor Remaining Life check box is selected, the Remaining Life Factor field is used to calculate the Factor Remaining Life Date field in the related TML Corrosion Analysis. When the Inspection Interval check box is selected, the Default Inspection Interval field is used to calculate the Interval Next Inspection Date field.
Minimum Corrosion Rate	Numeric	Specifies the default minimum corrosion rate value for calculations in the related corrosion analysis.	If a corrosion rate cannot be determined in the related corrosion analysis, the value in this field is used instead.
Minimum Number of TMLs	Numeric	Specifies the minimum number of TMLs that must be used to calculate the Average Corrosion Rate when the Percentile field is less than 100.	This field is only considered if the Controlling Corrosion Rate is set to Average. When the value in the Percentile field excludes TMLs from being used to calculate the Average Corrosion Rate, the value in this field ensures a minimum number of TMLs are still used to make the calculation. For example, assume the Minimum Number of TMLs field was set to 20. If the value in the Percentile field determined that only the 10 TMLs with the highest rate of corrosion linked to an asset should be used to calculate Average Corrosion Rate, the value in the Minimum Number of TMLs field would take precedence, and the 20 TMLs highest rate of corrosion would be used instead. By default, the value in this field is 1.
Percentile	Numeric	Specifies what percentage of TMLs linked to an asset should be used to calculate Average Corrosion Rate.	This field is only considered if the Controlling Corrosion Rate is set to Average. This field determines the percentage of TMLs linked to an asset or TML Group that will be used to calculate the Average Corrosion Rate for the related Asset Corrosion Analysis. The TMLs used will always be those with the most conservative (i.e., highest) corrosion rates. For example, if you have an asset with 50 linked TMLs, and the Percentile field is set to 20, the 10 TMLs with the highest rate of corrosion will be used to calculate the Average Corrosion Rate for the asset. By default, value in this field is 100, which means all TMLs linked to an asset are used to calculate the Average Corrosion Rate.
Remaining Life Critical Number of TMLs	Numeric	Specifies the number of TMLs that will be used when calculating the remaining life for an asset.	When the value in this field is 1, the most conservative (i.e., lowest) remaining life value from all TML Analyses linked to the asset will be used to populate the Asset Calculated Remaining Life field in the related Asset Corrosion Analysis. When the value in this field is greater than 1, the Remaining Life values from the corresponding number of TMLs will be averaged, and the Asset Calculated Remaining Life field will be populated with the result. By default, the value in this field is 1.
Remaining Life Factor	Numeric	Specifies a value that is used to multiply the Remaining Life in the related TML Corrosion Analysis.	This field is disabled at the TML level. The value in this field must be greater than 0 and less than or equal to 1. It is only used to multiply the value in the Remaining Life field in the related TML Corrosion Analysis if the Factor Remaining Life check box is selected.
Safety Factor	Numeric	Specifies a value that is used to multiply the calculated average in order to determine the Average Corrosion Rate.	This field is only considered if the Controlling Corrosion Rate is set to Average. The value in this field is used as a multiplier for the Average Corrosion Rate in an Asset Corrosion Analysis, which determines the displayed value in the Average Corrosion Rate field. By default, the value in this field is 1, which means the actual Average Corrosion Rate will be used.
Std Deviation Factor	Numeric	Specifies a value that is used to determine outliers when calculating Statistical Corrosion Rate.	This field is only considered if the Controlling Corrosion Rate is set to Formula. The value in this field is used as a multiplier for TML CR SD when calculating the Statistical Corrosion Rate in the related Asset Corrosion Analysis. By default, the value in this field is 2.
Use Minimum Corrosion Rate	Boolean	When selected, indicates that when the calculated corrosion rate for a TML is less than the Minimum Corrosion Rate, the Minimum Corrosion Rate will be used for calculations instead.	This field is disabled at the TML level. When the check box is selected, the value in the Minimum Corrosion Rate field will be used for calculations in place of the value in the Corrosion Rate field in the related TML, if that value is less than the Minimum Corrosion Rate. Note: If the Use Minimum Corrosion Rate check box is cleared and only one Thickness Measurement is linked to a TML, the Minimum Corrosion Rate will be used.

Thickness Monitoring Tasks

The following table lists the Thickness Monitoring Task fields that are populated automatically when a Thickness Monitoring Task record is created. The following table provides an alphabetical list of the fields visible on the Thickness Monitoring Task datasheet.

Field	Data Type	Description	Behavior and Usage
Asset ID	Character	Specifies a unique ID for the asset.	The Record ID of the Equipment or TML Group record to which the Thickness Monitoring Task record is linked.
Coverage	Numeric	Specifies the percentage of the asset to be inspected.	By default, this field is set to 0.
Desired Interval	Numeric	Specifies the desired time between inspections.	By default, this field is set to 0.
Equipment Technical Number	Character	Specifies a unique ID for the asset that is recognized by operations and inspection personnel.	The value in this field is typically from a piping and instrumentation diagram.
Last Date	Date	Specifies the date on which the asset was last inspected.	This field is populated with the date the asset or TML Group was last inspected.
Max Date	Date	Specifies the date on which the maximum interval will be reached.	This field is populated with the date in the Calculated Date field in the linked Asset Corrosion Analysis.
Max Interval	Numeric	Specifies the maximum time between inspection events.	By default, this field is set to 0.
Min Date	Numeric	Specifies the date on which the asset may become eligible for inspection.	This field is populated with the date in the Calculated Date field in the linked Asset Corrosion Analysis.
Min Interval	Numeric	Specifies the minimum time between inspection events.	By default, this field is set to 0.
Modifiable	Boolean	Indicates that you have allowed this record to be modified by others.	By default, this field is False.
Next Date	Date	Specifies the date on which the next inspection must be performed.	This field is populated with the date in the Asset Controlling Next Insp Date field in the linked Asset Corrosion Analysis.
Next Date Basis	Character	Specifies the driver of the next date.	Usually, the value for the driver in this field is a Code, a company policy, or based on Remaining Life calculations.
Reason	Text	Specifies why this work is being requested.	For example, a value in this field could be Defects found on asset.
Rejectable	Boolean	Indicates that this task can be rejected by the requested approver.	By default, this field is False.
Reoccurring	Boolean	Indicates that this is a repeating task.	By default, this field is False.
Task Description	Character	Specifies the work to be performed during the execution of the task.	For example a value in this field could be Insulation to be replaced.
Task ID	Character	Specifies a unique ID for the task.	This field is populated automatically when the Thickness Monitoring Task is created.
Task State	Character	Specifies the state of the task in the approval and execution process.	Usually, the states available in this field are created to support the workflow of the organization.
Task Type	Character	Specifies what inspection methodology should be used for this task.	For example, a value in this field could be Internal Inspection, or External Inspection.
Unconstrain Min/Max Dates	Boolean	Indicates that you will set the Max and Min Date fields manually.	By default, this field is False.