Criticality Degradation Mechanism Evaluation Records

RBI Degradation Mechanism Evaluation records are used to determine degradation mechanisms that affect Equipment and Functional Locations. This topic provides an alphabetical list and description of the fields that exist for the RBI Degradation Mechanism Evaluation (DME) family. The information in the table reflects the baseline state and behavior of these fields. The Criticality Degradation Mech, Evaluation table lists common fields shared across several DMEs. Fields that are unique to a specific component type can be viewed by expanding the appropriate drop-down heading.

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Criticality Degradation Mech Evaluation

Field	Data Type	Description	Behavior and Usage
Main
Custom Calculation Policies Used	Character	A list of custom policies that are used to calculate the DME.	The value in this field must be 500 characters or less.
Custom Calculations Used	Boolean	Indicates whether or not the Degradation Mechanism Evaluation was calculated using the method specified in the Custom DME Configuration.	None
Damage Mechanism	Character	A process that induces deleterious micro and/or macro material changes over time that are harmful to the material condition or mechanical properties.	None
Probability Category	Character	Extent to which an event is likely to occur within the time frame under consideration. The mathematical definition of probability is a real number in the scale of 0 to 1 and is attached to a random event.	None
Probability Category Description	Character	Category to which an event is likely to occur within the time frame under consideration. The mathematical definition of probability is a real number in the scale 0 to 1 and is attached to a random event.	None
Input Fields
Date in Service	Date	Indicates the date on which the asset was exposed to the environment, making it susceptible to this Degradation Mechanism.	This date is used as the basis for all the calculations for each Degradation Mechanism.
Equivalent Number of Inspections	Numeric	A value that represents the summation of averaging a group of inspections over a period of time.	This approach is used only with the semi-quantitative risk model in GE Digital APM.
Estimated Rate	Numeric	The corrosion rate given by the subject matter expert for the asset.	Should be used in the absence of quality ultrasonic thickness (UT) data.
Inspection Confidence	Character	Describes how effective the prior inspections were at correctly identifying the presence and extent of internal corrosion.	An input from the following categories: Very High (VH) High (H) Medium (M) Low (L)
Inspection Date	Date	The date on which the inspection was performed on the component.	None
Selected Corrosion Rate	Numeric	Indicates which corrosion rate the risk analyst has chosen as the basis of the analysis.	Used for all remaining life calculations in RBI.
Use Combined Confidence	Boolean	Indicates whether or not the risk analyst has chosen to use the Rule of Threes.	None
Wall Thickness Loss	Numeric	Indicates how much of the original wall thickness has been lost at the time of analysis.	None
Intermediate Output
DF	Numeric	Damage Factor (DF) is a calculated value that quantifies the extent of damage from this Degradation Mechanism at the time of the analysis.	None
Estimated Half Life	Numeric	Half of the calculated remaining life.	The value in this field is the result of the following calculation: ((Initial Wall Thickness) – (Ext. Est. Wall Loss) – (Ext. Est. Min. Thickness)) / (2 * (Ext Corr. Rate)) This value will be used to cap the inspection interval.
Estimated Wall Loss	Numeric	Estimates how much of the original wall thickness has been lost at the time of analysis.	None
Failure Frequency	Numeric	A Probability of Failure (PoF) developed for specific component types based on a large population of component data that does not include the effects of specific damage mechanisms.	This data is one of the factors used to determine the PoF.
Fractional Wall Loss	Numeric	The Fractional Wall Loss is calculated by dividing the estimated internal wall loss by the original wall thickness.	None
Wall Ratio	Numeric	The estimated remaining wall divided by the required minimum wall thickness.	Used as a tool to validate the data used in the assessment.
Years in Service	Numeric	The number of years an equipment item has been in service. This time frame is measured from the initial date in its current service to the time the Probability of Failure Analysis is performed.	None

Criticality Env. Crack. Deg. Mech. Eval.

Field	Data Type	Description	Behavior and Usage
Input Fields
Cyanides	Boolean	Indicates whether or not cyanides are present.	None
Damage at Last Inspection	Boolean	Indicates whether Wet H2S damage was found at the last inspection.	None
Date in Service	Date	Indicates the date on which the asset was exposed to the environment, making it susceptible to this Degradation Mechanism.	The date in this field must be earlier than or equal to the date in the Inspection Date field. This date is used as the basis for all the calculations for the Degradation Mechanism.
Env. Cracking Higher Levels	Boolean	Allows the risk analyst to add an additional factor if they believe that the likelihood of cracking is much higher.	This affects the results of the cracking assessment by an order of magnitude.
Free Water	Numeric	Water that is available to react with a cracking agent.	None
H2S Content	Character	The percentage of H2S in the process stream.	None
Initial Potential	Character	The potential for cracking based only on material and environmental criteria and not on inspection history.	None
Inspection Date	Date	The date on which the inspection was performed on the component.	The date in this field must be later than or equal to the date in the Date in Service field.
Is Entry Possible?	Character	Indicates whether or not it is possible to physically enter an asset for the purposes of performing an inspection.	None
PT or MT Access?	Character	Indicates whether or not it is possible to physically enter an asset from a Penetrant Testing (PT) point or a Magnetic Particle Testing (MT) point for the purposes of performing an Inspection.	None
PWHT	Boolean	Indicates whether or not Post Weld Heat Treatment (PWHT) has been performed to relieve residual stresses from construction of the asset.	None
Intermediate Output
Adjusted Env. DF	Numeric	Calculated value for the years in service.	None
Adjusted Years Last Inspection	Numeric	The adjusted number of years since the last inspection. This time is measured from the most recent inspection to the time the Probability of Failure (PoF) Analysis.	This is a calculated value.
Updated Potential	Character	The updated potential for damage is based on the number of prior inspections, their respective confidence levels, and whether or not damage was found during the last inspection.	This is a calculated value.
Years Last Inspection	Numeric	The number of years since the last inspection. This time is measured from the last inspection to the time the Probability of Failure (PoF) Analysis is conducted.	This is a calculated value.

Criticality Ext. Corr. Deg. Mech. Eval

Field	Data Type	Description	Behavior and Usage
Input Fields
Coating Quality	Character	The type of coating applied to the equipment before insulating.	This field contains the description of all the System Codes in the MI_RBI_Coating_Quality System Code Table. You can choose from the following baseline values: Best Average None The value in this field is used for calculating the value in the Coating Factor field.
Date in Service	Date	Indicates the date on which the asset was exposed to the environment, making it susceptible to this Degradation Mechanism.	The date in this field must be earlier than or equal to the date in the Inspection Date field. This date is used as the basis for all the calculations for the Degradation Mechanism.
Inspection Date	Date	The date on which the inspection was performed on the component.	The date in this field must be later than or equal to the date in the Date in Service field.
Insulation Condition	Character	The condition of the insulation.	This field contains the description of all the System Codes in the MI_RBI_Insulation_Condition System Code Table. You can choose from the following baseline values: Good Fair Poor
Near Cooling Tower?	Boolean	Indicates whether or not the equipment is located near a cooling tower.	None
Number of Penetrations	Numeric	Indicates the number of places in the piping circuit where the pipe penetrates the surrounding structure via an insulating cover.	By default, this field contains the value 0. If the DME is associated with a piping component, the value in this field is used in calculating the complexity of the piping circuit, which impacts the value in the Age field.
Number of Terminations	Numeric	Indicates the number of places in the piping circuit where the insulation starts or stops exposing the pipe to the atmosphere.	By default, this field contains the value 0. If the DME is associated with a piping component, the value in this field is used in calculating the complexity of the piping circuit, which impacts the value in the Age field.
Number of Vertical Runs	Numeric	Indicates the number of places in the piping circuit where the insulated pipe is oriented vertically for more than six feet.	By default, this field contains the value 0. If the DME is associated with a piping component, the value in this field is used in calculating the complexity of the piping circuit, which impacts the value in the Age field.
Intermediate Output
Adjusted ECDF	Numeric	The Empirical Cumulative Distribution Function (ECDF) is a calculated value for the years in service.	None
Age	Numeric	Indicated the external age of the component and is measured from the date the equipment item was renewed to a like-new condition.	The external age of a piece of equipment differs from its years in service. External age is measured from the date of the last painting or coating of the equipment. This field is disabled. The value in this field is calculated as follows: Age = Years in Service – (Coating factor x 5) For a piping component, the value in the Age field is based on the Coating Factor and the complexity of the piping circuit. Circuit Complexity is calculated as follows: Circuit Complexity = (Number of Penetrations + Number of Terminations + Number of Vertical Runs) / Piping Circuit Length Note: In the calculation, the value in the Piping Circuit Length field in the RBI Criticality Analysis is used. If the value in the Piping Circuit Length field is measured using a Unit Of Measurement other than feet, then for the calculation of Circuit Complexity, the value is converted to feet. Based on the Circuit Complexity and the value in the Coating Factor field, the value in the Age field of the piping component is calculated as follows: If the Circuit Complexity > 0.05, then: Age = Years in Service – (Coating factor x 5) If the Circuit Complexity <= 0.05 and >=0.01, then: Age = Years in Service – (Coating factor x 5) – 5 If the Circuit Complexity < 0.01, then: Age = Years in Service – (Coating factor x 5) – 10
Area Humidity Factor	Numeric	Should be set based on the humanity of the geographical region in which the asset is operated.	None
Calculated Corrosion Rate	Numeric	The Calculated Corrosion Rate for Corrosion Under Insulation (CUI) is the product of the external corrosion rate and the humidity factor.	None
Coating Factor	Numeric	That factor that results from the selection made in the Coating Quality field.	The value in the Coating Factor filed is calculated as follows: If you selected Coating Quality as None, then: Coating Factor= 0.2 If you selected Coating Quality as Average, then: Coating Factor= 1 If you selected Coating Quality as Best, then: Coating Factor= 2 The value in this field impacts the calculation of the value in the Age field.
Corrosion Factor	Numeric	That factor that results from the selection made in the Corrosion field.	The value in this field impacts the calculation.
Insulation Condition Factor	Numeric	The factor that results from the selection made in the Insulation Condition field.	The value in this field impacts the calculation.
Insulation Type Factor	Numeric	The factor that results from the selection made in the Insulation Type field.	The value in this field impacts the calculation.

Criticality Int. Corr. Deg. Mech. Eval

Field	Data Type	Description	Behavior and Usage
Input Fields
Controlling Corrosion Rate	Numeric	The controlling corrosion rate, in inches per year, of the Asset or the TML Group that is associated with the component.	This is the most conservative Controlling Corrosion Rate field on the Asset Corrosion Analysis family from all the TML Groups mapped to RBI Component. This field is disabled. If the value in the Source of Calculated Corrosion Rates field in the associated Component is: Asset, then this field is populated based on the value in the Controlling Corrosion Rate field in the associated Asset Corrosion Analysis in Thickness Monitoring. Component, then this field is populated based on the highest value in the Controlling Corrosion Rate fields in the associated Asset Corrosion Analyses linked to the TML Groups. Manual Entry, then this field is blank because controlling corrosion rate is always specified in Thickness Monitoring. You cannot enter a value in this field. Example: TML Group 1 – CCR - .3 MIL/Yr TML Group 2 – CCR - .45 MIL/Yr TML Group 3 – CCR - .33 MIL-Yr RBI Component is mapped to: TML Group 1 and TML Group 2 Resulting CCR on Internal DME : 00045 Inches/Yr Note: The value in the Controlling Corrosion Rate field in the Asset Corrosion Analysis is in mils per year. This value is converted to inches per year, and then used to populate this field. When you copy the analysis without copying the Recommendations, the value in this field is not copied. It is updated based on the Asset or TML Group that is linked to the component. When you copy the analysis along with the Recommendations, then the value in this field is copied.
Date in Service	Date	Indicates the date on which the asset was exposed to the environment, making it susceptible to this Degradation Mechanism.	The date in this field must be earlier than or equal to the date in the Inspection Date field. This date is used as the basis for all the calculations for the Degradation Mechanism.
Inspection Date	Date	The date on which the inspection was performed on the component.	The date in this field must be later than or equal to the date in the Date in Service field.
Predictable	Character	Indicates whether or not it is known where the most aggressive corrosion is happening in the asset.	None
Thinning Type	Character	Indicates what type of wall loss is occ urring in the asset.	None
Intermediate Output
Adjusted ICDF	Numeric	The Inverse Cumulative Distribution Functions (ICDF) is a calculated value based on the value in the Years in Service field.	None
Estimated Wall Remaining	Numeric	The estimated remaining wall thickness.	This is a calculated value.
Non-Intrusive Requirement Met	Boolean	Indicates whether you can perform intrusive or non-intrusive inspection on the component.	This check box is disabled and populated automatically.

Criticality Leak Deg. Mech. Eval.

Field	Data Type	Description	Behavior and Usage
Input Fields
Piping Vibration	Boolean	Indicates whether or not the asset is susceptible to piping vibration.	None
Pulsating/Cycling Service	Boolean	Indicates whether or not the asset has a Pulsating/Cycling service.	None
Service Severity - Leak	Character	Defines the consequences inherent to the particular process in which the devices operate.	None
Soft Seat	Boolean	Indicates whether or not the asset has a Soft Seat.	None
Intermediate Output
Final Inspection Interval	Numeric	The inspection interval that used for this device.	This is a calculated value.
Operation Ratio	Numeric	The ratio of the maximum system operating pressure to the set pressure.	None
Probability of Leak	Numeric	The data associated with the probability of leakage in failures per year.	None
Weibull Updated Characteristic Life	Numeric	A parameter modified to account for: Installation factors Design features Overpressure factors Environmental factors Years	None

Criticality Other Damage Mech. Eval.

Field	Data Type	Description	Behavior and Usage
Main
DF	Numeric	Damage Factor (DF) is a calculated value that quantifies the extent of damage from this Damage Mechanism at the time of analysis.	This is a calculated value.
Failure Frequency	Numeric	The Probability of Failure (PoF) developed for specific component types based on a large population of component data that does not include the effects of specific damage mechanisms.	This data is one of the factors used to determine the Probability of Failure (PoF).

Criticality Over Pressure Deg, Mech. Eval.

Field	Data Type	Description	Behavior and Usage
Intermediate Output
Failure Frequency of Protected Equipment	Numeric	The Probability of Failure (PoF) developed for specific component types based on a large population of component data that does not include the effects of specific damage mechanisms.	This data is one of the factors used to determine the Probability of Failure (PoF) for the asset.
Final Inspection Interval	Numeric	The inspection interval that will be used for this device.	This is a calculated value.
Modified Characteristic Life	Numeric	A parameter modified to account for: Installation factors Design features Overpressure Environmental factors Years	None
Overpressure	Numeric	Events that can cause failure of the equipment protected by the device, leading to a loss of containment.	None
Overpressure Factor (Fo)	Numeric	The factor that results from the selection made in the Overpressure field.	None
Probability of Failure on Demand	Numeric	The extent to which an event is likely to occur within the time frame under consideration. The mathematical definition of probability is a real number on the scale 0 to 1 and is attached to a random event.	None
Probability of Loss of Containment	Numeric	Extent to which an event is likely to occur within the time frame under consideration. The mathematical definition of probability is a real number in the scale 0 to 1 and is attached to a random event.	None
Weibull Updated Characteristic Life Parameter	Numeric	A parameter modified to account for: Installation factors Design features Overpressure Environmental factors Years	This is a calculated value.

Criticality Third Party Deg. Mech. Eval.

Field	Data Type	Description	Behavior and Usage
Input Fields
Above Ground Facilities	Character	Indicates that sections of the pipeline are above ground and are susceptible to specific modes of damage.	None
Activity Level	Character	Indicates the level of human activity in the vicinity of the asset.	Increased activity increases the likelihood that damage may occur.
Below Bottom of Waterway	Character	In the case of pipeline segments that are submerged at a water crossing, credit is given for depth below water surface and for depth below bottom of waterway.	None
Below Water Surface	Character	The depth below the water's surface.	None
Concrete Coating	Character	A protective coating around the pipeline to prevent damage.	None
Mechanical Pipe Protection	Character	Mechanical protection that shields the pipe from third-party damage by one of the following methods: Coating the pipe with reinforced concrete. Encasing the pipe. Placing a reinforced concrete slab over, but not in contact with, the pipe.	None
Minimal Depth of Cover	Numeric	The depth of coverage at the shallowest point for a pipeline segment.	The average depth of cover for a pipeline segment directly influences the probability of a release due to third-party damage.
One-Call System	Character	A one-call system is a service that receives calls regarding upcoming excavation activities and relays the information to the affected utilities.	A line locating program is central in avoiding third-party damage.
Patrol Frequency	Character	Describes how often the pipeline is patrolled.	Patrolling the pipeline is a proven method of reducing third party intrusions. The patrols are a means to identify impending threats to the pipeline (e.g. construction activities).
Pipeline Market Tape (Warning Mesh)	Character	Marker tape or warning mesh installed above a pipeline is an additional measure to protect against third party damage.	The brightly colored tape or mesh installed above the pipeline may help avert damage to the pipeline.
Previous Damage	Character	Indicates whether or not damage was observed during prior inspection activities.	None
Public Education	Character	The programs put in place to warn those who live or work near pipeline assets.	Public education programs are thought to play a significant role in reducing third-party damage to pipelines.
Right-Of-Way Condition	Character	Pipeline rights of way are defined parcels of land where pipelines and related equipment are installed underground and above ground.	A clearly marked, easily recognized Right-of-Way reduces the susceptibility to third-party damage.
Submerged at Water Crossing	Boolean	Indicates whether or not the pipeline segment is underwater at the point of crossing.	None
Intermediate Output
Above Ground	Numeric	Indicates that sections of the pipeline are above ground and are susceptible to specific modes of damage.	None
Activity Level Points	Numeric	The points awarded for the selection made in the Activity Level field.	The value in this field impacts the calculation.
Depth of Cover Points	Numeric	The points awarded for the selection made in the Depth of Cover field.	The value in this field impacts the calculation.
One-Call System Points	Numeric	The points awarded for the selection made in the One-Call System field.	The value in this field impacts the calculation.
Patrol Frequency Points	Numeric	The points awarded for the selection made in the Patrol Frequency field.	The value in this field impacts the calculation.
Previous Damage Points	Numeric	That points awarded for the selection made in the Previous Damage field.	The value in this field impacts the calculation.
Probability of Failure	Numeric	The extent to which a Probability of Failure (PoF) event is likely to occur within the time frame under consideration. The mathematical definition of probability is a real number in the scale 0 to 1 and is attached to a random event.	None
Probability of Failure - TPD	Numeric	The extent to which Third Party Damage (TPD) event is likely to occur within the time frame under consideration. The mathematical definition of probability is a real number in the scale 0 to 1 and is attached to a random event.	None
Public Education Points	Numeric	The points awarded for the selection made in Public Education field.	The value in this field impacts the calculation.
Right-Of-Way Condition Points	Numeric	The points awarded for the selection made in Right-Of-Way (RoW) field.	The value in this field impacts the calculation.
Total Points (TPD)	Numeric	The summation of all points resulting from the data used in the analysis.	The value in this field impacts the calculation.