Overview
There are two sets of models that calculate risk for pressure vessels; baseline and expanded. The following summarizes the capabilities of each set:
- Baseline models calculate risk for a single pressure vessel.
- Expanded models calculate risk for one pressure vessel and additional components as defined by the hierarchy and then summarizes risk to recommend mitigation tasks. The following components can be included in the hierarchy:
- up to 10 other components that can represent various things such as jackets, water boot, nozzles, etc.
Baseline Asset (RBI_VESSEL)
Application
This asset model applies to horizontal or vertical pressure equipment constructed of cylindrical sections where the pressure boundary is enclosed by heads of various shapes (e.g. elliptical, hemispherical, flat).
Mitigation recommendations were developed based on API 510 “Pressure Vessel Inspection Code” and API 572 “Inspection Practices for Pressure Vessels”.
Model Boundaries
This asset model provides risk analysis results and recommends mitigation tasks for the overall asset by damage mechanism.
The primary failure mode is loss of containment caused by one or many in-service damage mechanisms. Probability of failure categories are calculated for internal corrosion, external corrosion, corrosion under insulation, environmental cracking and creep. Up to five additional damage mechanisms can be added manually as Other Damage Mechanisms.
A safety consequence of failure category is calculated based on one of four types of representative fluids: flammable, toxic, reactive (i.e. cause injury to skin upon contact such as acids, caustics and steam) or inert. An option allows a flammable fluid to also include a toxic mixture. If the representative fluid is inert and initial state is gas, then a burst consequence can be calculated. The user can also manually enter a production loss consequence to represent any type of financial loss. When both safety and financial consequence are included then the overall risk is based on the worst consequence.
Link Models
This asset model should be linked to a hierarchy item where Type is “Asset”.
Hierarchy Templates
The following hierarchy template should be selected for the asset: Pressure Vessel – Metric (or SAE)
Dependencies
This asset model does not depend on other models.
Expanded Asset (RBI_SP_VESSEL)
Application
This parent asset model calculates risk for horizontal or vertical pressure equipment constructed of cylindrical sections and summarizes risk results from up to 10 other components (e.g. jacket, nozzle) to recommend mitigation tasks.
Mitigation recommendations were developed based on API 510 “Pressure Vessel Inspection Code” and API 572 “Inspection Practices for Pressure Vessels”. Two sets of recommendations are provided that address the overall asset and “worst” other components by damage mechanism.
Model Boundaries
This parent model provides risk analysis results for the parent asset and summarizes risk analysis results from other components so that mitigation tasks can be recommended for both the asset and other components by damage mechanism.
The primary failure mode is loss of containment caused by one or many in-service damage mechanisms. Probability of failure categories are calculated for internal corrosion, external corrosion, corrosion under insulation, environmental cracking and creep. Up to five additional damage mechanisms can be added manually as Other Damage Mechanisms.
A safety consequence of failure category is calculated based on one of four types of representative fluids: flammable, toxic, reactive (i.e. cause injury to skin upon contact such as acids, caustics and steam) or inert. An option allows a flammable fluid to also include a toxic mixture. If the representative fluid is inert and initial state is gas, then a burst consequence can be calculated. The user can also manually enter a production loss consequence to represent any type of financial loss. When both safety and financial consequence are included then the overall risk is based on the worst consequence.
Link Models
This parent model should be linked to a hierarchy item where Type is “Asset”. The other components must be linked to RBI_SP_CRP_CYLINDRICAL.
Hierarchy Templates
The following hierarchy template should be selected for the asset: Pressure Vessel – Metric (or SAE)
Dependencies
The other components must be children of the parent asset. (See RBI_SP_CYLINDRICAL).
Other Components (RBI_SP_CRP_CYLINDRICAL)
Application
This child model applies to other components such as jackets, nozzles, water boot, etc. that must be children of the parent asset which must be linked to RBI_SP_VESSEL.
Mitigation recommendations are provided by the parent model (RBI_SP_VESSEL).
Model Boundaries
This child model applies to one risk component at a time.
The primary failure mode is loss of containment caused by one or many in-service damage mechanisms. Probability of failure categories are calculated for internal corrosion, external corrosion, corrosion under insulation, environmental cracking and creep. Up to five additional damage mechanisms can be added manually as Other Damage Mechanisms.
A safety consequence of failure category is calculated based on one of four types of representative fluids: flammable, toxic, reactive (i.e. cause injury to skin upon contact such as acids, caustics and steam) or inert. An option allows a flammable fluid to also include a toxic mixture. If the representative fluid is inert and initial state is gas, then a burst consequence can be calculated. The user can also manually enter a production loss consequence to represent any type of financial loss. When both safety and financial consequence are included then the overall risk is based on the worst consequence.
Link Models
This child model should be linked to hierarchy items where Type is “Component” and parent is the parent asset (i.e. Pressure Vessel).
This model can be used for up to 10 other components (i.e. jackets, nozzles, etc.) where each component is a separate hierarchy item.
Hierarchy Templates
The following hierarchy templates should be selected for the asset: Jacket with Creep – Metric (or SAE)
Dependencies
This model provides risk analysis results that are summarized by the parent asset (RBI_SP_VESSEL).