Process Pipe RBI Models

Overview

There are two sets of models that calculate risk for process piping; baseline and expanded. The following summarizes the capabilities of each set:

  • Baseline models calculate risk for a single piping circuit. 
  • Expanded models calculate risk for one piping circuit 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, line segments, etc.

Baseline Asset (RBI_PROCESS_PIPE)

Application

This asset model applies to process piping designed according to ASME B31.3 or similar design standard. This model does not apply to transmission pipelines transporting either liquid or gas and designed according to ASME B31.4/B31.8 or similar design standard. 

Mitigation recommendations were developed based on API 570 “Piping Inspection Code” and API 574 “Inspection Practices for Piping System Components”.

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: Pipe – Metric (or SAE)

Dependencies

This asset model does not depend on other models.

Expanded Asset (RBI_SP_PROCESS_PIPE)

Application

This parent asset model calculates risk for process piping designed according to ASME B31.3 or similar design standard and summarizes risk results from up to 10 other components (e.g. jacket, nozzle) to recommend mitigation tasks. This model does not apply to transmission pipelines transporting either liquid or gas and designed according to ASME B31.4/B31.8 or similar design standard. 

Mitigation recommendations were developed based on API 570 “Piping Inspection Code” and API 574 “Inspection Practices for Piping System Components”. 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 one piping circuit and summarizes risk analysis results from other components so that mitigation tasks can be recommended for both the parent 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 asset 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: Pipe – Metric (or SAE)

Dependencies

The other components must be children of the parent asset.

Other Components (RBI_SP_CRP_CYLINDRICAL)

Application

This child model applies to other components such as jackets, nozzles, etc. that must be children of the parent asset which must be linked to RBI_SP_PROCESS_PIPE.

Mitigation recommendations are provided by the parent model (RBI_SP_PROCESS_PIPE).

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. Piping Circuit).

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_PROCESS_PIPE).