Threat category
Internal Corrosion
This threat family covers internal corrosion review, including internal metal loss, pitting, flow-disturbance attack, deposit-related corrosion, and cases where service history matters as much as the reported anomaly dimensions.
Quick scan
Category summary
1 topics currently available in this threat family.
Common concern drivers
- Internal service, chemistry, water, solids, and upset history
- Low spots, dead legs, drips, tees, laterals, and flow disturbances
- Evidence of localized attack, pitting, or repeated internal activity
- Weak confidence in morphology, growth basis, or operating-context records
Common data gaps
- Missing service, inhibitor, water, solids, or upset-history information
- Sparse understanding of flow regime or internal hold-up locations
- Weak prior-run comparison or limited field verification of internal morphology
Common decision pitfalls
- Treating internal corrosion like generic external metal loss without checking service context
- Ignoring low-point, dead-leg, and flow-disturbance drivers
- Assuming one morphology label fully explains the active internal mechanism
Field verification themes
- Field work should confirm actual morphology where possible, local process or flow context, and whether deposits, fluids, or piping geometry fit the suspected internal mechanism.
Quick Methods and Reference Cards
Internal corrosion mechanism review
Use service, flow, chemistry, and water-hold-up context together with metal-loss screening to decide whether the reported feature fits internal corrosion behavior.
Profile-sensitive corrosion review
Use grouped and profile-sensitive corrosion thinking when the internal attack is irregular, localized, or influenced by deposits and flow disturbances.
In-line Inspection Systems Qualification Standard
API
Why it fits: Useful for data quality checks, feature confidence review, matching questions, and any topic driven by ILI limitations.
Limitation: This is a qualification and use framework, not a defect-specific engineering decision tool by itself.
Managing System Integrity for Hazardous Liquid Pipelines
API
Why it fits: Useful when operators need process discipline around evaluation, dig planning, repair scheduling, and record quality, especially on hazardous liquid systems.
Limitation: Guidance context only. It is not itself the enforceable repair timing rule, and it is less directly applicable to gas transmission than liquid integrity management workflows.
Manual for Determining the Remaining Strength of Corroded Pipelines
ASME
Why it fits: Most useful for general metal loss, axial corrosion, pitting, and corrosion screening discussions.
Limitation: Included here only as reference context. This app does not perform calculations and users should follow approved company procedures.
Corroded Pipelines Recommended Practice (DNV-RP-F101)
DNV
Why it fits: Most useful for corrosion-oriented topics such as general metal loss, axial corrosion, circumferential corrosion, pitting, interacting metal loss, and corrosion interaction cases where profile and grouping matter.
Limitation: This is corrosion-focused guidance and does not by itself resolve dent interaction, crack-like threats, or other non-corrosion damage mechanisms.
Modified B31G / RSTRENG Method References
Industry Practice
Why it fits: Most relevant to interacting metal loss, irregular corrosion morphology, and grouping decisions.
Limitation: Use only through approved company workflows and software implementations; the method still depends on reliable profile data.
References and Further Reading
Core applicable standards
Core Applicable Standards
Most directly relevant to this topic and commonly used to frame the main review path.
Managing System Integrity for Hazardous Liquid Pipelines
API
Why it applies: Useful when operators need process discipline around evaluation, dig planning, repair scheduling, and record quality, especially on hazardous liquid systems.
What it generally addresses: Integrity-management guidance that supports anomaly prioritization, remediation planning, documentation quality, and defensible workflow for hazardous liquid systems.
Limitations: Guidance context only. It is not itself the enforceable repair timing rule, and it is less directly applicable to gas transmission than liquid integrity management workflows.
Manual for Determining the Remaining Strength of Corroded Pipelines
ASME
Why it applies: Most useful for general metal loss, axial corrosion, pitting, and corrosion screening discussions.
What it generally addresses: Common corrosion assessment reference used to support remaining-strength thinking and corrosion response framing.
Limitations: Included here only as reference context. This app does not perform calculations and users should follow approved company procedures.
Corroded Pipelines Recommended Practice (DNV-RP-F101)
DNV
Why it applies: Most useful for corrosion-oriented topics such as general metal loss, axial corrosion, circumferential corrosion, pitting, interacting metal loss, and corrosion interaction cases where profile and grouping matter.
What it generally addresses: Corrosion assessment guidance covering single defects, interacting defects, complex corrosion shapes, and remaining-strength thinking for corroded pipelines.
Limitations: This is corrosion-focused guidance and does not by itself resolve dent interaction, crack-like threats, or other non-corrosion damage mechanisms.
Modified B31G / RSTRENG Method References
Industry Practice
Why it applies: Most relevant to interacting metal loss, irregular corrosion morphology, and grouping decisions.
What it generally addresses: Widely used corrosion-profile methodology references that support interaction and profile-based corrosion review.
Limitations: Use only through approved company workflows and software implementations; the method still depends on reliable profile data.
Supporting context
Supporting / Cross-Discipline References
Helpful when the review needs integrity-management, regulatory, or cross-discipline context beyond the primary method family.
In-line Inspection Systems Qualification Standard
API
Why it applies: Useful for data quality checks, feature confidence review, matching questions, and any topic driven by ILI limitations.
What it generally addresses: Foundational guidance for understanding ILI system qualification, performance, validation, and responsible use of inspection outputs.
Limitations: This is a qualification and use framework, not a defect-specific engineering decision tool by itself.
DNV-RP-F101
DNV
Why it applies: Useful as corrosion-assessment context for isolated, interacting, and complex-shaped metal-loss features and for thinking beyond simple box dimensions.
What it generally addresses: Profile-sensitive corrosion assessment concepts, interacting defects, and combined loading context for corroded pipelines.
Limitations: It is a corrosion-focused method family and does not by itself resolve dent interaction, crack-like behavior, or non-corrosion damage mechanisms.
API 579
API
Why it applies: Useful as broad FFS context when the corrosion condition becomes irregular, interacting, or difficult to close with ordinary screening assumptions alone.
What it generally addresses: General fitness-for-service framing for metal loss, pitting, laminations, dents/gouges, and documentation discipline.
Limitations: API 579 is not a direct replacement for pipeline-specific corrosion methods or operator-approved response criteria.
API RP 1160
API
Why it applies: Provides integrity-management process context for anomaly prioritization, remediation planning, and defensible documentation.
What it generally addresses: Workflow discipline, repair scheduling context, and record quality rather than defect mechanics alone.
Limitations: Guidance framework only; enforceable timing comes from applicable CFR requirements and operator procedures.
PRCI research and guidance
PRCI
Why it applies: Useful when operator workflows need research-backed context on defect interaction, assessment limits, or field validation practice.
What it generally addresses: Industry best-practice and research support for complex or uncertain conditions.
Limitations: Research context is not itself an operating procedure or repair criterion.
49 CFR Parts 192 and 195
PHMSA
Why it applies: Provide the U.S. regulatory framework that operators commonly review when anomaly evaluation, remediation, documentation, and timing decisions need to be tied back to pipeline safety rules.
What it generally addresses: High-level regulatory context for integrity management, repair timing, maintenance, evaluation, and documented response.
CSA Z662 Oil and Gas Pipeline Systems
CSA Group
Why it applies: Provides Canadian technical and program context where the operator or jurisdiction uses CSA Z662 to frame integrity, maintenance, repair, and evaluation practices.
What it generally addresses: Canadian pipeline systems context for integrity management, maintenance expectations, and defect-related technical framework.
Additional learning
Additional Learning Resources
Good places to deepen understanding of practical behavior, research context, and broader industry guidance.
Pipeline Research Council International (PRCI)
PRCI
Why it applies: Publishes research that helps engineers understand real-world behavior, inspection limitations, interaction effects, and emerging practices across many threat types.
What it generally addresses: Research-backed context for defect behavior, validation limits, and applied integrity practice.
NACE / AMPP corrosion and cracking guidance
NACE / AMPP
Why it applies: Useful for deeper understanding of corrosion mechanisms, SCC context, and related integrity practices that sit alongside pipeline-specific methods.
What it generally addresses: Mechanism-focused corrosion and cracking knowledge and supporting guidance.
DNV recommended-practice context
DNV
Why it applies: Useful when engineers want deeper conceptual grounding for interacting defects, corrosion behavior, or other complex assessment cases.
What it generally addresses: Cross-discipline recommended-practice context for advanced assessment thinking.
Drill Down by Workflow
Metal Loss
Topics
Browse this threat family
Each topic follows the same summary-plus-accordion guidance model, but the drill-down is organized by sub-workflow.
Metal Loss
Internal Corrosion Review
Internal corrosion review is the workflow for metal loss that may be driven by the product stream, water hold-up, solids, deposits, flow disturbances, dead legs, drips, or other service-related internal conditions rather than outside environment alone.