Threat category
Weather-Related and Outside Force
This family covers geotechnical and strain-driven conditions where the integrity question is often about loading, movement, and segment behavior rather than one anomaly row.
Quick scan
Category summary
8 topics currently available in this threat family.
Common concern drivers
- Active movement, changing support, or recurring strain indicators
- Coincident cracks, weld issues, wrinkle bends, or circumferential features
- Crossing, slope, thaw-settlement, or drainage context
- Sparse movement trend or patrol history
Common data gaps
- Missing IMU, strain, or survey history
- Sparse ROW observations or geohazard records
- Limited field confirmation of terrain and support condition
Common decision pitfalls
- Treating movement as a single-feature issue
- Ignoring segment-level loading
- Monitoring without documenting whether the movement is active or stable
Field verification themes
- Field work should capture terrain condition, support, drainage, exposure, and whether the pipe response matches the desktop interpretation.
Quick Methods and Reference Cards
Geohazard and strain review
Use segment-level loading and movement logic instead of relying on anomaly dimensions alone.
Dent Assessment and Management Guidance
API
Why it fits: Best for plain dents, dent at weld, dent with metal loss, and dent/strain interaction context.
Limitation: This app uses it as guidance context only; actual response criteria should follow approved company procedures.
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.
Geohazard and Land Movement Guidance Resources
PHMSA / Industry Guidance
Why it fits: Useful for geotechnical movement, strain concern, wrinkle bends, and cases where terrain context may control next actions.
Limitation: This is broad guidance context and should be paired with local geohazard procedures and monitoring programs.
Pipeline Research Council International (PRCI) Research
PRCI
Why it fits: Useful when a topic needs research-backed context or when the engineer needs to understand where industry understanding remains uncertainty-sensitive.
Limitation: Research context does not replace approved company procedures, validated software, or enforceable regulatory requirements.
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.
Geohazard and Land Movement Guidance Resources
PHMSA / Industry Guidance
Why it applies: Useful for geotechnical movement, strain concern, wrinkle bends, and cases where terrain context may control next actions.
What it generally addresses: General geohazard context for land movement, right-of-way monitoring, and ground-driven pipeline loading concerns.
Limitations: This is broad guidance context and should be paired with local geohazard procedures and monitoring programs.
Supporting context
Supporting / Cross-Discipline References
Helpful when the review needs integrity-management, regulatory, or cross-discipline context beyond the primary method family.
Dent Assessment and Management Guidance
API
Why it applies: Best for plain dents, dent at weld, dent with metal loss, and dent/strain interaction context.
What it generally addresses: Guidance for understanding dent types, interacting conditions, and practical data needs for dent review.
Limitations: This app uses it as guidance context only; actual response criteria should follow approved company procedures.
Pipeline Research Council International (PRCI) Research
PRCI
Why it applies: Useful when a topic needs research-backed context or when the engineer needs to understand where industry understanding remains uncertainty-sensitive.
What it generally addresses: Industry research support covering dent interaction, crack threats, geohazards, inspection capability, validation limits, and best-practice development.
Limitations: Research context does not replace approved company procedures, validated software, or enforceable regulatory requirements.
API 579
API
Why it applies: Useful as high-level fitness-for-service context when the condition needs broader damage-mechanism framing, documentation discipline, or escalation beyond simple screening.
What it generally addresses: General FFS mindset, damage-mechanism identification, and structured assessment thinking across multiple degradation types.
Limitations: It is not a pipeline integrity management rulebook and does not replace pipeline-specific methods, regulations, or company procedures.
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.
PHMSA and CER public guidance resources
PHMSA / CER
Why it applies: Useful for public advisories, guidance notes, and regulator-facing context that help explain where industry attention has been focused.
What it generally addresses: Public guidance, advisories, and oversight context for integrity programs and field response.
Drill Down by Workflow
Geotechnical / Strain
Topics
Browse this threat family
Each topic follows the same summary-plus-accordion guidance model, but the drill-down is organized by sub-workflow.
Geotechnical / Strain
Frost Heave / Thaw Settlement
Frost heave and thaw settlement guidance focuses on seasonal or progressive ground movement that changes support conditions, induces bending, or creates recurring strain concern at a location.
Geotechnical / Strain
Geotechnical Movement
Geotechnical movement covers land-driven loading such as slope movement, frost heave, settlement, washout, and unstable support conditions that may change strain demand or create secondary defect concerns.
Geotechnical / Strain
Landslide / Slope Movement
Landslide or slope movement guidance covers areas where hillslope instability, creep, washout, or erosion may be changing pipe support, introducing bending, or driving segment-level strain concerns.
Geotechnical / Strain
Ovality / Out-of-Roundness
Ovality or out-of-roundness review is the workflow for pipe cross-section distortion that may reflect construction, bending, settlement, external loading, or local geometry change rather than a discrete dent alone.
Geotechnical / Strain
Pipe Buckling / Local Buckle
Pipe buckling or local buckle review is used when the pipe shows compressive deformation, instability, or a geometry response that may reflect bending, axial compression, loss of support, or sustained outside-force loading rather than a simple dent or wrinkle alone.
Geotechnical / Strain
River Crossing Movement
River crossing movement addresses loading, exposure, scour, and support-change concerns at crossings where the pipe may be affected by channel migration, bank instability, or changing support conditions.
Geotechnical / Strain
Strain Concern
Strain concern is used when IMU, deformation, construction history, or related evidence suggests the pipe may be experiencing notable bending or strain that changes the meaning of nearby defects.
Geotechnical / Strain
Wrinkle Bend
Wrinkle bends are local geometric irregularities associated with bending or construction history. In integrity review they often matter less as a label and more as a clue to loading, strain concentration, or potential crack susceptibility.