{"abstention_reason":null,"arm":"SUBSTRATE_DIVERSE_P2","candidate_id":"continuity_rupture_regime_diagnosis_and_transition_design__engineering_design__SUBSTRATE_DIVERSE_P2","cell_id":"continuity_rupture_regime_diagnosis_and_transition_design__engineering_design","decision":"PROPOSAL","experiment_id":"eoa_inverse_innovation_exp13_second_slot_policy60_20260806","proposal":{"actors":["Gas pipeline integrity engineers","Pipeline operators and control-room personnel","Materials and fracture-mechanics laboratories","Weld and pipe manufacturers","Hydrogen producers and shippers","Field inspection and maintenance crews","Pipeline safety regulator","Communities, workers, and customers exposed to service interruption or loss of containment"],"affected_objective":"Maintain containment and dependable gas transport while deciding whether, where, and at what tempo existing natural-gas pipeline segments can transition to hydrogen-bearing service.","arm":"SUBSTRATE_DIVERSE_P2","authority_safety":{"authorized_first_step":"The pipeline integrity manager may expose retired-pipe coupons in an isolated laboratory pressure loop and mechanically test them under an approved laboratory safety plan; no operating pipeline, live bypass, blend specification, or pressure limit may be changed.","decision_authority":"The pipeline operator's accountable integrity executive owns internal gates, subject to independent fracture-mechanics review, process-safety approval, and all required regulator and asset-owner authorization; the laboratory safety officer controls test-loop operation.","excluded_actions":["Connecting the first experiment to an operating pipeline","Increasing hydrogen content or operating pressure in live assets from coupon evidence alone","Interpreting absence of coupon failure as proof that an in-service segment is fit","Exceeding coupon-cell pressure, temperature, or gas-inventory limits","Opening a hydrogen-exposed cell before isolation, depressurization, purge, and atmosphere verification","Crossing an irreversible conversion or replacement gate without independent material-state evidence"],"halt_rollback":"Any later sidestream exposure must automatically isolate at both block valves and be depressurized to a closed recovery vessel if leakage, permeation, temperature, strain, pressure-decay, or atmosphere readings cross predeclared limits. A live blend trial must return to its last authorized composition and pressure envelope when stop conditions fire, while the segment is quarantined for inspection because reversing gas composition cannot reverse accumulated material damage."},"baseline":"Use records, nominal material grades, periodic external inspection, conventional integrity calculations, and laboratory literature to assign hydrogen-service limits; then raise blend fraction through scheduled stages or replace segments classified as categorically unsuitable, without direct co-exposure evidence showing whether each material and weld population is drifting, approaching a fracture threshold, or retaining damage after hydrogen removal.","candidate_id":"continuity_rupture_regime_diagnosis_and_transition_design__engineering_design__SUBSTRATE_DIVERSE_P2","causal_chain":["Hydrogen enters steel and concentrates near crack tips, inclusions, hard weld zones, and stressed microstructures while pressure cycling advances fatigue damage.","Fleet-average leakage rates and nominal blend fractions can change smoothly even as particular heats, welds, defects, or cycle histories approach nonlinear losses of ductility or fracture resistance.","Pressure-rated sidestream cells expose removable, precracked material sentinels to controlled gas chemistry, pressure cycles, temperature, moisture, and contaminants that reproduce the relevant physical loading path.","Direct permeation, strain, crack-extension, hardness, toughness, and fracture-surface measurements separate hydrogen-assisted damage from ordinary fatigue, corrosion, specimen artifacts, and instrumentation changes.","Step-up and step-down exposures reveal threshold ranges and whether crack-growth or toughness changes persist after hydrogen partial pressure is reduced, distinguishing simple reversibility from material memory.","Mapping those results to pipe heats, weld procedures, defects, records, isolation boundaries, repairability, and customer dependencies identifies which functions and assets may persist, require restriction, need reinforcement, or must be retired.","The diagnosed material regime supports a segment-specific choice among gradual blending, bounded zonal trials, parallel new-pipe operation, pressure derating, reinforcement, or decisive exclusion and replacement.","Continued sentinel exposure and destructive retrieval after each authorized stage test whether the assumed regime remains valid and trigger pause, rollback of operating conditions, inspection, or redesign before loss of containment."],"cell_id":"continuity_rupture_regime_diagnosis_and_transition_design__engineering_design","consequence":"A false-continuity diagnosis could permit hydrogen-assisted cracking to cross a segment-specific fracture threshold without a corresponding smooth warning in fleet metrics; a false-rupture diagnosis could cause unnecessary replacement, service disruption, embodied-material loss, and premature abandonment of pipe that could operate safely within a bounded regime.","diversity_from_prior_proposals":"P1 concerns an electrical transmission area's dynamic control and protection reorganization using archived disturbance traces and offline network models. This proposal concerns irreversible microstructural damage and fracture in hydrogen-exposed pipeline materials, using physical co-exposure cells, removable coupons, and destructive mechanical measurements. Its problem, intervention, observable state, actors, failure physics, and causal path are materially independent of P1.","experiment_id":"eoa_inverse_innovation_exp13_second_slot_policy60_20260806","intervention":"Build a Hydrogen Material-State Sentinel Bypass for representative pipeline material populations. Each isolated, pressure-rated cell contains removable precracked coupons made from retired pipe, archived production material, or verified weld replicas and exposes them to specified gas composition, pressure cycling, temperature, moisture, and contaminants. Direct permeation, strain, pressure-decay, crack-growth, toughness, and fracture-surface measurements are collected before, during, and after step-up and step-down exposures. Results are organized by material heat, weld zone, defect class, operating history, and spatial segment to classify drift, threshold crossing, retained damage, or replacement need; compare gradual blending, zonal pilots, pressure derating, reinforcement, parallel pipe, and abrupt exclusion; and set physical inspection, isolation, fallback, and retirement gates.","mechanism_mapping":[{"counterfactual_removal":"Without measurements across individual cycles, exposure blocks, coupon locations, material populations, and fleet summaries, a local crack-growth acceleration could be smoothed into an apparently continuous blend response.","mechanism_slug":"multi_resolution_change_point_and_trend_comparison","role":"Compare permeation, strain, crack extension, and toughness at cycle, exposure-block, coupon, weld-zone, segment, and fleet scales while preserving instrument and specimen changes."},{"counterfactual_removal":"Without tracing gas entry, trapping, local stress, crack-tip response, crack extension, and final fracture morphology, ordinary fatigue or specimen preparation could be mistaken for hydrogen-assisted rupture.","mechanism_slug":"process_tracing_and_mechanism_discrimination","role":"Trace the physical sequence from hydrogen partial pressure and pressure cycling through uptake, local material response, crack propagation, residual toughness, and fracture surface."},{"counterfactual_removal":"Without paired evidence, either conversion advocates or replacement advocates could treat selected intact or failed specimens as representative of the entire asset population.","mechanism_slug":"continuity_rupture_claim_matrix","role":"Pair each claim of retained containment capability with contrary crack, toughness, or subgroup evidence and each claimed material rupture with evidence of bounded performance or specimen-specific artifacts."},{"counterfactual_removal":"Without step-up, hold, step-down, purge, and retest exposures, a temporary hydrogen response could be confused with persistent damage, and different entry and recovery thresholds would remain invisible.","mechanism_slug":"threshold_hysteresis_and_reversibility_probe","role":"Physically vary hydrogen partial pressure and pressure-cycle amplitude, then remove hydrogen and retest coupons to estimate threshold ranges, retained damage, and asymmetric return paths."},{"counterfactual_removal":"Without simultaneous control and hydrogen cells plus rehearsed isolation, exposure differences could be confounded by ordinary aging, and a later live sidestream could lack a verified safe-state transition.","mechanism_slug":"parallel_transition_and_cutover_rehearsal","role":"Run matched methane-rich control and hydrogen-bearing cells, rehearse double isolation, depressurization, purge, specimen retrieval, and cell sunset before any operating-pipeline connection."},{"counterfactual_removal":"Without retrieval and destructive testing after an authorized stage, intact pressure boundaries could conceal accumulating crack-tip damage or a transition burden concentrated in one material population.","mechanism_slug":"post_transition_legacy_loss_and_regime_audit","role":"Retrieve sentinels after each bounded stage and compare promised versus measured toughness, crack growth, retained damage, affected segments, repair burden, and continuing dependence on legacy restrictions."}],"nearest_rivals":["Literature-based hydrogen compatibility screening: uses published material classes but may not represent the actual heat, weld, defect, contaminant, and pressure-cycle history of a segment.","Inline inspection campaign: locates and sizes accessible defects but does not directly expose representative crack tips to the proposed hydrogen regime or measure post-exposure toughness.","One-time laboratory qualification: tests specimens under a selected condition but may miss accumulation, threshold range, step-down hysteresis, and changing field chemistry.","Hydrostatic proof test: demonstrates survival of a bounded load event but can alter defects and does not isolate hydrogen-assisted subcritical crack growth.","Categorical replace-or-retain rule: simplifies transition planning but cannot justify mixed regimes across material populations or distinguish pressure derating from replacement."],"negative_tests":{"intervention_falsifier":"Blind sentinel results fail to predict the direction or material ranking of crack growth and residual toughness in independently removed validation specimens, or they produce no different segment classification or transition gate than the baseline workflow despite adequate exposure fidelity and measurement power.","problem_falsifier":"Across representative heats, weld zones, defect geometries, contaminants, temperatures, and worst-plausible pressure cycles, hydrogen-bearing exposure produces only smooth, bounded, reversible property changes; rankings remain stable across scales; step-down paths match step-up paths; and existing integrity factors remain valid throughout the contemplated operating envelope.","risks":["Sentinel coupons may not reproduce residual stress, constraint, surface condition, or aging of an installed pipe.","Accelerated cycling may create a failure mechanism absent at field rates or suppress a time-dependent one.","Retired or archived material may be unrepresentative of undocumented pipe heats and repairs.","Small specimens may miss long-crack, full-wall, or interacting-defect behavior.","Hydrogen leakage, ignition, pressure release, or brittle cell failure could harm laboratory or field personnel.","Opening or machining exposed coupons could release trapped gas or alter fracture evidence.","A benign sentinel result could be overgeneralized to unsampled segments.","A step-down in blend fraction may be called rollback even though accumulated material damage remains.","Installing a later live bypass could introduce new leak paths and isolation dependencies."],"strongest_counterevidence":"Existing codes, conservative fracture assessments, inline inspection, and qualified laboratory programs may already bound hydrogen-service transitions adequately, while small sidestream sentinels may add misleading specimen-scale evidence rather than improve segment decisions."},"next_evidence_step":"Preregister rival mechanisms, material invariants, threshold criteria, and falsifiers; then construct two isolated laboratory cells using blind-matched precracked coupons from one retired pipe heat and its weld zones. Expose one cell to the proposed hydrogen-bearing gas and the other to a methane-rich control under identical bounded pressure cycles, include step-up and step-down phases, and destructively measure crack extension and residual toughness. Reserve matched coupons for an independent validation laboratory, prohibit any connection to live assets, and require a process-safety and fracture-mechanics review before interpreting the result as transition evidence.","observable_state":"Coupon provenance and metallurgy; weld zone and hardness; crack geometry; gas composition and hydrogen partial pressure; moisture and contaminants; temperature; pressure-cycle amplitude, rate, and count; permeation flux; pressure decay; local strain; crack-mouth opening; acoustic events; measured crack extension; fatigue-crack-growth rate; residual fracture toughness and ductility; fracture-surface morphology; retained hydrogen after purge; control-cell differences; sensor calibration drift; missing observations; and the mapping uncertainty between each coupon and in-service segments.","prior_art_status":"UNSEARCHED","problem":"Operators considering hydrogen-bearing service in existing steel gas pipelines may see blend fraction and fleet integrity indicators change gradually while hydrogen uptake, pressure cycling, crack-tip chemistry, weld microstructure, and pre-existing defects interact to create segment-specific thresholds and retained damage. Records and nominal grades often cannot show whether a material population remains in the natural-gas fatigue regime, has entered hydrogen-assisted crack growth, or can recover when hydrogen content is reduced. The unresolved engineering decision is therefore which assets can transition gradually, which require bounded coexistence or derating, and which require decisive exclusion or replacement.","proposal_index":2,"remaining_contrastive_claim":"The opportunity remains distinct only if physical co-exposure and post-exposure testing reveal material-specific thresholds or retained damage that change at least one segment's justified transition tempo, pressure envelope, inspection gate, reinforcement choice, or retirement decision relative to records, literature factors, and ordinary inspection alone.","revision_record":{"claim_changes":["No novelty, prevalence, demand, or effect-size claim is made.","The central claim is limited to a falsifiable change in segment classification or transition regime caused by direct material-state evidence."],"conceptual_changes":["The archetype is realized as diagnosis of a physical microstructural transition rather than an electrical control-regime transition.","Reversibility is defined as recovery of measured material properties and crack behavior, not merely restoration of gas composition."],"evidence_changes":["No external search or prior-art inspection was performed.","The first evidence step uses matched control exposure, blind specimens, destructive measurements, step-down testing, and independent validation."],"operational_changes":["The initial work is confined to isolated laboratory cells and retired material.","Live blending, pipeline connection, and asset reclassification are excluded from the first step."],"parent_version":null,"progress_targets_addressed":["Materially independent engineering problem, intervention, and causal path","Eligible measurement-instrumentation substrate","Typed physical object, properties, scales, and invariants","Threshold, hysteresis, and reversibility testing","Legacy, transition-regime, authority, and recovery mapping","Counterevidence, falsifiers, risks, and bounded evidence step"]},"schema_version":1,"structural_mapping":[{"archetype_element":"Change Object, Property, and Invariant Frame","domain_realization":"The object is a pipeline segment's material containment regime; properties include hydrogen uptake, fatigue-crack growth, weld-zone response, fracture toughness, leak tightness, and inspectability; invariants include bounded crack growth, pressure containment, isolatability, traceable material identity, and safe service restoration."},{"archetype_element":"Multi-Scale Timeline and Boundary Set","domain_realization":"Align individual pressure cycles, exposure blocks, seasonal temperature and gas chemistry, inspection intervals, repairs, manufacturing dates, and proposed blend stages; compare blend introduction, cumulative cycles, contaminant excursions, and first persistent property loss as alternative boundaries."},{"archetype_element":"Change-Mechanism and Regime Classifier","domain_realization":"Classify behavior as ordinary fatigue drift, hydrogen accumulation, crack-growth threshold crossing, contaminant shock, persistent microstructural damage, specimen or instrument artifact, reinforcement-compatible continuity, or replacement-requiring rupture."},{"archetype_element":"Continuity–Rupture Evidence Ledger","domain_realization":"Record paired persistence and break evidence for every material population with coupon provenance, weld zone, defect geometry, exposure path, scale, uncertainty, calibration, missingness, control comparison, and in-service mapping limits."},{"archetype_element":"Threshold, Path-Dependence, and Reversibility Profile","domain_realization":"Use step-up, hold, step-down, purge, and destructive retest sequences to estimate hydrogen and cycling threshold ranges, crack-growth acceleration, retained toughness loss, entry-versus-return asymmetry, and accumulated damage that operating rollback cannot erase."},{"archetype_element":"Affected-Party, Legacy, and Loss Map","domain_realization":"Assign preservation, reinforcement, restriction, archiving, replacement, or retirement treatment to pipe heats, weld procedures, coatings, valves, isolation sections, inspection baselines, material records, maintenance knowledge, service obligations, and emergency access."},{"archetype_element":"Transition-Regime, Safeguard, and Cutover Plan","domain_realization":"Compare gradual blending, bounded zonal trials, pressure derating, reinforcement, parallel new pipe, and decisive exclusion; attach material-evidence gates, physical isolation, purge requirements, inspection boundaries, fallback envelopes, and retirement conditions."},{"archetype_element":"Regime Monitor, Recovery, and Revision Loop","domain_realization":"Continue exposure and periodic coupon retrieval to track crack growth, permeation, residual toughness, subgroup divergence, sensor drift, retained damage, repair burden, and mapping error, with triggers to hold, reduce operating exposure, isolate, inspect, reinforce, or redesign."}],"substrate_contract":{"counterfactual_independence":"If software, models, databases, information routing, organizational workflow, and automated control are removed, the pressure-rated cells still physically expose representative material to the gas and stress path, and calibrated gauges plus destructive mechanical tests still reveal permeation, crack extension, and residual toughness. Those physical measurements supply the essential diagnostic effect; wrappers only record, compare, authorize, and communicate it.","forbidden_channel_audit":"No governance rule, training program, incentive, software classifier, simulation, database, or digital controller is credited with producing hydrogen uptake, crack growth, isolation, or toughness evidence. Automated logging and valve actuation may support safety, but eligibility rests on physical co-exposure, material response, direct instrumentation, destructive testing, and mechanical isolation. A proposal reduced to record review, modeling, or transition committees would not qualify.","primary_allowed_process":"MEASUREMENT_INSTRUMENTATION"},"title":"Hydrogen Material-State Sentinel Bypass for Pipeline Transition Decisions","version":0},"schema_version":1}