{"actors":["Pump-station systems engineer","Hydraulic design engineer","Controls engineer","Rotating-equipment reliability engineer","Operations representative","Independent process-safety reviewer","Parallel pumps treated as ensemble members"],"affected_objective":"Required station flow and discharge-pressure stability together with pump reliability, while preserving hydraulic safety limits and service continuity.","arm":"ORDINARY_DIVERSE_P2","authority_safety":{"authorized_first_step":"The station analysis lead may perform a read-only reconstruction of pump-level operating trajectories and an offline shadow simulation using approved historical operating data, documented pump curves, and existing limits.","decision_authority":"The station engineering change board, with operations and process-safety concurrence, retains authority to approve staging-policy changes, protection-setting changes, field trials, or equipment modifications.","excluded_actions":["No deployment of a revised staging or lead-lag policy from the offline analysis alone.","No change to minimum-flow, pressure, vibration, temperature, motor-current, surge, or shutdown protections.","No operation outside approved pump envelopes, header limits, reservoir constraints, or required redundancy.","No forced duty equalization when different pump condition, efficiency, or availability makes heterogeneous allocation appropriate.","No attribution of pump deterioration to an operator, vendor, or maintenance action without a separate causal investigation."],"halt_rollback":"Stop the offline evaluation if timestamps, pump identities, sensor validity, or control-state records cannot be reconciled. Any later authorized field trial must revert immediately to the approved staging policy upon unstable header pressure, loss of required redundancy, protection activation, unexpected vibration or temperature behavior, or operator concern."},"baseline":"Station acceptance and supervisory control rely on stable total discharge flow and shared-header pressure over each operating regime. Pump availability and hard protection alarms are monitored, but member-level run time, starts, distance from preferred operating region, recirculation exposure, vibration, and control-role persistence are not jointly evaluated against the stable station macrostate.","candidate_id":"ensemble_and_population_level_equilibrium_versus_individual_level_heterogeneity__engineering_design__ORDINARY_DIVERSE_P2","causal_chain":["Demand is served by an ensemble of parallel pumps connected to a common suction source and discharge header.","Pump curves, check-valve behavior, branch resistance, equipment condition, and lead-lag logic produce different flow, cycling, and operating-point trajectories among pumps.","The supervisory controller maintains stable total flow or header pressure by staging members and adjusting their commands.","Summed flow and common-header pressure preserve the station-level delivery state while discarding which pumps supplied it, how often they started, and where each operated on its curve.","A persistent lead role, low-flow residence, frequent cycling, or unfavorable load sharing can therefore remain invisible while the station macro indicator stays within its accepted band.","Hidden member-level duty concentration can consume maintenance margin or create a latent loss of redundancy without disproving the valid station-level equilibrium.","A micro-macro crosswalk and relevance-qualified member alerts can distinguish beneficial asymmetric dispatch from consequential duty concentration.","A reviewer-approved staging policy can then allocate roles using pump-specific risk budgets while retaining station pressure, flow, reserve capacity, and existing protections.","Monitoring both station stability and pump trajectories tests whether redistribution relieves the flagged member without transferring harmful duty to another pump."],"cell_id":"ensemble_and_population_level_equilibrium_versus_individual_level_heterogeneity__engineering_design","consequence":"A station can continuously satisfy its aggregate hydraulic criterion while one pump accumulates disproportionate starts, low-flow exposure, vibration, or operating time, leaving equipment-specific maintenance risk and reduced effective redundancy hidden until an alarm, inspection finding, or unavailability event.","diversity_from_prior_proposals":"This opportunity concerns hydraulic duty allocation among parallel rotating machines, not cell-temperature exposure within a battery. Its affected problem is hidden pump-specific wear beneath stable station delivery; its intervention is risk-aware lead-lag staging; and its causal path runs through pump curves, shared-header control, cycling, and redundancy rather than heat generation, coolant distribution, and local thermal balancing.","experiment_id":"eoa_inverse_innovation_exp13_second_slot_policy60_20260806","intervention":"Add a heterogeneity-aware staging layer to parallel-pump design validation. Define the available pumps in a declared demand regime as the ensemble and retain total flow plus shared-header pressure as the macro equilibrium indicators. Reconstruct each pump's starts, run duration, inferred flow, speed, distance from its approved preferred operating region, recirculation exposure, vibration, temperature, and control role. Document how member flows and availability produce the station indicators and classify heterogeneous duty using predeclared reliability and safety criteria. In offline replay, compare the approved staging policy with a constrained risk-budget policy that rotates lead status or changes staging order only when doing so preserves required delivery, reserve capacity, operating envelopes, and all existing protections. Any field trial requires change-board approval and simultaneous monitoring of macro stability and every participating pump's trajectory.","mechanism_mapping":[{"counterfactual_removal":"Without the joint display, stable header performance and concentrated member duty remain separate records and may not be interpreted together.","mechanism_slug":"distributional_dashboard","role":"Displays station flow and pressure beside pump-level starts, run time, operating-point residence, vibration, temperature, and control-role persistence."},{"counterfactual_removal":"Without the translation rule, reviewers cannot determine how different pump contributions and unavailable members combine into the accepted station state.","mechanism_slug":"micro_macro_crosswalk","role":"Links individual pump commands, inferred flows, states, and reserve status to summed flow, shared-header pressure, and station redundancy."},{"counterfactual_removal":"Without decomposition, demand-regime effects, deliberate asymmetric dispatch, controller preference, hydraulic mismatch, and condition-related behavior remain conflated.","mechanism_slug":"variance_decomposition_table","role":"Separates duty variation by demand regime, pump identity, control role, branch hydraulics, time window, and measurement uncertainty."},{"counterfactual_removal":"Without relevance-qualified alerts, hard alarms remain the only member-level trigger, while benign specialization may be mistaken for a fault.","mechanism_slug":"subgroup_excursion_alert","role":"Flags persistent pump-specific duty-budget or operating-envelope concerns while requiring contextual checks for efficiency, condition, and reserve obligations."},{"counterfactual_removal":"Without constrained ensemble replay, a proposed rotation rule could destabilize the header, increase starts, or merely transfer adverse duty between pumps.","mechanism_slug":"agent_based_or_ensemble_simulation","role":"Replays pump curves, controller decisions, demand sequences, and member availability to compare macro delivery and the distribution of pump trajectories before authorization."}],"nearest_rivals":["A station-capacity expansion intended to correct inadequate total flow or unstable discharge pressure; this proposal starts from an accepted station-level delivery state.","A generic run-hour equalization rule that treats all pump-to-pump variation as undesirable instead of testing whether asymmetric dispatch is functional or harmful.","A pump-condition-monitoring program that predicts individual faults without relating member trajectories to the stable ensemble-level hydraulic state.","An aggregation-bias correction that replaces total flow or header pressure because the macro indicator is invalid; here those indicators may remain valid for station delivery but incomplete for pump-level reliability.","A protection-system redesign that changes trips or emergency shutdown behavior rather than revising ordinary staging under existing protections."],"negative_tests":{"intervention_falsifier":"The proposed staging intervention is falsified if constrained offline replay and an authorized bounded trial show that risk-aware role rotation cannot reduce the predeclared member-level excursion without degrading pressure stability, required flow, reserve capacity, total starts, energy constraints, or another pump's duty profile.","problem_falsifier":"The inferred problem is falsified if synchronized records show no persistent pump-specific duty concentration beyond measurement uncertainty and declared functional specialization, or if the existing acceptance process already enforces pump-level trajectory and duty-budget criteria alongside station flow, pressure, and redundancy.","risks":["Inferred individual flow may be unreliable when only common-header instrumentation is available.","Sensor drift or inconsistent timestamps may create false pump-specific patterns.","Rotating lead duty can add starts, reduce hydraulic efficiency, or move unfavorable operation to another pump.","A condition-aware policy can inadvertently keep a degraded pump in service longer unless existing availability and protection rules remain authoritative.","Historic demand may omit operating regimes that determine staging safety.","Detailed member comparisons may invite unsupported blame toward operators, maintainers, or vendors.","Additional control complexity may make operator response or failure diagnosis harder."],"strongest_counterevidence":"Observed duty asymmetry may be an intentional consequence of pump efficiency, equipment condition, maintenance scheduling, or reserve strategy, and existing hard protections plus preventive maintenance may already bound its consequences; either result would weaken the case for staging-policy change."},"next_evidence_step":"Select one existing parallel-pump station and freeze the ensemble membership, demand-regime definitions, macro stability bands, aggregation rule, pump-level uncertainty bounds, functional-specialization rules, and excursion criteria before reviewing outcomes. Using read-only historical data, reconstruct synchronized station and pump trajectories, then run the approved policy and one constrained risk-budget policy in offline replay. The bounded decision is only whether the evidence warrants change-board review of an instrumented field trial.","observable_state":"Across repeated periods in a declared demand regime, total discharge flow and shared-header pressure remain inside their accepted stability bands while pump-level records may show persistent concentration of lead status, starts, run time, low-flow residence, speed, vibration, temperature, or distance from the preferred operating region. Observable inputs include pump identity, command and availability state, motor current or power, speed, suction and discharge pressure, individual or inferred flow, valve state, vibration, bearing temperature, alarm history, demand regime, and reserve requirement.","prior_art_status":"UNSEARCHED","problem":"A parallel-pump station is judged healthy because total discharge flow and shared-header pressure remain stable. That valid station-level conclusion is treated as though each pump experiences an acceptable duty trajectory. Shared-header control can instead conceal persistent concentration of starts, low-flow operation, unfavorable curve position, or lead duty in particular pumps, because other members compensate and keep the aggregate hydraulic state stable.","proposal_index":2,"remaining_contrastive_claim":"A valid and stable station flow-pressure state can remain appropriate for service-level control while being insufficient evidence of acceptable pump-specific duty; persistent member excursions should therefore trigger a constrained review of staging allocation rather than rejection of the macro indicator, indiscriminate run-hour equalization, or weakening of protection rules.","revision_record":{"claim_changes":[],"conceptual_changes":[],"evidence_changes":[],"operational_changes":[],"parent_version":null,"progress_targets_addressed":["Defined parallel pumps as the ensemble, station flow and pressure as the macro equilibrium, and pump duty trajectories as the heterogeneous microstates.","Specified an inspectable aggregation rule and a boundary between station-delivery claims and pump-reliability claims.","Provided a reviewer-gated, risk-aware staging intervention that preserves functional heterogeneity and existing protections.","Added falsifiers, counterevidence, risks, rollback conditions, and a read-only first evidence step."]},"schema_version":1,"structural_mapping":[{"archetype_element":"Ensemble Frame","domain_realization":"All available parallel pumps assigned to one station service group during predeclared demand regimes and analysis windows."},{"archetype_element":"Macro Equilibrium Indicator","domain_realization":"Stable total discharge flow and shared-header pressure, with required reserve capacity, over each declared operating regime."},{"archetype_element":"Microstate Variability Profile","domain_realization":"Pump-specific starts, run duration, speed, inferred flow, operating-curve position, recirculation exposure, vibration, temperature, availability, and lead-lag trajectories."},{"archetype_element":"Aggregation Translation Rule","domain_realization":"Individual pump flows sum into station delivery while all active members experience the common header; the macro indicators discard member identity, cycling history, operating-point residence, and contribution to reserve."},{"archetype_element":"Level-of-Analysis Boundary","domain_realization":"Station flow and pressure support a claim about hydraulic service only, not acceptable duty for every pump. A member excursion likewise does not by itself disprove station-level equilibrium."},{"archetype_element":"Heterogeneity Relevance Test","domain_realization":"Compare member differences with sensor uncertainty, approved pump envelopes, starts and duty budgets, condition evidence, efficiency differences, maintenance roles, and redundancy obligations before classifying them as functional or actionable."},{"archetype_element":"Subgroup and Locality Map","domain_realization":"Partition trajectories by pump identity, branch position, lead or lag role, demand regime, maintenance state, and time window to locate persistent duty concentration."},{"archetype_element":"Multi-Level Feedback Design","domain_realization":"Retain station-level pressure and flow control while adding pump-level duty review and a change-board-gated staging adjustment."},{"archetype_element":"Representative Case Guardrail","domain_realization":"Do not use one lead pump, one alarmed pump, or a fleet-average run-hour value as a substitute for the synchronized distribution across all available members."},{"archetype_element":"Equity or Risk Threshold","domain_realization":"Use predeclared equipment-specific operating-envelope, cycling, vibration, temperature, and maintenance-margin criteria rather than assuming equal duty is inherently desirable."}],"title":"Risk-Budgeted Staging for Parallel Pumps Beneath Stable Station Delivery","version":0}