Deferral
Definition
The postponement of a planned inspection, maintenance activity, or corrective action beyond its originally scheduled date. Deferrals require formal justification (typically an engineering assessment demonstrating that the deferred activity does not compromise safety or integrity), approval by authorized personnel, interim monitoring or compensating measures, and a firm rescheduled date. Deferrals are governed decisions tracked in the deferral register.
Context
Deferrals are common in practice due to turnaround scope constraints, production priorities, and resource limitations. However, they represent accepted risk and must be formally managed. In Reliatic, deferrals are tracked as governance events with approval workflows, compensating measures, and expiry dates.
Examples
- An internal inspection deferred from the 2026 turnaround to the 2027 turnaround is justified by an FFS assessment showing adequate remaining life, with enhanced external monitoring as a compensating measure.
- A corrective action deferral is approved with the condition that a temporary repair is installed and operational monitoring is increased from monthly to weekly until the permanent repair is implemented.
Applicable Standards
- API 510
- API 570
- ISO 55001:2014
Related Terms
A centralized log of all deferred inspections, maintenance activities, and corrective actions, tracking the original schedule, the deferral justification, the approval chain, compensating measures, the rescheduled date, and the current status. The deferral register provides visibility into the organization's deferred maintenance backlog and the associated accepted risk.
Governance EventA discrete, auditable event in the lifecycle of a governed artifact (asset, risk, MOC, inspection) that records a decision, approval, status change, or significant action. Governance events capture who did what, when, why, and with what authorization. They form the backbone of the audit trail and provide the evidence chain for regulatory compliance.
Fitness-for-Service(FFS)An engineering assessment methodology used to determine whether equipment with identified flaws, damage, or degradation can continue to operate safely and reliably for a defined future period. FFS evaluations quantify the remaining structural capacity of degraded equipment using the procedures in API 579-1/ASME FFS-1, considering the specific type and extent of damage relative to the design margins.
Risk AcceptanceA formal, documented decision to accept a specific risk without further treatment, based on a determination that the risk level is within the organization's risk tolerance criteria or that further risk reduction is not reasonably practicable (ALARP). Risk acceptance requires explicit authorization from a designated decision-maker, documented rationale, a defined review period, and specified conditions or limitations.
Turnaround PlanningThe comprehensive planning process for a major planned shutdown of a process unit or facility for inspection, maintenance, repair, and capital modification activities. Turnaround planning encompasses scope development, work list prioritization, resource planning, schedule optimization, logistics, safety planning, and post-turnaround recommissioning. Turnarounds are typically the single largest maintenance expenditure and the primary opportunity for internal inspection of fixed equipment.
Where this appears in Reliatic
This concept is used in the Governance module.