RUL is a reliability concept. It estimates how much longer an asset will perform its intended function before failure. RUL depends on condition, environment, duty cycle, maintenance quality, and failure modes. It is not the same as “years left on the depreciation schedule,” and it is not the same as OEM service life minus age.

GIS screening provides a broad, systemwide view. Field assessment provides detailed, segment‑specific insight. Together, they support better decisions, more predictable budgets, and clearer communication with governing boards.

RUL is a condition based estimate of how long the asset can continue to perform its intended function. It’s based on degradation, inspections, performance, and failure modes. RUL is used for maintenance, risk management, and operational planning, but has nothing to do with accounting or depreciation schedules.