Preventive & Predictive Maintenance Flashcards

On the P-F curve, what does the interval between point P and point F represent?

Answer: The time between a detectable potential failure and functional failure

The P-F interval is the warning window between when a failure becomes detectable (P) and when the asset can no longer perform its function (F).

As a general rule, how often should a condition-monitoring inspection be performed relative to the P-F interval?

Answer: At an interval shorter than the P-F interval, often about half of it

Inspecting at less than the P-F interval (commonly half) ensures the developing failure is caught before it becomes functional.

Which predictive technology is best suited for detecting loose or overheated electrical connections in a switchgear panel?

Answer: Infrared thermography

Loose or corroded connections create resistance and heat, which infrared cameras detect without contact.

Vibration analysis on a centrifugal pump shows a dominant peak at 1x running speed in the radial direction. What is the most likely cause?

Answer: Rotor imbalance

Imbalance typically produces a strong radial vibration peak at one times running speed.

A building maintenance manager wants to reduce PM labor without increasing failures. Which approach best fits this goal?

Answer: Shift time-based tasks with random failure patterns to condition-based monitoring

Time-based PM is ineffective for random failures, so condition-based tasks reduce wasted labor while still catching problems.

Which metric expresses the percentage of scheduled PM work orders completed within their allowed time window?

Answer: PM compliance

PM compliance measures how many scheduled PMs were completed on time versus scheduled.

A commonly used grace-period rule for PM compliance allows completion within what portion of the PM interval?

Answer: Within 10% of the interval

Many organizations use a 10% rule, so a 30-day PM must be completed within about 3 days of its due date.