Glossary
KPIs and measurements
Mean Time Between Failures
Also known as MTBF, mean time between failures.
MTBF (Mean Time Between Failures) is the average operating time between failures of repairable equipment. It is the headline reliability metric for industrial maintenance planning and a standard input to availability calculations.
Where MTBF matters in cleaning
Cleaning practice directly affects the MTBF of downstream equipment:
- Heavy steam-sootblower use shortens MTBF on the cleaned tubes by accelerating tube erosion
- ESP rapper breakage from sustained use shortens MTBF on rapper hardware
- Air cannons on silos can shorten MTBF on silo welds from fatigue
- Sonic horns, being non-contact and low-impact, have minimal MTBF impact on the cleaned equipment
Sonic-horn MTBF itself
Sonic horns are mechanically simple — usually a diaphragm or piston-whistle driver, a solenoid valve, and the bell horn. Typical MTBF of the horn assembly itself is 3–5 years of continuous duty before diaphragm replacement, with broader rebuild intervals beyond.
Related terms
Related terms
- Availability factorAvailability factor is the percentage of total hours that a plant is available to generate, whether or not it actually does. Distinguishes equipment readiness from market dispatch.
- Forced outageA forced outage is an unplanned shutdown of an industrial unit, typically triggered by equipment failure or pressure-vessel safety conditions. The dominant economic cost of poor cleaning practice.
- Predictive maintenancePredictive maintenance schedules service based on actual equipment-condition signals rather than fixed time intervals. Increasingly applied to sonic-horn cleaning systems via SPL trend monitoring.