A failing bearing, a hissing air leak and a valve that won't quite seal have one thing in common: they're all making noise you can't hear. Friction, turbulence and leakage all produce high-frequency sound above the range of the human ear — and that's exactly what ultrasound testing listens for. Point a detector at a bearing, an air line or a closed valve and the fault announces itself, often weeks before vibration, heat or a pressure drop would. This guide covers what ultrasound testing maintenance finds and how to turn those findings into action — start a free trial to log and track them in HVI.
Hear the fault before anyone else can.
Ultrasound testing detects bearing wear, compressed-air leaks and passing valves from the high-frequency sound they make — early, and in a noisy plant. HVI is where those findings become tracked defects, work orders and a survey history you can trend.
Ultrasound testing is one of the most versatile tools in condition-based maintenance because a single handheld detector covers three completely different problems — mechanical, pneumatic and process — all through the same principle: faults make high-frequency sound, and the detector translates it into something you can hear and measure. In a mine plant full of ambient noise, that directional, high-frequency signal cuts through where other senses can't. Here's what it finds, why it finds it first, and how a finding becomes a fix.
The three jobs of ultrasound testingbearings, leaks and valves — one detector, three wins
Most condition-monitoring tools do one thing. Ultrasound earns its place because the same survey can find a dry bearing, a costly air leak and a passing valve on the same walk through the plant.
Bearings & lubrication
Friction from a dry or early-failing bearing shows up in ultrasound well before heat or vibration. It also guides greasing — listen while you grease and stop at the right point, avoiding the over-greasing that kills as many bearings as under-greasing.
Compressed-air & gas leaks
A leaking fitting turns escaping air into turbulence that makes ultrasound. Compressed air is one of the most expensive utilities in a plant, so finding and tagging leaks is a direct, measurable energy saving — often the fastest payback of any survey.
Passing valves & steam traps
A valve that looks shut but passes fluid internally makes turbulence you can hear from outside. Ultrasound finds leaking isolation valves and failed steam traps that quietly waste energy and skew process control.
Three problem families, one survey — which is why ultrasound is a backbone of a predictive maintenance program. It complements the electrical view from motor current signature analysis: ultrasound hears friction and leaks, MCSA reads the motor's current. Start free and log survey findings per asset →
Why ultrasound catches it firstthe earliest warning on the failure curve
Every failure follows a curve from first detectable sign to functional failure. The earlier on that curve you catch it, the more lead time you have — and ultrasound detects friction and leakage at the very start, earlier than vibration, heat or the naked ear.
Catching a fault at the ultrasound stage means weeks or months of lead time to plan a repair instead of reacting to a breakdown. But the lead time only counts if the finding is captured and scheduled — an early warning nobody acts on is just an earlier surprise. That's where the survey has to connect to the maintenance system. Book a walkthrough to see findings turned into planned work →
The leak survey pays for itselfcompressed-air leak detection is the fastest-return ultrasound job
Of everything ultrasound does, compressed-air leak detection is usually the easiest win to justify. Compressed air is expensive to make, leaks run 24/7, and they're invisible — so a single survey can find a running cost that's been bleeding for years.
Leaks run unseen
- Air leaks waste compressor energy around the clock
- Nobody can see or hear them in a noisy plant
- Compressors run harder to hold pressure
- The cost hides inside the power bill
Leaks found & fixed
- Each leak located, tagged and logged
- Repairs raised as work orders and closed out
- Compressor load — and the power bill — drops
- A re-survey keeps new leaks from creeping back
The savings are real only if the leaks get fixed and don't quietly return — which takes a tracked list and a repeat survey, not a one-off walk. HVI holds the tagged findings, turns them into work orders and schedules the next survey, the same way it runs the rest of your mining plant maintenance. Start free and track your leak list to closure →
Ultrasound survey tracking in HVIthe condition record a reliability team builds survey by survey
This is what makes surveying worthwhile: each finding — bearing, leak or valve — with its severity, the work order against it and the re-survey date, so a program builds history instead of repeating the same walk and losing the results.
Instead of findings scattered across survey reports, the team has every bearing, leak and valve with its action and trend — so a program compounds in value instead of resetting each round. That history is what analytics and reporting builds from, and you can book a walkthrough to see this survey log on your own plant.
Ultrasound survey checklistthe condition-monitoring routine that keeps the plant ahead of failure
Ultrasound works best as a repeatable route around the plant, not a one-off. Here's a baseline survey checklist, grouped the way HVI loads it, each finding recorded against the asset.
- Bearing readings taken at the same points
- Reading compared to the asset's baseline
- Greasing guided by sound, not a fixed shot count
- Rising trend flagged for re-check
- Compressed-air lines & fittings surveyed
- Each leak located & physically tagged
- Severity estimated for repair priority
- Leak logged to the air-system record
- Isolation valves & steam traps checked for passing
- Finding logged on the asset record
- Flagged fault raised as a work order
- Next survey scheduled on the route
On paper the survey result scatters across reports and the trend never forms; in HVI each finding is logged to the asset, a fault becomes a work order, and the next survey is scheduled so the history builds. Start free and load your ultrasound survey route →
From a mine reliability technician
The first air-leak survey we did paid for the detector in a week — we found leaks that had been running so long nobody questioned them. But the surveys that didn't get tracked were almost worthless; we'd fix a few, forget the rest, and the same leaks would be back next year.
Putting every finding into the system — leaks, bearings, passing valves — with a work order and a re-survey date is what made it a program instead of a day out with a gadget. Now the bearing trends tell me which idlers to watch, and the leak list actually gets closed out.
Ultrasound testing maintenance — FAQs
What is ultrasound testing in maintenance?
It's a condition-monitoring technique that detects faults from the high-frequency sound they make — above human hearing. A handheld detector translates friction, turbulence and leakage into an audible, measurable signal, so bearings, air leaks and passing valves can be found early and non-intrusively.
What can ultrasound testing detect?
Three main families: bearing and lubrication faults (including guiding greasing by sound), compressed-air and gas leaks, and passing valves and failed steam traps. One survey with one detector can cover mechanical, pneumatic and process problems across the plant.
Why is ultrasound good for compressed-air leaks?
Escaping air creates turbulence that produces ultrasound, so a detector pinpoints leaks that are invisible and inaudible in a noisy plant. Compressed air is expensive and leaks run constantly, so finding and fixing them is often the fastest-paying survey a plant can do.
Does ultrasound replace vibration analysis?
No — they work together. Ultrasound detects friction and lubrication issues earliest and does leaks and valves too; vibration analysis characterizes mechanical faults in detail as they develop. A strong program uses both and records the findings against the same assets so the condition picture is complete.
Does HVI perform the ultrasound testing itself?
No. HVI isn't an ultrasound detector or analyzer — it's the maintenance system that records survey findings, turns a flagged leak, bearing or valve into a work order, schedules the re-survey, and keeps each asset's condition history so the survey actually prevents failures and recovers energy.
Turn what you heard into what you fixed
HVI is where ultrasound and condition-monitoring findings become action — each bearing, leak and valve logged on the asset, raised as a work order, re-surveyed on schedule and trended over time — so the fault you heard is the failure you prevented. Live on your plant in under two weeks.
No credit card · Works offline in the plant · Survey records ready on day one
