Compressed air and steam fail silently — a leak you can't hear at a joint, a steam trap blowing straight through to atmosphere, a valve passing behind a closed seat. The energy bleeds out for months while everything looks fine, because the failure is pitched too high for human ears. Ultrasound makes it audible: a leak or a failed trap has a signature in the 20–100 kHz range, and a dB reading turns "sounds okay" into a number you can trend. OXMAINT AI, the AI-powered CMMS, records those readings, trends them against baseline, and raises a work order the moment one crosses the line.
Industrial PdM · Ultrasound · Compressed Air & Steam · 2026
Ultrasound Predictive Maintenance for Compressed Air & Steam
Air leaks bleeding 20–30% of compressor output. Steam traps failed open, venting energy to the roof. Readings on a clipboard nobody trends. OXMAINT AI, the AI-powered CMMS and maintenance management software, runs the program on one platform: route-based ultrasound scans, dB readings trended against each asset's baseline, and any breach turned into a ranked work order — so the silent losses become findable, fixable and tracked.
1Scan Route
→
2dB Reading
→
3Threshold Breach
→
4Work Order
ULTRASOUND ROUTE · dB LOG
Header joint A-3+2 dB ✓
Drop leg B-7+4 dB ✓
Steam trap S-12+9 dB warn
Coupling leak C-4+14 dB WO
Bearing P-2baseline ✓
20–100 kHz
ultrasound range where leaks and trap failures sound off
20–30%
of compressor output typically wasted on undetected leaks
~$2,500/yr
wasted by a single ¼-inch compressed-air leak
8–12 wk
earlier bearing-fault warning than vibration analysis
Ultrasound Hears What Your Ears Can’t
Turbulent flow through a leak, gas blowing through a failed steam trap, a bearing starting to degrade — all of it generates high-frequency sound above what a person can hear. An ultrasound instrument shifts that signal down into the audible range and puts a decibel number on it, so a vague "sounds fine" becomes a measurement you can baseline and trend. OXMAINT AI stores that reading against the asset and watches it move. Start free and baseline your first assets in OXMAINT AI.
The Number That Turns Sound Into a Decision
Ultrasound only becomes predictive when the reading is compared to a known-good baseline. A rise of a few dB is normal drift; a bigger jump is a developing failure. These thresholds turn the trend into an action, and OXMAINT AI applies them to every reading on the route. Book a demo to see dB thresholds in OXMAINT AI.
BASELINE
Known-good reading
Recorded at healthy operating condition — the reference every future scan is measured against.
WARNING
+8 dB above baseline
A developing problem — triggers a warning notification so it goes on the radar before it worsens.
CRITICAL
+12 dB above baseline
A confirmed failure signature — generates an automatic work order to fix it, no manual triage.
The same logic runs in reverse for lubrication: ultrasonic-assisted greasing targets an 8–15 dB drop from the pre-lube reading, so bearings get exactly the grease they need — no more, no less.
What Ultrasound Finds Across Air & Steam
One instrument covers the failure modes that quietly drain a plant's energy and reliability budget. Each has a distinct ultrasonic signature, and OXMAINT AI logs findings by type so the recurring ones surface. Sign up free and log findings by type in OXMAINT AI.
Compressed Air & Gas Leaks
Turbulent flow at joints, couplings and fittings is audible without contact — and modern instruments estimate the leak's CFM from the dB reading.
Steam Trap Failures
Ultrasound tells an operating trap from a failed-open one blowing live steam straight through — the loss you can't see but can measure.
Valve Passing
A valve leaking internally behind a closed seat has a flow signature ultrasound picks up — catching passing that gauges miss.
Bearings & Electrical
Structure-borne contact catches bearing faults weeks early; airborne catches arcing, tracking and corona in switchgear.
Airborne vs Structure-Borne — Two Modes, One Tool
AIRBORNE
Non-contact scanning module picks up turbulent-flow noise in pressurized systems — leaks, steam traps, valve passing, electrical faults. Air-leak detection centers on the 38–42 kHz band.
STRUCTURE-BORNE
Contact probe couples to the equipment housing to read acoustic emissions from bearing raceways and mechanical components — degradation heard 8–12 weeks before vibration.
A Reading You Don’t Trend Is Just a Sound.
One dB number means little; the same point trended against its baseline over months is a failure caught early. OXMAINT AI keeps the baseline, watches every route reading against it, and turns a breach into a work order — so the program predicts instead of just measuring.
From Route Scan to Closed Work Order
The value isn't the meter — it's the chain from a reading to a verified fix, with the loss quantified along the way. OXMAINT AI runs that loop on every point on the route. Here's the flow. Start free and run this ultrasound loop in OXMAINT AI.
01
Walk the Route
Scheduled route-based scans cover headers, drops, traps, valves and bearings — the same points, the same way, every cycle.
↓
02
Log the dB Reading
Each point's reading is captured against the asset and compared to its baseline — a number, not a note.
↓
03
Trend & Flag the Breach
A +8 dB rise warns, +12 dB flags critical — and for a leak, the CFM and dollar-per-year loss are estimated from the reading.
↓
04
Raise the Work Order
A critical breach auto-generates a ranked work order routed to the right team — the fix is tracked, not just recorded.
↓
05
Re-Scan & Validate
A post-repair scan confirms the reading dropped back to baseline — a closed loop linking the fix to the detection.
What the CMMS Runs for the Ultrasound Program
An ultrasound gun finds a leak once; a CMMS turns it into a repeatable program — routed, trended, costed and closed. OXMAINT AI ties every reading to the asset your team already maintains. Book a demo to see the ultrasound program in OXMAINT AI.
ROUTE
Route-Based Scheduling
Recurring PM routes cover the same scan points on a cycle, so nothing on the header or trap network gets skipped.
TREND
dB Trending vs Baseline
Every reading compared to the asset's known-good baseline, with the history that makes a slow rise visible.
ALERT
Threshold Auto-Escalation
+8 dB warns and +12 dB raises a work order automatically — no reading sits interpreted-but-ignored.
COST
Leak Cost in Dollars
Leak findings are converted to a $/year figure, so the fix is prioritized by what it's actually costing.
LUBE
Ultrasonic-Guided Lubrication
Greasing to an 8–15 dB drop is logged per bearing, building the profile that prevents over- and under-greasing.
CLOSE
Closed-Loop Validation
Post-repair re-scans link the fix back to the detection, proving the reading returned to baseline.
“
We knew we had air leaks — every plant does — but 'we should survey for leaks' never turned into anything until it was a route in the system. Now a tech walks the compressed-air and steam lines on a schedule, the dB readings trend against baseline, and a leak or a failed trap past threshold becomes a work order with a dollar figure attached. The steam-trap survey alone found a dozen blowing straight through that we'd been paying to generate. It stopped being a one-time audit and became something that actually runs.
Reliability Engineer · Industrial Manufacturing Plant
Frequently Asked Questions
What can ultrasound predictive maintenance detect?
Compressed air and gas leaks, failed-open steam traps, valves passing internally, bearing degradation, and electrical arcing or corona — all of which emit high-frequency sound in the 20–100 kHz range. OXMAINT AI logs each finding by type against the asset.
Start free and start logging findings.
How do the dB thresholds work?
You record a baseline at known-good condition, then trend against it: a rise of about 8 dB triggers a warning and 12 dB or more generates an automatic work order. That turns a raw sound level into a clear action. OXMAINT AI applies the thresholds to every route reading.
Book a demo to see the thresholds.
How much do compressed air leaks actually cost?
A lot, quietly — around 80% of systems have undetected leaks wasting 20–30% of output, and a single quarter-inch leak can waste roughly $2,500 a year. OXMAINT AI estimates each leak's CFM and dollar cost from the reading so you fix the expensive ones first.
Start free and cost your leaks.
Is ultrasound better than vibration analysis for bearings?
It's complementary and earlier — structure-borne ultrasound often catches bearing degradation 8–12 weeks before vibration analysis, and the same instrument also handles leaks, steam traps and electrical faults. OXMAINT AI trends both ultrasonic and other PdM data per asset.
Book a demo to see PdM trending.
Why run the program in a CMMS instead of a standalone tool?
Because a gun finds a leak once; a CMMS routes the scans, trends readings against baseline, raises work orders on breaches, costs the leaks, and validates the fix with a re-scan. That closed loop is what makes ultrasound a program rather than an annual audit.
Start free and build the program.
Put a Number on the Losses You Can’t Hear.
Run ultrasound predictive maintenance on the OXMAINT AI maintenance management software — route-based scans, dB trending against baseline, automatic work orders on threshold breach, leak cost in dollars, and closed-loop validation across compressed air, steam and rotating equipment. Stop paying to generate energy that leaks straight out.
