Compressed air is the most expensive utility in most FMCG plants — and the most wasteful. A single 3mm leak wastes over 25,000 litres of compressed air per hour. Pressure drop across an unmaintained filter bank costs the equivalent of running a compressor at partial load continuously. OxMaint's Energy & Sustainability Tracking schedules every compressed air audit task automatically — leak detection, pressure drop analysis, dryer maintenance, and filter replacement logged and trended so energy waste is visible and actioned before it compounds. Book a free demo to see compressed air energy tracking in action.
Checklist · Energy & Sustainability · FMCG · 2026
Compressed Air System Audit and Maintenance Checklist
A complete audit and maintenance checklist for FMCG plant compressed air systems. Leak detection, pressure drop analysis, dryer maintenance, filter replacement, and energy optimisation — organised by daily, weekly, and monthly schedules so air quality, system pressure, and energy efficiency are always under control.
4
audit zones every FMCG compressed air system requires on a structured maintenance schedule
30%
of compressed air produced in a typical FMCG plant is lost through leaks in an unaudited system
100%
energy audit traceability — every pressure reading and leak finding timestamped and trend-tracked
Zero
missed audit intervals when OxMaint auto-schedules every compressed air task per shift and facility
Schedule:
Daily Pre-shift check every production day
Weekly Once per maintenance week
Monthly Full audit and energy review
Zone 1: Compressors
→
Zone 2: Dryers & Filters
→
Zone 3: Distribution & Leaks
→
Zone 4: Energy & Optimisation
Audit Coverage Across the 4 Compressed Air Zones
Every zone in a compressed air system contributes to energy cost and air quality. Compressor faults raise generation cost. Saturated dryers and blocked filters degrade air quality and increase pressure drop. Distribution leaks waste generated air before it reaches any point of use. Without structured audit data, none of these losses are visible — they accumulate silently in the energy bill. OxMaint captures every audit result and trends it over time so rising costs and degrading performance are caught before they reach critical levels.
Zone 1
Compressors
DailyOil level, temperature, and pressure check
WeeklyInlet filter and belt tension inspection
MonthlyFull compressor PM and oil analysis
Zone 2
Dryers & Filters
DailyDew point and condensate drain check
WeeklyFilter differential pressure measurement
MonthlyFilter element replacement and dryer service
Zone 3
Distribution & Leaks
DailySystem pressure and demand baseline check
WeeklyUltrasonic or soap-film leak survey
MonthlyFull distribution audit and pressure mapping
Zone 4
Energy & Optimisation
DailyCompressor load factor and kWh review
WeeklyPressure set point and control review
MonthlyFull energy audit and optimisation review
Before the Audit: Baseline and Asset Registration
A compressed air audit without a baseline is just a snapshot. To identify energy waste and degradation, teams need design-intent pressure values, original air quality specifications, compressor rated outputs, and historical energy consumption — all registered in the system before the first audit interval begins. OxMaint registers every compressor, dryer, filter, and distribution zone as a tracked asset before scheduling begins.
Pre-Audit: Asset Registration and Baseline Setup
All compressors, dryers, filters, and receivers registered with asset IDs
Every compressed air system component registered with make, model, rated output, design pressure, and installation date before audit scheduling begins.
Design-intent pressure, dew point, and air quality specifications recorded
System design pressure, dew point specification, and air quality class (ISO 8573-1) recorded per zone and point of use as deviation baselines for every audit task.
Baseline energy consumption and compressor load factor recorded
Baseline kWh per unit of production and compressor load factor (% loaded vs unloaded runtime) recorded so future audits can identify genuine efficiency degradation versus production volume change.
Filter replacement intervals and OEM service schedules configured
Filter element replacement intervals, oil service schedules, and dryer service frequencies set per OEM recommendation and linked to each asset in OxMaint before the audit schedule goes live.
ZONE 1
Compressors — Audit & Maintenance Checklist
The compressor is the single largest energy consumer in the compressed air system — typically 70–80% of the total system energy cost. Running a compressor with a blocked inlet filter, low oil level, or incorrect pressure set point increases energy cost per unit of air produced without any visible production impact. Audit compressor operating parameters at every shift start — deviations from baseline are energy waste in real time.
| # | Audit Task | Schedule | Acceptance Criteria | Sign-Off | |
|---|---|---|---|---|---|
| 1.1 | Oil level checked and topped up if below minimum. Condition assessed for discolouration or emulsification. Running hours confirmed against OEM oil change interval. | Daily | Oil level within min-max marks. No discolouration or emulsification. Hours to next oil change logged. Change triggered at OEM interval. | ________ | |
| 1.2 | Discharge temperature, inlet pressure, and discharge pressure recorded and compared against the baseline operating envelope for current conditions. | Daily | All parameters within baseline operating envelope. Discharge temperature above limit triggers investigation. Values logged and trended per shift. | ________ | |
| 1.3 | Load/unload cycle time monitored over 15 minutes. Short-cycling more than once per minute indicates receiver, demand, or leak issues requiring investigation. | Daily | Cycle time within normal operating range. Short-cycling rate above threshold triggers demand-side investigation. Cycle data logged. | ________ | |
| 1.4 | Inlet filter differential pressure measured against OEM replacement threshold. Blocked filters raise suction resistance and increase energy cost — replace at threshold regardless of appearance. | Weekly | Differential pressure below OEM replacement threshold. Replacement triggered at threshold regardless of visual appearance. Result logged per filter asset. | ________ | |
| 1.5 | Belt tension and condition inspected on belt-driven compressors. Checked for cracking, glazing, or fraying. Tension verified with gauge against OEM specification. | Weekly | Belt tension within OEM specification. No cracking, glazing, or fraying. Tension adjustment or replacement scheduled if out of spec. | ________ | |
| 1.6 | Full PM per OEM schedule: oil and filter change, separator element, valve condition, and safety relief valve test. PM record linked to asset in CMMS. | Monthly | All PM tasks completed per OEM specification. Safety relief valve tested and confirmed functional. Full PM record archived per compressor asset ID. | ________ | |
| 1.7 | Oil sample taken and submitted for lab analysis. Detects bearing wear, water contamination, and acid development before catastrophic failure occurs. | Monthly | Oil analysis result within acceptable wear metal and contamination limits. Any adverse finding triggers increased monitoring and maintenance review before next scheduled interval. | ________ |
Audit records: oil level, operating parameters, cycle time, inlet filter dP, belt condition, monthly PM, oil analysis — timestamped, technician-signed, OEM warranty and energy audit-ready
OxMaint Energy & Sustainability Tracking
Compressor audit tasks triggered automatically at every shift — oil levels, temperatures, and cycle times logged and trended per asset. OEM service intervals tracked by running hours, not calendar date. See how OxMaint tracks compressor energy data.
ZONE 2
Dryers & Filters — Audit & Maintenance Checklist
Wet or contaminated compressed air causes corrosion in distribution pipework, actuator seal degradation, product contamination at food-contact points, and microbial growth in air lines serving open-product zones. A saturated refrigerant dryer or a filter element at end-of-life produces air that looks the same pressure but degrades every component it contacts. Check dew point and filter differential pressure at every shift — never assume air quality without measurement.
| # | Audit Task | Schedule | Acceptance Criteria | Sign-Off | |
|---|---|---|---|---|---|
| 2.1 | Dew point checked on the dryer controller and recorded. Above-spec reading indicates saturation, refrigerant loss, or heat exchanger fouling — triggers immediate investigation. | Daily | Dew point at or below specification for the application class (typically +3°C or lower for refrigerant dryers). Above-spec reading triggers immediate dryer investigation. Logged per shift. | ________ | |
| 2.2 | All automatic condensate drains tested by observing or manually triggering the drain cycle. Failed drains allow liquid water into the distribution system — replace before next shift. | Daily | All condensate drains confirmed cycling and discharging. No drain found blocked or stuck open (which wastes air continuously). Failed drain replaced before next shift. | ________ | |
| 2.3 | Differential pressure measured across each filter stage — coalescing, particulate, and carbon. dP is the only reliable indicator of element condition; visual inspection is insufficient. | Weekly | Differential pressure below OEM replacement threshold for each filter stage. Threshold reached triggers element replacement regardless of visual condition. Results logged per filter. | ________ | |
| 2.4 | Desiccant condition and regeneration cycle confirmed for adsorption dryers. Dew point probe reading verified against controller display for accuracy. | Weekly | Desiccant confirmed active and regeneration cycle confirmed completing normally. Dew point probe reading within ±2°C of controller display. Desiccant replacement triggered per OEM schedule. | ________ | |
| 2.5 | All filter elements replaced per OEM interval with correct-grade elements. Housing o-rings and seals inspected and replaced where worn. Post-replacement dP confirmed at baseline. | Monthly | All elements replaced with correct-grade elements per OEM interval. Housing seals confirmed. Post-replacement differential pressure confirmed at baseline (near-zero). Logged per filter asset ID. | ________ | |
| 2.6 | Air quality spot-test at food-contact blow-off, open-product conveyors, and filling inlets. Oil vapour, moisture, and particulate tested against the required ISO 8573-1 class. | Monthly | Air quality at all tested points meets or exceeds the required ISO 8573-1 class. Any fail triggers immediate investigation of the upstream dryer and filter train. Results archived. | ________ |
Audit records: dew point, condensate drains, filter dP, desiccant condition, element replacement, air quality test — timestamped, technician and QA-signed, ISO 8573-1 and food safety audit-ready
30% of Air Is Lost Before Any Point of Use
Wet, contaminated air from a saturated dryer degrades every actuator and seal it contacts — and the energy cost of producing that air is paid regardless. OxMaint schedules dew point checks and filter dP measurements automatically, raising work orders when readings drift. See the dryer and filter audit workflow live.
ZONE 3
Distribution & Leak Detection — Audit Checklist
Distribution leaks are the silent budget drain of every compressed air system. A 1mm orifice at 7 bar loses approximately 1 litre per second — continuously, whether the plant is producing or idle. The overnight pressure decay test is the most accurate single indicator of total system leakage rate, and it costs nothing to perform. Any facility that doesn't run a weekly overnight decay test is operating with an unknown and uncontrolled energy loss.
| # | Audit Task | Schedule | Acceptance Criteria | Sign-Off | |
|---|---|---|---|---|---|
| 3.1 | System pressure at main header and key point-of-use locations recorded at shift start and end. Drop above design tolerance indicates distribution resistance requiring investigation. | Daily | Pressure drop from header to point of use within designed tolerance (typically <0.3 bar). Any reading above threshold triggers distribution investigation. Values trended daily. | ________ | |
| 3.2 | System isolated at end of shift. Initial pressure recorded and residual pressure measured after 8–12 hours. Pressure drop indicates total system leakage rate — results trended weekly. | Daily | Pressure decay below 0.3 bar over the test period for a well-maintained system. Decay above 0.5 bar indicates significant leakage requiring a zone-by-zone leak hunt. Results trended weekly. | ________ | |
| 3.3 | Ultrasonic leak survey across production areas — headers, branch connections, point-of-use fittings, and tool connections. Every leak tagged with location and estimated flow rate. | Weekly | All detected leaks tagged and logged with location, connection type, and estimated flow rate. Repair work orders raised immediately. High-flow leaks repaired within 24 hours. | ________ | |
| 3.4 | Pipe joints, compression fittings, and push-in connectors in high-vibration areas inspected visually and with soap solution. Vibration progressively loosens fittings over time. | Weekly | All fittings in high-vibration zones confirmed secure with no audible or visible leakage. Any loose or leaking fitting repaired and re-tested before the area returns to production. | ________ | |
| 3.5 | Full pressure map completed — pressure measured at each branch takeoff and point of use. Compared against design intent to identify sections with excessive drop. | Monthly | All pressure readings mapped and compared against design intent. Any section with drop >0.5 bar above design triggers pipework investigation. Pressure map archived monthly. | ________ | |
| 3.6 | All prior-month leaks confirmed repaired and re-tested. Total estimated flow rate before and after repairs calculated to quantify energy saving achieved. | Monthly | All prior-month leaks confirmed repaired and re-tested clean. Estimated annual energy saving from repairs calculated and reported. Outstanding repairs escalated with revised completion date. | ________ |
Audit records: header and point-of-use pressure, overnight decay test, ultrasonic leak survey, fitting inspection, pressure map, leak repair verification — timestamped, energy and maintenance-signed
100% Leak Detection Traceability
Every leak found, tagged, and repaired is logged in OxMaint against the distribution asset record with estimated flow rate and energy cost. Monthly repair effectiveness reports generated automatically — so the ROI of leak management is always visible. Book a demo to see energy saving tracking in OxMaint.
ZONE 4
Energy & System Optimisation — Audit Checklist
Every 1 bar of unnecessary system pressure costs approximately 7% in additional compressor energy. Most FMCG plants run their compressed air system at a higher pressure than any application actually requires — because no one has audited demand against supply since the system was commissioned. The energy optimisation zone is where audit data becomes cost reduction: lower the pressure to the minimum that meets the highest-demand application, and save the difference on every kilowatt-hour the compressor runs.
| # | Audit Task | Schedule | Acceptance Criteria | Sign-Off | |
|---|---|---|---|---|---|
| 4.1 | kWh recorded from energy meter and compared against the rolling 7-day production-adjusted baseline to detect unexplained energy increases. | Daily | kWh per unit of production within ±5% of 7-day baseline. Increase above threshold triggers demand-side and supply-side investigation. Logged daily per compressor. | ________ | |
| 4.2 | Load factor reviewed — percentage of time each compressor runs loaded vs unloaded vs idle. High unloaded running indicates sequencing or pressure band optimisation opportunity. | Daily | Load factor above 75% loaded indicates high demand. Unloaded running above 25% indicates optimisation opportunity. Both conditions logged and reviewed weekly. Action triggered above threshold. | ________ | |
| 4.3 | Pressure set point confirmed at the minimum required by the highest-demand application. Set point creep — upward drift caused by leaks or filter dP — identified and corrected. | Weekly | Pressure set point at minimum required by highest-demand application. Any unexplained set point increase triggers demand-side audit. Set point confirmed and logged weekly. | ________ | |
| 4.4 | Sequencing reviewed for multi-compressor installations. Trim compressor confirmed in load-following mode. No two compressors running simultaneously in unloaded mode. | Weekly | Sequencing confirmed correct with trim compressor load-following. No two compressors running simultaneously in unloaded mode. Sequencing logic confirmed per the energy management procedure. | ________ | |
| 4.5 | Monthly kWh and energy cost calculated. Cost per unit of production compared against prior month and annual target. Increases above 5% month-on-month trigger a full system investigation. | Monthly | Energy cost per unit of production at or below monthly target. Year-on-year comparison calculated. Any cost increase above 5% month-on-month triggers a full system investigation. | ________ | |
| 4.6 | Non-production air consumption measured and compared against acceptable standby level. Exceedance indicates open lines, failed drains, or leaking isolation valves — triggers a non-production leak audit. | Monthly | Non-production air consumption below acceptable standby level. Any exceedance triggers a leak and isolation valve audit during the next planned non-production window. | ________ | |
| 4.7 | Monthly optimisation review: three priority saving opportunities identified, action plan updated with owners and due dates, and year-to-date saving reported against annual target. | Monthly | Three priority opportunities identified and actioned. Year-to-date saving calculated and reported. Review signed by energy manager. Actions logged in OxMaint with assigned owners and due dates. | ________ |
Audit records: daily kWh, load factor, pressure set point, sequencing check, monthly energy cost, non-production demand, optimisation review — timestamped, energy manager-signed, sustainability and ISO 50001-ready
Audit Sign-Off — Issued When All 4 Zones Are Confirmed
1
Compressors
Audited ✓
Audited ✓
2
Dryers &
Filters ✓
Filters ✓
3
Distribution
& Leaks ✓
& Leaks ✓
4
Energy &
Optimisation ✓
Optimisation ✓
✓
Audit
Complete
Complete
AUDIT COMPLETE — COMPRESSED AIR SYSTEM REVIEWED
Any air quality failure at a food-contact point triggers immediate production hold pending investigation
High-flow leaks identified in the weekly survey must be repaired within 24 hours without exception
Pressure set point changes require energy manager sign-off and point-of-use verification
Every monthly audit record retained for ISO 50001, customer, and regulatory energy review
Performance Metrics — Compressed Air Audit Programme
Specific Energy Consumption
kWh per unit of production for compressed air generation. Trended monthly to identify genuine efficiency degradation versus production volume change — the only metric that separates energy performance from production output.
System Leakage Rate
Total estimated leak flow rate in litres per minute across the plant, calculated from overnight decay tests and ultrasonic surveys. Target below 10% of peak demand for a well-maintained FMCG system.
Pressure Drop Index
Average pressure drop from compressor discharge to highest-demand point of use. Rising pressure drop indicates filter, dryer, or distribution blockage and forces the compressor set point higher — compounding energy cost.
Air Quality Compliance Rate
Percentage of point-of-use air quality tests passing the required ISO 8573-1 class for each application. Any failure at a food-contact point is a quality and safety event requiring immediate corrective action.
30%
of compressed air produced in an unaudited FMCG plant is lost through leaks before reaching any point of use
7%
compressor energy saving for every 1 bar reduction in system pressure achieved through demand-side optimisation
Zero
missed audit intervals when OxMaint auto-schedules every compressed air task per shift and facility
Deploy This Checklist Digitally
Automated Audit Scheduling
Dew point checks, filter dP readings, and leak surveys triggered automatically at every defined interval per asset.
Energy Trend Alerts
kWh per unit trended daily — automatic alerts when energy consumption drifts above baseline before costs compound.
Leak Management Log
Every leak tagged, costed, and tracked to repair — monthly saving quantified automatically against the annual target.
ISO 50001 Audit Trail
Full energy audit record per system — retrievable for ISO 50001, customer, and sustainability reporting at any time.
Replace Manual Air Audits with OxMaint
OxMaint gives energy and maintenance teams a fully automated compressed air audit programme — compressor checks, air quality monitoring, leak surveys, and energy optimisation reviews scheduled, logged, and trended in one sustainability-ready record.
Trusted by FMCG plants across 40+ countries · ISO 50001 · ISO 8573-1 · Energy audit-ready
Frequently Asked Questions
What does this compressed air audit checklist cover?
Four audit zones: Zone 1 (Compressors — oil level, operating parameters, cycle time, inlet filter, belt condition, monthly PM, oil analysis), Zone 2 (Dryers and Filters — dew point, condensate drains, filter differential pressure, element replacement, air quality testing), Zone 3 (Distribution and Leaks — pressure drop, overnight decay test, ultrasonic leak survey, pressure mapping, repair verification), and Zone 4 (Energy and Optimisation — kWh tracking, load factor, pressure set point, sequencing, monthly energy cost, optimisation review). Each zone includes daily, weekly, and monthly tasks. Configure your compressed air audit schedule — free 14-day trial.
How does OxMaint track compressed air energy consumption and savings?
OxMaint logs daily kWh readings per compressor and calculates specific energy consumption (kWh per unit of production) to separate genuine efficiency changes from production volume variation. Leak repair work orders include an estimated flow rate field — OxMaint calculates the annual energy saving achieved from each repair and aggregates this into a monthly saving report against your annual target. Pressure set point changes are logged with before and after values, and the estimated energy impact is calculated automatically. Book a demo to see energy saving tracking in action.
How does OxMaint handle air quality compliance for food-contact applications?
OxMaint registers the required ISO 8573-1 air quality class per point of use — food-contact blow-off, open-product conveyors, filling system inlets — and schedules monthly quality tests against those requirements. Any test failure raises a critical work order, flags the affected production zone, and notifies the QA team per your escalation rules. The full air quality test record is stored per asset and instantly retrievable for food safety, GMP, and customer audit review.
How does the overnight pressure decay test work and what does it tell you?
At the end of each shift, the system is isolated from the compressors and the initial pressure is recorded. After 8–12 hours with no demand, the residual pressure is measured. The pressure drop over that period — combined with the known receiver volume — allows calculation of total system leakage rate in litres per minute. A well-maintained system loses less than 0.3 bar overnight. Any system losing more than 0.5 bar has significant leakage that warrants an immediate zone-by-zone leak hunt using ultrasonic detection.
Can OxMaint manage compressed air audits across multiple facilities?
Yes. OxMaint runs all four audit zones across multiple facilities simultaneously — applying the same inspection schedules, energy tracking, and leak management standards at every site. Energy managers see daily kWh trends, leak rates, filter differential pressures, and air quality results across all facilities in one dashboard. Monthly energy optimisation reports are generated per site and consolidated for group-level sustainability reporting. Start your free trial and deploy compressed air audit management today.
