Product
Ingersoll Rand 47722477001 Air Filter Element | Centrifugal MSG TURBO-AIR / Centac
Replacement inlet air filter element for Ingersoll Rand centrifugal compressors (MSG TURBO-AIR / MSG Centac), part number 47722477001, item model code P675. Cellulose pleated media rated 5–10 μm at ≥98% efficiency, -10 to +80 °C, 2000-hour or 3-month service interval. Verify by part number before ordering.
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Product Overview
47722477001 is the inlet air filter element for Ingersoll Rand centrifugal air compressors. It mounts inside the compressor's intake filter assembly, upstream of the centrifugal impeller inlet. As ambient air is drawn in, dust, grit and fibres are captured before they reach the impeller and interstage coolers. This element is the first barrier in the air path — the impeller downstream is a high-speed rotating component, and deposited dust causes dynamic balance drift, so intake filtration condition directly affects rotor stability and maintenance cost.
The part belongs to the Ingersoll Rand centrifugal (CC) product line, with item model code P675 and unit group designation C675. Centrifugal units are 100% oil-free by design (ISO 8573-1 Class 0). With no lubricating oil in the compression chamber to carry contaminants away, particles settle on impeller and cooler surfaces, so intake filtration demands are higher than on oil-flooded screw compressors.
| Item | Value |
|---|---|
| Part number | 47722477001 |
| Description | Air Filter Element |
| Brand | Ingersoll Rand |
| Application | Ingersoll Rand centrifugal compressors (MSG TURBO-AIR / MSG Centac series) and packaged systems |
| Product line | Centrifugal (CC) |
| Filtration rating | 5–10 μm |
| Filtration efficiency | ≥98% for particles ≥5 μm |
| Recommended service interval | 2000 hours or 3 months |
Technical Specifications
Filtration Performance
| Parameter | Value / Notes |
|---|---|
| Filtration rating | 5–10 μm |
| Filtration efficiency | ≥98% for particles ≥5 μm |
| Filter class | Characterised per ISO 5011 by efficiency, restriction and dust holding capacity; HVAC ventilation classes (G4/F7 etc.) do not apply |
| Dust holding capacity | — |
Flow and Restriction
| Parameter | Value / Notes |
|---|---|
| Rated air flow | Must exceed unit rated intake flow; match after correcting for discharge volume, inlet temperature and altitude |
| Initial pressure drop | Approx. 0.3–0.5 kPa when new and clean |
| Operating differential range | Rises with dust loading; typical operating range approx. 0.5–1.5 kPa |
| Alarm / final restriction | Typical replacement threshold approx. 1.5–2.5 kPa; on centrifugal units the intake depression gauge reading is the final criterion |
| Restriction vs. energy | Each 1 kPa increase in intake restriction raises compression ratio by approx. 1% and unit energy consumption by approx. 1.0% |
Restriction vs. energy detail (theoretical compression ratio at 0.85 MPa discharge gauge pressure)
| Intake restriction | Compression ratio | Energy increase |
|---|---|---|
| 0 kPa (new element) | 9.39 | Baseline |
| 0.5 kPa | 9.44 | +0.5% |
| 1.0 kPa | 9.49 | +1.0% |
| 1.5 kPa | 9.53 | +1.5% |
| 2.0 kPa | 9.58 | +2.0% |
| 2.5 kPa | 9.63 | +2.5% |
From installation to replacement threshold, intake restriction climbs by more than 2 kPa and unit energy consumption rises by roughly 2%. Centrifugal units are high-power and typically run continuously, so this energy gap usually exceeds the price of the element itself — running to a calendar date rather than to a restriction reading is not economical.
Construction and Materials
| Parameter | Value / Notes |
|---|---|
| Filter media | Cellulose (wood-pulp fibre) filter paper, pleated construction |
| Media grammage | Approx. 130 g/m² |
| Inner / outer support | Galvanised steel perforated cage supporting the media on both faces |
| End caps | Metal or polyurethane end caps bonded to the media |
| Seal | Polyurethane or nitrile rubber seal, integral with or separate from the end cap |
| Bonding | Polyurethane adhesive securing and edge-sealing media to end caps and cage |
Operating and Service Parameters
| Parameter | Value / Notes |
|---|---|
| Operating temperature | -10 °C to +80 °C |
| Relative humidity | ≤90% RH, non-condensing |
| Burst / collapse resistance | Standard design withstands at least 5 kPa differential across the media without deformation |
| Service life | 2000 hours or 3 months, whichever comes first |
| High-dust environments | Reduce hours accordingly (e.g. approx. 1500 hours) and bring the time limit forward |
| Storage shelf life | Use within 24 months; store dry, ventilated and out of direct light, protected from moisture and crushing |
| Replacement criteria | Intake depression gauge reading out of limit, or media damage, debonding or flattened seal face |
Applicable Standards
| Standard | Notes |
|---|---|
| ISO 5011 | Inlet air cleaner efficiency and dust holding test method — the performance basis for this class of air filter element |
| ISO 8573-1 | Compressed air quality classes; the host units are Class 0 (100% oil-free) |
| Note | The ISO 2941 / 2942 / 2943 / 3723 / 3724 series often cited in replacement-part literature are hydraulic filter standards covering pressure, burst and filtration characteristics. They do not apply to air filter elements and should not be used as performance evidence for intake air filters. |
Installation and Maintenance Steps
Step 1 — Confirm unit status and spare. Check the unit nameplate model and group designation, and confirm the new element matches the old part number. Have the new element, lint-free cloths and required tools ready.
Step 2 — Shut down, depressurise, isolate. Follow the shutdown procedure and wait for full depressurisation (centrifugal units have rotational inertia — wait for the controller to confirm zero speed). Isolate the main power supply and apply lockout/tagout. This step is mandatory.
Step 3 — Verify the old element before dismantling. Before opening the intake filter assembly, read the part number stamped on the old element's end cap and note its installed position, then confirm it matches the ordered part. Intake-stage and clean-stage elements on centrifugal units carry different part numbers; this step is the key mistake-proofing check.
Step 4 — Remove and inspect the old element. Lift the old element out vertically and examine dust distribution and media condition. Replace immediately if the media is torn, perforated, debonded from the end cap or the seal face is flattened — even if the interval has not elapsed. A black oily film on the outer surface indicates abnormal oil mist in the intake; investigate the upstream environment (this is a particular red flag on oil-free units).
Step 5 — Clean the assembly interior. Wipe the inner walls and base with a lint-free cloth. Do not blow compressed air hard into the assembly — this drives dust into the intake duct. Criterion: no loose dust on the walls, seal face flat and free of debris.
Step 6 — Fit the new element. Install in the same orientation and position as the old element, paying attention to seal face direction and clamping method. Criterion: the element sits without movement and the seal face is evenly compressed around its circumference.
Step 7 — Refit and confirm sealing. Replace the cover or clamp and tighten evenly to the unit specification. Check that the intake depression gauge impulse line is clear — a blocked impulse line gives a false "clean" reading and is a common source of misdiagnosis.
Step 8 — Reset, test run, record. Reset the service timer, start the unit unloaded and observe the intake depression gauge and running sound. Criterion: gauge steady within the unit's permitted range with no abnormal whistling (whistling usually indicates seal bypass). Record the unit running hours at replacement as the starting point for the next interval.
Frequently Asked Questions
Q1: Which units use 47722477001?
Ingersoll Rand centrifugal air compressors — MSG TURBO-AIR and MSG Centac series and packaged systems (item model code P675, unit group designation C675). Centrifugal units are 100% oil-free by design. For a specific unit, confirm against the nameplate and the old element's part number.
Q2: Can it be fitted to an oil-flooded screw compressor?
Not recommended. This element belongs to the centrifugal product line, with dimensions and connections designed for centrifugal intake assemblies. Oil-flooded screw compressors use a different part number system; cross-fitting cannot guarantee sealing or filtration performance.
Q3: What is the replacement interval?
The standard interval is 2000 hours or 3 months, whichever comes first. In high-dust environments (cement, quarrying, mining, metalworking) reduce hours to approx. 1500. The intake depression gauge reading is the final criterion — replace when the reading exceeds the limit, regardless of running hours.
Q4: Why do centrifugal compressors demand more of intake filtration than screw compressors?
Centrifugal units are oil-free; there is no lubricating oil in the compression chamber to carry contaminants away, so particles deposit on the high-speed impeller and interstage cooler surfaces. Impeller fouling causes dynamic balance drift and typically requires a shutdown for rotor correction. Screw compressors have an oil film that carries some contaminants away, giving more tolerance in intake filtration.
Q5: Why are dimensions not listed?
Centrifugal units are supplied as project-specific packages; intake assembly dimensions vary between groups and package scopes within the same series, so quoting a single size would be misleading. We recommend measuring the old element's outer diameter, inner diameter, overall height and seal type, or supplying photos and the unit nameplate so we can cross-check by part number.
Q6: What happens if intake restriction rises?
First, energy consumption increases — each 1 kPa of added intake restriction raises compression ratio by approx. 1% and unit energy consumption by approx. 1%. Second, intake volume falls and discharge volume drops accordingly. Running past the replacement threshold costs more in electricity than the element saves.
Q7: Can alternative parts be used?
Yes, but three points must be verified: filtration rating, end cap seal type and dimensions. An alternative whose seal type does not match the original will bypass — on an oil-free centrifugal unit, bypass means particles reach the impeller directly, a higher risk than on oil-flooded units. Supply old-part photos and this part number when buying alternatives.
Q8: What if there is abnormal whistling after installation?
Whistling usually indicates seal bypass — the element is not fully seated, the seal face is deformed or the seal is missing. Shut down and recheck seating and seal face condition (flattened or rolled). Also check the intake depression gauge impulse line for blockage to avoid misdiagnosis.
Q9: How should spares be stored?
Store dry, ventilated and out of direct light, protected from moisture, rain and heavy loads. Moisture reduces media strength and compression deforms the sealing fit. Use within 24 months.
Q10: Which other elements in the same series are easily confused?
On the Ingersoll Rand centrifugal product line, the same unit often carries both an intake-stage element and a downstream clean-stage element, with different part numbers and mounting positions. Always confirm whether the intake or clean stage is required — filtration rating, materials and seal type differ between the two.
Compatible Units
This part is for Ingersoll Rand centrifugal air compressors as follows:
| Item | Detail |
|---|---|
| Unit type | Centrifugal air compressor |
| Product line | Ingersoll Rand centrifugal product line (CC) |
| Series | MSG TURBO-AIR / MSG Centac |
| Item model code | P675 |
| Unit group designation | C675 |
| Air quality class | 100% oil-free, ISO 8573-1 Class 0 |
| Typical applications | Processes requiring continuous, clean, oil-free air (food and beverage, pharmaceutical, electronics, textiles, pneumatic conveying) |
Representative model families (family-level reference only; individual fitment must be checked by serial number)
| Series | Representative models |
|---|---|
| MSG TURBO-AIR | TA / NX packaged units |
| MSG Centac standard pressure | C series (C400, C700, C800, C1000, C3000 and others) |
| MSG Centac high pressure | C750, C1050, 2CII, 3C, 4C and other high-pressure units |
| Packaged systems | Refrigerated dryers, filters, air receivers and other downstream equipment for the above units |
Why parts must be verified by part number rather than unit model
Centrifugal units are supplied as project-specific packages: intake assembly configuration, downstream scope and connection dimensions can differ for the same unit across projects; and a single unit carries both intake-stage and downstream clean-stage elements with different part numbers. Selection should therefore be based first on the part number on the old element itself, second on the unit nameplate, and third on the installed position.
Three-step verification
- Read the part number stamped on the old element's end cap or cage and compare it with the ordered part number.
- Read the model and group designation on the unit nameplate and compare with the unit parts manual.
- Confirm the old element's installed position (intake stage / clean stage) — the two are not interchangeable.
If the three steps are inconclusive, supply the unit nameplate photo, old-element photos (showing the stamped part number) and the installed position, and we will cross-check by part number.
Cross-series note: centrifugal unit elements and oil-flooded screw compressor elements belong to different part number systems and cannot be substituted across series. Screw compressor air filters are dimensioned and connected for external intake assemblies; direct substitution causes seal failure.
Related Components
In the intake and air path system of the Ingersoll Rand centrifugal product line, the following components are maintained on the same interval or in the same section:
| Component | Part number | Function | Inspection points |
|---|---|---|---|
| Sterile filter element | 47722478001 | Downstream sterile-grade filter element removing microorganisms and fine particles from compressed air for higher-purity applications | Different filtration stage from the intake element; part numbers are not interchangeable — confirm position at replacement |
| Air filter assembly (housing) | — | Housing assembly that carries and retains the intake element | Check clamps, seal faces and outlet end for deformation and corrosion |
| Intake depression gauge / differential gauge | — | Indicates intake restriction and is the final criterion for replacement | Periodically check the impulse line for blockage — blockage gives a false "clean" reading |
| Seals | — | Prevent bypass between element and assembly | Inspect together with the element; replace if flattened, hardened or missing |
| Unit lubricating oil and oil filter | — | For the centrifugal unit gearbox and bearing lubrication system (not compression chamber oil) | Replace per the unit parts manual interval; inspect at the same time as the intake element |
Paired replacement advice: inspect the intake element, downstream clean element and seals together, and decide each on its own criteria. The intake element and downstream clean element have different intervals (the downstream part is usually judged on cleanliness requirements rather than dust loading), so they need not be replaced together.
For specific part numbers: items marked "—" above should be taken from the unit-specific parts manual — centrifugal units are packaged per project, and the manual's companion part numbers correspond to the serial number of the application unit and should not be transferred between projects.