Product
Ingersoll Rand 47722477001 Air Filter Element | MSG Centac Inlet Filter
Replacement inlet air filter element for Ingersoll Rand centrifugal compressors (MSG TURBO-AIR / MSG Centac), part number 47722477001, item-level model code P675 (group C675). 5–10 μm filtration, ≥98% efficiency, cellulose pleated media, -10 to +80 °C, 2000-hour or 3-month service interval.
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Product Overview
47722477001 is the inlet air filter element for Ingersoll Rand centrifugal air compressors. It mounts inside the intake filter assembly, upstream of the centrifugal impeller inlet. As process air is drawn in, dust, grit and fibers are captured by the filter media before reaching the impeller and intercoolers.
This element is the first barrier in the air path of a centrifugal machine. The impeller downstream is a high-speed rotating component, and dust build-up causes dynamic balance drift — so inlet filtration condition directly affects rotor stability and maintenance cost.
The part belongs to the Ingersoll Rand centrifugal product line (line code CC), item-level model code P675, group designation C675. Centrifugal machines are designed as 100% oil-free (ISO 8573-1 Class 0). With no lubricating oil in the compression chamber to carry contaminants away, particles deposit on impeller and cooler surfaces — so inlet filtration requirements are higher than for oil-flooded screw compressors.
Key Specifications
| 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 Parameters
Filtration Performance
| Parameter | Value / Note |
|---|---|
| Filtration rating | 5–10 μm |
| Filtration efficiency | ≥98% (for particles ≥5 μm) |
| Filter class | Characterized per ISO 5011 by efficiency, restriction and dust holding capacity; HVAC classification (G4/F7 etc.) does not apply |
| Dust holding capacity | — |
Flow and Restriction
| Parameter | Value / Note |
|---|---|
| Rated air flow | Must exceed machine rated inlet flow; select after correcting for discharge volume, inlet temperature and altitude |
| Initial pressure drop | Approx. 0.3–0.5 kPa with a clean new element |
| Operating differential range | Rises progressively with dust loading; typical range approx. 0.5–1.5 kPa |
| Alarm / final resistance | Typical replacement threshold approx. 1.5–2.5 kPa; on centrifugal machines the intake depression gauge reading is the final criterion |
| Pressure drop vs. energy | Each 1 kPa increase in inlet restriction raises compression ratio by approx. 1% and machine energy consumption by approx. 1.0% |
Pressure drop / energy relationship (theoretical, at 0.85 MPa discharge gauge pressure)
| Inlet 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 the replacement threshold, inlet restriction rises by more than 2 kPa and machine energy consumption increases by roughly 2%. Centrifugal machines are high-power and typically run continuously, so this energy penalty usually exceeds the price of the element itself — running on restriction rather than calendar time is not economical.
Construction and Materials
| Parameter | Value / Note |
|---|---|
| Filter media | Cellulose (wood pulp fiber) filter paper, pleated construction |
| Media basis weight | Approx. 130 g/m² |
| Inner / outer support | Galvanized steel perforated cages supporting the media on both sides |
| 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 for media-to-end-cap and media-to-cage fixing and edge sealing |
Operating Conditions
| Parameter | Value / Note |
|---|---|
| Operating temperature | -10 °C to +80 °C |
| Relative humidity | ≤90% RH (non-condensing) |
| Burst / collapse resistance | Standard design withstands a differential pressure across the media of not less than 5 kPa without deformation |
| Function | Inlet-stage filtration for oil-free centrifugal machines, working with the downstream clean filter element to maintain air quality |
Service Life and Storage
| Parameter | Value / Note |
|---|---|
| Service life | 2000 hours or 3 months, whichever comes first |
| High-dust environments | Reduce hours accordingly (e.g. approx. 1500 hours); bring the time limit forward as well |
| Storage shelf life | Use within 24 months recommended; store dry, ventilated and out of direct light, protected from moisture and crushing |
| Replacement criteria | Intake depression gauge reading over limit, or media damage, adhesive failure, or flattened seal face |
Applicable Standards
| Standard | Note |
|---|---|
| ISO 5011 | Inlet air cleaner efficiency and dust holding capacity test method — the performance basis for this type of air filter element |
| ISO 8573-1 | Compressed air quality classes; the complete machine is Class 0 (100% oil-free) |
| Note | The ISO 2941 / 2942 / 2943 / 3723 / 3724 series often cited for replacement parts are hydraulic filter standards covering pressure, burst and filtration characteristics and do not apply to air filter elements; they should not be used as air filter performance evidence |
Installation and Maintenance Steps
Step 1 — Confirm machine status and spare part. Check the machine nameplate model and group designation, and confirm the element matches the old part number. Have the new element, lint-free cloths and required tools ready.
Step 2 — Shut down, depressurize, isolate power. Follow the shutdown procedure and wait until the machine is fully depressurized (centrifugal machines 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 part before dismantling. Before opening the intake filter assembly, read the stamped part number on the old element end cap and note its mounting position to confirm it matches the replacement. Inlet-stage and clean-stage elements on centrifugal machines carry different part numbers; this step is the key error-prevention check.
Step 4 — Remove and inspect the old element. Lift the old element out vertically and examine dust distribution and media condition. Criteria: replace immediately if the media is torn, perforated, the end cap has debonded, or the seal face is flattened — even if the service interval has not been reached. 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 machines).
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 passage). Criteria: no loose dust on inner 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, observing seal face direction and clamping method. Criteria: element sits without movement and the seal face is evenly compressed around its circumference.
Step 7 — Reassemble and confirm sealing. Refit the cover or clamp and tighten evenly as specified. 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 misjudgment.
Step 8 — Reset, test run, record. Reset the maintenance timer, start the machine unloaded, and observe the intake depression gauge reading and running sound. Criteria: gauge stable within the machine's permitted range, no abnormal whistling (whistling often indicates seal bypass). Record machine running hours at replacement as the start of the next interval.
FAQ
Q1: Which machines use 47722477001?
Ingersoll Rand centrifugal air compressors — MSG TURBO-AIR and MSG Centac series and their packaged systems (item-level model code P675, group designation C675). Centrifugal machines are 100% oil-free by design. For a specific machine, confirm against the nameplate and the old part number.
Q2: Can it be used on an oil-flooded screw compressor?
Not recommended. This element belongs to the centrifugal product line, with dimensions and interface designed for centrifugal intake assemblies. Oil-flooded screw compressors use a different part number system; cross-use cannot guarantee sealing or filtration performance.
Q3: What is the replacement interval?
Standard interval is 2000 hours or 3 months, whichever comes first. In high-dust environments (cement, quarrying, mining, metalworking), reduce hours to approximately 1500. The intake depression gauge reading is the final criterion — replace when it exceeds the limit, regardless of running hours.
Q4: Why is inlet filtration more critical on centrifugal machines than on screw machines?
Centrifugal machines are oil-free; with no lubricating oil in the compression chamber to carry contaminants away, particles deposit on the high-speed impeller and intercooler surfaces. Impeller fouling causes dynamic balance drift and requires a shutdown for rotor correction. Screw machines have an oil film that carries some contaminants away, so inlet filtration tolerance is relatively higher.
Q5: Why are dimensions not listed?
Centrifugal machines are supplied as project-specific packages; intake assembly dimensions vary between groups and package scopes within the same series, so stating a single dimension could mislead buyers. We recommend measuring the old element's outer diameter, inner diameter, overall height and seal type, or providing photos of the old part and the machine nameplate so we can cross-check by part number before confirming.
Q6: What happens when inlet restriction rises?
First, energy consumption increases — each 1 kPa rise in inlet restriction raises compression ratio by about 1% and machine energy consumption by about 1%. Second, inlet flow drops, reducing machine discharge volume. Running past the replacement threshold costs more in electricity than the element saves.
Q7: Can an alternative part be used?
Yes, but three points must be verified: filtration rating, end cap seal type, and dimensions. If an alternative's seal type does not match the original, bypass occurs — on an oil-free centrifugal machine, bypass means particles reach the impeller directly, a higher risk than on oil-flooded machines. When sourcing alternatives, provide a photo of the old part and this part number.
Q8: What if there is abnormal whistling after installation?
Whistling usually indicates seal bypass — the element not fully seated, a deformed seal face, or a missing seal. Stop the machine immediately and recheck: element seating and whether the seal face is flattened or rolled. Also check the intake depression gauge impulse line for blockage to avoid misdiagnosis.
Q9: How should spare elements be stored?
Store dry, ventilated and out of direct light, protected from moisture, rain and heavy loads. Moisture reduces media strength, and compression deformation damages the seal fit. Use within 24 months recommended.
Q10: Which elements in the same series are easily confused?
In the Ingersoll Rand centrifugal product line, a single machine often carries both an inlet-stage and a downstream clean-stage element, with different part numbers and mounting positions. Always confirm whether the required element is inlet-stage or clean-stage — filtration rating, materials and seal type differ between the two.
Compatible Machines
This element is suitable for Ingersoll Rand centrifugal air compressors:
| Item | Content |
|---|---|
| Machine type | Centrifugal air compressor |
| Product line | Ingersoll Rand centrifugal product line (CC) |
| Series | MSG TURBO-AIR / MSG Centac |
| Item-level model code | P675 |
| Group designation | C675 |
| Air quality class | 100% oil-free, ISO 8573-1 Class 0 |
| Typical applications | Continuous, clean, oil-free air supply (food and beverage, pharmaceutical, electronics, textiles, pneumatic conveying, etc.) |
Representative model families (family-level reference; individual fitment must be verified by serial number)
| Series | Representative models |
|---|---|
| MSG TURBO-AIR | TA / NX packaged units |
| MSG Centac standard pressure | C series (C400, C700, C800, C1000, C3000, etc.) |
| 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 machines |
Why verification must be by part number, not machine model
Centrifugal machines are supplied as project-specific packages: intake assembly configuration, downstream equipment scope and interface dimensions can differ between projects for the same machine model, and a single machine carries both inlet-stage and downstream clean-stage elements with different part numbers. Selection should therefore be based first on the part number stamped on the old element, second on the machine nameplate, and third on the mounting position.
Three-step verification
- Read the part number stamped on the old element end cap or cage and compare it with the part number being ordered;
- Read the model and group designation on the machine nameplate and compare with the machine parts manual;
- Confirm the old element's mounting position (inlet stage / clean stage) — the two are not interchangeable.
If the three steps still do not confirm fitment, provide a photo of the machine nameplate, a photo of the old element (including the stamped part number) and a note on mounting position; we will cross-check by part number and confirm.
Cross-series note: Centrifugal machine elements and oil-flooded screw machine elements belong to different part number systems and cannot be cross-applied. Screw compressor air filter dimensions and interfaces are designed for external intake assemblies; direct substitution will cause seal failure.
Related Parts
Components in the intake and air path of the Ingersoll Rand centrifugal product line that are maintained on the same cycle or in the same section:
| Component | Part number | Function | Inspection points |
|---|---|---|---|
| Sterile filter element | 47722478001 | Downstream sterile-grade filter element that further removes microorganisms and particles from compressed air for higher air-quality applications | Belongs to a different filtration stage from the inlet element; part numbers are not interchangeable — confirm mounting position at replacement |
| Air filter assembly (housing) | — | Housing assembly that holds and locates the inlet filter element | Check clamps, seal faces and outlet end for deformation or corrosion |
| Intake depression gauge / differential pressure gauge | — | Displays inlet restriction; the final criterion for the replacement interval | 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 |
| Machine lubricating oil and oil filter | — | For the gearbox and bearing lubrication system of centrifugal machines (not compression chamber oil) | Replace per the intervals in the machine parts manual; inspect at the same time as the inlet element |
Recommended companion checks: inspect the inlet element, downstream clean element and seals at the same time, and decide replacement for each against its own criteria. Inlet and downstream clean elements have different replacement intervals (downstream parts are usually judged by cleanliness requirements rather than dust loading), so they do not have to be replaced together.
When specific part numbers are required: for items marked “—”, refer to the machine-specific parts manual supplied with the unit — centrifugal machines are packaged per project, and the companion part numbers listed in the manual correspond to the serial number of the applied machine; they should not be applied across projects.