Product
Ingersoll Rand 47722477001 Air Filter Element | MSG Centac Inlet Filter
Ingersoll Rand 47722477001 inlet air filter element for MSG TURBO-AIR and MSG Centac centrifugal compressors (part-level model code P675, group C675). 5–10 μm filtration rating, ≥98% efficiency, cellulose pleated media, -10 to +80 °C. Replacement interval 2000 hours or 3 months. Order by part number with full verification support.
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Product Overview
47722477001 is the inlet air filter element for Ingersoll Rand centrifugal air compressors. It is installed inside the compressor's inlet filter assembly, upstream of the centrifugal impeller intake. As ambient air is drawn in, dust, grit, and fibers are captured by the filter media before reaching the impeller and intercooler stages.
This element is the first barrier in the air path of a centrifugal compressor. Because the downstream impeller is a high-speed rotating component, dust accumulation can cause dynamic balance deviation. Inlet filtration condition directly affects rotor stability and maintenance cost.
This part number belongs to the Ingersoll Rand centrifugal product line (product line code CC). The part-level model code is P675, corresponding to compressor group identifier C675. Centrifugal compressors are designed as 100% oil-free (ISO 8573-1 Class 0). With no lubricating oil in the compression chamber to carry away contaminants, particles deposit on impeller and cooler surfaces — making inlet filtration requirements more demanding than for oil-flooded screw compressors.
Core Specifications
| Item | Value |
|---|---|
| Part Number | 47722477001 |
| Name | 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 Replacement | 2000 hours or 3 months |
Technical Parameters
Filtration Performance
| Parameter | Value / Notes |
|---|---|
| Filtration Rating | 5–10 μm |
| Filtration Efficiency | ≥98% (for particles ≥5 μm) |
| Filter Class | Characterized per ISO 5011 by efficiency, resistance, and dust holding capacity; ventilation/HVAC classification systems (G4/F7 etc.) do not apply |
| Dust Holding Capacity | — |
Flow and Pressure Drop
| Parameter | Value / Notes |
|---|---|
| Rated Air Flow | Must exceed compressor rated inlet flow; sized after correction for discharge volume, inlet temperature, and altitude |
| Initial Pressure Drop | Approx. 0.3–0.5 kPa (clean, new element) |
| Operating Differential Range | Rises progressively with dust loading; typical operating range approx. 0.5–1.5 kPa |
| Alarm / Final Resistance | Typical replacement threshold approx. 1.5–2.5 kPa; for centrifugal compressors, the intake depression gauge reading is the final criterion |
| Pressure Drop vs. Energy | Each 1 kPa increase in inlet resistance raises compression ratio by approx. 1%, increasing compressor energy consumption by approx. 1.0% |
Pressure Drop vs. Energy Consumption (theoretical calculation based on compression ratio, at 0.85 MPa discharge gauge pressure)
| Inlet Resistance | 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, inlet resistance rises by over 2 kPa, increasing compressor energy consumption by approximately 2%. Centrifugal compressors are high-power, typically continuous-duty machines — the energy cost of this differential often exceeds the price of the filter element itself. Extending service life by calendar rather than by resistance reading is not economical.
Materials of Construction
| Parameter | Value / Notes |
|---|---|
| Filter Media | Cellulose (wood pulp fiber) filter paper, pleated construction |
| Media Basis Weight | Approx. 130 g/m² |
| Inner / Outer Support | Galvanized steel perforated cage, supporting media on both sides |
| End Caps | Metal or polyurethane end caps, bonded to filter media |
| Seal | Polyurethane or nitrile rubber seal, integral with or separate from end cap |
| Adhesive | Polyurethane adhesive for media-to-end-cap and cage bonding and edge sealing |
Operating Conditions
| Parameter | Value / Notes |
|---|---|
| Operating Temperature | -10 °C to +80 °C |
| Relative Humidity | ≤90% RH (non-condensing) |
| Burst / Collapse Resistance | Standard design withstands differential pressure across media of not less than 5 kPa without deformation |
| Special Function | Inlet-stage filtration for oil-free centrifugal compressors; works with downstream clean filtration elements to maintain air quality |
Service Life and Maintenance
| Parameter | Value / Notes |
|---|---|
| Service Life | 2000 hours or 3 months, whichever comes first |
| High-Dust Environment | Reduce hours accordingly (e.g., approx. 1500 hours); time limit also shortened |
| Storage Shelf Life | Use within 24 months; store in dry, ventilated, light-protected area; avoid moisture and compression deformation |
| Replacement Criteria | Intake depression gauge reading exceeds limit, or media shows damage, adhesive failure, or compressed seal face |
Applicable Standards
| Standard | Notes |
|---|---|
| ISO 5011 | Inlet air filter efficiency and dust holding capacity test method — performance characterization basis for this type of air filter element |
| ISO 8573-1 | Compressed air quality classes; this compressor type is Class 0 (100% oil-free) |
| Note | ISO 2941 / 2942 / 2943 / 3723 / 3724 series commonly cited in replacement-part literature are hydraulic filter standards for pressure, burst, and filtration characteristics — not applicable to air filter elements. They should not be used as performance basis for air filters. |
Installation and Maintenance Procedure
Step 1: Confirm compressor status and spare parts. Verify the compressor nameplate model and group identifier, and confirm the replacement element matches the old part number. Prepare the new element, clean cloths, and necessary tools.
Step 2: Shut down, depressurize, and lock out. Follow the shutdown procedure and wait for complete depressurization (centrifugal compressors have rotational inertia — wait for the controller to confirm zero speed). Disconnect main power and apply lockout/tagout. This is a mandatory step.
Step 3: Verify the old element before disassembly. Before opening the inlet filter assembly, read the stamped part number on the old element end cap and note the installation position. Confirm it matches the replacement before continuing. Inlet-stage and clean-stage elements have different part numbers — this step is critical for error prevention.
Step 4: Remove and inspect the old element. Remove the old element vertically and observe dust distribution and media condition. Criteria: if media shows damage, perforation, end-cap adhesive failure, or compressed seal face, replace immediately even if the service interval has not been reached. If the outer surface has black oily sludge, inlet oil mist is abnormal — inspect upstream conditions (particularly important for oil-free compressors).
Step 5: Clean the assembly interior. Wipe the inner walls and bottom with a lint-free cloth. Do not blow compressed air directly into the assembly (this drives dust into the intake path). Criteria: no loose dust on inner walls, seal face flat and free of debris.
Step 6: Install the new element. Install in the same orientation and position as the old element, paying attention to seal face direction and compression method. Criteria: no movement after seating, seal face evenly compressed around the circumference.
Step 7: Reassemble and confirm sealing. Reinstall cover or clamp and tighten evenly per compressor requirements. 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, and record. Reset the maintenance timer, start the compressor at no load, and observe the intake depression gauge reading and running sound. Criteria: gauge stable within compressor allowable range, no abnormal whistling (whistling often indicates seal bypass). Record the compressor running hours at replacement as the starting point for the next interval.
Frequently Asked Questions
Q1: Which compressor models use 47722477001?
Ingersoll Rand centrifugal air compressors — MSG TURBO-AIR and MSG Centac series and their packaged systems (part-level model code P675, compressor group identifier C675). Centrifugal compressors are 100% oil-free by design. For a specific compressor, confirm against the nameplate and 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 connections designed for centrifugal compressor inlet 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, quarry, mining, metalworking), reduce hours to approximately 1500. The intake depression gauge reading is the final criterion — replace when the reading exceeds the limit, regardless of running hours.
Q4: Why does a centrifugal compressor require higher inlet filtration than a screw compressor?
Centrifugal compressors are oil-free by design — no lubricating oil in the compression chamber to carry away contaminants. Particles deposit on high-speed impeller and intercooler surfaces. Impeller fouling causes dynamic balance deviation, requiring shutdown and rotor correction. Screw compressors have an oil film that can partially carry away contaminants, so inlet filtration tolerance is relatively higher.
Q5: Why are dimensions not listed?
Centrifugal compressors are supplied as project-specific packages. Inlet assembly dimensions vary between groups and package scopes within the same series — listing a single dimension could mislead procurement. We recommend measuring the old element's outer diameter, inner diameter, total height, and seal type, or providing photos of the old element and compressor nameplate. We will cross-reference by part number before confirming.
Q6: What happens when inlet resistance increases?
First, energy consumption rises — each 1 kPa increase in inlet resistance raises compression ratio by approximately 1%, increasing compressor energy consumption by approximately 1%. Second, inlet air volume decreases, reducing compressor discharge volume. Continuing to use an element past its replacement threshold costs more in electricity than the filter element itself.
Q7: Can alternative parts be used?
Yes, but three items must be verified: filtration rating, end-cap seal type, and dimensions. If an alternative part's seal type does not match the original, bypass occurs — for oil-free centrifugal compressors, bypass means particles enter the impeller directly, a higher risk than for oil-flooded units. When sourcing alternatives, provide photos of the old element and this part number.
Q8: What should I do if abnormal whistling occurs after installation?
Whistling usually indicates seal bypass — element not fully seated, seal face deformed, or seal missing. Stop the compressor immediately and recheck: element seating, seal face compression or inversion. Also check whether the intake depression gauge impulse line is blocked to avoid misjudgment.
Q9: What are the storage requirements for spare parts?
Store in a dry, ventilated, light-protected area. Avoid moisture, rain, and heavy objects. Moisture reduces media strength; compression deformation damages seal fit. Use within 24 months.
Q10: What other filters in the same series are easily confused?
In the Ingersoll Rand centrifugal product line, the same compressor often has both inlet filtration and downstream clean filtration elements, with different part numbers and installation positions. Before ordering, confirm whether it is the inlet stage or clean stage — filtration rating, materials, and seal type differ between the two.
Compatible Compressor Models
This element is designed for Ingersoll Rand centrifugal air compressors:
| Item | Details |
|---|---|
| Compressor Type | Centrifugal air compressor |
| Product Line | Ingersoll Rand centrifugal product line (CC) |
| Series | MSG TURBO-AIR / MSG Centac |
| Part-Level Model Code | P675 |
| Compressor Group Identifier | C675 |
| Air Quality Class | 100% oil-free, ISO 8573-1 Class 0 |
| Typical Applications | Continuous, clean, oil-free air supply (food & beverage, pharmaceutical, electronics, textile, pneumatic conveying, etc.) |
Representative model families (family-level reference; individual compatibility must be verified by serial number)
| Series | Representative Models |
|---|---|
| MSG TURBO-AIR | TA / NX series packaged compressors |
| 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 compressors |
| Packaged Systems | Refrigerated dryers, filters, air receivers and other downstream equipment for the above compressors |
Why part-number verification is essential rather than model-based selection
Centrifugal compressors are supplied as project-specific packages: the same compressor model may have different inlet assembly configurations, downstream equipment scope, and connection dimensions across projects. The same compressor also has both inlet-stage and downstream clean filtration elements with different part numbers. Therefore, selection should be based on: first, the part number stamped on the old element; second, the compressor nameplate; third, the installation position.
Three-step verification method
- Read the stamped part number on the old element end cap or cage and compare with the ordered part number.
- Read the compressor nameplate model and group identifier and compare with that compressor's parts manual.
- Confirm the old element's installation position (inlet stage / clean stage) — the two are not interchangeable.
If verification cannot be completed after these three steps, provide a photo of the compressor nameplate, photos of the old element (including stamped part number), and installation position description. We will cross-reference by part number before confirming.
Cross-series note: Centrifugal compressor filter elements and oil-flooded screw compressor filter elements belong to different part number systems and cannot be interchanged. Screw compressor air filters are dimensioned for external inlet assemblies — direct substitution will cause seal failure.
Related Components
Components in the inlet and air path system 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 filtration, further removing microorganisms and particles from compressed air for higher air quality requirements | Different filtration stage from inlet filter — part numbers not interchangeable; confirm installation position at replacement |
| Air Filter Assembly (Housing) | — | Housing assembly that holds and secures the inlet filter element | Check clamps, seal faces, and outlet end for deformation or corrosion |
| Intake Depression Gauge / Differential Pressure Gauge | — | Displays inlet resistance — the final criterion for replacement interval | Regularly check impulse line for blockage — blockage gives a "false clean" reading |
| Seals | — | Ensures no bypass between element and assembly | Inspect together with element; replace if compressed, hardened, or missing |
| Compressor Lubricating Oil and Oil Filter | — | For gearbox and bearing lubrication system (not compression chamber oil) | Replace per compressor parts manual intervals; inspect together with inlet filter element |
Recommended companion replacement: Inlet filter element, downstream clean filter element, and seals should be inspected together, with replacement decisions made independently per each component's criteria. Inlet and downstream clean elements have different replacement intervals (downstream elements are typically judged by air quality requirements rather than dust loading) — there is no need to force simultaneous replacement.
For specific part numbers: Items marked "—" above should be referenced from the compressor's accompanying parts manual. Centrifugal compressors are project-specific packages — part numbers listed in the manual correspond to the specific compressor serial number and should not be applied across projects.