Ingersoll Rand 47722477001 Air Filter Element | MSG Centac Inlet Filter

Product Overview

47722477001 is the inlet air filter element for Ingersoll Rand centrifugal air compressors. It installs inside the intake filter assembly, upstream of the centrifugal impeller inlet. As outside air is drawn in, dust, grit, and fibers are captured before they reach the impeller and intercooler.

This element is the first barrier in the centrifugal compressor air path. The downstream impeller rotates at high speed, and dust buildup can shift its dynamic balance — so inlet filtration directly affects rotor stability and maintenance cost.

This part belongs to the Ingersoll Rand centrifugal product line (product line code CC). The piece-level model code is P675, corresponding to unit group identifier C675. Centrifugal units are designed as 100% oil-free (ISO 8573-1 Class 0). With no lubricating oil in the compression chamber to carry away contaminants, particles settle on the impeller and cooler surfaces — making inlet filtration more critical than on 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	2,000 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	Characterized per ISO 5011 by efficiency, resistance, and dust holding capacity; HVAC classification (G4/F7 etc.) does not apply
Dust Holding Capacity	—

Flow and Pressure Drop

Parameter	Value / Notes
Rated Air Flow	Must exceed unit rated intake volume; match after correcting for discharge volume, inlet temperature, and altitude
Initial Pressure Drop	Approx. 0.3–0.5 kPa (clean, new element)
Operating Differential	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; centrifugal units use the intake depression gauge reading as the final criterion
Pressure Drop vs. Energy	Each 1 kPa increase in inlet resistance raises the compression ratio by approx. 1%, increasing unit energy consumption by approx. 1.0%

Pressure drop / energy relationship (theoretical, 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 more than 2 kPa, increasing unit energy consumption by roughly 2%. Centrifugal units are high-power and often run continuously, so this energy difference frequently exceeds the price of the element itself. Extending service by calendar time rather than resistance reading is not economical.

Construction and Materials

Parameter	Value / Notes
Filter Media	Cellulose (wood pulp fiber) filter paper, pleated construction
Media 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 media
Seal	Polyurethane or NBR seal, integrated 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 Pressure	Standard design withstands differential pressure across media of no less than 5 kPa without deformation
Function	Inlet-stage filtration for oil-free centrifugal units; works with downstream clean filtration to maintain air quality

Service Life and Maintenance

Parameter	Value / Notes
Service Life	2,000 hours or 3 months, whichever comes first
High-Dust Environment	Reduce hours accordingly (e.g., approx. 1,500 hours); shorten the time limit as well
Storage Shelf Life	Use within 24 months; store in a dry, ventilated, dark place; avoid moisture and compression deformation
Replacement Criteria	Intake depression gauge reading exceeds limit, or media shows damage, debonding, or compressed seal face

Applicable Standards

Standard	Notes
ISO 5011	Inlet air filter efficiency and dust holding capacity test method — the performance basis for this class of air filter element
ISO 8573-1	Compressed air quality classes; this class of unit 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 and should not be used as performance basis for air filters

Installation and Maintenance Steps

Step 1: Confirm unit status and spare part
Check the unit nameplate model and group identifier; confirm the replacement element matches the old part number. Prepare the new element, lint-free cloth, and necessary tools.

Step 2: Shut down, depressurize, and lock out
Follow the shutdown procedure and wait for full depressurization (centrifugal units have rotational inertia — wait for the controller to confirm zero speed). Disconnect main power and apply lockout/tagout. This is mandatory and must not be omitted.

Step 3: Verify the old part before proceeding
Before opening the intake filter assembly, read the stamped part number on the old element end cap and note its installation position. Confirm it matches the ordered part before continuing. Inlet-stage and clean-stage elements on centrifugal units have different part numbers — this step is the key error-prevention check.

Step 4: Remove the old element and assess
Lift out the old element vertically and inspect dust distribution and media condition. Criteria: if the media shows damage, perforation, end-cap debonding, or a 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 the upstream environment (this is a priority check on oil-free units).

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 interior (it drives dust into the intake passage). 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: element seated without movement; seal face evenly compressed around the circumference.

Step 7: Reassemble and confirm sealing
Refit the cover or clamp and tighten evenly per unit requirements. Check that the intake depression gauge impulse line is clear — a blocked line gives a falsely clean reading and is a common source of misjudgment.

Step 8: Reset, test run, and record
Reset the maintenance timer, start the unit at no load, and observe the intake depression gauge reading and running sound. Criteria: gauge stable within the unit's allowable range; no abnormal whistling (whistling often 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?

It is used on Ingersoll Rand centrifugal air compressors — MSG TURBO-AIR and MSG Centac series and their packaged systems (piece-level model code P675, unit group identifier C675). Centrifugal units are 100% oil-free by design. For a specific unit, verify against the unit nameplate and the old part number.

Q2: Can it be used on oil-flooded screw compressors?

Not recommended. This element belongs to the centrifugal product line; its dimensions and connections are designed for centrifugal unit intake assemblies. Oil-flooded screw compressors use a different part number system, and cross-use cannot guarantee sealing or filtration performance.

Q3: What is the replacement interval?

The standard interval is 2,000 hours or 3 months, whichever comes first. In high-dust environments (cement, quarry, mining, metalworking), reduce the hours to approximately 1,500. The final criterion is the intake depression gauge reading — replace when the reading exceeds the limit, regardless of running hours.

Q4: Why does a centrifugal compressor demand more from inlet filtration than a screw compressor?

Centrifugal units are oil-free by design. With no lubricating oil in the compression chamber to carry away contaminants, particles settle on the high-speed impeller and intercooler surfaces. Impeller dust buildup causes dynamic balance shift, 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 units are supplied as project-based packages. Intake assembly dimensions vary between groups and package scopes within the same series, so 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 old-part photos and the unit nameplate so we can cross-reference by part number before confirming.

Q6: What happens when inlet resistance rises?

First, energy consumption rises — each 1 kPa increase in inlet resistance raises the compression ratio by approx. 1%, increasing unit energy consumption by approx. 1%. Second, intake volume drops, reducing unit discharge volume. Continuing to use past the replacement threshold saves less on the element than the extra electricity consumed.

Q7: Can alternative parts be used?

Yes, but three items must be verified: filtration rating, end-cap seal type, and dimensions. If an alternative's seal type does not match the original, bypass occurs — and for oil-free centrifugal units, bypass means particles enter the impeller directly, a higher risk than on oil-flooded units. When sourcing alternatives, provide old-part photos and this part number.

Q8: What should be done if abnormal whistling occurs 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 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?

Store in a dry, ventilated, dark place. Avoid moisture, rain, and heavy-object compression. Moisture reduces media strength; compression deformation damages the seal fit. Use within 24 months.

Q10: Which other elements in the same series are easily confused?

In the Ingersoll Rand centrifugal product line, a single unit often has both inlet-stage and downstream clean-stage elements with different part numbers and installation positions. Before ordering, confirm whether it is the inlet stage or the clean stage — the two differ in filtration rating, material, and seal type.

Compatible Models

This part is suitable for Ingersoll Rand centrifugal air compressors as follows:

Item	Content
Unit Type	Centrifugal air compressor
Product Line	Ingersoll Rand centrifugal product line (CC)
Series	MSG TURBO-AIR / MSG Centac
Piece-Level Model Code	P675
Unit Group Identifier	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, textile, pneumatic conveying, etc.)

Representative model families (family-level reference; individual fit must be verified by serial number):

Series	Representative Models
MSG TURBO-AIR	TA / NX series 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 units

Why part-number verification is required rather than model-based selection

Centrifugal units are supplied as project-based packages: the same unit may have different intake assembly configurations, downstream scope, and connection dimensions across projects. A single unit also has both inlet-stage and downstream clean-stage elements with different part numbers. Therefore, selection should use the old part's stamped number as the primary basis, the unit nameplate as the secondary basis, and the installation position as the tertiary basis.

Three-step verification method

1. Read the stamped part number on the old element end cap or cage and compare with the ordered part number;
2. Read the model and group identifier on the unit nameplate and compare with the unit parts manual;
3. Confirm the old part's installation position (inlet stage / clean stage) — the two are not interchangeable.

If these three steps cannot confirm fit, provide unit nameplate photos, old-part photos (including stamped part number), and installation position description. We will cross-reference by part number before confirming.

Cross-series note: Centrifugal unit elements and oil-flooded screw compressor elements belong to different part number systems and cannot be used across series. Screw compressor air filter dimensions and connections are designed for external intake assemblies; direct substitution will cause seal failure.

Related Components

In the Ingersoll Rand centrifugal product line inlet and air path system, the following components 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	Belongs to a different filtration stage from the inlet element; part numbers are not interchangeable; confirm installation position at replacement
Air filter assembly (housing)	—	Housing assembly that holds and secures the inlet 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	Periodically check impulse line for blockage — blockage gives a falsely clean reading
Seals	—	Prevents bypass between element and assembly	Inspect together with element; replace if compressed, hardened, or missing
Unit lubricating oil and oil filter	—	For gearbox and bearing lubrication system (not compression chamber oil)	Replace per unit parts manual interval; inspect together with inlet element

Companion replacement recommendation: Inspect the inlet element, downstream clean element, and seals together, and decide replacement separately per each item's criteria. The inlet element and downstream clean element have different replacement intervals (the downstream part is typically judged by cleanliness requirements rather than dust loading), so they need not be replaced together.

For specific part numbers: Items marked "—" above should be confirmed against the unit-specific parts manual. Centrifugal units are project-based packages, and the companion part numbers listed in the manual correspond to the applied unit's serial number; they should not be used across projects.