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 compressor inlet filter assembly, upstream of the centrifugal impeller intake. As the machine draws in ambient air, dust, grit and fibers are captured by the filter media before reaching the impeller and intercooler.

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 buildup can shift its dynamic balance — so inlet filtration condition directly affects rotor stability and maintenance cost.

This part belongs to the Ingersoll Rand centrifugal product line (product line code CC), with piece-level model code P675 and compressor group designation C675. Centrifugal compressors 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 the impeller and cooler surfaces, making inlet filtration requirements higher than those of oil-flooded screw compressors.

Key Specifications

Item	Value
Part Number	47722477001
Product Name	Air Filter Element
Brand	Ingersoll Rand
Application	Ingersoll Rand centrifugal air 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 / 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 compressor rated inlet flow; select after correcting for discharge volume, inlet temperature and altitude
Initial Pressure Drop	Approx. 0.3–0.5 kPa when new and clean
Operating Differential	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 machines 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 detail (theoretical, 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 compressor energy consumption by approximately 2%. Centrifugal compressors are high-power and often run continuously, so this energy cost typically exceeds the price of the filter element itself. Operating to a resistance limit rather than a calendar interval is more 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 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 cage fixation 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 the media of at least 5 kPa without deformation
Function	Inlet-stage filtration for oil-free centrifugal compressors; works with downstream clean filtration elements to maintain air purity

Service Life and Maintenance

Parameter	Value / Notes
Service Life	2000 hours or 3 months, whichever comes first
High-Dust Environment	Shorten hours accordingly (e.g. approx. 1500 hours); time limit also moves up
Shelf Life	Use within 24 months; store in a dry, ventilated, light-protected area, away from moisture and compression deformation
Replacement Criteria	Intake depression gauge reading exceeds limit, or media shows damage, debonding or a flattened 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; these compressor packages are Class 0 (100% oil-free)
Note	ISO 2941 / 2942 / 2943 / 3723 / 3724 series frequently cited in replacement-part literature are hydraulic filter standards for pressure, burst and filtration characteristics. They do not apply to air filter elements and should not be used as air filter performance evidence.

Installation and Maintenance Steps

Step 1: Confirm machine status and spare parts. Check the compressor nameplate model and group designation, and confirm the new 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 full depressurization (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 element before starting work. Before opening the inlet filter assembly, read the part number stamped on the old element end cap and note its installation position. Confirm it matches the purchased part before proceeding. Inlet-stage and clean-stage elements on centrifugal machines carry different part numbers — this is the key error-prevention step.

Step 4: Remove and inspect the old element. Lift out the old element vertically and examine dust distribution and media condition. Criteria: replace immediately if the media is damaged, perforated, the end cap is debonded or the seal face is flattened, even if the service interval has not been reached. If the outer surface carries black oily sludge, inlet oil mist is abnormal — investigate the upstream environment (particularly important 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 aggressively 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. Fit the new element in the same orientation and position as the old one, observing seal face direction and clamping method. Criteria: element seats 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 line gives a false "clean" reading, 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 the machine's allowable range, no abnormal whistling (whistling often indicates seal bypass). Record the machine running hours at replacement as the starting point for the next interval.

Frequently Asked Questions

Q1: Which machines 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, compressor group designation C675). Centrifugal machines are 100% oil-free by design. For a specific machine, always confirm against the nameplate and the old element part number.

Q2: Can it be fitted to an oil-flooded screw compressor?

Not recommended. This is an inlet filter element from the centrifugal product line, dimensioned and ported for centrifugal compressor inlet 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), shorten 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 do centrifugal compressors demand more from inlet filtration than screw compressors?

Centrifugal machines are oil-free, so there is no lubricating oil in the compression chamber to carry contaminants away; particles deposit on the high-speed impeller and intercooler surfaces. Impeller fouling shifts dynamic balance and requires a shutdown for rotor correction. Screw compressors have an oil film that can carry some contaminants away, giving greater tolerance in inlet filtration.

Q5: Why are dimensions not listed?

Centrifugal compressors are supplied as project-specific packages. Inlet assembly dimensions differ between groups and package scopes within the same series, so listing a single dimension set can mislead buyers. We recommend measuring the old element's outer diameter, inner diameter, overall height and seal type, or providing old-element photos and the compressor nameplate. We will cross-check by part number before confirming.

Q6: What happens when inlet resistance rises?

First, energy consumption increases — each 1 kPa rise in inlet resistance raises compression ratio by approximately 1% and energy consumption by approximately 1%. Second, inlet flow decreases, reducing compressor discharge volume. Continuing to run past the replacement threshold costs more in electricity than the filter element saves.

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 — 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 old-element photos and this part number.

Q8: What should I do 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. Stop the machine immediately and recheck: element seating, seal face flattening or inversion. Also check the intake depression gauge impulse line for blockage to avoid misdiagnosis.

Q9: What are the storage requirements?

Store in a dry, ventilated, light-protected area away from moisture, rain and heavy loads. Moisture reduces media strength, and compression deformation damages the seal fit. Use within 24 months.

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

In the Ingersoll Rand centrifugal product line, a single machine often has both an inlet-stage and a downstream clean-stage element, with different part numbers and installation positions. Always confirm whether you need the inlet stage or the clean stage before ordering — filtration rating, material and seal type differ between the two.

Compatible Machines

This element is suitable for Ingersoll Rand centrifugal air compressors:

Item	Details
Machine Type	Centrifugal air compressor
Product Line	Ingersoll Rand centrifugal product line (CC)
Series	MSG TURBO-AIR / MSG Centac
Piece-Level Model Code	P675
Compressor 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 of the centrifugal series (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 treatment for the above units

Why verification must be by part number, not machine model: centrifugal compressors are supplied as project-specific packages. Inlet assembly configuration, downstream treatment scope and connection dimensions can differ between projects for the same machine. A single machine also carries separate inlet-stage and downstream clean-stage elements with different part numbers. Select parts using the old element part number as the first reference, the machine nameplate as the second, and the installation position as the third.

Three-step verification method:

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

If these three steps do not confirm fitment, provide the machine nameplate photo, old-element photos (including the stamped part number) and installation position description. We will cross-check 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 used interchangeably. Screw compressor air filters are dimensioned and ported for external inlet assemblies; direct substitution will cause seal failure.

Related Components

In the inlet and air path system of the Ingersoll Rand centrifugal product line, 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 element that further removes microorganisms and particles from compressed air for higher-purity applications	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 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	Periodically check the impulse line for blockage — a blocked line gives a false "clean" reading
Seals	—	Prevent bypass between element and assembly	Inspect together with the element; replace if flattened, hardened or missing
Compressor lubricating oil and oil filter	—	For the gearbox and bearing lubrication system of centrifugal machines (not compression chamber oil)	Replace at intervals specified in the machine parts manual; inspect together with the inlet filter element

Paired replacement recommendation: inspect the inlet filter element, downstream clean filter element and seals together, and decide replacement for each according to its own criteria. The inlet element and downstream clean element have different replacement intervals (the downstream element is usually judged by air purity requirements rather than dust loading), so forced simultaneous replacement is not necessary.

For specific part numbers: items marked "—" above should be confirmed against the machine-specific parts manual. Centrifugal compressors are supplied as project packages, 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.