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 mounts inside the intake filter assembly, upstream of the centrifugal impeller inlet. As the first barrier in the air path, it captures dust, grit and fibers before they reach the impeller and intercooler.

This part belongs to the Ingersoll Rand centrifugal product line (CC), with item-level model code P675 and 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 contaminants away, particles deposit directly on impeller and cooler surfaces — so inlet filtration requirements are higher than for oil-flooded screw compressors.

Core Specifications

Item	Value
Part Number	47722477001
Product 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 Change 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, restriction and dust holding capacity; HVAC classification systems (G4/F7 etc.) do not apply
Dust Holding Capacity	—

Flow and Restriction

Parameter	Value / Notes
Rated Air Flow	Must exceed unit rated inlet flow; match after correcting 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 Restriction	Typical replacement threshold approx. 1.5–2.5 kPa; for centrifugal units the intake depression gauge reading is the final criterion
Restriction vs. Energy	Each 1 kPa increase in inlet restriction raises compression ratio by approx. 1%, increasing unit energy consumption by approx. 1.0%

Restriction vs. energy consumption (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 replacement threshold, inlet restriction rises by more than 2 kPa and unit energy consumption increases by roughly 2%. Centrifugal units are high-power and often run continuously, so this energy gap frequently exceeds the price of the element itself — running past the restriction limit is not economical.

Construction and Materials

Parameter	Value / Notes
Filter Media	Wood pulp fiber filter paper (cellulose media), 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 end caps
Bonding	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 at least 5 kPa differential across the media without deformation
Function	Inlet-stage filtration for oil-free centrifugal units; works with downstream clean-side filter to maintain air purity

Service Life and Maintenance

Parameter	Value / Notes
Service Life	2000 hours or 3 months, whichever comes first
High-Dust Environments	Reduce hour interval accordingly (e.g. approx. 1500 hours) and bring the time limit forward
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 exceeds limit, or media shows damage, de-bonding or a compressed seal face

Applicable Standards

Standard	Notes
ISO 5011	Inlet air filter efficiency and dust holding capacity test method — the performance basis for this type of air filter element
ISO 8573-1	Compressed air quality classes; these units are Class 0 (100% oil-free)
Note	The ISO 2941 / 2942 / 2943 / 3723 / 3724 series often cited for replacement elements 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 air filters.

Installation and Maintenance Steps

Step 1 — Confirm unit status and spare part. Check the unit nameplate model and group identifier; confirm the purchased element matches the old part number. Have the new element, clean cloths and necessary tools ready.

Step 2 — Shut down, depressurize, isolate power. Follow the shutdown procedure and wait for full depressurization (centrifugal units have rotational inertia; wait for the controller to confirm zero speed). Lock out and tag out the main power supply. This step is mandatory.

Step 3 — Verify the old part before disassembly. Before opening the intake filter assembly, read the stamped part number and mounting position on the old element and confirm it matches the purchased item. Inlet-stage and clean-side elements on centrifugal units 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. Replace immediately if the media is torn, perforated, de-bonded from the end cap, or the seal face is compressed — even if the service interval has not been reached. Black oily sludge on the outer surface indicates abnormal oil mist in the inlet; investigate the upstream environment (particularly important 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 into the assembly — this drives dust into the intake duct. The interior should be free of loose dust and the seal face flat and clear of debris.

Step 6 — Install the new element. Fit the new element in the same orientation and position as the old one, noting seal face direction and clamping method. The element should seat without movement and the seal face should be evenly compressed around its 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 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 unit unloaded and observe the intake depression gauge and running sound. The gauge should stabilize 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 cycle.

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 (item-level model code P675, unit group identifier C675). Centrifugal units are 100% oil-free by design. For a specific unit, confirm against the unit nameplate and the old part number.

Q2: Can it be used on an oil-flooded screw compressor?
Not recommended. This is an inlet filter element from the centrifugal product line, sized and configured for centrifugal unit 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?
The standard interval is 2000 hours or 3 months, whichever comes first. In high-dust environments (cement, quarrying, mining, metalworking), reduce the hour interval to approximately 1500 hours. Ultimately the intake depression gauge reading governs — replace when the reading exceeds the limit, regardless of running hours.

Q4: Why is inlet filtration more critical on centrifugal units than screw compressors?
Centrifugal units are oil-free; with no oil film in the compression chamber to carry contaminants away, particles deposit on the high-speed impeller and intercooler surfaces. Impeller fouling causes dynamic balance drift, which requires shutdown and rotor rebalancing. Screw compressors have an oil film that carries away some contaminants, giving more tolerance in inlet 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, and listing 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 element and the unit nameplate so we can cross-reference by part number before confirming.

Q6: What happens when inlet restriction rises?
First, energy consumption increases — each 1 kPa of additional inlet restriction raises compression ratio by about 1% and unit energy consumption by about 1%. Second, inlet flow drops, reducing discharge volume. Continuing to run past the replacement threshold costs more in electricity than the element itself.

Q7: Can aftermarket equivalents be used?
Yes, but three points must be verified: filtration rating, end cap seal type and dimensions. If the seal type does not match the original, bypass occurs — on an oil-free centrifugal unit, bypass means particles reach the impeller directly, a higher risk than on oil-flooded units. When sourcing equivalents, provide photos of the old element and this part number.

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 immediately and check: is the element properly seated, is the seal face compressed or rolled. Also check the intake depression gauge impulse line for blockage to avoid misdiagnosis.

Q9: What are the storage requirements?
Store in a dry, ventilated place 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.

Q10: Which elements in the same series are easily confused?
In the Ingersoll Rand centrifugal product line, the same unit often carries both an inlet-stage filter and a downstream clean-side filter, with different part numbers and mounting positions. Always confirm whether you need the inlet stage or the clean side — filtration ratings, materials and seal types differ between the two.

Compatible Units

This part is designed for Ingersoll Rand centrifugal air compressors:

Item	Details
Unit Type	Centrifugal air compressor
Product Line	Ingersoll Rand centrifugal product line (CC)
Series	MSG TURBO-AIR / MSG Centac
Item-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, textiles, pneumatic conveying)

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 units

Why verify by part number, not 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. The same unit also carries both inlet-stage and downstream clean-side elements with different part numbers. Selection should be based first on the part number stamped on the old element, second on the unit nameplate, and third on the mounting position.

Three-step verification:

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

If these three steps do not confirm fitment, provide a photo of the unit nameplate, photos of the old element (including the stamped part number) and the mounting position, and we will cross-reference by part number.

Cross-series note: Centrifugal unit elements and oil-flooded screw compressor elements belong to different part number systems and cannot be interchanged. Screw compressor air filters are sized and configured for external intake 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	Check Points
Sterile filter element	47722478001	Downstream sterile-grade filter element, further removing 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 mounting 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 / differential gauge	—	Displays inlet restriction; the final criterion for replacement	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 compressed, hardened or missing
Unit lubricating oil and oil filter	—	For gearbox and bearing lubrication systems on centrifugal units (not compression chamber oil)	Replace per the unit parts manual intervals; inspect together with the inlet element

Recommended paired replacement: Inspect the inlet element, downstream clean-side element and seals together, and decide on replacement for each according to its own criteria. The inlet and downstream clean-side elements have different service intervals (the downstream element is typically judged by purity requirement rather than dust loading), so they need not be replaced on the same schedule.

For specific part numbers: Items marked "—" above should be confirmed against the unit-specific parts manual — centrifugal units are supplied as project packages, and the associated part numbers in the manual correspond to the serial number of the application unit. Do not apply them across projects.

Ordering and Verification

To confirm fitment before ordering, provide: the stamped part number on the old element, the unit nameplate model and group identifier, and the mounting position (inlet stage or clean side). We can cross-reference by part number and confirm availability. Bulk and OEM supply enquiries are welcome — request a quotation or datasheet for your project.