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, and captures dust, grit and fibers before they reach the impeller and intercooler.

This is the first barrier in the air path of a centrifugal machine. The impeller downstream is a high-speed rotating component — deposited dust 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 (code CC), with item-level model code P675 and unit group identification C675. Centrifugal units are 100% oil-free by design (ISO 8573-1 Class 0): there is no lubricating oil in the compression chamber to carry contaminants away, so particles settle on the impeller and cooler surfaces. Inlet filtration requirements are therefore higher than for oil-flooded screw compressors.

Core 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 change interval	2,000 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 classes (G4/F7 etc.) do not apply
Dust holding capacity	—

Flow and Pressure Drop

Parameter	Value / Notes
Rated flow	Must exceed unit rated inlet flow; size with correction for discharge volume, inlet temperature and altitude
Initial pressure drop	Approx. 0.3–0.5 kPa with a clean element
Operating differential range	Rises 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 units the intake depression gauge reading is the final criterion
Pressure drop vs. energy	Each 1 kPa of inlet resistance raises the compression ratio by about 1%, increasing unit energy consumption by about 1.0%

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

Materials and 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 cages supporting the pleats 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 fixing and edge-sealing media to end caps and cages

Operating Limits

Parameter	Value / Notes
Working temperature	-10 °C to +80 °C
Relative humidity	≤90% RH, non-condensing
Collapse resistance	Standard design withstands at least 5 kPa across the media without deformation
Function	Inlet-stage filtration on oil-free centrifugal units, working with the downstream clean filter to protect air quality

Service Life and Storage

Parameter	Value / Notes
Service life	2,000 hours or 3 months, whichever comes first
High-dust environment	Shorten hours accordingly (e.g. approx. 1,500 hours) and bring the time limit forward
Storage life	Use within 24 months; store dry, ventilated and out of direct light, protected from moisture and compression
Replacement criteria	Intake depression gauge reading over limit, or media damage, debonding or flattened seal face

Applicable Standards

Standard	Notes
ISO 5011	Inlet filter efficiency and dust holding capacity test method — the performance basis for this class of air filter
ISO 8573-1	Compressed air quality classes; these units are Class 0 (100% oil-free)
Note	ISO 2941 / 2942 / 2943 / 3723 / 3724 are hydraulic filter standards for pressure, burst and filtration characteristics and do not apply to air filters; do not use them as the performance basis for air elements

Installation and Maintenance Steps

Step 1 — Confirm unit status and spare part. Check the unit nameplate model and group identification, and confirm the new element matches the old part number. Have the new element, lint-free cloths and tools ready.

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

Step 3 — Verify the old element before disassembly. Before opening the intake filter assembly, read the part number stamped on the old element end cap and note its mounting position. Centrifugal units use different part numbers for the inlet and clean stages; this step prevents mismatching.

Step 4 — Remove and inspect the old element. Lift it out vertically and examine dust distribution and media condition. Replace immediately if the media is torn or punctured, the end cap has debonded, or the seal face is flattened — even before the interval is due. Black oily sludge on the outer surface indicates abnormal oil mist in the intake; investigate the upstream environment (especially 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 inner walls should be free of loose dust and the seal face flat and clean.

Step 6 — Install the new element. Fit it in the same orientation and position as the old one, observing seal face direction and clamping method. The element should sit without movement and the seal should be 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 and is a common source of misjudgment.

Step 8 — Reset, test run, record. Reset the maintenance timer, start the unit unloaded and observe the depression gauge and running sound. The gauge should stabilize within the unit's permitted range with no abnormal whistling (whistling often indicates seal bypass). Record the unit running hours at replacement as the start of the next interval.

Frequently Asked Questions

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, unit group identification C675). Centrifugal units are 100% oil-free by design. For a specific machine, confirm against the unit 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 and its dimensions and interface are designed for centrifugal intake assemblies. Oil-flooded screw compressors use a different part number system; mixing them 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, quarrying, mining, metalworking) shorten to about 1,500 hours. The intake depression gauge reading is the final criterion — replace when it exceeds the limit, regardless of running hours.

Q4: Why do centrifugal compressors demand more of inlet filtration than screw compressors?
Centrifugal machines are oil-free: there is no lubricating oil in the compression chamber to carry contaminants away, so particles deposit on the high-speed impeller and intercooler surfaces. Impeller fouling causes dynamic balance drift and requires a shutdown for rotor correction. Screw compressors have an oil film that carries some contaminants away, so inlet filtration tolerates more.

Q5: Why are dimensions not listed?
Centrifugal units are supplied as project packages; intake assembly dimensions vary between groups and package scopes within the same series, and listing a single size would mislead buyers. Measure the old element's outer diameter, inner diameter, overall height and seal type, or provide photos of the old element and the unit nameplate, and we will cross-check by part number before confirming.

Q6: What happens when inlet resistance rises?
Energy consumption increases — each 1 kPa of added inlet resistance raises the compression ratio by about 1% and unit energy consumption by about 1%. Inlet flow also falls, reducing discharge volume. Running past the replacement threshold costs more in electricity than the element costs to replace.

Q7: Can alternative parts be used?
Yes, but verify three things: filtration rating, end cap seal type and dimensions. An alternative that does not match the original seal type will bypass — on an oil-free centrifugal machine, bypass means particles reach the impeller directly, a higher risk than on oil-flooded units. Provide photos of the old element and this part number when sourcing alternatives.

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 recheck seating and seal condition. Also check the depression gauge impulse line for blockage to avoid misdiagnosis.

Q9: How should spares be stored?
Store dry, ventilated and out of direct light, protected from moisture, rain and heavy compression. Moisture reduces media strength and compression deforms the sealing fit. Use within 24 months.

Q10: Which other elements in the same series are easily confused?
On the Ingersoll Rand centrifugal product line, a single machine often carries both an inlet filter and a downstream clean filter, with different part numbers and mounting positions. Always confirm whether you need the inlet or clean stage — filtration rating, materials and seal type differ between them.

Compatible Machine Range

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
Unit group identification	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 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 selection must be by part number, not machine model
Centrifugal units are supplied as project packages: the same machine can have different intake assembly configurations, downstream scope and interface dimensions across projects. A single machine also carries both an inlet-stage and a downstream clean-stage element with different part numbers. Select by the part number on the old element first, the unit nameplate second, and the mounting position third.

Three-step verification

1. Read the part number stamped on the old element end cap or cage and compare it with this part number.
2. Read the model and group identification on the unit nameplate and compare with the unit parts manual.
3. Confirm the old element's mounting position (inlet stage or clean stage); 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-check by part number.

Cross-series note: centrifugal compressor elements and oil-flooded screw compressor elements belong to different part number systems and cannot be interchanged. Screw compressor air filters are dimensioned for external intake assemblies; direct substitution will cause seal failure.

Related Components

Component	Part number	Function	Inspection points
Sterile filter element	47722478001	Downstream sterile-grade element for further removal of microorganisms and particles where higher air quality is required	Belongs to a different filtration stage; part numbers are not interchangeable — confirm mounting position at replacement
Air filter assembly (housing)	—	Housing that carries and retains the inlet filter element	Check clamps, seal faces and outlet end for deformation or corrosion
Intake depression / differential gauge	—	Displays inlet resistance and is the final criterion for the 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
Unit lubricating oil and oil filter	—	For the gearbox and bearing lubrication system (not compression chamber oil)	Replace at intervals specified in the unit parts manual; inspect alongside the inlet filter

Paired replacement advice: inspect the inlet filter, downstream clean filter and seals together, and decide each on its own criteria. The inlet and downstream clean elements have different intervals (the downstream element is usually judged by air quality requirements rather than dust loading), so they need not be replaced on the same schedule.

For specific part numbers: items marked "—" above should be taken from the unit-specific parts manual. Centrifugal units are packaged per project and the listed companion part numbers correspond to the serial numbers of the machines they were supplied with; do not apply them across projects.