Ingersoll Rand 47722477001 Air Filter Element | MSG Centac Intake

Product Overview

47722477001 is the intake 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 fibres before they reach the impeller and interstage coolers.

This part belongs to the Ingersoll Rand centrifugal (CC) product line, with item-level model code P675 and unit group designation C675. Centrifugal machines are designed 100% oil-free (ISO 8573-1 Class 0). With no lubricating oil in the compression chamber to carry contaminants away, particles deposit directly on the impeller and cooler surfaces — intake filtration requirements are therefore higher than for oil-flooded screw compressors.

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 replacement	2000 hours or 3 months

Technical Specifications

Filtration performance

Parameter	Value / note
Filtration rating	5–10 μm
Filtration efficiency	≥98% for particles ≥5 μm
Filter class	Characterised per ISO 5011 by efficiency, resistance and dust holding capacity; ventilation/HVAC classes (G4/F7 etc.) do not apply

Flow and pressure drop

Parameter	Value / note
Rated air flow	Must exceed unit rated intake volume; size after correcting for discharge volume, intake temperature and altitude
Initial pressure drop	Approx. 0.3–0.5 kPa (clean element)
Operating differential	Rises with dust loading; typical range approx. 0.5–1.5 kPa
Alarm / final resistance	Typical replacement threshold approx. 1.5–2.5 kPa; for centrifugal units the intake depression gauge reading is the final criterion
Pressure drop vs. energy	Each 1 kPa of intake resistance raises the compression ratio by approx. 1%, increasing unit energy consumption by approx. 1.0%

Pressure drop / energy relationship (theoretical, at 0.85 MPa discharge gauge pressure)

Intake 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, intake resistance rises by more than 2 kPa and unit energy consumption increases by roughly 2%. Centrifugal units are high-power and typically run continuously, so this energy gap frequently exceeds the price of the element itself — running on calendar time rather than resistance is not economical.

Construction and materials

Parameter	Value / note
Filter media	Cellulose (wood-pulp fibre) filter paper, pleated construction
Media weight	Approx. 130 g/m²
Inner / outer support	Galvanised steel perforated cages, supporting the media on both faces
End caps	Metal or polyurethane end caps, bonded to the media
Seal	Polyurethane or NBR sealing body, integral with or separate from the end cap
Bonding	Polyurethane adhesive for media-to-cap and media-to-cage fixing and edge sealing

Operating limits

Parameter	Value / note
Operating temperature	-10 °C to +80 °C
Relative humidity	≤90% RH, non-condensing
Burst / collapse resistance	Standard design withstands a differential pressure across the media of at least 5 kPa without deformation
Function	Intake-stage filtration for oil-free centrifugal units, working with the downstream clean filter element to protect air quality

Service life

Parameter	Value / note
Service life	2000 hours or 3 months, whichever comes first
High-dust environments	Reduce hours accordingly (e.g. approx. 1500 hours) and bring the time limit forward
Storage shelf life	Use within 24 months; store dry, ventilated and out of direct light, protected from moisture and compression
Replacement criteria	Intake depression gauge reading out of limit, or media damage, debonding or a flattened seal face

Applicable standards

Standard	Note
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; the complete unit is Class 0 (100% oil-free)
Note	The ISO 2941 / 2942 / 2943 / 3723 / 3724 series often quoted for replacement parts 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 intake air filters.

Installation and Maintenance Steps

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

Step 2 — Shut down, depressurise, isolate. Follow the shutdown procedure and allow the unit to fully depressurise (centrifugal units 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 part before dismantling. 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 intake stage and the clean stage; this step prevents mismatching.

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, debonded from the cap or the seal face is flattened — even if the service interval has not been reached. Black oily sludge on the outer surface indicates abnormal oil mist in the intake; investigate the upstream environment.

Step 5 — Clean the assembly interior. Wipe the inner wall and base with a lint-free cloth. Do not blow compressed air hard into the assembly — this drives dust into the intake duct. Criterion: no loose dust on the inner wall, seal face flat and free of debris.

Step 6 — Fit the new element. Install in the same orientation and position as the old element, observing seal face direction and clamping method. Criterion: the element sits without movement and the seal face is evenly compressed around its circumference.

Step 7 — Refit and confirm sealing. Replace 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 false “clean” reading and is a common source of misdiagnosis.

Step 8 — Reset, test run, record. Reset the service timer, start the unit at no load and observe the intake depression gauge and running sound. Criterion: gauge stable within the unit’s permitted range, no abnormal whistling (whistling usually 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 designation C675). Centrifugal units are 100% oil-free by design. For a specific machine, confirm against the unit nameplate and the old element part number.

Q2: Can it be fitted to 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 will not 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 to approximately 1500 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 from intake 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 interstage cooler 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 intake filtration tolerance is relatively higher.

Q5: Why are dimensions not listed?
Centrifugal units are supplied as project-based packages; intake assembly dimensions differ between groups and package scopes within the same series, so publishing a single size can 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-check by part number before confirming.

Q6: What happens when intake resistance rises?
First, energy consumption increases — each 1 kPa of intake resistance raises the compression ratio by about 1% and unit energy consumption by about 1%. Second, intake volume falls, reducing discharge volume. Running past the replacement threshold costs more in electricity than the element itself.

Q7: Can alternative parts 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 — and for an oil-free centrifugal machine, bypass means particles reach the impeller directly, a higher risk than with oil-flooded units. When sourcing alternatives, provide photos of the old element 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 unit and recheck: element seating, seal face flattening or inversion. Also check whether the intake depression gauge impulse line is blocked to avoid misdiagnosis.

Q9: How should spares be stored?
Store dry, ventilated and 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 other filters in the same series are easily confused?
In the Ingersoll Rand centrifugal product line, a single machine often carries both an intake-stage element and a downstream clean-stage element, with different part numbers and mounting positions. Always confirm whether you need the intake stage or the clean stage — filtration rating, materials and seal type differ between them.

Compatible Machines

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

Item	Detail
Machine type	Centrifugal air compressor
Product line	Ingersoll Rand centrifugal line (CC)
Series	MSG TURBO-AIR / MSG Centac
Item-level model code	P675
Unit 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)

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 parts must be verified by number rather than by machine model
Centrifugal units are supplied as project-based packages: intake assembly configuration, downstream scope and interface dimensions can differ between projects, and a single machine carries both intake-stage and downstream clean-stage elements with different part numbers. Selection should therefore 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 part number stamped on the old element end cap or cage and compare it with the ordered number.
2. Read the model and group designation on the unit nameplate and compare with the unit parts manual.
3. Confirm the old element’s mounting position (intake stage or clean stage) — the two are not interchangeable.

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

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 and interfaced for external intake assemblies; direct substitution will cause seal failure.

Related Components

In the intake and air path of the Ingersoll Rand centrifugal product line, the following parts are serviced in the same interval or the same stage:

Component	Part number	Function	Check points
Sterile filter element	47722478001	Downstream sterile-grade element, further removing microorganisms and particles from compressed air for higher-purity applications	Different filtration stage from the intake element; part numbers are not interchangeable — confirm mounting position at replacement
Air filter assembly (housing)	—	Housing assembly that carries and locates the intake element	Check clamps, seal faces and outlet end for deformation or corrosion
Intake depression gauge / differential gauge	—	Indicates intake resistance; the final criterion for replacement intervals	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 the compression chamber)	Replace at the intervals specified in the unit parts manual; inspect together with the intake element

Paired replacement advice: inspect the intake element, downstream clean element and seals together, and decide each on its own criteria. The intake element and downstream clean element have different replacement intervals (the downstream part is usually judged by cleanliness requirements rather than dust loading), so there is no need to force them onto the same schedule.

For specific part numbers: for items marked “—” above, refer to the unit-specific parts manual supplied with the machine. Centrifugal units are project-packaged, and the associated part numbers listed in the manual correspond to the serial number of the application unit; they should not be carried across projects.