Ingersoll Rand 47722477001 Air Filter Element | Centac MSG Intake Filter

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 intercoolers — critical on a 100% oil-free machine where no lubricant carries contaminants away.

This part belongs to the Ingersoll Rand centrifugal (CC) product line, with item-level model code P675 and unit group identifier C675. Centrifugal units are designed 100% oil-free (ISO 8573-1 Class 0), so intake filtration requirements are higher than on 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 change interval	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 classification	Characterised to ISO 5011 by efficiency, restriction and dust-holding capacity; HVAC classes such as G4/F7 do not apply

Flow and restriction

Parameter	Value / note
Rated air flow	Must exceed unit rated intake flow; size against discharge volume corrected for intake 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 restriction	Typical change threshold approx. 1.5–2.5 kPa; on centrifugal units the intake depression gauge reading is the final criterion
Restriction vs. energy	Each 1 kPa of intake restriction raises the compression ratio by about 1%, increasing unit energy consumption by about 1.0%

Intake 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%

Over the life of an element, intake restriction climbs by more than 2 kPa and unit energy consumption rises by roughly 2%. On high-power centrifugal units running continuously, that energy penalty usually exceeds the price of the element — running past the restriction threshold is not economical.

Construction and materials

Parameter	Value / note
Filter media	Wood-pulp cellulose fibre paper, pleated construction
Media weight	Approx. 130 g/m²
Inner / outer support	Galvanised perforated steel, supporting the pleats on both faces
End caps	Metal or polyurethane, bonded to the media
Seal	Polyurethane or nitrile rubber, integral with or separate from the end cap
Adhesive	Polyurethane, securing media to end caps and support

Operating limits and service life

Parameter	Value / note
Operating temperature	-10 °C to +80 °C
Relative humidity	≤90% RH, non-condensing
Collapse resistance	Standard design withstands at least 5 kPa differential across the media without deformation
Service life	2000 hours or 3 months, whichever comes first
High-dust environments	Shorten the hour limit accordingly (e.g. approx. 1500 hours) and bring the calendar limit forward
Storage life	Use within 24 months; store dry, ventilated and out of direct light, protected from moisture and crushing
Change criteria	Intake depression gauge reading out of limit, or media damage, adhesive failure or a flattened seal face

Applicable standards

Standard	Note
ISO 5011	Test method for intake filter efficiency and dust-holding capacity — the performance basis for this class of air filter
ISO 8573-1	Compressed air quality classes; the host units are Class 0 (100% oil-free)
Note	ISO 2941 / 2942 / 2943 / 3723 / 3724 are hydraulic filter standards and do not apply to air filter elements; they should not be used as performance evidence for intake filters

Installation and Maintenance Steps

1. Confirm unit status and spare. Check the unit nameplate model and group identifier, and confirm the new element matches the old part number. Have the element, clean cloths and tools ready.
2. Shut down, depressurise, isolate. Follow the shutdown procedure and allow full depressurisation — centrifugal units have rotational inertia, so wait for the controller to confirm zero speed. Lock out and tag the main supply. This step is mandatory.
3. Read the old element before dismantling. Note the stamped part number on the end cap and its mounting position, and confirm it matches the replacement. Intake and clean-side elements carry different part numbers — this is the key error-prevention 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, perforated, the end cap is debonded or the seal face is flattened — even before the interval is reached. Black oily sludge on the outer surface indicates abnormal oil mist in the intake; investigate the upstream environment.
5. Clean the housing interior. Wipe the inner walls and base with a lint-free cloth. Do not blow compressed air into the housing — it drives dust into the intake path. The walls should be free of loose dust and the seal face clean and flat.
6. Fit the new element. Install 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.
7. Refit and verify sealing. Replace 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 misjudgement.
8. Reset, test run and record. Reset the service timer, start the unit unloaded and observe the depression gauge and running sound. The gauge should stabilise within the permitted range with no abnormal whistling, which usually indicates seal bypass. Record the unit running hours as the start of the next interval.

Model Verification: Why Part Number Comes First

This element fits 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 and typically serve continuous, clean, oil-free air applications such as food and beverage, pharmaceutical, electronics, textiles and pneumatic conveying.

Centrifugal units are supplied as project-specific packages: intake assembly configuration, downstream treatment scope and connection dimensions can differ between projects, and the same unit carries both an intake element and a downstream clean-side 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 stamped part number on the old element end cap or support and compare it with the ordered number.
2. Read the model and group identifier on the unit nameplate and check it against the unit parts manual.
3. Confirm the mounting position of the old element (intake stage or clean stage) — the two are not interchangeable.

If the three steps do not confirm the part, send a nameplate photo, a photo of the old element showing the stamped number, and the mounting position. We will cross-check by part number before confirming.

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

Related Parts

Component	Part number	Function	Check points
Sterile filter element	47722478001	Downstream sterile-grade element removing microorganisms and fine particles for higher-purity air requirements	Different filtration stage from the intake element; part numbers are not interchangeable. Confirm mounting position on replacement.
Air filter assembly (housing)	—	Housing that carries and locates the intake element	Inspect clamps, seal faces and outlet end for deformation or corrosion
Intake depression / differential gauge	—	Indicates intake restriction and is the final change criterion	Check the impulse line regularly — a blockage gives a false clean reading
Seals	—	Prevent bypass between element and housing	Inspect together with the element; replace if flattened, hardened or missing
Unit lubricant and oil filter	—	For the gearbox and bearing lubrication system (not compression chamber oil)	Change at the intervals in the unit parts manual and inspect alongside the intake element

Paired replacement guidance: inspect the intake element, downstream clean-side element and seals at the same service visit, but decide each on its own criteria. The intake and clean-side elements have different change intervals — the downstream element is usually judged on cleanliness requirements rather than dust loading — so they need not be replaced together.

For specific part numbers: items marked “—” above should be taken from the unit-specific parts manual. Because centrifugal units are packaged per project, the accessory part numbers listed in the manual correspond to the serial number of the applied unit and should not be carried across projects.