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 unit's intake filter assembly, upstream of the centrifugal impeller inlet. As process air is drawn in, dust, grit and fibers are captured before they reach the impeller and intercooler.

This element is the first barrier in the centrifugal air path. Because the downstream impeller is a high-speed rotating component, deposited dust can shift its dynamic balance — inlet filtration condition therefore directly affects rotor stability and maintenance cost.

The part belongs to the Ingersoll Rand centrifugal product line (product line code CC), with part-level model code P675 and unit group designation C675. Centrifugal units are 100% oil-free by design (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 — so inlet filtration demands are higher than on oil-flooded screw compressors.

Key Specifications

• 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 replacement interval: 2,000 hours or 3 months

Technical Parameters

Filtration Performance

• 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 rating systems (G4/F7 etc.) do not apply

Flow and Pressure Drop

• Rated air flow: must exceed the unit's rated inlet volume; select according to discharge volume with correction for inlet temperature and altitude
• Initial pressure drop (clean element): approx. 0.3–0.5 kPa
• Operating differential range: approx. 0.5–1.5 kPa, rising progressively with dust loading
• 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 increase in inlet resistance raises the compression ratio by about 1%, increasing unit energy consumption by approximately 1.0%

Pressure drop / energy relationship (theoretical, at 0.85 MPa discharge gauge pressure): 0 kPa → ratio 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 a filter's service life, inlet resistance rises by more than 2 kPa, adding roughly 2% to unit energy consumption. Centrifugal compressors are high-power and typically run continuously, so this energy penalty often exceeds the price of the element itself — running on calendar time rather than pressure drop is not economical.

Construction and Materials

• Filter media: cellulose (wood pulp fiber) paper, pleated construction
• Media weight: approx. 130 g/m²
• Inner / outer support: galvanized steel perforated cages, supporting the media on both sides
• End caps: metal or polyurethane, bonded to the media
• Seal: polyurethane or NBR, integral with or separate from the end cap
• Bonding: polyurethane adhesive for media-to-end-cap and cage sealing

Operating Conditions

• Operating temperature: -10 °C to +80 °C
• Relative humidity: ≤90% RH (non-condensing)
• Burst / collapse resistance: standard design withstands not less than 5 kPa across the media without deformation
• Function: inlet-stage filtration for oil-free centrifugal units, working with downstream clean filtration to safeguard air quality

Service Life and Maintenance

• Service life: 2,000 hours or 3 months, whichever comes first
• High-dust environments: reduce hours accordingly (e.g. approx. 1,500 hours), with the time limit brought 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 over limit, or media damage, debonding, or compressed seal face

Applicable Standards

• 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; this unit class is Class 0 (100% oil-free)
• Note: ISO 2941 / 2942 / 2943 / 3723 / 3724 series frequently cited in aftermarket literature are hydraulic filter standards covering pressure resistance, collapse and filtration characteristics. They do not apply to air filters and should not be used as air filter performance evidence.

Installation and Maintenance Steps

1. Confirm unit status and spare part. Check the unit nameplate model and group designation, and confirm the new element matches the old part number. Have the new element, lint-free cloth and required tools ready.
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). Isolate the main power supply and apply lockout/tagout. This step is mandatory.
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's end cap and confirm it matches the ordered part. Inlet-stage and clean-stage elements on centrifugal units carry different part numbers — this step prevents errors.
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, punctured, debonded at the end cap, or the seal face is compressed — even if the interval has not been reached. Black oily sludge on the outer surface indicates abnormal oil mist in the intake; investigate the upstream environment (a priority check on oil-free units).
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 duct. Criterion: no loose dust on inner walls, seal face flat and free of debris.
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. Criterion: no movement once seated, seal face evenly compressed around the circumference.
7. Refit 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 line gives a falsely clean reading and is a common source of misjudgment.
8. Reset, test run, record. Reset the maintenance timer, start the unit at no load and observe the intake depression gauge reading and running sound. Criterion: gauge stable within the unit's permitted range, no abnormal whistling (whistling usually indicates seal bypass). Record the unit's running hours 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 (part-level model code P675, unit group designation C675). Centrifugal units are 100% oil-free by design. For a specific unit, confirm against the nameplate and the old part number.

Q2: Can it be fitted to an oil-flooded screw compressor?
Not recommended. This element belongs to the centrifugal product line, with dimensions and connections designed for centrifugal intake assemblies. Oil-flooded screw compressors use a separate part number system; cross-fitting 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), reduce to approximately 1,500 hours. The intake depression gauge reading is the final criterion — replace when over limit, regardless of running hours.

Q4: Why does a centrifugal compressor demand more from inlet filtration than a screw compressor?
Centrifugal units 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. Deposits on the impeller cause dynamic imbalance and require a shutdown for rotor correction. Screw compressors have an oil film that carries away some contaminants, giving greater tolerance in inlet filtration.

Q5: Why are dimensions not listed?
Centrifugal units are supplied as project-based packages; intake assembly dimensions differ across groups and package scopes within the same series, so publishing a single dimension 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 part and the unit nameplate so we can cross-check by part number.

Q6: What happens when inlet resistance rises?
First, energy consumption increases — each 1 kPa of added inlet resistance raises the compression ratio by about 1% and unit energy consumption by about 1%. Second, inlet volume drops, reducing unit discharge. Continuing past the replacement threshold saves less on the element than it costs in extra electricity.

Q7: Can an alternative part be used?
Yes, but three points 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 units. When sourcing alternatives, provide photos of the old part together with 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, and whether the seal face is compressed or rolled. Also check the intake depression gauge impulse line for blockage to avoid misjudgment.

Q9: How should spare parts be stored?
Store dry, ventilated and out of direct light, protected from moisture, rain and heavy loads. Moisture reduces media strength; compression deforms 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 unit often carries both an inlet-stage and a downstream clean-stage element, with different part numbers and mounting positions. Always confirm whether you need the inlet stage or the clean stage — filtration rating, materials and seal type differ between them.

Compatible Machines

This part is for Ingersoll Rand centrifugal air compressors:

• Machine type: centrifugal air compressor
• Product line: Ingersoll Rand centrifugal (CC)
• Series: MSG TURBO-AIR / MSG Centac
• Part-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): 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 similar high-pressure units; packaged systems — dryers, filters and air receivers associated with the above.

Why Verify by Part Number, Not Machine Model

Centrifugal units are supplied as project-based packages: the intake assembly configuration, downstream treatment scope and connection dimensions can differ between projects for the same machine model. A single unit also carries both inlet-stage and downstream clean-stage elements with different part numbers. Selection should therefore be based on: (1) the part number stamped on the old element, (2) the unit nameplate, and (3) 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 ordered number.
2. Read the model and group designation on the unit nameplate and compare with that unit's parts manual.
3. Confirm the old element's mounting position (inlet stage / clean stage) — the two are not interchangeable.

If verification is still inconclusive, provide a nameplate photo, a photo of the old element including the stamped part number, and the mounting position. We will cross-check by part number before confirming.

Cross-series note: centrifugal 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 causes seal failure.

Related Components

Components maintained on the same interval or in the same air path section of the Ingersoll Rand centrifugal product line:

• Sterile filter element — 47722478001. Downstream sterile-grade filtration, removing residual microorganisms and particles from compressed air for higher cleanliness requirements. A different filtration stage from the inlet element; part numbers are not interchangeable — confirm mounting position at replacement.
• Air filter assembly (housing). Carries and locates the inlet element. Check clamps, seal faces and outlet end for deformation and corrosion.
• Intake depression gauge / differential pressure gauge. Displays inlet resistance and is the final criterion for the replacement interval. Check the impulse line periodically for blockage — a blocked line gives a falsely 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 the centrifugal unit's gearbox and bearing lubrication system (not the compression chamber). Replace per the unit parts manual interval and inspect alongside the inlet element.

Paired replacement guidance: inspect the inlet element, downstream clean element and seals together, and decide each on its own criteria. The inlet and downstream clean elements have different intervals (the downstream part is typically judged by cleanliness requirement rather than dust loading), so synchronized replacement is not required.

For exact part numbers: items listed without a part number should be taken from the unit-specific parts manual. Centrifugal units are packaged per project, and the accessory part numbers listed in the manual correspond to the serial number of the applied unit; they should not be carried across projects.