Ingersoll Rand 47722477001 Air Filter Element | MSG Centac Inlet Filter

Product Overview

47722477001 is an inlet air filter element for Ingersoll Rand centrifugal air compressors. It installs inside the intake filter assembly, upstream of the centrifugal impeller inlet. As the first barrier in the air path, it captures dust, sand, 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 designation C675. Centrifugal compressors are designed as 100% oil-free (ISO 8573-1 Class 0); without oil to carry contaminants away, particles deposit on the impeller and cooler surfaces, making inlet filtration more critical than in 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 Replacement	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) do not apply

Flow and Pressure Drop

Parameter	Value / Notes
Rated Air Flow	Must exceed compressor rated inlet flow; match after correcting for discharge volume, inlet 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; on centrifugal units, the intake depression gauge reading is the final criterion
Pressure Drop vs. Energy	Each 1 kPa increase in inlet resistance raises compression ratio by approx. 1%, increasing energy consumption by approx. 1.0%

Pressure drop vs. energy consumption (theoretical, at 0.85 MPa discharge gauge pressure):

Inlet Resistance	Compression Ratio	Energy Increase
0 kPa (new)	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 resistance rises by over 2 kPa, increasing energy consumption by roughly 2%. For high-power, continuous-duty centrifugal compressors, this energy penalty often exceeds the filter cost, so extending service by calendar time rather than resistance is not economical.

Construction and Materials

Parameter	Value / Notes
Filter Media	Cellulose fiber paper, pleated construction
Media Weight	Approx. 130 g/m²
Inner/Outer Support	Galvanized steel perforated mesh, supporting media on both sides
End Caps	Metal or polyurethane, bonded to media
Seal	Polyurethane or NBR rubber, integral or separate from end cap
Adhesive	Polyurethane, securing media to end caps and support

Operating Conditions

Parameter	Value / Notes
Operating Temperature	-10 °C to +80 °C
Relative Humidity	≤90% RH (non-condensing)
Burst / Collapse Pressure	Standard design withstands at least 5 kPa differential without deformation
Special Function	Inlet-stage filtration for oil-free centrifugal compressors, working with downstream clean filter elements to maintain air purity

Service Life and Maintenance

Parameter	Value / Notes
Service Life	2,000 hours or 3 months, whichever comes first
High-Dust Environment	Reduce hours accordingly (e.g., approx. 1,500 hours) and shorten time limit
Shelf Life	Use within 24 months; store in dry, ventilated, dark conditions, avoid moisture and compression
Replacement Criteria	Intake depression gauge reading exceeds limit, or media shows damage, debonding, or seal compression

Standards

Standard	Notes
ISO 5011	Inlet filter efficiency and dust holding capacity test method — performance basis for this air filter type
ISO 8573-1	Compressed air quality classes; this compressor type is Class 0 (100% oil-free)
Note	ISO 2941 / 2942 / 2943 / 3723 / 3724 series are hydraulic filter standards for pressure, burst, and filtration characteristics and do not apply to air filters; they should not be used as performance basis for air filter procurement

Installation and Maintenance Steps

Step 1: Confirm compressor status and spare parts
Check the compressor nameplate model and group designation, and confirm the new filter matches the old part number. Prepare the new filter, clean cloths, and necessary tools.

Step 2: Shut down, depressurize, and lock out
Follow shutdown procedure and wait for full depressurization (centrifugal units have rotational inertia; wait for the controller to confirm zero speed). Disconnect main power and apply lockout/tagout. This step is mandatory.

Step 3: Verify the old part before removal
Before opening the intake filter assembly, read the part number stamped on the old filter end cap and note its installation position. Confirm it matches the new part before proceeding. Inlet and clean sections use different part numbers; this step is critical for error prevention.

Step 4: Remove and inspect the old filter
Lift out the old filter vertically and observe dust distribution and media condition. Replace immediately if media is damaged, perforated, end caps are debonded, or the seal is compressed — even if the service interval has not been reached. Black oily sludge on the surface indicates abnormal oil mist in the inlet; investigate upstream conditions (particularly important for oil-free units).

Step 5: Clean the assembly interior
Wipe the inner walls and bottom with a lint-free cloth. Do not blow compressed air directly into the assembly (this drives dust into the intake). Criterion: no loose dust on inner walls, seal surface flat and free of debris.

Step 6: Install the new filter
Install in the same orientation and position as the old filter, paying attention to seal face direction and compression method. Criterion: no movement after seating, uniform circumferential seal compression.

Step 7: Reassemble and confirm seal
Refit the cover or clamp and tighten evenly per compressor requirements. Check that the intake depression gauge impulse line is clear — a blocked line gives a false "clean" reading, a common source of misdiagnosis.

Step 8: Reset, test run, and record
Reset the maintenance timer, start the compressor at no load, and observe the intake depression gauge reading and running sound. Criterion: gauge stable within compressor limits, no abnormal whistling (often indicates seal bypass). Record the compressor running hours at replacement as the starting point for the next interval.

Frequently Asked Questions

Q1: Which compressor models use 47722477001?
It is used on Ingersoll Rand centrifugal air compressors — MSG TURBO-AIR and MSG Centac series and packaged systems (item-level model code P675, unit group designation C675). Centrifugal units are 100% oil-free. For a specific unit, verify against the nameplate and old part number.

Q2: Can it be used on oil-flooded screw compressors?
Not recommended. This part is an inlet filter for the centrifugal product line, designed for centrifugal intake assembly dimensions and interfaces. Oil-flooded screw compressors use a different part number system; mixing cannot guarantee sealing or filtration performance.

Q3: What is the replacement interval?
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 the reading exceeds limits, regardless of running hours.

Q4: Why are inlet filtration requirements higher for centrifugal compressors than screw compressors?
Centrifugal compressors are oil-free; without oil to carry contaminants away, particles deposit on high-speed impeller and intercooler surfaces. Impeller fouling causes dynamic balance deviation, requiring shutdown and rotor correction. Screw compressors have an oil film that partially carries contaminants, giving greater tolerance for inlet filtration.

Q5: Why are dimensions not listed?
Centrifugal compressors are supplied as project-based packages; intake assembly dimensions vary across groups and package scopes within the same series, and listing a single dimension could mislead procurement. We recommend measuring the old part's outer diameter, inner diameter, total height, and seal type, or providing old part photos and compressor nameplate for part-number cross-reference.

Q6: What happens when inlet resistance increases?
First, energy consumption rises — each 1 kPa increase in inlet resistance raises compression ratio by approximately 1%, increasing energy consumption by approximately 1%. Second, inlet flow decreases, reducing compressor discharge volume. Continuing to use beyond the replacement threshold saves less on filter cost than is spent on extra electricity.

Q7: Can alternative parts be used?
Yes, but three items must be verified: filtration rating, end cap seal type, and dimensions. If an alternative part's seal type does not match the original, bypass occurs — for oil-free centrifugal compressors, bypass means particles enter the impeller directly, a higher risk than for oil-flooded units. When purchasing alternatives, provide old part photos and this part number.

Q8: What if abnormal whistling occurs after installation?
Whistling usually indicates seal bypass — filter not fully seated, deformed seal face, or missing seal. Stop the compressor immediately and recheck: filter seating, seal compression or inversion. Also check the intake depression gauge impulse line for blockage to avoid misdiagnosis.

Q9: What are the storage requirements?
Store in dry, ventilated, dark conditions, protected from moisture, rain, and heavy compression. Moisture reduces media strength; compression deforms the seal fit. Use within 24 months.

Q10: What other filters in the same series are easily confused?
In the Ingersoll Rand centrifugal product line, the same compressor often has both inlet filtration and downstream clean filtration elements with different part numbers and installation positions. Always confirm whether the part is for the inlet or clean section — filtration rating, materials, and seal types differ.

Compatible Compressor Models

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

Item	Content
Compressor 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 Designation	C675
Air Quality Class	100% oil-free, ISO 8573-1 Class 0
Typical Applications	Continuous, clean, oil-free air supply (food & beverage, pharmaceutical, electronics, textile, pneumatic conveying, etc.)

Representative model families (family-level reference; individual fit 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 part-number verification is essential rather than model-based selection
Centrifugal compressors are supplied as project-based packages: the same compressor may have different intake assembly configurations, downstream scope, and interface dimensions across projects. The same compressor also has separate inlet and downstream clean filter elements with different part numbers. Therefore, selection should be based first on the old part number, second on the compressor nameplate, and third on installation position.

Three-step verification method

1. Read the part number stamped on the old filter end cap or support and compare with the ordered part number;
2. Read the model and group designation on the compressor nameplate and compare with the unit parts manual;
3. Confirm the old part's installation position (inlet / clean section) — the two are not interchangeable.

If verification is still uncertain after these three steps, provide compressor nameplate photos, old part photos (including stamped part number), and installation position description. We will cross-reference by part number and confirm.

Cross-series note: Centrifugal compressor filter elements and oil-flooded screw compressor filter elements belong to different part number systems and cannot be interchanged. Screw compressor air filters are designed for external intake assembly dimensions and interfaces; direct substitution will cause seal failure.

Related Components

Components in the Ingersoll Rand centrifugal product line air intake and air path system that share the same service interval or section:

Component	Part Number	Function	Inspection Points
Sterile filter element	47722478001	Downstream sterile-grade filtration, further removing microorganisms and particles from compressed air for higher-purity applications	Different filtration section from inlet filter; part numbers not interchangeable; confirm installation position when replacing
Air filter assembly (housing)	—	Housing assembly that holds and secures the inlet filter element	Check clamps, seal surfaces, and outlet end for deformation or corrosion
Intake depression gauge / differential gauge	—	Displays inlet resistance; final criterion for replacement interval	Regularly check impulse line for blockage — blockage gives a false "clean" reading
Seals	—	Prevents bypass between filter and assembly	Inspect together with filter; replace if compressed, hardened, or missing
Compressor lubricant and oil filter	—	For gearbox and bearing lubrication system (not compression chamber oil)	Replace per compressor parts manual intervals; inspect together with inlet filter

Recommended companion replacement: Inspect inlet filter, downstream clean filter, and seals together, and decide replacement separately based on each component's criteria. Inlet and downstream clean filters have different replacement intervals (downstream parts are typically judged by cleanliness requirements rather than dust loading) and do not need to be replaced simultaneously.

For specific part numbers: Items marked "—" above should be referenced from the compressor's specific parts manual — centrifugal compressors are project-packaged, and listed companion part numbers correspond to the application unit's serial number and should not be applied across projects.