Ingersoll Rand 67754101 Centac Inlet Air Filter Element | OEM Centrifugal Compressor Part

Product Overview

67754101 is the genuine inlet air filter element (Element, Inlet Air Filter) for Ingersoll Rand Centac centrifugal air compressors. It installs inside the inlet filter housing, upstream of the inlet guide vanes and the first-stage impeller.

Centrifugal compressors accelerate air through a high-speed impeller and convert that velocity into pressure in the diffuser. Air must be clean before it reaches the first-stage impeller — the inlet element is the particle barrier protecting the impeller blades and intercooler passages.

This element is noticeably larger and heavier than a typical screw compressor filter: approximately 5.4 kg (11.94 lbs) net, two to three times the weight of a screw compressor air filter (usually 1–3 kg). That reflects the high intake volumes of Centac machines, which can range from tens to hundreds of cubic metres per minute. The larger filtration area keeps face velocity and pressure drop low.

Centrifugal machines are 100% oil-free. There is no lubricating oil in the compression chamber to carry contaminants away, so any dust that enters deposits on the impeller, diffuser and intercooler. Fouling on the impeller affects dynamic balance and aerodynamic efficiency; fouling on intercooler tube bundles raises interstage temperature and directly reduces overall efficiency. Centac units are typically continuous-duty assets, and the cost of an unplanned shutdown usually exceeds the cost of the element itself.

Core Specifications

Item	Value
Part number	67754101
Description	Element, Inlet Air Filter
Brand	Ingersoll Rand
Compatible models	Centac, Centac C Series, CN Series centrifugal compressors
Manual reference	1X9428
Construction	Dry disposable inlet element
Net weight	Approx. 5.4 kg (11.94 lbs)
Filtration rating	5–10 μm
Filtration efficiency	≥98%
Recommended change interval	Approx. 2000 hours, or per inlet differential pressure gauge

Technical Parameters

Filtration Performance

Parameter	Value / Notes
Filtration rating	5–10 μm
Filtration efficiency	≥98% for particles ≥5 μm
Filter class	Not classified under EN 779 (HVAC filters). Centrifugal inlet elements are characterised per ISO 5011 by efficiency, intake resistance and dust-holding capacity.

Why centrifugal compressors are more sensitive to inlet cleanliness: Centac impellers run at tens of thousands of rpm with narrow blade passages, so particle impact velocity is far higher than in a screw rotor. A particle of the same size causes more erosion. Once intercooler tubes foul, cleaning requires shutdown and disassembly — unplanned overhaul work.

Flow and Pressure Drop

Parameter	Value / Notes
Initial pressure drop	Approx. 0.5–1.0 kPa (approx. 50–100 mmH₂O)
Operating differential range	From clean-element baseline to alarm resistance
Alarm / final resistance	Determined by the machine's inlet differential pressure gauge
Pressure drop vs. energy	Higher intake resistance → lower intake air density → higher power to maintain pressure and flow → higher specific power

Centac is a centrifugal machine, so its delivery capacity depends on intake air density. As the element loads with dust, negative intake pressure rises and both the pressure and density of air entering the first-stage impeller fall. To hold discharge pressure and flow, the machine must increase speed or power, raising specific power. For medium and large continuous-duty centrifugal units, this energy penalty over a year typically far exceeds the cost of the element — which is why Ingersoll Rand fits an inlet differential pressure indicator.

Construction and Materials

Parameter	Value / Notes
Construction	Cylindrical element, installed in the filter housing
Net weight	Approx. 5.4 kg (11.94 lbs)
Installation interface	Fits Centac inlet filter housing, face-sealed under axial compression
Sealing	Face seal (axial compression)
Media	Imported wood-pulp filter paper (industry-common US HV or Ahlstrom media)
Media weight	Approx. 130 g/m²
Inner / outer support	Galvanised steel perforated cage (inner cage + outer guard)
End caps	Metal end caps (galvanised steel) with polyurethane bonding
Seal	NBR (nitrile rubber) gasket
Bonding	Polyurethane (PU) hot-melt adhesive

Operating Limits and Service Life

Parameter	Value / Notes
Operating temperature	−10 to +100 °C
Relative humidity	≤80% RH, no condensation
Burst strength	Media burst approx. 200–400 kPa (per ISO 2758 paper burst test)
Collapse resistance	Element must withstand the machine's inlet alarm differential without collapsing
Service life	Approx. 2000 hours
Actual change interval	Per the machine's inlet differential pressure gauge; shorten in coastal (salt mist), desert (fine dust) or industrial (process dust) environments
Shelf life	Approx. 2–3 years, unopened, dry and ventilated storage

On change intervals: Besides the 2000-hour reference, some sources suggest 8000 hours or annually (mainly for rotary screw machines). For Centac centrifugal units, the inlet differential pressure gauge is the most reliable indicator — dust loading varies widely by site and can change actual intervals several-fold.

Standards

Item	Content
Applicable product standard	ISO 5011 (inlet air filters for internal combustion engines and compressors — performance testing), evaluating efficiency, intake resistance and dust-holding capacity
Other commonly cited standards	ANSI/CAGI ADF 400-1999 (compressed air and gas), ISO 8573-4 (compressed air — particle measurement)
Industry test standards often quoted	ISO 2941 / 2942 / 2943 / 3723 / 3724 / 3968
Applicability note	The ISO 29xx / 37xx series are general test methods for hydraulic fluid power filter elements. If a supplier can only provide hydraulic filter standards, request ISO 5011 or the OEM specification sheet.
Oil-free certification context	Centac units served by this element are ISO 8573-1 Class 0 oil-free certified; inlet filtration is the first line of defence for maintaining that class.

Installation Steps

Centrifugal compressor work differs from screw machines: the impeller has significant rotational inertia, so the controller must confirm zero speed. A single job takes about 40–60 minutes; depending on housing size, two people or mechanical assistance may be needed (the element weighs 5.4 kg and must be handled and lifted securely).

1. Shut down, confirm zero speed, lock out/tag out. Stop the machine and wait for the controller's zero-speed confirmation (do not judge by sound). Isolate the main power and apply lockout/tagout. Criterion: controller shows zero speed, no coasting sound.

2. Open the inlet filter housing. The housing sits upstream of the inlet guide vanes. Loosen the end-cover clamps or fasteners evenly in a diagonal sequence. Criterion: on large housings, support the cover before releasing the last fastener to prevent it dropping suddenly.

3. Remove the old element and inspect the housing for dust tracks. Pull out the old element — it is heavy, so support it and avoid crushing the media. Look for dust tracks on the housing inner wall; these indicate seal bypass, where unfiltered air has passed around the seal. Criterion: no dust tracks means the seal was effective.

4. Clean the housing and sealing face. Wipe the inner wall, base and sealing face with a dry, lint-free cloth. Do not blow compressed air hard into the housing — this drives dust into the intake passage. Criterion: no loose dust inside, sealing face flat with no pits or corrosion.

5. Verify the new element. Compare item by item with the old part: part number, dimensions, seal integrity, undamaged media. Criterion: part number and dimensions must match before installation; confirm dimensions by measurement (see Section 3).

6. Install the new element and confirm seating. Place the 67754101 into the housing, confirm it is fully seated, the sealing face is in contact with no trapped material, and the element is centred without skew. Criterion: even compression marks around the sealing face.

7. Refit the cover and check the differential gauge impulse lines. Refit the cover and tighten evenly in a diagonal sequence in stages. Before start-up, confirm the inlet differential gauge impulse lines are clear, not blocked and not frozen. Criterion: lines clear; a blocked line gives a false "clean" reading and leads to over-extended element use.

8. Start per the centrifugal compressor procedure and verify. Start according to the machine's procedure. Once stable, read the inlet differential — it should return to the clean-element baseline range; listen for air leaks at the housing. Criterion: normal differential reading, no abnormal noise; record date, running hours and differential reading.

Centrifugal-specific rule: Seal bypass is amplified on centrifugal machines. Screw compressors still have oil to carry away some particles; centrifugal compression chambers are oil-free, so all particles deposit on the impeller and coolers — a single seal failure can mean an impeller dynamic balance correction.

FAQ

Which machines use 67754101?
Ingersoll Rand Centac centrifugal air compressors: Centac, Centac C Series and CN Series. The Centac range is broad, so exact fitment requires the machine nameplate and serial number.

How do I know when to replace it?
Two ways: (1) read the machine's inlet differential pressure gauge (most reliable, reflects actual dust loading); (2) use the 2000-hour reference interval. The gauge takes priority — dust loading varies greatly by site, so a fixed interval either wastes element life or over-extends it.

How much does a loaded element affect centrifugal compressor efficiency?
Higher intake negative pressure lowers intake air density, so the machine must increase power to maintain pressure and flow, raising specific power. Centac is a continuous-duty medium-to-large machine, and this annual energy penalty usually far exceeds the element cost.

Can I blow it clean and reuse it?
No. This is a dry disposable element and is not designed to be cleaned. Reverse blowing with compressed air damages the media fibre structure and creates invisible channels that let unfiltered air pass — more dangerous than not changing it.

What else should I check when replacing the element?
The inlet guide vane linkage, intake silencer, intercooler tube bundles and housing sealing face. On water-cooled machines, also check the cooler water side for scaling, which directly affects interstage temperature. Always check that the differential gauge impulse lines are clear.

Can this element be interchanged with a screw compressor air filter?
No. At approximately 5.4 kg net, it is two to three times the weight of a screw compressor element. Its dimensions, filtration area and resistance characteristics are designed for the high intake volumes of centrifugal machines; the two are not interchangeable.

Are 67754101 and 67765362 the same part?
No. Both names contain "inlet air filter" (67754101 = Element, Inlet Air Filter; 67765362 = Intake Air Filter Core), but the part numbers differ. Before ordering, read the number on the old part itself — do not judge by name.

How do I confirm dimensions?
Measure the old element (outside diameter, inside diameter and height) or request a specification drawing from Ingersoll Rand. Do not match other part numbers by weight or appearance alone.

Is it in stock and what is the lead time?
Regular stock items ship within 24 hours. Southeast Asia approx. 3–7 days; Middle East approx. 7–10 days; Africa and Latin America approx. 10–18 days; Russia/Belarus approx. 10–15 days. Confirm at the time of inquiry for current stock and sailing schedules.

How do I confirm the part number 100%?
Three steps: (1) check the machine nameplate to confirm it is a Centac series; (2) provide the serial number so we can cross-check the centrifugal parts catalogue; (3) read the part number on the old element. Step 3 is the most reliable.

Compatible Models

This part number fits Ingersoll Rand Centac centrifugal air compressors. Compatibility range:

No.	Compatible models	Notes
1	Centac	Main centrifugal series, including multi-stage, multi-shaft geared construction
2	Centac C Series	Common models include C400, C700, C700e, C1000, C2000, C3000 and others

Background on Centac machines

Centac is Ingersoll Rand's centrifugal compressed air machine brand, using multi-shaft internal gear transmission and multi-stage compression. Output flow covers approximately 720–51,000 m³/h depending on model, with pressure from approximately 0.7–22.5 bar. The units are 100% oil-free and generally hold ISO 8573-1 Class 0 oil-free certification. They are widely used in electronics, pharmaceuticals, petrochemicals and textiles, where air purity requirements are high.

Reading the table

• The table shows the compatibility range; individual fitment must be confirmed by machine nameplate and serial number.
• Large Centac units usually have multiple elements in the intake system; the number per machine depends on the model. Confirm the element count before ordering.
• If you are unsure which series the machine belongs to, provide a nameplate photo and we will cross-check by serial number.

Related Components

Seven components in the Centac intake and lubrication systems are maintained on the same cycle as the air filter. The table below lists location, function and inspection points; for specific part numbers, refer to the machine's Centac parts manual.

Component	Location	Function	Inspection points
Intake Air Filter Core	Inlet filter housing	A similarly named separate part number (67765362 in local manuals)	Verify the number on the part; do not confuse with 67754101
Differential Pressure Gauge	On the inlet filter housing	Indicates element dust loading; the authoritative basis for change timing	Check the needle returns correctly; impulse lines must be clear and not frozen
Inlet Guide Vane Assembly	Downstream of the filter, upstream of the first-stage impeller	Regulates intake volume and angle for capacity control	Check the linkage for sticking or looseness; vane fouling affects control accuracy
Intake Silencer	On the intake ducting	Reduces intake noise; on some models also straightens airflow	Check for corrosion perforation and detached silencing material
Intercooler Tube Bundles	Between compression stages	Lowers interstage air temperature; a key factor in centrifugal efficiency	Check the air side for fouling; on water-cooled machines also check the water side for scaling
Aftercooler	After the final stage discharge	Cools discharge air to the set temperature	Blocked tubes directly raise discharge temperature
Gearbox and Bearing Lubrication Components	Gear speed-increasing box	Lubricates gears and high-speed bearings (isolated from the compression chamber)	Test oil per machine requirements; monitor oil level and temperature

Companion replacement advice: Centrifugal compressor maintenance value centres on efficiency retention. Each time you replace the inlet element, inspect the inlet differential gauge, guide vane mechanism and intercooler condition together, making full use of the shutdown window. Cooler cleaning and impeller inspection should be part of annual planned maintenance, not left until efficiency visibly drops.