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

Product Overview

67754101 is the 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, and acts as the particle barrier protecting impeller blades and intercooler passages.

This element is noticeably larger and heavier than standard screw-compressor air filters: approximately 5.4 kg (11.94 lbs) net per piece, roughly two to three times the weight of a typical rotary screw element (1–3 kg). That reflects the high inlet volume of Centac machines, where a larger filtration area is required to keep face velocity and pressure drop low.

Centrifugal compressors are 100% oil-free: there is no lubricating oil in the compression chamber to carry contaminants away. Dust that enters deposits on the impeller, diffuser and intercooler. Impeller fouling changes dynamic balance and aerodynamic efficiency; intercooler tube fouling raises interstage temperature and reduces overall efficiency. Because Centac units are often continuous-duty main machines, one unplanned shutdown usually costs far more than the filter 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 / Note
Filtration Rating	5–10 μm
Filtration Efficiency	≥98% for particles ≥5 μm
Filter Class	Not classified under EN 779 HVAC standards; centrifugal inlet elements are characterised by efficiency, inlet resistance and dust holding capacity per ISO 5011

Centac impellers run at tens of thousands of rpm with narrow blade passages, so particle impact velocity is much higher than in a screw rotor. Intercooler tube fouling requires shutdown and disassembly to clean — unplanned overhaul work.

Flow and Pressure Drop

Parameter	Value / Note
Initial Pressure Drop	Approx. 0.5–1.0 kPa (approx. 50–100 mmH₂O)
Operating Differential Range	From new-element initial resistance to alarm resistance
Alarm / Final Resistance	Determined by the unit's inlet differential pressure gauge
Pressure Drop vs. Energy	Rising inlet resistance lowers inlet air density, forcing higher power to hold pressure and flow, which raises specific power

Because Centac is a centrifugal machine, its delivery capacity depends on inlet air density. As the element loads with dust, inlet vacuum rises and the air entering the first-stage impeller drops in pressure and density. The unit must then increase speed or power to maintain set discharge pressure and flow. On continuous-duty medium and large machines, this energy penalty usually exceeds the cost of a filter set over a year — which is why Ingersoll Rand fits an inlet differential pressure indicator.

Construction and Materials

Parameter	Value / Note
Media	Imported wood-pulp filter paper (industry-common US HV or Ahlstrom media)
Media Grammage	Approx. 130 g/m²
Inner / Outer Support	Galvanised steel perforated cage (inner cage + outer guard)
End Caps	Metal end caps (galvanised steel) bonded with polyurethane adhesive
Seal	NBR (nitrile) gasket
Bonding	Polyurethane (PU) hot-melt adhesive

Operating Conditions

Parameter	Value / Note
Operating Temperature	−10 to +100 °C
Relative Humidity	≤80% RH, no condensation
Burst Strength	Media burst strength approx. 200–400 kPa (per ISO 2758)
Collapse Resistance	Element must withstand the unit's inlet alarm differential without collapsing
Special Features	No flame-retardant, anti-static or special coating noted for this part number

Service Life and Maintenance

Parameter	Value / Note
Service Life	Approx. 2000 hours
Actual Change Interval	Per 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

Some references also cite an "8000 hours or annually" interval, mostly for rotary screw applications. For Centac centrifugal machines, the inlet differential pressure gauge is the most reliable guide — dust loading varies widely by site.

Applicable Standards

Item	Content
Product Standard	ISO 5011 (inlet air filters for engines and compressors — performance testing): efficiency, inlet resistance and dust holding capacity
Other Common References	ANSI/CAGI ADF 400-1999 (compressed air and gas), ISO 8573-4 (compressed air — particle measurement)
Commonly Cited Test Standards	ISO 2941 / 2942 / 2943 / 3723 / 3724 / 3968
Standard 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 data or the OEM specification sheet
Oil-Free Background	Centac units served by this element are ISO 8573-1 Class 0 oil-free certified; inlet filtration is the first safeguard maintaining that class

Standard Installation and Maintenance Steps

Centrifugal compressor work differs from screw machines: the impeller has high rotational inertia, so the controller must confirm zero speed. Allow 40–60 minutes per job; the 5.4 kg element may require two people or mechanical assistance for safe handling.

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

2. Open the inlet filter housing. The housing is upstream of the inlet guide vanes. Loosen cover latches or fasteners evenly in a diagonal sequence. Criterion: on large housings, support the cover before the last fastener is released to prevent it dropping.

3. Remove the old element and inspect for dust tracks. Draw out the old element, supporting its weight to avoid crushing the media. Check the housing interior for dust track bands — tracks indicate seal bypass, meaning unfiltered air has passed the seal. Criterion: no dust tracks on the interior wall means the seal was effective.

4. Clean the housing and sealing faces. Wipe the interior, base and sealing face with a dry lint-free cloth. Do not blast compressed air into the housing — it drives dust into the inlet passage. Criterion: no loose dust, sealing face flat with no pits or corrosion.

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

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

7. Refit the cover and check the differential pressure gauge lines. Refit the cover and tighten evenly in diagonal stages. Before start-up, confirm the gauge impulse lines are clear, unblocked and not frozen. Criterion: clear lines; a blocked line gives a false "clean" reading and lets the element run past its service life.

8. Start per the centrifugal compressor procedure and verify. Start per the unit's procedure. Once stable, read inlet differential pressure — it should return to the clean-element baseline — and 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 more damaging on a centrifugal machine. A screw compressor still has oil to carry away some particles; a centrifugal compression chamber is oil-free, so particles all deposit on the impeller and coolers. One seal failure can mean one impeller dynamic balance correction.

FAQ

Which machines use 67754101?
Ingersoll Rand Centac centrifugal air compressors — Centac, Centac C series and CN series. The Centac family spans a wide model range, so exact fitment requires the unit nameplate and serial number.

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

How much does element fouling affect centrifugal efficiency?
Rising inlet vacuum lowers inlet density, so the unit must increase power to hold pressure and flow, raising specific power. On continuous-duty Centac machines, this energy cost over a year usually exceeds the filter 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 — worse than not changing it.

What else should I check when changing the element?
Inlet guide vane linkage, intake silencer, intercooler tube bundles and housing sealing faces. Water-cooled units also need the cooler water side checked for scaling, which directly affects interstage temperature. Always check that the differential pressure gauge impulse lines are clear.

Can this element be interchanged with a screw compressor air filter?
No. At approximately 5.4 kg it is two to three times the weight of a screw compressor element, and its dimensions, filtration area and resistance characteristics are designed for the high inlet volume of a centrifugal machine. They are not interchangeable.

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

How do I confirm dimensions?
Measure the old element (outside diameter, inside diameter and height) or obtain a specification drawing from Ingersoll Rand. Do not cross-reference 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 quotation against current stock and sailing schedules.

How do I confirm the part number 100%?
Three steps: check the unit nameplate to confirm it is a Centac series; provide the serial number for cross-checking against the centrifugal parts catalogue; and read the part number on the old element body. The third step is the most reliable.

Compatible Models

This part number fits Ingersoll Rand Centac centrifugal air compressors:

No.	Compatible Model	Note
1	Centac	Main centrifugal series, multi-stage multi-pinion gear drive
2	Centac C series	Common models C400, C700, C700e, C1000, C2000, C3000 and larger

Centac is Ingersoll Rand's centrifugal compressed air machine brand, using multi-pinion internal gear transmission and multi-stage compression, with output covering roughly 720–51,000 m³/h (by model) and pressures around 0.7–22.5 bar. Units are 100% oil-free, generally ISO 8573-1 Class 0 certified, and widely used in electronics, pharmaceutical, petrochemical and textile industries where air quality is critical.

• The table is a compatibility range; individual fitment must be confirmed by unit nameplate and serial number.
• Large Centac units often use multiple elements in the inlet system; the number per unit varies by model, so confirm the quantity before ordering.
• If unsure which series your unit belongs to, send a nameplate photo and we will cross-check by serial number.

Related Parts

Seven components in the Centac inlet and lubrication systems are maintained on a similar cycle to the air filter. Check the Centac parts manual for specific part numbers.

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

Paired replacement advice: Centrifugal maintenance value centres on efficiency retention. At each inlet element change, also inspect the differential pressure gauge, guide vane mechanism and intercooler condition to make full use of the shutdown window. Cooler cleaning and impeller inspection should be part of the annual planned maintenance schedule rather than waiting for a clear efficiency drop.