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

Product Overview

67754101 is the inlet air filter element for Ingersoll Rand Centac centrifugal air compressors. It mounts inside the inlet filter housing, upstream of the inlet guide vanes and the first-stage impeller, forming the particle barrier that protects the impeller blades and intercooler passages.

This element is notably larger and heavier than standard screw compressor filters: approximately 5.4 kg (11.94 lbs) net per unit, two to three times the weight of a typical rotary screw inlet filter (usually 1–3 kg). This reflects the high inlet volumes of centrifugal machines, where airflow can reach tens to hundreds of cubic meters per minute and a larger filtration area is needed to keep face velocity and pressure drop low.

Centrifugal compressors depend heavily on inlet filtration. Centac units are 100% oil-free, so no lubricating oil circulates through the compression chamber to carry contaminants away. Dust that enters deposits on the impeller, diffuser, and intercooler. Impeller fouling alters dynamic balance and aerodynamic efficiency, while intercooler tube fouling raises interstage temperatures and reduces overall efficiency. Because Centac units are often continuous-duty workhorses, the cost of one unplanned shutdown usually far exceeds the cost of the filter element itself.

Key Specifications at a Glance

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
Design	Dry disposable inlet element
Net Weight (per unit)	Approx. 5.4 kg (11.94 lbs)
Filtration Rating	5–10 μm
Filtration Efficiency	≥98%
Recommended Replacement	Approx. 2,000 hours or 3 months, 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 standards; centrifugal inlet elements are characterised per ISO 5011 by efficiency, inlet resistance, and dust holding capacity

Why centrifugal compressors are more sensitive to inlet cleanliness: Centac impellers rotate at tens of thousands of rpm, and blade passages are narrow. Particles impact the impeller at much higher relative velocities than in screw rotors, so erosion from the same particle size is more significant. 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)
Alarm / Final Resistance	Determined by the unit's inlet differential pressure gauge
Pressure Drop vs. Energy	Higher inlet resistance → lower inlet air density → higher power required to maintain pressure and flow → higher specific power

Pressure drop directly affects energy consumption. Centac is a centrifugal machine whose delivery capacity depends on inlet air density. As the element loads with dust, inlet vacuum rises, reducing the pressure and density of air entering the first-stage impeller. To maintain discharge pressure and flow, the unit must increase speed or power, raising specific power. For medium-to-large continuous-duty centrifugal units, this energy penalty over a year typically far exceeds the cost of a filter element — which is why Ingersoll Rand fits centrifugal units with inlet differential pressure indication.

Construction, Dimensions, and Installation

Parameter	Value / Notes
Design	Cylindrical inlet element, installed in filter housing
Net Weight (per unit)	Approx. 5.4 kg (11.94 lbs)
Installation Interface	Fits Centac inlet filter housing; axial compression seal at end face
Sealing	End-face seal (axial compression)

Dimensions: Before ordering, confirm dimensions by one of the following: ① measure the old element (outer diameter, inner diameter, height — recommended); ② request the specification drawing from Ingersoll Rand; ③ provide photos and measurements of the old element for our verification. Do not cross-reference by weight or appearance alone.

For reference: this element weighs approx. 5.4 kg, 2–3 times a standard screw compressor inlet filter (1–3 kg), indicating a large centrifugal-duty element. Do not assume interchangeability based on weight.

Materials

Parameter	Value / Notes
Filter Media	Imported wood pulp filter paper (industry-common 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) + polyurethane adhesive
Seal	Nitrile rubber (NBR) seal ring
Bonding	Polyurethane (PU) hot-melt adhesive

Operating Tolerance

Parameter	Value / Notes
Operating Temperature	−10 to +100 °C
Relative Humidity	≤80% RH, non-condensing
Burst Strength	Filter paper burst strength approx. 200–400 kPa (per ISO 2758)
Collapse Resistance	Element should withstand the unit's inlet alarm differential pressure without collapse

Service Life and Maintenance

Parameter	Value / Notes
Service Life	Approx. 2,000 hours or 3 months
Actual Replacement Interval	Based on the unit'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, ventilated storage)

Replacement interval: standard is 2,000 hours or 3 months, whichever comes first. For Centac centrifugal units, the inlet differential pressure gauge reading is the more reliable indicator; actual intervals can vary by a factor of two or more depending on environmental dust loading.

Applicable Standards

Item	Details
Product Standard	ISO 5011 (Inlet air cleaning equipment for internal combustion engines and compressors — performance testing), evaluating efficiency, inlet resistance, and dust holding capacity
Other Common References	ANSI/CAGI ADF 400-1999 (compressed air and gas), ISO 8573-4 (compressed air — solid 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 or the OEM specification sheet as a supplement.
Oil-Free Certification Context	The Centac units this element serves are ISO 8573-1 Class 0 oil-free certified; inlet filtration is the first line of defence in maintaining that oil-free class.

Standard Maintenance and Installation Steps

Centrifugal compressor work differs from screw compressor work: the impeller has significant rotational inertia, so you must wait for the controller to confirm zero speed. A single job takes about 40–60 minutes; depending on housing size, two people or mechanical assistance may be needed (this element weighs 5.4 kg, so safe handling and lifting measures are required).

1. Shut down, confirm zero speed, lock out/tag out. Stop the unit and wait for the controller to confirm zero speed (do not judge by sound). Disconnect main power and apply lockout/tagout. Criterion: controller shows zero speed, no inertial rotation noise.

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

3. Remove the old element and inspect for dust tracks inside the housing. Pull out the old element. It is heavy, so support it carefully and avoid crushing the filter media. Look for dust track bands on the housing inner wall; tracks indicate seal bypass, meaning unfiltered air has bypassed the seal. Criterion: no dust tracks on the inner wall means the seal was good.

4. Clean the housing and sealing surfaces. Wipe the housing inner wall, bottom, and sealing surfaces with a dry lint-free cloth. Do not blow compressed air forcefully into the housing interior (this drives dust into the inlet duct). Criterion: no loose dust on the inner wall; sealing surface flat with no pits or corrosion pitting.

5. Verify the new element. Compare with the old one item by item: part number, dimensions, seal integrity, no damage to filter media. Criterion: all part numbers and dimensions match before installation; dimensions of this element must be confirmed by measurement (see Section 3).

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

7. Refit the end cover and check the differential pressure gauge impulse line. Refit the cover and tighten evenly in a diagonal sequence. Before start-up, confirm the inlet differential pressure gauge impulse line is clear, not blocked, and not frozen. Criterion: line clear; a blocked impulse line gives a false clean reading and allows the element to be used beyond its service life.

8. Start per centrifugal compressor procedure and verify. Start according to the unit's specified procedure. After stable operation, read the inlet differential pressure; it should return to the clean element baseline range. Listen for air leakage at the housing. Criterion: normal differential pressure reading, no abnormal noise; record date, running hours, and differential pressure reading.

Centrifugal-specific rule: the consequences of seal bypass are amplified in centrifugal compressors. Screw compressors have lubricating oil to carry away some particles, but the centrifugal compression chamber is oil-free, so all particles deposit on the impeller and coolers. One seal failure can cost an impeller dynamic balance correction.

Frequently Asked Questions

Which machines use 67754101?

Ingersoll Rand Centac centrifugal air compressors: Centac, Centac C Series, and CN Series. The Centac model lineage is broad, so precise fitment requires verification against the unit nameplate and serial number.

How do I know when to replace it?

Two ways: ① read the unit's inlet differential pressure gauge (most reliable, reflects actual dust loading); ② use 2,000 hours or 3 months as a reference. The gauge reading takes priority because dust loading varies greatly by location; fixed-interval replacement either wastes element life or runs it beyond service.

How much does element fouling affect centrifugal compressor efficiency?

Rising inlet vacuum reduces inlet air density. To maintain pressure and flow, the unit must increase power, raising specific power. Centac is a medium-to-large continuous-duty unit, so this energy penalty over a year typically far exceeds the element cost.

Can I blow it clean and reuse it?

No. This is a dry disposable element, not designed to be cleaned. Back-blowing with compressed air damages the filter media fibre structure and creates invisible channels that let unfiltered air pass — more dangerous than not replacing it.

What else should be checked when replacing the element?

The inlet guide vane linkage, intake silencer, intercooler tube bundles, and housing sealing surfaces. For water-cooled units, also check the cooler water side for scaling, which directly affects interstage temperature. Also be sure to check that the differential pressure gauge impulse line is clear.

Can this element be interchanged with a screw compressor inlet filter?

No. This element weighs approx. 5.4 kg, 2–3 times a screw compressor inlet filter. Its dimensions, filtration area, and resistance characteristics are designed for the high inlet volumes of centrifugal compressors. The two are not interchangeable.

Are 67754101 and 67765362 the same part?

No. Both part names contain "inlet air filter" (67754101 = Element, Inlet Air Filter; 67765362 = Intake Air Filter Core), but they are different part numbers. Before ordering, read the number on the old element itself; do not judge by name.

How do I confirm dimensions?

Confirm dimensions by measuring the old element (outer diameter, inner diameter, height — three items), or request the specification drawing from Ingersoll Rand. Do not cross-reference by weight or appearance alone.

Is it in stock? 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. Exact timing is subject to stock and shipping schedule at the time of inquiry.

How do I confirm the part number 100%?

Three steps: ① check the unit nameplate to confirm it is a Centac series; ② provide the serial number for cross-reference against the centrifugal compressor parts catalogue; ③ read the part number on the old element itself. The third step is the most reliable.

Compatible Models

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

No.	Compatible Model	Notes
1	Centac	Main centrifugal series, including multi-stage multi-shaft gear-driven designs
2	Centac C Series	Common models C400, C700, C700e, C1000, C2000, C3000, etc.
3	CN Series	Another model designation in the Centac family

Background on Centac models: Centac is Ingersoll Rand's centrifugal compressed air machine brand, using multi-shaft internal gear transmission and multi-stage compression, with output flow covering approximately 720–51,000 m³/h (by model) and pressure range approximately 0.7–22.5 bar. The units are 100% oil-free and commonly certified to ISO 8573-1 Class 0, widely used in electronics, pharmaceutical, petrochemical, and textile industries where air purity is critical.

Reading Notes

• The table above is a compatibility range; individual fitment must be confirmed by unit nameplate and serial number.
• Large Centac units typically use multiple filter elements in the inlet system; the number per unit varies by model. Confirm the element configuration quantity before ordering.
• If you are unsure which series the unit belongs to, provide a nameplate photo and we will cross-reference by serial number.

Related Components

Seven components in the Centac centrifugal compressor inlet and lubrication systems are maintained on the same cycle as the inlet filter. They are listed below by location, function, and inspection points. For specific part numbers, refer to the unit's Centac parts manual.

Component	Location	Function	Inspection Points
Intake Air Filter Core	Inlet filter housing	A different part number with a similar name (67765362 in local manuals)	Verify the number on the part when ordering; do not confuse with 67754101
Differential Pressure Gauge	On the inlet filter housing	Indicates element dust loading; authoritative basis for replacement timing	Check that the needle returns properly; impulse line must be clear and not frozen
Inlet Guide Vane Assembly	Downstream of the filter, upstream of the first-stage impeller	Regulates inlet volume and angle for capacity control	Check linkage for binding or looseness; vane fouling affects control accuracy
Intake Silencer	On the inlet duct	Reduces inlet noise; on some models also acts as airflow straightener	Check for corrosion perforation and loose silencing material
Intercooler Tube Bundles	Between compression stages	Reduces interstage air temperature; key to centrifugal efficiency	Check air side for fouling; for water-cooled units, also check water side for scaling
Aftercooler	After 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 compression chamber)	Test oil per unit requirements; monitor oil level and temperature

Recommended companion replacement: maintenance value on centrifugal compressors centres on efficiency retention. We recommend checking the inlet differential pressure gauge, guide vane mechanism, and intercooler condition each time the inlet element is replaced, making full use of the shutdown window. Cooler cleaning and impeller inspection should be included in the annual planned maintenance programme rather than waiting until efficiency visibly drops.