Ingersoll Rand 67754101 Inlet Air Filter Element | Centac Centrifugal Compressor

Product Overview

67754101 is the inlet air filter element 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. Because centrifugal machines accelerate air at very high impeller speeds, the element acts as the primary particle barrier protecting impeller blades and intercooler passages.

At approximately 5.4 kg (11.94 lb) net weight per element, this filter is two to three times heavier than a typical rotary-screw air filter element (usually 1–3 kg). That reflects the high inlet flow of Centac machines — inlet volumes can reach tens to hundreds of cubic metres per minute, so a larger filtration area is required to keep face velocity and pressure drop low.

Centrifugal compressors are 100% oil-free. With no lubricating oil circulating through the compression chamber to carry contaminants away, any dust that enters deposits on the impeller, diffuser and intercooler. Fouling alters impeller dynamic balance and aerodynamic efficiency, while intercooler tube fouling raises interstage temperatures and reduces overall efficiency. Centac units are typically continuous-duty assets, so the cost of one unplanned stop usually far exceeds the cost of the filter itself.

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 per element	Approx. 5.4 kg (11.94 lb)
Filtration rating	5–10 μm
Filtration efficiency	≥98%
Recommended change interval	Approx. 2000 hours, or per inlet differential pressure gauge

Technical Specifications

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 under ISO 5011 by efficiency, inlet restriction and dust-holding capacity

Centac impellers rotate at tens of thousands of rpm and blade passages are narrow, so the relative impact velocity of particles is much higher than in a screw compressor. Intercooler tube fouling requires shutdown and disassembly to clean — 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 new-element baseline to alarm restriction
Alarm / final restriction	Determined by the machine inlet differential pressure gauge
Pressure drop vs. energy	Rising inlet restriction lowers inlet air density; the machine draws more power to hold pressure and flow, raising specific power

Because Centac is a centrifugal machine, its delivery capacity depends on inlet air density. As dust loading raises inlet vacuum, both the pressure and density of air entering the first-stage impeller fall. To maintain discharge pressure and flow, the unit must increase speed or power, and specific power rises. On large continuous-duty centrifugal machines, this annual energy penalty usually exceeds the cost of a filter element — which is why Ingersoll Rand fits inlet differential pressure indication.

Construction and installation

Parameter	Value / Notes
Construction	Cylindrical inlet element, installed in the filter housing
Net weight per element	Approx. 5.4 kg (11.94 lb)
Mounting interface	Fits Centac inlet filter housing; axial face compression seal
Sealing	Face seal (axial compression)

For reference: at approx. 5.4 kg, this element is 2–3 times the weight of a standard screw compressor air filter (1–3 kg). Do not cross-reference other part numbers by weight alone.

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) with polyurethane adhesive
Seal	Nitrile rubber (NBR) gasket
Bonding	Polyurethane (PU) hot-melt adhesive

Operating tolerances

Parameter	Value / Notes
Operating temperature	−10 to +100 °C
Relative humidity	≤80% RH, no condensation
Burst strength	Filter paper approx. 200–400 kPa (per ISO 2758 paper burst test)
Collapse resistance	Element withstands machine inlet alarm differential without collapse
Special features	No flame-retardant, anti-static or special coating noted for this model

Service life and maintenance

Parameter	Value / Notes
Service life	Approx. 2000 hours
Actual change interval	Per machine 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

Besides the 2000-hour reference, an alternative guidance of “every 8000 hours or annually” is sometimes quoted, mainly for rotary screw applications. For Centac centrifugal machines, the inlet differential pressure gauge reading is the most reliable basis — dust loading varies widely by site and can change actual intervals several-fold.

Applicable standards

Item	Content
Product standard	ISO 5011 (inlet air cleaners for engines and compressors — performance testing), evaluating efficiency, inlet restriction 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-cited test standards	ISO 2941 / 2942 / 2943 / 3723 / 3724 / 3968
Standard applicability note	The ISO 29xx / 37xx series are in fact general test methods for hydraulic fluid power filter elements. If a supplier can only offer hydraulic filter standards, request ISO 5011 or the OEM specification sheet.
Oil-free certification context	The Centac machines served by this element are ISO 8573-1 Class 0 oil-free certified; inlet filtration is the first safeguard maintaining that oil-free class.

Standard Maintenance and Installation Steps

Centrifugal work differs from screw compressor work: the impeller has high rotational inertia, and the controller must confirm zero speed. Allow 40–60 minutes per job; depending on housing size, two people or mechanical assistance may be needed (the element weighs 5.4 kg, so secure lifting and support is required).

1. Shut down, confirm zero speed, lock out/tag out. Stop the machine and wait for the controller 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 is upstream of the inlet guide vanes. Loosen cover latches 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 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 to avoid crushing the filter paper. Look for dust tracks on the housing inner wall — these indicate seal bypass, meaning unfiltered air has bypassed the seal. Criterion: no dust tracks on the inner wall 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 interior (this drives dust into the inlet duct). Criterion: no loose dust on the inner wall; sealing face flat, free of dents or corrosion pitting.
5. Verify the new element. Compare against the old part item by item: part number, dimensions, seal integrity, undamaged filter paper. Criterion: part number and dimensions must all match before installation; measure this element’s dimensions on site (see Section 3).
6. Install the new element and confirm seating. Place 67754101 into the housing and confirm it is fully seated at the base, the sealing face contacts evenly 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 pressure gauge impulse line. Refit the cover and tighten evenly in a diagonal sequence in stages. 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 lets the element run past its service life.
8. Start per the centrifugal machine procedure and verify. Start according to the machine’s specified procedure. Once stable, read inlet differential pressure; it should return to the clean-element baseline range, 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: the consequences of seal bypass are amplified 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 balancing job.

Frequently Asked Questions

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 change it?
Two ways: (1) read the machine inlet differential pressure gauge (most reliable, reflects actual dust loading); (2) use the 2000-hour interval as a reference. The gauge takes priority — dust loading varies greatly by site, so a fixed interval either wastes service life or runs past it.

How much does dust loading affect centrifugal efficiency?
Rising inlet vacuum lowers inlet air density, and the machine must draw more power to hold pressure and flow, raising specific power. Centac is a large continuous-duty machine, so this annual energy cost usually far exceeds the element cost.

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

What else should I check when changing the element?
The inlet guide vane linkage, intake silencer, intercooler tube bundles and housing sealing face. On water-cooled models, also check the cooler water side for scaling, which directly affects interstage temperature. Also be sure to check the differential pressure gauge impulse line is clear.

Can this element be interchanged with a screw compressor air filter?
No. At approx. 5.4 kg, it is 2–3 times the weight of a screw compressor air filter, and its dimensions, filtration area and restriction characteristics are designed for the high inlet flow of a centrifugal machine. The two are not interchangeable.

Are 67754101 and 67765362 the same part?
No. Both descriptions 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?
Use the measured old part (outside diameter, inside diameter and height) or request 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 stock and shipping schedule at the time of enquiry.

How can I be 100% sure of the part number?
Three steps: (1) check the machine nameplate to confirm it is a Centac series; (2) provide the serial number so we can cross-check against the centrifugal parts catalogue; (3) read the part number on the old element itself. Step 3 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 geared construction
2	Centac C series	Common models include C400, C700, C700e, C1000, C2000, C3000

Background on Centac models

Centac is Ingersoll Rand’s centrifugal compressed air machine brand, using multi-shaft internal gear drive and multi-stage compression, with output flow covering approx. 720–51,000 m³/h (depending on model) and pressure range approx. 0.7–22.5 bar. The units are 100% oil-free and generally hold ISO 8573-1 Class 0 oil-free certification, widely used in electronics, pharmaceutical, petrochemical and textile industries where air quality is critical.

How to read the table

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

Related Components

Seven components in the Centac inlet and lubrication systems are typically maintained on the same cycle as the air filter. They are listed below by location, function and inspection point. For specific part numbers, refer to the machine Centac parts manual.

Component	Location	Function	Inspection point
Intake air filter core	Inlet filter housing	A separate part number with a similar name (67765362 seen in local manuals)	Verify the part number on the old part; do not confuse with 67754101
Differential pressure gauge	On the inlet filter housing	Indicates element dust loading; authoritative basis for change timing	Check the needle returns correctly; impulse line must be clear and not frozen
Inlet guide vane assembly	Downstream of filter, upstream of first-stage impeller	Regulates inlet flow and angle for capacity control	Check linkage for sticking or looseness; vane fouling affects control accuracy
Intake silencer	On the inlet duct	Reduces inlet noise; on some models also acts as flow straightener	Check for corrosion perforation or loose silencing material
Intercooler tube bundles	Between compression stages	Lowers interstage air temperature; key to centrifugal efficiency	Check air-side fouling; on water-cooled models also check water-side scaling
Aftercooler	After final stage discharge	Cools discharge air to the set temperature	Tube blockage directly raises discharge temperature
Gearbox and bearing lubrication system components	Gear speed-increasing box	Lubricates gears and high-speed bearings (isolated from compression chamber)	Test oil per machine requirements; monitor oil level and oil temperature

Paired replacement advice: centrifugal maintenance value is concentrated in efficiency retention. Each time you change the inlet element, also check 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 programme, not deferred until efficiency visibly drops.