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

Product Overview

67754101 is the inlet air filter element for Ingersoll Rand Centac centrifugal air compressors (Element, Inlet Air Filter). 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 velocity into pressure in the diffuser. Air must be clean before it reaches the first stage: the inlet element is the particle barrier that protects the impeller blades and the intercooler passages.

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

Centrifugal machines depend on inlet filtration more heavily than screw compressors. Centac units are 100% oil-free: there is no lubricating oil circulating through the compression chamber to carry contaminants away. Dust that enters the machine deposits on the impeller, diffuser and intercooler. Impeller fouling changes dynamic balance and aerodynamic efficiency; intercooler tube fouling raises interstage temperature and lowers overall efficiency. Centac units are usually continuous-duty assets, and the cost of one unplanned shutdown typically exceeds the cost of the element itself.

Core Specifications

Item	Value
Part number	67754101
Description	Element, Inlet Air Filter
Brand	Ingersoll Rand
Machine compatibility	Centac, Centac C Series, CN Series centrifugal compressors
Manual reference	1X9428
Construction	Dry disposable inlet element
Net weight (each)	Approx. 5.4 kg (11.94 lb)
Filtration rating	5–10 μm
Filtration efficiency	≥98%
Recommended change interval	Approx. 2,000 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 filter standards; centrifugal inlet elements are characterised under ISO 5011 by efficiency, inlet resistance and dust holding capacity

Centac impellers rotate at tens of thousands of rpm through narrow blade passages, so particles strike the impeller at far higher relative velocity than in a screw rotor. Erosion from a given particle size is more significant in a centrifugal machine, and cleaning a fouled intercooler bundle 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 inlet differential pressure gauge
Pressure drop vs. energy	Rising inlet resistance lowers inlet air density; the machine draws more power to hold pressure and flow, increasing specific power

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

Construction and Materials

Parameter	Value / Notes
Media	Imported wood-pulp filter paper (industry-common US HV or Ahlstrom media)
Media weight	Approx. 130 g/m²
Support	Galvanised steel perforated inner core and outer guard
End caps	Metal end caps (galvanised steel) with polyurethane bonding
Seal	NBR (nitrile) gasket
Adhesive	Polyurethane (PU) hot-melt

Operating Limits

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

Service Life and Storage

Parameter	Value / Notes
Service life	Approx. 2,000 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

Some references cite an 8,000-hour or annual interval, but that guidance is generally applied to rotary screw machines. For Centac centrifugal units, the inlet differential pressure gauge reading is the most reliable basis — dust loading varies widely by site and can change the practical interval several-fold.

Applicable Standards

Item	Content
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 — 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
Oil-free context	The Centac machines this element serves are ISO 8573-1 Class 0 oil-free certified; inlet filtration is the first line of defence for maintaining that class

Installation and Maintenance Procedure

Centrifugal machines differ from screw compressors: the impeller has high rotational inertia, and the controller must confirm zero speed. Allow about 40–60 minutes per job; two people or mechanical assistance may be needed depending on housing size (the element weighs 5.4 kg and must be handled and supported securely).

1. Shut down, confirm zero speed, lock out/tag out. Stop the machine and wait for the controller to confirm zero speed (do not judge by sound). Isolate the main power and apply lockout/tagout. Criterion: controller shows zero speed, no coasting noise.
2. Open the inlet filter housing. The housing is upstream of the inlet guide vanes. Release cap latches or fasteners evenly in a diagonal sequence. Criterion: on large housings, support the end cover before releasing the last fastener to prevent it dropping.
3. Remove the old element and inspect the housing for dust tracks. Withdraw the old element, supporting its weight to avoid crushing the media. Look for dust tracks on the housing interior — these indicate seal bypass, where unfiltered air has passed the seal. Criterion: no dust tracks means the seal was effective.
4. Clean the housing and sealing surfaces. Wipe the interior, base and sealing face with a dry lint-free cloth. Do not blow compressed air into the housing interior — this drives dust into the inlet duct. Criterion: no loose dust, sealing face flat with no dents or corrosion pitting.
5. Verify the new element. Compare against the old part: part number, dimensions, seal integrity, undamaged media. Criterion: part number and dimensions must match before installation; measure this element to confirm (see Construction section).
6. Install the new element and confirm seating. Place the 67754101 into the housing, confirm it is fully seated at the base, the seal is mated without trapped material, and the element is centred without skew. Criterion: even seal compression all around.
7. Refit the end cover and check the differential pressure lines. Refit the cover and tighten evenly in a diagonal sequence in stages. Before start-up, confirm the inlet differential pressure gauge impulse lines are clear, unblocked and not frozen. Criterion: clear lines; a blocked line gives a false "clean" reading and can lead to over-extended element use.
8. Start per the centrifugal machine procedure and verify. Start according to the machine 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 the date, running hours and differential reading.

Centrifugal-specific rule: the consequences of seal bypass are amplified on a centrifugal machine. A screw compressor has oil to carry away some particles; a centrifugal compression chamber is oil-free, so particles deposit entirely 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 spans many models, so exact fitment requires the machine nameplate and serial number.

How do I know when to change it?
Two methods: (1) read the machine inlet differential pressure gauge — the most reliable, since it reflects actual dust loading; (2) use the 2,000-hour interval as a reference. The gauge reading takes priority: dust loading varies greatly by site, and a fixed interval either wastes element life or runs it too long.

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

Can I blow it clean and reuse it?
No. This is a dry disposable element, not designed for cleaning. Blowing it out with compressed air damages the media fibres and creates invisible channels that let unfiltered air pass — more dangerous than not changing it at all.

What else should I check when replacing the element?
The inlet guide vane linkage, intake silencer, intercooler tube bundles and housing sealing faces. On water-cooled machines, also check the cooler water side for scaling, which directly affects interstage temperature. Always check that the differential pressure 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 air filter. Its dimensions, filtration area and resistance characteristics are designed for the high inlet volume of a centrifugal machine; 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. Read the number on the old element itself before ordering — 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 assume interchangeability from weight or appearance.

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

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

Machine Compatibility

This part number fits Ingersoll Rand Centac centrifugal air compressors within the following range:

No.	Machine	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 larger

Centac is Ingersoll Rand's centrifugal compressed-air brand, using multi-shaft internal gearing and multi-stage compression. Output covers approximately 720–51,000 m³/h depending on model, with pressure ranges around 0.7–22.5 bar. The units are 100% oil-free and generally hold ISO 8573-1 Class 0 certification, serving industries such as electronics, pharmaceuticals, petrochemicals and textiles that require high air purity.

• The table above shows the compatibility range; individual fitment must be confirmed by machine nameplate and serial number.
• Large Centac machines typically use multiple elements in the inlet system; the number per machine varies by model, so 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

The inlet and lubrication systems of a Centac centrifugal machine include seven components commonly 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's Centac parts manual.

Component	Location	Function	Inspection point
Intake air filter core	Inlet filter housing	Separate part number with a similar name (67765362 in this manual)	Check the number on the old 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 inlet volume and angle for capacity control	Check the linkage for binding or looseness; vane fouling affects control accuracy
Intake silencer	In the inlet duct	Reduces inlet 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; critical to centrifugal efficiency	Check air-side fouling; on water-cooled machines also check water-side scaling
Aftercooler	After the final stage	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: the maintenance value of a centrifugal machine lies in sustaining efficiency. At each inlet element change, 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 annual planned maintenance, not deferred until efficiency visibly drops.