Product
Ingersoll Rand 47557738001 Standard Air Filter | RS45i/55i/75i
Standard intake air filter element 47557738001 for Ingersoll Rand RS45i, RS55i and RS75i screw compressors, with a 4,000-hour change interval under standard conditions. Not for IE/NE-suffix units or high-dust configurations (use 24900318). Order by part number with full verification support.
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1. Product Overview
47557738001 is the standard intake air filter element used on the Ingersoll Rand RS45i, RS55i and RS75i screw compressors. In the parts manual it is listed under the English name ELEMENT, AIR FILTER (STANDARD).
It sits downstream of the unit's air inlet and upstream of the main intake valve. Ambient air passes through it before entering the compression chamber. If dust particles reach the airend directly, they wear the rotor and housing clearance; once that clearance opens up, output efficiency drops, and the loss is irreversible. The air filter element is what holds that line.
The same three models are built with two intake-side configurations: standard and high-dust. This part is the standard version, part number 47557738001; the high-dust configuration uses a different part number, 24900318. The two look similar. Fitting the wrong one will not trigger an immediate fault, but on a dusty site the standard element will clog early and its service interval will shorten noticeably. Check the site conditions first, then confirm the part number.
One more pitfall worth flagging: this part number does not apply to units whose model designation carries an IE or NE suffix. RS45i, RS45ie and RS45ne are different configurations, and their intake components are not interchangeable.
2. Basic Specifications
| Item | Detail |
|---|---|
| Part number | 47557738001 |
| English name | ELEMENT, AIR FILTER (STANDARD) |
| Description | Standard air filter element (standard intake filter) |
| Brand | Ingersoll Rand |
| Part type | Intake filtration consumable, complete replacement |
| Applicable models | RS45i, RS55i, RS75i |
| Not applicable to | Units with IE / NE model suffix; high-dust configuration units (use 24900318 for that configuration) |
| Installation position | Between the air inlet and the main intake valve |
| Change interval | 4,000 hours under standard conditions; earlier in dusty environments based on differential pressure |
3. Technical Specifications
3.1 Filtration Performance (Core Metrics)
| Parameter | Value / Notes |
|---|---|
| Filtration rating | Approx. 3–10 μm, primarily capturing particles above 10 μm |
| Filtration efficiency | ≥99% (standard test dust, rated airflow) |
| Filter class | Intake pre-filtration grade, characterized by efficiency and dust holding capacity; HVAC classification systems (G4 / F7 etc.) do not apply |
| Dust holding capacity | Typically 200–400 g for comparable elements; exact value per incoming inspection or manufacturer data |
| Cleanable / reusable | Not recommended. Paper media fibers collapse after washing, reducing both dust holding capacity and efficiency |
These figures are useful for judging whether the element needs changing and whether the correct grade was purchased; they are not suitable as acceptance criteria. For acceptance, use differential pressure.
3.2 Flow and Resistance Parameters
| Parameter | Value / Notes |
|---|---|
| Rated air flow | Varies by model; covers the intake volume corresponding to the discharge capacity of RS45i / RS55i / RS75i |
| Initial pressure drop | Approx. 0.2–0.5 kPa (2–5 mbar) |
| Operating differential range | Rises continuously between new installation and change point; no fixed value |
| Alarm / final resistance | Commonly set at 1.0–1.5 kPa (10–15 mbar); refer to the unit panel setting |
| Pressure drop vs. energy | Each 1 kPa increase in intake resistance raises shaft power by roughly 0.3%–0.5% at equal discharge volume |
An air filter element should not be changed only once it is fully blocked — it should be changed when it reaches a certain point. As differential pressure climbs from 0.3 kPa to 1.2 kPa the machine still runs, but you are already overpaying for electricity. At an estimated 0.4%/kPa, the extra power a 75 kW unit consumes over the second half of an element's life often exceeds the price of the element itself.
3.3 Dimensions and Installation Parameters
| Parameter | Value / Notes |
|---|---|
| External dimensions | Depend on the intake housing design and are not listed on this page; measure the old part |
| Effective filtration area | Typically in the 1.5–4 m² range for comparable elements |
| Pleat count / pleat pitch | Depends on media and area design; count on the actual part |
| Mounting interface | Fits into the seat bore of the intake housing and locates via the end-face seal; no threads, no clamps |
| Sealing method | Soft sealing ring on the end cap, formed by housing compression |
| Installation orientation | Directional; sealing face toward the seat bore, must not be installed reversed |
Before ordering, the simplest approach is to remove the old element and measure three dimensions: outer diameter, overall height and seal-face inner diameter. If these three match, you are unlikely to go wrong.
3.4 Material Construction
| Component | Material | Notes |
|---|---|---|
| Filter media | Wood-pulp fiber filter paper (resin-impregnated for reinforcement) | Standard intake-grade construction |
| Media basis weight | Typically 120–160 g/m² for comparable elements | Basis weight affects burst strength and dust holding space |
| Inner / outer support | Galvanized steel wire mesh or perforated plate | Prevents collapse under negative pressure and maintains pleat shape |
| End caps | Metal end caps with soft sealing ring, or polyurethane foam end caps | Also serve as the sealing carrier |
| Sealing element | Nitrile rubber (NBR) or polyurethane | Ensures no bypass at the seat bore |
| Bonding layer | Hot-melt adhesive or polyurethane adhesive | Fixes end caps to the media |
3.5 Operating Condition Tolerance
| Parameter | Value / Notes |
|---|---|
| Operating temperature | Normal intake conditions, approx. −20 °C to +80 °C |
| Relative humidity | Handles high-humidity intake air; not suitable for intake carrying sustained liquid water droplets |
| Burst strength / collapse resistance | Must withstand intake negative pressure after clogging without collapsing; exact value per manufacturer drawings |
| Special features | None. The standard version has no oil-resistant, water-resistant or flame-retardant treatment |
3.6 Service Life and Maintenance Parameters
| Parameter | Value / Notes |
|---|---|
| Recommended change interval | 4,000 hours (standard conditions) |
| Interval in dusty environments | Noticeably shorter; judge by differential pressure, not by rigid hour counts |
| Intermediate inspection | Check element surface and differential pressure every 2,000 hours or quarterly |
| Shelf life | Store unopened, dry and away from light; use within 3 years recommended; moisture reduces media strength |
For continuously running units, follow the hour count; for sites running intermittently or on a quarterly maintenance schedule, follow the calendar interval — whichever comes first. Some domestic channels quote around 2,000 hours; that figure is conservative and can be treated as an early-change margin for dusty environments.
3.7 Standards
| Item | Notes |
|---|---|
| Manufacturer standard | Ingersoll Rand genuine parts standard |
| Filtration performance testing | References an air-cleaner test framework such as ISO 5011; no specific test report is attached to this part number |
| Environmental / material compliance | Per documentation supplied with the goods |
The ISO 2941 / 2942 / 2943 series commonly cited in aftermarket documentation are hydraulic filter standards, and ISO 16889 multi-pass testing applies to liquid filtration; none apply to intake air filters and should not be used as performance evidence when purchasing.
4. Standard Maintenance and Installation Steps
Step 1: Stop the machine, isolate power, release pressure Press the stop button, disconnect the main power supply and attach a lockout tag, then wait for internal pressure to fully release. Intake-side pressure is low, but residual pressure remains on the airend side and airflow can turn the rotor during disassembly. Wait until the pressure gauge reads zero before starting work.
Step 2: Record the differential pressure before changing Before removal, read the current intake resistance from the panel or differential pressure gauge and note it down. This figure is the only basis for judging whether the element was changed early or late, and it is gone once the element is out. Also record the hour meter reading.
Step 3: Open the intake housing and remove the old element Release the housing cover or clamping mechanism and take out the old element. Keep the element level during removal so surface dust does not fall into the intake chamber. Wipe the housing interior and seat bore with a clean cloth — dust on the seat bore will prevent the new element from sealing properly.
Step 4: Inspect the seat bore and sealing face Check three points: whether the seat bore is deformed, whether old seal residue remains on the sealing face, and whether the cover clamping mechanism is intact. Leftover O-ring material on the sealing face is the most common cause of leakage; the new element appears seated, but is actually pressing on a ring of old rubber.
Step 5: Verify the new part Place the new element alongside the old one and compare outer diameter, overall height and seal-face position. Then confirm the part number on the housing is 47557738001. If the site is a high-dust configuration, this step will reveal the mismatch — high-dust units require 24900318.
Step 6: Install the new element Sealing face toward the seat bore, insert vertically, do not angle it in. Once seated, press the outer ring by hand to confirm contact, then fit the cover. Tighten evenly — do not tighten bolts on one side only, or uneven load on the sealing face will leave a gap.
Step 7: Restore and test run Restore power, start the unit and run it unloaded for a few minutes. Listen for abnormal noise at the intake (a leak produces a whistling sound) and check whether the panel differential pressure returns to new-element level (approx. 0.2–0.5 kPa). If differential pressure is high, check installation first rather than assuming a problem with the element.
Step 8: Log the change Record the hour meter reading, change date, old and new differential pressures, and part number in the maintenance log. Next time you assess the interval, this line will be more accurate than any manual.
5. Frequently Asked Questions
Q1: What is the difference between 47557738001 and 24900318?
The first is the standard intake filter element; the second is the high-dust intake filter element. Both fit the same position and look similar, but the media and dust holding capacity differ. The standard part is for normal intake environments; the high-dust part is for sites with noticeably high dust levels. Fitting the wrong one will not cause an immediate fault, but the service interval will be clearly off.
Q2: My machine is an RS45ie — can I use this?
No. This part number corresponds only to RS45i, RS55i and RS75i. Units with an IE or NE suffix use different intake component part numbers. Before buying, read the full model designation on the nameplate, not just the leading numbers.
Q3: How many hours between changes?
4,000 hours under standard conditions. On dusty sites, do not apply the hour count rigidly — watch differential pressure: change at 1.0–1.5 kPa (per panel setting). Some domestic channels quote 2,000 hours; that figure is conservative and can be treated as an early-change margin for dusty environments.
Q4: Can the element be blown out and reused?
Not recommended. Blowing compressed air from the inside out loosens the media fibers and distorts pleat spacing, reducing dust holding capacity — and the change is not visible. It looks like saving one element in the short term, but in practice it sends dust into the airend.
Q5: Can it be washed with water?
No. Wood-pulp fiber filter paper loses fiber bonding when wet, and both strength and efficiency decline after drying.
Q6: Differential pressure is high right after installation — is the element at fault?
Check the installation first. Old O-ring residue on the sealing face, uneven cover clamping, or an element not fully seated will all raise differential pressure. Rule out these three before suspecting the element itself.
Q7: How do I tell whether the air filter or the oil filter is clogged?
Watch two readings: if intake negative pressure (or air filter differential pressure) rises while discharge temperature changes little, it is most likely the air filter; a clogged oil filter is usually accompanied by oil pressure changes and rising discharge temperature. Reading both together is more reliable than either alone.
Q8: What else should be changed together with the air filter?
Under the maintenance kit structure, the 4,000-hour tier also replaces oil filter element 24900433; at 8,000 hours, add oil separator element 23708423, return-air filter 88089743 and two valve service packs. Changing the air filter alone is of course acceptable — just do not let the other components' intervals slip.
Q9: Why do prices for the same model of air filter vary so much?
The difference comes mainly from media and workmanship: filter paper basis weight, pleat count, support frame strength and end-cap sealing method. Cheaper parts typically cut corners in these less visible areas, showing up as higher initial pressure drop, lower dust holding capacity and easier collapse in damp conditions. For continuously running units, that price difference is usually offset by electricity costs and downtime.
Q10: Can an element be used after long storage?
Use within 3 years recommended, stored unopened, dry and away from light. Media that has absorbed moisture may look normal but has already lost strength, and can collapse under negative pressure after installation, blocking the intake.
6. Compatible Models
| Model | Compatibility | Notes |
|---|---|---|
| RS45i | Compatible | Part number listed in both parts manual and price list |
| RS55i | Compatible | As above |
| RS75i | Compatible | As above |
| RS45ie / RS55ie / RS75ie | Not compatible | Different model suffix; different intake component part number |
| RS45ne / RS55ne / RS75ne | Not compatible | As above |
| Other RS series (RS30, RS90 and above) | Not compatible | Different frame; intake components are not interchangeable |
| High-dust configuration RS45i / RS55i / RS75i | Not compatible | That configuration requires 24900318 |
Verification method: read the full model designation on the unit nameplate (including suffix), then compare the part number against the intake section of parts manual 47612270. Only when both match is this the correct part.
7. Related Parts
The following are parts from the same RS45i / RS55i / RS75i family, related to the intake side or the same maintenance interval:
| Part number | Name | Relationship |
|---|---|---|
| 24900318 | High-dust air filter element | Upgraded part for the same position. Sites with high dust should switch to this number |
| 24900433 | Oil filter element (FILTER, COOLANT) | Same 4,000-hour maintenance tier; changed together with the air filter |
| 23708423 | Oil separator element | Added at the 8,000-hour tier |
| 88089743 | Return-air filter (.25 INCH BSPT) | Added at the 8,000-hour tier |
| 24242398 | Dryer filter (DRYER FILTER) | Only for units equipped with a refrigerated dryer |
| 47784006001 | 4,000 h standard maintenance kit | Includes 1 × this element + 1 × oil filter element |
| 47784007001 | 4,000 h maintenance kit with dryer | Includes this element + oil filter element + dryer filter |
| 47784008001 | 8,000 h standard maintenance kit | Includes this element + oil filter + oil separator + return-air filter + two valve service packs |
Maintenance kits are tiered by unit configuration; before ordering, refer to the maintenance kit list in the parts manual supplied with the unit. Units with and without a refrigerated dryer use different 4,000-hour kit numbers — do not mix them.