Product
Ingersoll Rand 47557738001 Standard Air Filter | RS45i/55i/75i
Ingersoll Rand 47557738001 standard air intake filter element for RS45i, RS55i and RS75i rotary screw compressors. 4000-hour service interval under standard conditions; not for IE/NE suffix units or high-dust configurations (use 24900318). Verify by part number before ordering.
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1. Product Overview
47557738001 is the standard intake air filter element used on the Ingersoll Rand RS45i, RS55i and RS75i rotary screw compressors. The English designation in the parts manual is ELEMENT, AIR FILTER (STANDARD).
It sits downstream of the intake opening and upstream of the compressor inlet valve. Ambient air passes through it before entering the compression chamber. If dust particles reach the airend directly, they wear the rotor-to-housing clearance; once that clearance opens up, volumetric efficiency drops, and the loss is irreversible. The air filter element is what holds that line.
These same three models carry 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, and fitting the wrong one will not trigger an immediate fault — but in dusty sites 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 common pitfall: 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 parts are not interchangeable.
2. Basic Specifications
| Item | Detail |
|---|---|
| Part number | 47557738001 |
| English designation | ELEMENT, AIR FILTER (STANDARD) |
| Chinese designation | 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 (that configuration uses 24900318) |
| Installed position | Between the intake opening and the compressor inlet valve |
| Replacement interval | 4000 hours under standard conditions; earlier in dusty environments based on differential pressure |
3. Technical Specifications
3.1 Filtration Performance (Core Metrics)
| Parameter | Value / Note |
|---|---|
| Filtration rating | Approx. 3–10 μm, primarily capturing particles above 10 μm |
| Filtration efficiency | ≥99% (standard test dust, at rated air flow) |
| Filter class | Intake pre-filtration grade, characterized by efficiency and dust holding capacity; HVAC ventilation classes (G4 / F7 etc.) do not apply |
| Dust holding capacity | Commonly 200–400 g for comparable parts; exact value per incoming inspection or manufacturer data |
| Washable / reusable | Not recommended. Paper media fibres collapse after water washing, reducing both dust holding capacity and efficiency |
These figures help you judge whether to replace the element and whether you have bought the wrong grade — they are not suitable as acceptance criteria. For acceptance, look at differential pressure.
3.2 Flow and Resistance Parameters
| Parameter | Value / Note |
|---|---|
| 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 from new installation to the replacement point; no fixed value |
| Alarm / final resistance | Commonly set at 1.0–1.5 kPa (10–15 mbar), per the unit panel setting |
| Pressure drop vs. energy consumption | Each 1 kPa increase in intake resistance raises shaft power by approx. 0.3%–0.5% at equal discharge volume |
An air filter element should not be replaced only once it is fully blocked — it should be replaced 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 consumed by a 75 kW unit during the second half of the element's life often exceeds the price of the element itself.
3.3 Dimensions and Installation Parameters
| Parameter | Value / Note |
|---|---|
| Overall dimensions | Depend on the intake housing design; not listed on this page — measure the old part |
| Effective filtration area | Typically in the 1.5–4 m² range for comparable parts |
| Pleat count / pleat spacing | Depend on media and area design; count on the actual part |
| Mounting interface | Fits into the intake housing seat, located by the end-face seal; not threaded, not clamped |
| Sealing method | Soft seal ring on the end cap, formed by housing clamping force |
| Installation orientation | Oriented — sealing face toward the seat; do not install 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 almost certainly on the right part.
3.4 Material Construction
| Component | Material | Note |
|---|---|---|
| Filter media | Wood-pulp fibre filter paper (resin-impregnated for reinforcement) | Standard intake grade |
| Media basis weight | Commonly 120–160 g/m² for comparable parts | 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 cap with soft seal ring, or polyurethane foam end cap | Also serves as the sealing carrier |
| Seal | Nitrile rubber (NBR) or polyurethane | Ensures no bypass between element and seat |
| Bonding layer | Hot-melt adhesive or polyurethane adhesive | Fixes end caps to media |
3.5 Operating Condition Tolerance
| Parameter | Value / Note |
|---|---|
| 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 / collapse resistance | Must withstand intake negative pressure after the element clogs without collapsing; specific value per manufacturer drawing |
| Special functions | None. The standard version has no oil-repellent, water-repellent or flame-retardant treatment |
3.6 Service Life and Maintenance Parameters
| Parameter | Value / Note |
|---|---|
| Recommended replacement interval | 4000 hours (standard conditions) |
| Interval in dusty environments | Significantly shorter; judge by differential pressure, not by a fixed hour count |
| Interim inspection | Recommended every 2000 hours or quarterly — check element surface and differential pressure |
| Shelf life | Unopened, stored dry and away from light; use within 3 years recommended. Media strength decreases after moisture exposure |
For continuously running units, follow the hour count; for intermittent operation or sites on a quarterly maintenance schedule, follow the calendar interval — whichever comes first. Some domestic channels quote about 2000 hours; that figure is on the conservative side and can be treated as an early-replacement margin for dusty environments.
3.7 Standards
| Item | Note |
|---|---|
| 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 filter literature are hydraulic filter standards, and ISO 16889 multi-pass testing covers liquid filtration — none of these 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, then disconnect the main power supply and attach a lockout tag. Wait for internal pressure to fully release. Intake-side pressure is low, but residual pressure remains on the airend side, and the rotor can be driven by airflow during disassembly. Wait until the pressure gauge reads zero before starting work.
Step 2: Record the differential pressure before replacement Before removing anything, 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 replaced early or late, and it disappears 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 with a clean cloth — dust on the seat will prevent the new element from sealing properly.
Step 4: Inspect the seat and sealing face Check three things: whether the seat is deformed, whether old seal ring residue remains on the sealing face, and whether the cover clamping mechanism is intact. Residual rubber on the sealing face is the most common cause of leakage — the new element appears to seat correctly but is actually pressing on a ring of old rubber.
Step 5: Verify the new part Place the new element next to 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 runs a high-dust configuration, this step will reveal it — high-dust models require 24900318.
Step 6: Install the new element With the sealing face toward the seat, lower it in vertically — do not insert at an angle. Once seated, press the outer ring by hand to confirm contact, then fit the cover. Apply clamping force evenly; do not tighten bolts on one side only, or the sealing face will be unevenly loaded and leave a gap.
Step 7: Restore and test run Restore power, start the unit and run unloaded for a few minutes. Listen for abnormal noise at the intake (leakage produces a whistling sound) and check whether panel differential pressure has dropped to new-element level (approx. 0.2–0.5 kPa). If differential pressure is high, check installation first — do not jump to blaming the element.
Step 8: Record Write the hour meter reading, replacement date, old and new differential pressures and part number into the maintenance log. Next time you assess the interval, this line is more accurate than any manual.
5. Frequently Asked Questions
Q1: What is the difference between 47557738001 and 24900318?
The former is the standard intake filter element, the latter the high-dust intake filter element. Both fit in 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 a different intake part number. Before buying, read the complete model designation on the nameplate — do not look only at the leading numbers.
Q3: How many hours between replacements?
4000 hours under standard conditions. On dusty sites, do not force the hour count — watch differential pressure: replace when it reaches 1.0–1.5 kPa (per panel setting). Some domestic channels quote 2000 hours; that figure is on the conservative side and can be treated as an early-replacement margin for dusty environments.
Q4: Can I blow the element out with compressed air and reuse it?
Not recommended. Blowing compressed air from the inside out loosens the media fibres and distorts pleat spacing, reducing dust holding capacity — and the damage is invisible. It may look like you saved an element in the short term, but in practice you are sending dust into the airend.
Q5: Can it be washed with water?
No. Wood-pulp fibre filter paper loses fibre bonding strength when wet, and both strength and efficiency decline after drying.
Q6: Differential pressure is high right after installation — is it the element?
Check the installation first. Residual old rubber 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?
Read two values: 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 replaced together with the air filter?
Per the service kit structure, the 4000-hour tier also replaces oil filter element 24900433; at 8000 hours, add the oil separator element 23708423, return-air filter 88089743 and two valve service kits. Replacing the air filter alone is of course possible — just do not push the other parts' intervals back.
Q9: Why do prices for the same model of air filter vary so much?
The price gap mainly comes from media and workmanship: paper basis weight, pleat count, support strength and end-cap sealing method. Cheaper parts typically cut corners in these invisible areas, showing up as higher initial pressure drop, lower dust holding capacity and easier collapse under moisture. For continuously running units, that price difference is usually offset by electricity cost and downtime.
Q10: Can it still be used after long storage?
Unopened, stored dry and away from light, use within 3 years is recommended. Media that has absorbed moisture may look normal, but its strength has already declined and it can collapse under negative pressure after installation, blocking the intake.
6. Compatible Models
| Model | Compatible | Note |
|---|---|---|
| RS45i | Yes | Part number listed in both parts manual and price list |
| RS55i | Yes | As above |
| RS75i | Yes | As above |
| RS45ie / RS55ie / RS75ie | No | Different model suffix; different intake part number |
| RS45ne / RS55ne / RS75ne | No | As above |
| Other RS series (RS30, RS90 and above) | No | Different frame; intake parts are not interchangeable |
| RS45i / RS55i / RS75i in high-dust configuration | No | That configuration requires 24900318 |
Verification method: read the complete 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 service interval:
| Part number | Name | Relationship |
|---|---|---|
| 24900318 | High-dust air filter element | Upgrade at the same position. Sites with high dust should switch to this number |
| 24900433 | Oil filter element (FILTER, COOLANT) | Same 4000-hour service tier; replaced together with the air filter |
| 23708423 | Oil separator element | Added at the 8000-hour tier |
| 88089743 | Return-air filter (.25 INCH BSPT) | Added at the 8000-hour tier |
| 24242398 | Dryer filter (DRYER FILTER) | Used only on units with a refrigerated dryer configuration |
| 47784006001 | 4000h standard service kit | Contains 1 × this part + 1 × oil filter element |
| 47784007001 | 4000h service kit with dryer | Contains this part + oil filter element + dryer filter |
| 47784008001 | 8000h standard service kit | Contains this part + oil filter + oil separator + return-air filter + two valve service kits |
Service kits are tiered by unit configuration; before ordering, refer to the service kit list in the parts manual supplied with the unit. Units with and without a refrigerated dryer use different 4000-hour kit numbers — do not mix them.