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. 4000-hour service interval in 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. The English designation in the parts manual is ELEMENT, AIR FILTER (STANDARD).
It sits downstream of the compressor intake and upstream of the inlet valve on the airend. 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, delivery efficiency drops — irreversibly. The air filter element is the part that guards this boundary.
The same three models use two intake-side configurations: standard and high-dust. This item 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 the replacement 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 parts are not interchangeable.
2. Basic Specifications
| Item | Details |
|---|---|
| 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 (use 24900318 for those) |
| Installation position | Between the intake and the airend inlet valve |
| Replacement interval | 4000 hours in standard conditions; shorten per differential pressure in dusty environments |
3. Technical Specifications
3.1 Filtration Performance (Core Indicators)
| Parameter | Value / Notes |
|---|---|
| Filtration rating | Approx. 3–10 μm, primarily capturing particles above 10 μm |
| Filtration efficiency | ≥99% (standard test dust, at 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 | Commonly 200–400 g for comparable parts; exact value per incoming inspection or manufacturer data |
| Washable / reusable | Not recommended. Paper media fibers collapse after water 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 acceptance criteria. For acceptance, look at differential pressure.
3.2 Flow and Resistance Parameters
| Parameter | Value / Notes |
|---|---|
| Rated air handling capacity | Varies by model; covers the intake volume corresponding to the three discharge ratings 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 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 |
Air filter elements should not be run until fully clogged — they should be replaced once they reach a certain point. As differential pressure climbs from 0.3 kPa to 1.2 kPa the machine still runs, but you are already paying extra electricity. At roughly 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 |
|---|---|
| Overall dimensions | Depend on intake housing design; not stated on this page — measure the old part |
| Effective filtration area | Typically on the order of 1.5–4 m² for comparable parts |
| Pleat count / pleat spacing | Depends on media and area design; count on the actual part |
| Mounting interface | Seats into the intake housing bore, located by face seal; not threaded, not clamped |
| Sealing method | Soft gasket on the end cap, formed by clamping force from the housing |
| Installation orientation | Oriented — sealing face toward the bore; 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 those three match, you will almost certainly have the right part.
3.4 Material Construction
| Component | Material | Notes |
|---|---|---|
| Filter media | Wood-pulp cellulose filter paper (resin-impregnated for reinforcement) | Standard intake grade configuration |
| Media basis weight | Commonly 120–160 g/m² for comparable parts | Basis weight affects burst strength and dust holding space |
| Inner and 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 gasket, or polyurethane foam end cap | Also serves as the sealing carrier |
| Seal | Nitrile rubber (NBR) or polyurethane | Ensures no bypass between element and bore |
| Adhesive layer | Hot-melt adhesive or polyurethane adhesive | Bonds end caps to 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; not suitable for intake carrying sustained liquid water droplets |
| Burst strength / collapse resistance | Must withstand intake negative pressure after clogging without collapsing; specific values 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 / Notes |
|---|---|
| Recommended replacement interval | 4000 hours (standard conditions) |
| Interval in dusty environments | Significantly shorter; judge by differential pressure rather than applying a fixed hour count |
| Intermediate inspection | Recommended every 2000 hours or quarterly — check element surface and differential pressure |
| Storage shelf life | Store unopened, dry and away from light; use within 3 years. Media strength degrades after moisture exposure |
For continuously running units, follow the hour count; for intermittent operation or calendar-based maintenance programs, follow the calendar interval — whichever comes first. Some domestic channels quote approximately 2000 hours; that figure is conservative and can be treated as an early-change margin for dusty environments.
3.7 Applicable Standards
| Item | Notes |
|---|---|
| Manufacturer standard | Ingersoll Rand genuine part standard |
| Filtration performance testing | References air cleaner test frameworks such as ISO 5011; no specific test report is supplied with this part number |
| Environmental / material compliance | Per documentation supplied with the goods |
Note that the ISO 2941 / 2942 / 2943 series commonly cited in aftermarket filter literature are hydraulic filter standards, and ISO 16889 multi-pass testing applies to liquid filtration — none of these apply to intake air filters and should not be used as performance evidence in procurement.
4. Standard Maintenance and Installation Steps
Step 1: Stop the machine, isolate power, release pressure After pressing the stop button, 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 on the airend side can turn the rotor during disassembly. Do not start work until the pressure gauge reads zero.
Step 2: Record the differential pressure before replacement Before removing anything, read the current intake resistance from the panel or differential pressure gauge and write it down. This figure is the only basis for judging whether the change is early or late — once the element is out, it is gone. 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 as you remove it so surface dust does not fall into the intake chamber. Wipe the housing interior and bore with a clean cloth — dust buildup on the bore will prevent the new element from sealing properly.
Step 4: Inspect the bore and sealing face Check three things: whether the bore is deformed, whether old gasket residue remains on the sealing face, and whether the cover clamping mechanism is intact. Old gasket residue on the sealing face is the most common cause of leakage — the new element appears fully seated but is actually resting on a ring of old rubber.
Step 5: Verify the new part Place the new element beside the old one and compare outer diameter, overall height and seal-face position. Then check that the part number on the housing label 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 With the sealing face toward the bore, 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 uneven loading on the sealing face will 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 the 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 rush to blame the element.
Step 8: Log the service Record the hour meter reading, replacement 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 former is the standard intake air filter element; the latter is the high-dust intake 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 elevated dust levels. Fitting the wrong one will not cause an immediate fault, but the service interval will clearly be wrong.
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 model suffix use a different intake part number. Before ordering, read the complete model designation on the nameplate — do not look only at the leading numbers.
Q3: How many hours between replacements?
4000 hours in standard conditions. In dusty sites, do not apply a fixed hour count — go by differential pressure: replace at 1.0–1.5 kPa (per panel setting). Some domestic channels quote 2000 hours; that figure is conservative and can be treated as an early-change margin for dusty environments.
Q4: Can the element be blown out with compressed air 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 invisible. It may look like you saved one element short term, but in practice you sent the dust into the airend.
Q5: Can it be washed with water?
No. Wood-pulp cellulose filter paper loses fiber bonding on contact with water, and both strength and efficiency degrade after drying.
Q6: Differential pressure is high right after installation — is it the element?
Check the installation first. Old gasket residue on the sealing face, uneven cover clamping, or an element not fully seated will all cause high 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 stays roughly unchanged, it is most likely the air filter; a clogged oil filter is usually accompanied by oil pressure change and rising discharge temperature. Reading both together is more reliable than reading one alone.
Q8: What else should be replaced together with the air filter?
Under the service kit structure, the 4000-hour tier also replaces oil filter element 24900433; at 8000 hours, add oil separator element 23708423, return-air filter 88089743 and two valve service packs. Replacing the air filter alone is of course fine — just do not let the other parts' intervals slip.
Q9: Why is there such a large price spread between air filters for the same model?
The spread comes mainly from media and workmanship: paper basis weight, pleat count, support frame strength and end-cap sealing method. Cheaper parts typically cut corners in these unseen 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 an element that has been in storage a long time still be used?
Under unopened, dry, light-protected storage, use within 3 years is recommended. Moisture-exposed media may look normal, but strength has already dropped, and it can collapse under negative pressure and block the intake after installation.
6. Compatible Models
| Model | Compatible | Notes |
|---|---|---|
| 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 |
| High-dust configuration RS45i / RS55i / RS75i | 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. Both must match for this to be the correct part.
7. Related Parts
The following parts belong to the same RS45i / RS55i / RS75i family and relate to the intake side or the same service interval:
| Part number | Description | Relationship |
|---|---|---|
| 24900318 | High-dust air filter element | Upgrade part for 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 element + 1 × oil filter element |
| 47784007001 | 4000h service kit with dryer | Contains this element + oil filter element + dryer filter |
| 47784008001 | 8000h standard service kit | Contains this element + oil filter + oil separator + return-air filter + two valve service packs |
Service kits are tiered by unit configuration; before ordering, confirm against 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.