Product
Ingersoll Rand 47557738001 Standard Air Filter | RS45i/RS55i/RS75i
Standard inlet air filter element 47557738001 for Ingersoll Rand RS45i, RS55i and RS75i 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 inlet air filter element used on Ingersoll Rand RS45i, RS55i and RS75i screw compressors. In the parts manual it is listed as ELEMENT, AIR FILTER (STANDARD).
It sits downstream of the inlet opening and upstream of the main inlet valve. Ambient air passes through it before entering the compression chamber. If dust particles reach the airend directly, they wear the rotor and casing clearances; once the clearance opens up, delivery efficiency drops — and the loss is irreversible. The air filter element guards this critical point.
For these same three models, the inlet side has two configurations: standard and high-dust. This part is the standard type, part number 47557738001; the high-dust configuration uses part number 24900318. The two look similar and installing the wrong one will not trigger an immediate fault, but in dusty sites the standard element will clog prematurely and the replacement interval will be noticeably shorter. Check the site conditions first, then confirm the part number.
Another common pitfall: this part number does not apply to units with an IE or NE suffix. RS45i, RS45ie and RS45ne are different configurations, and their inlet parts are not interchangeable.
2. Basic Parameters
| Item | Details |
|---|---|
| Part number | 47557738001 |
| English name | ELEMENT, AIR FILTER (STANDARD) |
| Chinese name | Standard air filter element (standard inlet filter) |
| Brand | Ingersoll Rand |
| Part type | Inlet filtration consumable, complete replacement |
| Applicable models | RS45i, RS55i, RS75i |
| Not applicable | Units with IE / NE suffix; high-dust configuration units (use 24900318 for that configuration) |
| Installation position | Between inlet opening and main 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 / Description |
|---|---|
| Filtration rating | Approx. 3–10 μm, primarily capturing particles above 10 μm |
| Filtration efficiency | ≥99% (with standard test dust at rated airflow) |
| Filter class | Inlet pre-filtration grade, characterized by efficiency and dust holding capacity; HVAC classification (G4 / F7 etc.) does not apply |
| Dust holding capacity | Typically 200–400 g for comparable parts; exact value per incoming inspection or manufacturer data |
| Cleanable / reusable | Not recommended. After water washing, paper media fibers collapse and both dust holding capacity and efficiency drop |
These figures help judge whether to replace and whether the grade is correct; they are not acceptance criteria. For acceptance, use differential pressure.
3.2 Flow and Resistance Parameters
| Parameter | Value / Description |
|---|---|
| Rated air flow | Varies by model; covers inlet flow corresponding to the discharge capacities of RS45i / RS55i / RS75i |
| Initial pressure drop | Approx. 0.2–0.5 kPa (2–5 mbar) |
| Operating differential pressure range | Rises continuously from new to replacement point; no fixed value |
| Alarm / final resistance | Typically set at 1.0–1.5 kPa (10–15 mbar); refer to unit panel settings |
| Pressure drop vs. energy consumption | For every 1 kPa increase in inlet resistance, shaft power increases by approx. 0.3%–0.5% at constant discharge flow |
Air filters should not be replaced only when completely clogged; they should be replaced when they reach a certain point. As differential pressure rises from 0.3 kPa to 1.2 kPa, the machine still runs, but electricity is being wasted. At an estimated 0.4%/kPa, the extra power consumed by a 75 kW unit during the second half of the filter's life often exceeds the price of the filter itself.
3.3 Dimensions and Installation Parameters
| Parameter | Value / Description |
|---|---|
| Dimensions | Depend on inlet housing design; not marked on this page; measure the old part |
| Effective filtration area | Typically 1.5–4 m² for comparable parts |
| Pleat count / pitch | Depends on media and area design; verify by counting on the actual part |
| Mounting interface | Fits into inlet housing seat, located by face seal; not threaded, not clamped |
| Sealing method | Soft gasket on end cap, compressed by housing force |
| Installation orientation | Oriented; sealing face toward seat, do not install backwards |
Before ordering, remove the old element and measure three dimensions: outer diameter, overall height, and seal face inner diameter. Matching these three numbers ensures correct fit.
3.4 Material Construction
| Component | Material | Description |
|---|---|---|
| Filter media | Wood pulp fiber filter paper (resin impregnated for reinforcement) | Standard inlet grade |
| Media basis weight | Typically 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, maintains pleat shape |
| End caps | Metal end caps with soft gasket, or polyurethane foam end caps | Also serve as sealing carrier |
| Seal | Nitrile rubber (NBR) or polyurethane | Ensures no bypass at seat |
| Adhesive | Hot melt or polyurethane adhesive | Bonds end caps to media |
3.5 Operating Condition Tolerance
| Parameter | Value / Description |
|---|---|
| Operating temperature | Normal inlet conditions, approx. −20 °C to +80 °C |
| Relative humidity | Handles high-humidity inlet air; not suitable for continuous liquid water droplets |
| Burst strength / collapse pressure | Must withstand inlet negative pressure after clogging without collapsing; specific value per manufacturer drawing |
| Special features | None. Standard type without oil-proof, water-proof, or flame-retardant treatment |
3.6 Life and Maintenance Parameters
| Parameter | Value / Description |
|---|---|
| Recommended replacement interval | 4000 hours (standard conditions) |
| Interval in dusty environments | Significantly shorter; judge by differential pressure, not by hours alone |
| Intermediate inspection | Inspect filter surface and differential pressure every 2000 hours or quarterly |
| Shelf life | Store unopened in dry, dark conditions; use within 3 years. Moisture reduces media strength |
For continuous operation, follow the hour interval; for intermittent operation or quarterly maintenance sites, follow the calendar interval, whichever comes first. Some domestic channels state approx. 2000 hours; this is conservative and can be used as an early replacement trigger in dusty environments.
3.7 Standards
| Item | Description |
|---|---|
| Manufacturer standard | Ingersoll Rand genuine parts standard |
| Filtration performance testing | Referenced to air filter test frameworks such as ISO 5011; no specific test report is attached to this part number |
| Environmental / material compliance | Refer to documentation supplied with the goods |
The ISO 2941 / 2942 / 2943 series commonly cited for replacement parts are hydraulic filter standards, and ISO 16889 multi-pass method is for liquid filtration; neither applies to inlet air filters and should not be used as performance criteria for procurement.
4. Standard Maintenance and Installation Steps
Step 1: Stop, disconnect power, relieve pressure Press the stop button, disconnect the main power and lock out/tag out, and wait for internal pressure to fully relieve. Inlet pressure is low, but residual pressure on the airend side can cause the rotor to turn during disassembly. Wait until the pressure gauge reads zero before proceeding.
Step 2: Record differential pressure before replacement Before removal, read the current inlet resistance from the panel or differential pressure gauge and record it. This value is the only basis for judging whether replacement is early or late; once removed, it is gone. Also record the hour meter reading.
Step 3: Open inlet housing, remove old element Loosen the housing cover or clamping mechanism and remove the old element. Keep the element level during removal to prevent surface dust from falling into the inlet chamber. Wipe the housing interior and seat with a clean cloth; dust on the seat can prevent proper sealing of the new element.
Step 4: Inspect seat and sealing face Check three points: seat deformation, old gasket residue on sealing face, and condition of cover clamping mechanism. Residual gasket on the sealing face is the most common cause of air leaks; the new element may appear seated but is actually pressing on a ring of old rubber.
Step 5: Verify new part Compare new element with old side by side: outer diameter, overall height, seal face position. Also check that the part number on the housing is 47557738001. If the site has high-dust configuration, this step will reveal the issue — high-dust models require 24900318.
Step 6: Install new element With sealing face toward the seat, insert vertically; do not tilt. After seating, press the outer ring by hand to confirm contact, then install the cover. Tighten evenly; do not tighten bolts on one side only, as uneven force can leave gaps in the sealing face.
Step 7: Restore and test run Restore power, start the unit, and run unloaded for a few minutes. Listen for abnormal noise at the inlet (leaks may cause a whistling sound) and check whether panel differential pressure drops to new-element level (approx. 0.2–0.5 kPa). If pressure is high, first check installation; do not immediately suspect the filter.
Step 8: Record Write the hour meter reading, replacement date, old and new differential pressures, and part number in the maintenance log. For future interval decisions, this line is more accurate than any manual.
5. FAQ
Q1: What is the difference between 47557738001 and 24900318?
The former is the standard inlet air filter; the latter is the high-dust inlet air filter. Both fit the same position and look similar, but the media and dust holding capacity differ. The standard part is for normal inlet environments; the high-dust part is for sites with noticeably high dust. Installing the wrong one will not cause immediate failure, but the service interval will be significantly off.
Q2: My machine is RS45ie. Can I use this?
No. This part number corresponds only to RS45i, RS55i, and RS75i. Units with IE or NE suffix use different inlet part numbers. Read the full model on the nameplate before purchasing; do not rely only on the leading numbers.
Q3: How often should it be replaced?
Every 4000 hours under standard conditions. In dusty sites, do not rely on hours alone; check differential pressure: replace at 1.0–1.5 kPa (per panel setting). Some domestic channels state 2000 hours; this is conservative and can be used as an early replacement trigger in dusty environments.
Q4: Can I blow it out and reuse it?
Not recommended. Blowing compressed air from inside out will loosen media fibers and deform pleat spacing, reducing dust holding capacity, and the damage is not visible. It may seem to save a part in the short term, but actually sends dust into the airend.
Q5: Can it be washed with water?
No. Wood pulp fiber filter paper loses fiber bonding when wet, and after drying both strength and efficiency degrade.
Q6: The differential pressure is high right after installation. Is the filter at fault?
Check installation first. Residual old gasket on the sealing face, uneven cover tightening, or incomplete seating can all cause high differential pressure. After ruling out these three, then suspect the filter itself.
Q7: How can I tell if the air filter or oil filter is clogged?
Look at two values: if inlet negative pressure (or air filter differential pressure) rises while discharge temperature changes little, it is likely the air filter; a clogged oil filter is usually accompanied by oil pressure changes and rising discharge temperature. Reading both together is more accurate than one alone.
Q8: What else should be replaced along with the air filter?
According to the maintenance kit structure, at the 4000-hour interval also replace the oil filter 24900433; at 8000 hours also add the oil separator 23708423, return air filter 88089743, and two valve service kits. Replacing the air filter alone is fine, but do not delay the intervals of other parts.
Q9: Why is there a big price difference for the same model air filter?
The difference mainly comes from media and workmanship: paper basis weight, pleat count, support strength, end cap sealing method. Cheaper parts often cut corners in these invisible areas, resulting in higher initial pressure drop, lower dust holding capacity, and easy collapse when damp. For continuously running units, this price difference is usually offset by electricity costs and downtime.
Q10: Can it be used after long storage?
Under unopened, dry, dark conditions, use within 3 years. Media that has absorbed moisture may look normal but has reduced strength and can collapse under negative pressure after installation, blocking inlet air.
6. Compatible Models
| Model | Compatibility | Notes |
|---|---|---|
| RS45i | Compatible | Listed in parts manual and price list |
| RS55i | Compatible | Same as above |
| RS75i | Compatible | Same as above |
| RS45ie / RS55ie / RS75ie | Not compatible | Different model suffix; different inlet part number |
| RS45ne / RS55ne / RS75ne | Not compatible | Same as above |
| Other RS series (RS30, RS90 and above) | Not compatible | Different frame; inlet parts not interchangeable |
| High-dust configuration RS45i / RS55i / RS75i | Not compatible | Use 24900318 for that configuration |
Verification method: read the full model (including suffix) on the unit nameplate, then compare the part number in the inlet section of parts manual 47612270. Both must match for this part to be correct.
7. Related Parts
The following parts are from the same RS45i / RS55i / RS75i family and are related to the inlet side or the same maintenance interval:
| Part number | Name | Relationship |
|---|---|---|
| 24900318 | High-dust air filter element | Upgrade for same position. Use for high-dust sites |
| 24900433 | Oil filter (FILTER, COOLANT) | Same 4000-hour maintenance interval; replace together with air filter |
| 23708423 | Oil separator element | Added at 8000-hour interval |
| 88089743 | Return air filter (.25 INCH BSPT) | Added at 8000-hour interval |
| 24242398 | Dryer filter (DRYER FILTER) | Only for units with refrigerated dryer configuration |
| 47784006001 | 4000h standard maintenance kit | Includes 1 × this part + 1 × oil filter |
| 47784007001 | 4000h maintenance kit with dryer | Includes this part + oil filter + dryer filter |
| 47784008001 | 8000h standard maintenance kit | Includes this part + oil filter + oil separator + return air filter + two valve service kits |
Maintenance kits are tiered by unit configuration; refer to the maintenance kit list in the unit's parts manual before ordering. Units with and without refrigerated dryers have different 4000-hour kit numbers; do not mix them.