Product
Ingersoll Rand 47557738001 Standard Air Filter | RS45i/55i/75i
Standard inlet air filter element 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).
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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. The English part name in the parts manual is ELEMENT, AIR FILTER (STANDARD).
It is located after the compressor intake and before the main inlet valve. Outside air passes through it before entering the compression chamber. If dust particles enter the main unit directly, they wear the rotor and casing clearance. Once the clearance increases, pumping efficiency drops—and this is irreversible. The air filter element guards this critical point.
For these three models, there are two inlet configurations: standard and high-dust. This part is the standard type, part number 47557738001; the high-dust configuration uses a different part number, 24900318. The two look similar, and installing the wrong one will not trigger an immediate fault, but in high-dust sites the standard element will clog prematurely and the replacement interval will be noticeably shorter. Check the site conditions first, then decide the part number.
Another common pitfall: this part number does not apply to units with IE or NE suffixes. RS45i and RS45ie / RS45ne are different configurations, and the inlet part numbers are not interchangeable.
2. Basic Specifications
| 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 (use 24900318) |
| Installation Position | Between air intake and main inlet valve |
| Replacement Interval | 4000 hours under standard conditions; earlier in dusty environments based on pressure differential |
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% (standard test dust, rated airflow) |
| Filter Class | Inlet pre-filtration grade, characterized by efficiency and dust holding capacity; not based on HVAC classification (G4 / F7 etc.) |
| Dust Holding Capacity | Typically 200–400 g for similar parts; exact value per incoming inspection or manufacturer data |
| Cleanable / Reusable | Not recommended. Paper media fibers collapse after water washing, reducing both dust holding capacity and efficiency |
These figures help judge whether to replace and whether the grade is correct; they are not acceptance criteria. For acceptance, use pressure differential.
3.2 Flow and Resistance Parameters
| Parameter | Value / Description |
|---|---|
| Rated Airflow | Varies by model; covers inlet air volume for RS45i / RS55i / RS75i displacement |
| Initial Pressure Drop | Approx. 0.2–0.5 kPa (2–5 mbar) |
| Operating Pressure Differential | Rises continuously from new to replacement point; no fixed value |
| Alarm / Final Resistance | Common setting 1.0–1.5 kPa (10–15 mbar), per control panel setting |
| Pressure Drop vs. Energy | Each 1 kPa increase in inlet resistance raises shaft power by approx. 0.3%–0.5% at same discharge volume |
The air filter should be replaced at a certain point, not only when fully clogged. When pressure differential rises from 0.3 kPa to 1.2 kPa, the machine still runs, but electricity is being wasted. At 0.4%/kPa, the extra power consumed by a 75 kW unit in the second half of the filter's life often exceeds the filter's own price.
3.3 Dimensions and Installation Parameters
| Parameter | Value / Description |
|---|---|
| Overall Dimensions | Depends on inlet housing design; not marked on this page; measure old part |
| Effective Filter Area | Typically 1.5–4 m² for similar parts |
| Pleat Count / Pitch | Depends on media and area design; count on actual part |
| Mounting Interface | Fits into inlet housing seat, located by end-face seal; not threaded or clamped |
| Seal Type | Soft gasket on end cap, compressed by housing |
| 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 ensures correct fit.
3.4 Material Construction
| Component | Material | Description |
|---|---|---|
| Filter Media | Wood pulp fiber paper (resin impregnated) | Standard inlet grade |
| Media Weight | Typically 120–160 g/m² for similar parts | Affects burst strength and dust holding space |
| Inner/Outer Support | Galvanized steel wire mesh or perforated plate | Prevents collapse under vacuum, maintains pleat shape |
| End Caps | Metal end caps with soft gasket, or polyurethane foam end caps | Also serves as seal carrier |
| Seal | Nitrile rubber (NBR) or polyurethane | Ensures no bypass at seat |
| Adhesive | Hot melt or polyurethane glue | 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 intake; not suitable for continuous liquid water droplets |
| Burst / Collapse Pressure | Must withstand inlet vacuum after clogging without collapse; 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) |
| Dusty Environment Interval | Significantly shorter; judge by pressure differential, not fixed hours |
| Intermediate Inspection | Recommended every 2000 hours or quarterly: check element surface and pressure differential |
| Shelf Life | Unopened, dry and dark storage; use within 3 years; moisture reduces media strength |
For continuous operation, follow hours; for intermittent operation or quarterly maintenance, follow calendar intervals—whichever comes first. Some domestic channels state approx. 2000 hours; this is conservative and can be used as an early margin in dusty environments.
3.7 Standards
| Item | Description |
|---|---|
| Manufacturer Standard | Ingersoll Rand original part standard |
| Filtration Performance Test | Referenced to air filter test framework such as ISO 5011; specific test report not attached to this part number |
| Environmental / Material Compliance | Per documentation supplied with goods |
Replacement part documentation often lists ISO 2941 / 2942 / 2943 series, which are hydraulic filter standards, and ISO 16889 multi-pass method for liquid filtration—neither applies to inlet air filters and should not be used as performance basis.
4. Standard Maintenance and Installation Steps
Step 1: Stop, disconnect power, relieve pressure Press stop button, disconnect main power and lock out. Wait for internal pressure to fully release. Inlet pressure is low, but main unit side has residual pressure; rotor may be turned by airflow during disassembly. Wait until pressure gauge reads zero.
Step 2: Record pressure differential before replacement Before removal, read current inlet resistance from panel or differential gauge and record. This is the only basis for judging early or late replacement; once removed, it's gone. Also record hour meter reading.
Step 3: Open inlet housing, remove old element Loosen cover or clamping mechanism, remove old element. Keep element horizontal to prevent surface dust from falling into inlet chamber. Wipe housing interior and seat with clean cloth; dust on seat can cause poor seal with new element.
Step 4: Inspect seat and sealing face Check three points: seat deformation, old gasket residue on sealing face, and cover clamping mechanism integrity. Residual old rubber on sealing face is the most common cause of leakage; new element may seem seated but is actually pressing on old rubber.
Step 5: Verify new part Compare new element with old side by side: outer diameter, overall height, seal face position. Check part number on housing is 47557738001. If site is high-dust configuration, this step will reveal it—high-dust models require 24900318.
Step 6: Install new element Sealing face toward seat, insert vertically, do not tilt. After seating, press outer ring by hand to confirm contact, then install cover. Tighten evenly; do not tighten only one side, or sealing face may gap.
Step 7: Restore and test run Restore power, start unit, run unloaded for a few minutes. Listen for abnormal noise at intake (whistling indicates leak), check panel pressure differential returns to new element level (approx. 0.2–0.5 kPa). If high, check installation first; do not immediately blame the element.
Step 8: Record Write hour meter reading, replacement date, old/new pressure differential, and part number in maintenance log. This line is more accurate than any manual for future interval decisions.
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. They fit the same position and look similar, but media and dust holding capacity differ. Standard part for normal inlet environments; high-dust part for sites with noticeably high dust. Wrong installation will not cause immediate failure, but the interval will be noticeably off.
Q2: My machine is RS45ie. Can I use this?
No. This part number only corresponds to RS45i, RS55i, RS75i. Units with IE or NE suffix have different inlet part numbers. Read the full model on the nameplate before buying, not just the leading numbers.
Q3: How many hours between replacements?
4000 hours under standard conditions. In dusty sites, do not rely on hours; check pressure differential: 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 margin in dusty environments.
Q4: Can I blow clean the element and reuse it?
Not recommended. Compressed air from inside out will loosen media fibers and deform pleat spacing, reducing dust holding capacity—and it's not visible. Short-term savings may send dust into the main unit.
Q5: Can it be washed with water?
No. Wood pulp fiber paper loses fiber bonding when wet; after drying, strength and efficiency both degrade.
Q6: Pressure differential is high right after installation. Is it the element?
Check installation first. Residual old gasket on sealing face, uneven cover tightening, or element not fully seated can cause high differential. After ruling out these three, suspect the element itself.
Q7: How to tell if air filter or oil filter is clogged?
Check two values: if inlet vacuum (or air filter differential) rises while discharge temperature changes little, it's likely the air filter; oil filter clogging usually comes with oil pressure change and rising discharge temperature. Reading both is more accurate than one alone.
Q8: What else should be replaced together with the air filter?
Per maintenance kit structure, at 4000 hours also replace oil filter 24900433; at 8000 hours add oil separator 23708423, return air filter 88089743, and two valve service kits. Replacing air filter alone is fine, but do not delay other parts' intervals.
Q9: Why is there a big price difference for the same model air filter?
Price differences mainly come from media and construction: paper 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 and downtime.
Q10: Can it be used after long storage?
Unopened, dry and dark storage: use within 3 years. Moisture-affected media may look normal but strength is reduced; under vacuum it may collapse and block intake.
6. Compatible Models
| Model | Compatibility | Notes |
|---|---|---|
| RS45i | Yes | Listed in parts manual and price list |
| RS55i | Yes | Same as above |
| RS75i | Yes | Same as above |
| RS45ie / RS55ie / RS75ie | No | Different model suffix; different inlet part number |
| RS45ne / RS55ne / RS75ne | No | Same as above |
| Other RS series (RS30, RS90 and above) | No | Different frame; inlet parts not interchangeable |
| High-dust configuration RS45i / RS55i / RS75i | No | Use 24900318 for this configuration |
Verification method: Check full model on nameplate (including suffix), then compare part number in inlet section of parts manual 47612270. Both must match.
7. Related Parts
The following are parts in the same family for RS45i / RS55i / RS75i, related to inlet side or same maintenance interval:
| Part Number | Name | Relationship |
|---|---|---|
| 24900318 | High-Dust Air Filter Element | Upgrade for same position. Use this for high-dust sites |
| 24900433 | Oil Filter (FILTER, COOLANT) | Same 4000-hour maintenance interval; replace 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 |
| 47784006001 | 4000h Standard Maintenance Kit | Includes 1 x this part + 1 x 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. Before ordering, refer to the maintenance kit list in the unit's parts manual. Units with and without dryer have different 4000-hour kit numbers; do not mix.