Product
Ingersoll Rand 47557738001 Standard Air Filter | RS45i/55i/75i
Ingersoll Rand 47557738001 standard air filter element for 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 intake air filter element used on Ingersoll Rand RS45i, RS55i, and RS75i screw compressors. The English name in the parts manual is ELEMENT, AIR FILTER (STANDARD).
It is located after the machine air inlet and before the main intake 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 irreversibly. The air filter element is the barrier that prevents this.
For these three models, there are two intake 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; installing the wrong one will not cause an immediate fault, but in dusty sites the standard element will clog prematurely and the replacement interval will be significantly shortened. Check the site conditions before deciding 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 intake 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 Intake Filter) |
| Brand | Ingersoll Rand |
| Part Type | Intake filtration consumable, complete replacement |
| Applicable Models | RS45i, RS55i, RS75i |
| Not Applicable | Units with IE / NE suffix; high-dust configuration units (use 24900318) |
| Installation Position | Between air inlet and main intake 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 captures particles above 10 μm |
| Filtration Efficiency | ≥99% (standard test dust, rated airflow) |
| Filter Class | Intake pre-filter grade, characterized by efficiency and dust holding capacity; not comparable to HVAC classification (G4 / F7 etc.) |
| Dust Holding Capacity | Common range for similar parts: 200–400 g; 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 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 intake air volume corresponding to RS45i / RS55i / RS75i displacement |
| Initial Pressure Drop | Approx. 0.2–0.5 kPa (2–5 mbar) |
| Operating Pressure Differential Range | Rises continuously from new to replacement point; no fixed value |
| Alarm / Final Resistance | Typical setting 1.0–1.5 kPa (10–15 mbar); refer to machine panel setting |
| Pressure Drop vs. Energy Consumption | Each 1 kPa increase in intake resistance raises shaft power by approx. 0.3%–0.5% at constant discharge |
The air filter should be replaced when it reaches a certain pressure drop, not only when clogged. From 0.3 kPa to 1.2 kPa, the machine still runs, but electricity is being wasted. At 0.4%/kPa, the extra energy consumed by a 75 kW unit during 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 | Dependent on intake box design; not specified here; measure the old part |
| Effective Filtration Area | Typically 1.5–4 m² for similar parts |
| Pleat Count / Pitch | Dependent on media and area design; verify by counting on the actual part |
| Mounting Interface | Fits into intake box seat, located by end-face seal; not threaded, not clamped |
| Sealing Method | Soft gasket on end cap, compressed by housing |
| Installation Orientation | Directional; sealing face toward seat, do not install backwards |
Before ordering, measure three dimensions from the old part: 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 intake 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 adhesive | Bonds end caps to media |
3.5 Operating Condition Tolerance
| Parameter | Value / Description |
|---|---|
| Operating Temperature | Normal intake conditions, approx. −20 °C to +80 °C |
| Relative Humidity | Withstands high-humidity intake; not suitable for continuous liquid water droplets |
| Burst / Collapse Pressure | Must withstand intake vacuum 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 pressure differential, not fixed hours |
| Intermediate Inspection | Recommended every 2000 hours or quarterly: check filter surface and pressure differential |
| Shelf Life | Unopened, dry, protected from light; use within 3 years; moisture reduces media strength |
For continuous operation, use hours; for intermittent operation or quarterly maintenance, use calendar interval; 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 for this part number |
| Environmental / Material Compliance | Per shipping documentation |
ISO 2941 / 2942 / 2943 series commonly found in replacement part documentation are hydraulic filter standards; ISO 16889 multi-pass method is for liquid filtration; neither applies to intake air filters and should not be used as performance basis.
4. Standard Maintenance and Installation Steps
Step 1: Stop machine, disconnect power, relieve pressure Press stop button, disconnect main power and lock out. Wait for internal pressure to fully relieve. Intake side pressure is low, but main unit side retains pressure; rotor may be moved by airflow during disassembly. Wait until pressure gauge reads zero.
Step 2: Record pressure differential before replacement Before removal, read and record current intake resistance from panel or differential gauge. This is the only basis for judging early or late replacement; it is lost after removal. Also record hour meter reading.
Step 3: Open intake box, remove old filter Loosen cover or clamping mechanism, remove old filter. Keep filter level during removal to prevent surface dust from falling into intake chamber. Wipe inner walls and seat with clean cloth; dust on seat can cause poor sealing of new filter.
Step 4: Inspect seat and sealing surface Check three points: seat deformation, old gasket residue on sealing surface, and cover clamping mechanism integrity. Residual gasket is the most common cause of leakage; new filter may seem seated but is actually pressed on old rubber.
Step 5: Verify new part Compare new filter with old side by side: outer diameter, overall height, seal face position. Check part number on box is 47557738001. If site is high-dust configuration, this step will reveal it—high-dust machines require 24900318.
Step 6: Install new filter Sealing face toward seat, insert vertically, do not tilt. After seating, press outer ring to confirm contact, then install cover. Tighten evenly; do not tighten one side only, or sealing face may gap.
Step 7: Restore and test run Restore power, start machine, run unloaded for a few minutes. Listen for abnormal noise at intake (whistling indicates leak), check panel pressure differential returns to new part level (approx. 0.2–0.5 kPa). If high, first check installation, not filter.
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 intake filter, the latter is the high-dust intake filter. They fit the same position and look similar, but media and dust holding capacity differ. Standard is for normal intake; high-dust is for sites with significantly high dust. Installing wrong will not cause immediate fault, but interval will be incorrect.
Q2: My machine is RS45ie. Can I use this?
No. This part number only applies to RS45i, RS55i, RS75i. Units with IE or NE suffix use different intake part numbers. Read the full model on the nameplate before purchasing; do not rely only on the leading numbers.
Q3: How many hours between replacements?
4000 hours under standard conditions. In dusty sites, do not rely on hours; use 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 filter and reuse?
Not recommended. Compressed air from inside out will loosen media fibers, deform pleat pitch, reduce dust holding capacity, and damage is invisible. Short-term saving may send dust into 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 the filter faulty?
Check installation first. Residual old gasket on sealing surface, uneven cover tightening, or filter not fully seated can cause high differential. After ruling these out, suspect the filter.
Q7: How to tell if air filter or oil filter is clogged?
Check two values: if intake vacuum (or air filter differential) rises but discharge temperature changes little, likely air filter; oil filter clogging usually accompanies oil pressure change and discharge temperature rise. Reading both is more accurate than one.
Q8: What else should be replaced 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 items.
Q9: Why is there a big price difference for the same model air filter?
Price difference mainly comes from media and construction: paper weight, pleat count, frame 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 machines, this difference is usually offset by electricity and downtime costs.
Q10: Can it be used after long storage?
Unopened, dry, protected from light, use within 3 years. Moisture-exposed media may look normal but strength is reduced; it may collapse under vacuum and block intake after installation.
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 intake part number |
| RS45ne / RS55ne / RS75ne | No | Same as above |
| Other RS series (RS30, RS90 and above) | No | Different frame; intake parts not interchangeable |
| High-dust configuration RS45i / RS55i / RS75i | No | Use 24900318 for this configuration |
Verification method: read full model on nameplate (including suffix), then compare part number in intake section of parts manual 47612270. Both must match for this part.
7. Related Parts
The following are parts in the same family as RS45i / RS55i / RS75i, related to intake side or same maintenance interval:
| Part Number | Name | Relationship |
|---|---|---|
| 24900318 | High-Dust Air Filter Element | Upgrade at same position. Use for dusty sites |
| 24900433 | Oil Filter Element (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 Element (DRYER FILTER) | Only for units with refrigerated dryer configuration |
| 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 machine configuration; refer to the machine parts manual kit list before ordering. 4000-hour kit numbers differ for units with and without dryer; do not mix.