Product
Ingersoll Rand 47557738001 Standard Air Filter | RS45i/RS55i/RS75i
Ingersoll Rand 47557738001 standard air intake filter for RS45i, RS55i, and RS75i screw compressors. Recommended replacement at 4000 hours under standard conditions. Not for IE/NE suffix models or high-dust configurations (use 24900318).
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1. Product Overview
47557738001 is the standard air intake filter element used on Ingersoll Rand RS45i, RS55i, and RS75i screw compressors. In the parts manual, the English name is ELEMENT, AIR FILTER (STANDARD).
It is located downstream of the compressor intake and upstream of the main air inlet valve. Ambient air passes through it before entering the compression chamber. If dust particles enter the main unit directly, they wear the rotor and casing clearance. As clearance increases, compression efficiency drops irreversibly. The air filter element serves as this critical barrier.
For these same three models, two intake configurations exist: 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. Installing the wrong one will not trigger an immediate fault, but in high-dust environments, the standard element will clog prematurely, significantly shortening the replacement interval. Always check the site conditions before selecting the part number.
Another common pitfall: this part number does not apply to units with IE or NE suffixes. RS45i, RS45ie, and RS45ne are different configurations, and intake parts are not interchangeable.
2. Basic Specifications
| 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 | Models with IE / NE suffix; high-dust configuration units (use 24900318) |
| Installation Position | Between intake and main air 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% (under standard test dust and rated airflow) |
| Filter Class | Intake pre-filtration grade, characterized by efficiency and dust holding capacity; not classified by HVAC standards (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 determine whether replacement is due and whether the correct grade was purchased; they are not intended as acceptance criteria. For acceptance, rely on pressure differential.
3.2 Flow and Resistance Parameters
| Parameter | Value / Description |
|---|---|
| Rated Airflow | Varies by model, covering intake air volumes corresponding to RS45i / RS55i / RS75i displacements |
| Initial Pressure Drop | Approx. 0.2–0.5 kPa (2–5 mbar) |
| Operating Pressure Differential Range | Continuously rises from new to replacement point; no fixed value |
| Alarm / Final Resistance | Typical setting 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 constant discharge |
Air filters should not be replaced only when clogged; they should be replaced when they reach a certain point. As pressure differential rises from 0.3 kPa to 1.2 kPa, the machine still runs, but electricity costs increase. At an estimated 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 purchase price.
3.3 Dimensions and Installation Parameters
| Parameter | Value / Description |
|---|---|
| Dimensions | Depends on intake housing design; not listed on this page; verify by measuring old part |
| Effective Filtration Area | Typically 1.5–4 m² for similar parts |
| Pleat Count / Pitch | Depends on media and area design; verify by counting on actual part |
| Mounting Interface | Fits into intake housing seat, positioned by end-face seal; not threaded, not clamped |
| Sealing Method | Soft gasket on end cap, compressed by housing clamping force |
| Installation Orientation | Directional; 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 intake grade |
| Media Basis Weight | Typically 120–160 g/m² for similar 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 |
| Sealing Element | 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 | Can handle high-humidity intake; not suitable for continuous liquid water droplets |
| Burst Strength / Collapse Pressure | Must withstand intake negative pressure 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) |
| 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, stored dry and away from light, use within 3 years; media strength decreases if damp |
For continuous operation, base interval on hours; for intermittent operation or quarterly maintenance sites, use calendar interval, whichever comes first. Some domestic channels state approx. 2000 hours; this is conservative and can be used as an early replacement margin in dusty environments.
3.7 Standards
| Item | Description |
|---|---|
| Manufacturer Standard | Ingersoll Rand genuine parts 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 documentation supplied with goods |
Note: ISO 2941 / 2942 / 2943 series commonly cited for replacement parts 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, disconnect power, depressurize Press stop button, disconnect main power and lock out/tag out, wait for internal pressure to fully release. Intake pressure is low, but residual pressure on the main unit side may cause rotor movement 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 value is the only basis for judging early or late replacement and will be lost after removal. Also record hour meter reading.
Step 3: Open intake housing, remove old element Loosen housing cover or clamping mechanism, remove old element. Keep element level during removal to prevent surface dust from falling into intake chamber. Wipe housing interior and seat with clean cloth; dust on seat can prevent proper sealing of new element.
Step 4: Inspect seat and sealing surface Check three points: seat deformation, old gasket residue on sealing surface, and condition of cover clamping mechanism. Residual old gasket is the most common cause of leakage; new element may seem seated but is actually resting on old rubber.
Step 5: Verify new part Compare new element with old side by side: outer diameter, overall height, seal face position. Check housing label for part number 47557738001. If site is high-dust configuration, this step will reveal the discrepancy — 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 one bolt only, as uneven force may leave gaps in sealing surface.
Step 7: Restore and test run Restore power, start unit, run unloaded for a few minutes. Listen for abnormal noise at intake (whistling indicates leakage), check panel pressure differential returns to new part level (approx. 0.2–0.5 kPa). If differential is high, first check installation, do not immediately suspect the element.
Step 8: Record Enter hour meter reading, replacement date, old and new pressure differentials, and part number in maintenance log. For future interval decisions, this record is more accurate than any manual.
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. Both fit the same position and look similar, but media and dust holding capacity differ. Standard part is for normal intake environments; high-dust part is for sites with significantly elevated dust. Installing the wrong one will not cause immediate failure, but the replacement interval will be noticeably off.
Q2: My machine is RS45ie. Can I use this?
No. This part number corresponds only to RS45i, RS55i, RS75i. Units with IE or NE suffix use different intake part numbers. Read the full model on the nameplate before purchasing, not just the leading numbers.
Q3: How often should it be replaced?
Every 4000 hours under standard conditions. In dusty sites, do not rely on hours; monitor 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 replacement margin in dusty environments.
Q4: Can I blow it out and reuse?
Not recommended. Blowing compressed air from inside out loosens media fibers and distorts pleat spacing, reducing dust holding capacity, often invisibly. Short-term savings may send dust into the main unit.
Q5: Can it be washed with water?
No. Wood pulp fiber filter paper loses fiber bonding when wet, and strength and efficiency degrade after drying.
Q6: Pressure differential is high right after installation. Is the filter at fault?
Check installation first. Residual old gasket on sealing surface, uneven cover clamping, or element not fully seated can cause high differential. After ruling out these three, then suspect the element itself.
Q7: How to tell if the air filter or oil filter is clogged?
Check two values: if intake negative pressure (or air filter differential) rises while discharge temperature remains stable, it is likely the air filter. A clogged oil filter usually accompanies 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?
Per maintenance kit structure, at 4000 hours also replace oil filter 24900433; at 8000 hours also add oil separator 23708423, return air filter 88089743, and two valve service kits. Replacing the air filter alone is acceptable, but do not delay other items beyond their intervals.
Q9: Why is there a big price difference for the same model air filter?
Price differences mainly come from media and construction: paper basis 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 tendency to collapse when damp. For continuously running units, the price difference is usually offset by energy and downtime costs.
Q10: Can it be used after long storage?
Under unopened, dry, and dark conditions, use within 3 years. Damp media may look normal but strength has decreased; installation may lead to collapse under negative pressure and blocked intake.
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 intake part number |
| RS45ne / RS55ne / RS75ne | Not compatible | Same as above |
| Other RS series (RS30, RS90 and above) | Not compatible | Different frame, intake parts not interchangeable |
| High-dust configuration RS45i / RS55i / RS75i | Not compatible | Use 24900318 for this configuration |
Verification method: Check the full model on the unit nameplate (including suffix), then compare part number in the intake 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 the intake side or the same maintenance interval:
| Part Number | Name | Relationship |
|---|---|---|
| 24900318 | High-Dust Air Filter Element | Upgrade for same position. Use in high-dust 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 pc this part + 1 pc 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 purchasing, refer to the maintenance kit list in the unit parts manual. Units with and without refrigerated dryer have different 4000-hour kit numbers; do not mix.