Product
Ingersoll Rand 47557738001 Standard Air Filter | RS45i/55i/75i
Ingersoll Rand 47557738001 standard air filter element 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, its English name is ELEMENT, AIR FILTER (STANDARD).
It is located after the air intake 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 will wear the rotor and housing clearance. Once the clearance increases, compression efficiency drops irreversibly. The air filter element serves as this critical barrier.
For these same 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 a different part number, 24900318. The two look similar, and installing the wrong one will not cause 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 deciding on 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 their 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 | Models with IE / NE suffix; high-dust configuration (use 24900318) |
| Installation Position | Between air intake and main intake valve |
| Replacement Interval | 4000 hours under standard conditions; earlier in dusty environments based on pressure drop |
3. Technical Specifications
3.1 Filtration Performance (Core Indicators)
| Parameter | Value / Description |
|---|---|
| Filtration Rating | Approx. 3–10 μm, primarily captures particles above 10 μm |
| Filtration Efficiency | ≥99% (under standard test dust and rated airflow) |
| Filter Class | Intake pre-filter grade, characterized by efficiency and dust holding capacity; does not follow HVAC classification (G4 / F7, etc.) |
| Dust Holding Capacity | Typically 200–400 g for similar parts; exact value subject to 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 are useful for determining whether to replace and whether the grade is correct, but they are not acceptance criteria. For acceptance, rely on pressure drop.
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 | 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 unit panel settings |
| 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 completely clogged; they should be replaced when they reach a certain point. When pressure drop rises from 0.3 kPa to 1.2 kPa, the machine still runs, but you are paying extra electricity. At an estimated 0.4%/kPa, the extra energy consumed by a 75 kW unit during the latter half of the filter's life often exceeds the cost of the filter itself.
3.3 Dimensions and Installation Parameters
| Parameter | Value / Description |
|---|---|
| Dimensions | Depends on intake housing design; not specified on this page; measure the old part |
| Effective Filtration 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 intake housing seat, located by end-face seal; not threaded, not clamped |
| Sealing Method | Soft sealing ring on end cap, compressed by housing |
| Installation Orientation | Directional; sealing face toward seat, do not install backwards |
Before ordering, the easiest way is to remove the old element and measure three points: outer diameter, overall height, and seal face inner diameter. Matching these three ensures correct fit.
3.4 Material Composition
| Component | Material | Description |
|---|---|---|
| Filter Media | Wood pulp fiber filter paper (resin impregnated for reinforcement) | Standard intake grade configuration |
| 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 negative pressure, maintains pleat shape |
| End Caps | Metal end caps with soft seal, 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 | Can handle high-humidity intake; not suitable for continuous liquid water droplets |
| Burst / Collapse Pressure | Must withstand intake negative pressure after clogging without collapse; specific value per manufacturer drawings |
| 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; determine by pressure drop, not fixed hours |
| Intermediate Inspection | Recommended every 2000 hours or quarterly: check filter surface and pressure drop |
| Shelf Life | Unopened, stored dry and away from light; use within 3 years; media strength decreases if damp |
For continuous operation, base replacement on hours; for intermittent operation or quarterly maintenance, use calendar intervals, whichever comes first. Some domestic channels state about 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 Test | References air filter test framework such as ISO 5011; specific test report not included with this part number |
| Environmental / Material Compliance | Refer to documents supplied with shipment |
Replacement part documentation often cites ISO 2941 / 2942 / 2943 series, which are hydraulic filter standards, and ISO 16889 multi-pass method for liquid filtration; these do not apply to intake air filters and should not be used as performance basis.
4. Standard Maintenance and Installation Steps
Step 1: Stop, disconnect power, relieve pressure Press the stop button, disconnect main power and lock out, wait for internal pressure to fully relieve. Intake pressure is low, but residual pressure on the main unit side may cause rotor movement during disassembly. Wait until the pressure gauge reads zero.
Step 2: Record pressure drop before replacement Before removal, read the current intake resistance from the panel or pressure gauge and note it. This value is the only basis for judging early or late replacement; it is lost after removal. Also record the hour meter reading.
Step 3: Open intake 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 intake chamber. Wipe the housing interior and seat with a clean cloth; dust on the seat can cause poor sealing of the new element.
Step 4: Inspect seat and sealing surface Check three points: seat deformation, old seal residue on sealing surface, and condition of cover clamping mechanism. Residual O-ring on the sealing surface is the most common cause of air leakage; the new element may appear 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. Also verify 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 seat, insert vertically; do not tilt. After seating, press the outer ring by hand to confirm fit, then install cover. Tighten evenly; do not tighten only one side, as uneven pressure may leave gaps.
Step 7: Restore and test run Restore power, start unit, run unloaded for a few minutes. Listen for abnormal noise at intake (leaks may cause whistling), check panel pressure drop returns to new part level (approx. 0.2–0.5 kPa). If pressure drop is high, first check installation before suspecting the element.
Step 8: Record Enter hour meter reading, replacement date, old and new pressure drops, and part number in 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 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 is for normal intake environments; high-dust is for sites with significantly high dust. Installing the wrong one will not cause immediate failure, but the interval will be noticeably incorrect.
Q2: My machine is RS45ie. Can I use this?
No. This part number only corresponds to RS45i, RS55i, RS75i. Models with IE or NE suffix have 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 before replacement?
4000 hours under standard conditions. In dusty sites, do not stick to hours; monitor pressure drop: 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 trigger in dusty environments.
Q4: Can I blow it clean and reuse?
Not recommended. Blowing compressed air from inside out will loosen media fibers, deform pleat spacing, reduce dust holding capacity, and the damage is not visible. Short-term savings may actually send dust into the main unit.
Q5: Can it be washed with water?
No. Wood pulp fiber filter paper loses fiber bonding when wet; after drying, strength and efficiency both decrease.
Q6: Pressure drop is high right after installation. Is it the filter?
Check installation first. Residual old O-ring on sealing surface, uneven cover tightening, or element not fully seated can all cause high pressure drop. After ruling these out, suspect the element itself.
Q7: How to tell if air filter or oil filter is clogged?
Check two values: if intake negative pressure (or air filter pressure drop) rises while discharge temperature changes little, it is likely the air filter; a clogged oil filter usually comes with oil pressure changes and rising discharge temperature. Reading both is more accurate than one alone.
Q8: What else should be replaced with the air filter?
According to the maintenance kit structure, at 4000 hours also replace oil filter element 24900433; at 8000 hours also add oil separator element 23708423, return air filter 88089743, and two valve service kits. Replacing only the air filter is fine, but do not delay other parts beyond their intervals.
Q9: Why is there a big price difference for the same model air filter?
The 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 units, this price difference is usually offset by electricity 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 blockage of 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 the part number in the 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 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) | Part of 4000-hour maintenance, replace with air filter |
| 23708423 | Oil Separator Element | Added at 8000 hours |
| 88089743 | Return Air Filter (.25 INCH BSPT) | Added at 8000 hours |
| 24242398 | Dryer Filter | Only for units with refrigerated dryer |
| 47784006001 | 4000h Standard Maintenance Kit | Includes 1 air filter + 1 oil filter |
| 47784007001 | 4000h Maintenance Kit with Dryer | Includes air filter + oil filter + dryer filter |
| 47784008001 | 8000h Standard Maintenance Kit | Includes air filter + 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 dryers have different 4000-hour kit numbers; do not mix them.