Product
Ingersoll Rand 47557738001 Standard Air Filter | RS45i/RS55i/RS75i
Standard OEM air filter element for Ingersoll Rand RS45i/RS55i/RS75i rotary screw compressors. 4000-hour service interval under normal conditions. Not for IE/NE suffix units 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 rotary screw compressors. The English name in the parts manual 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 wear the rotor and housing clearances. Once the clearance increases, pumping efficiency drops irreversibly. The air filter element guards this critical point.
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 trigger an immediate fault, but in high-dust environments the standard element will clog prematurely and the replacement interval will be significantly shortened. 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 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 |
| Compatible Models | RS45i, RS55i, RS75i |
| Incompatible Models | Units with IE / NE suffix; high-dust configuration units (use 24900318) |
| Installation Location | Between air intake 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% (with standard test dust at rated airflow) |
| Filter Class | Intake pre-filtration grade, characterized by efficiency and dust holding capacity; not classified under ventilation/AC standards (G4 / F7 etc.) |
| Dust Holding Capacity | Typical 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 determine whether to replace and whether the correct grade was purchased; they are not acceptance criteria. For acceptance, check the 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 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); 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 volume |
Air filters should be replaced before they are completely clogged—when they reach a certain point. As pressure differential 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 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 marked on this page; refer to actual old part measurement |
| 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; no threads, no clamps |
| Sealing Method | Soft gasket on end cap, formed by housing compression |
| Installation Orientation | Directional; sealing face toward seat, do not install backwards |
Before ordering, the easiest approach is to 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 filter paper (resin-impregnated for reinforcement) | Standard intake grade configuration |
| Media Weight | Typically 120–160 g/m² for similar parts | 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 Conditions
| 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 drawings |
| Special Features | None. Standard type without oil-proof, water-proof, or flame-retardant treatments |
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 by hours alone |
| Intermediate Inspection | Recommended every 2000 hours or quarterly: check filter surface and pressure differential |
| Shelf Life | Unopened, stored dry and away from light; recommended use within 3 years; media strength decreases after moisture exposure |
For continuous operation, follow hours; for intermittent operation or quarterly maintenance sites, follow calendar intervals—whichever comes first. Some domestic channels state approx. 2000 hours; this figure 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; specific test reports not included with this part number |
| Environmental / Material Compliance | Refer to documentation supplied with goods |
Replacement part documentation often references ISO 2941 / 2942 / 2943 series, which are hydraulic filter standards, and ISO 16889 multi-pass method for liquid filtration—neither applies to intake air filters and should not be used as performance basis for procurement.
4. Standard Maintenance and Installation Steps
Step 1: Stop machine, disconnect power, relieve pressure Press stop button, disconnect main power and lock out/tag out, wait for internal pressure to bleed. Intake side pressure is low, but residual pressure on the main unit side can cause rotor movement during disassembly. Wait until pressure gauge reads zero before proceeding.
Step 2: Record pressure differential before replacement Before removal, read current intake resistance from panel or differential gauge and record. This value is the only basis for judging whether replacement is early or late; it is 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 a 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 seal residue on sealing surface, and condition of cover clamping mechanism. Residual rubber ring on sealing surface is the most common cause of air leaks; 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 check housing part number is 47557738001. If site is high-dust configuration, this step will reveal the issue—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, as uneven force can leave gaps in seal.
Step 7: Restore and test run Restore power, start unit, run unloaded for a few minutes. Listen for abnormal noise at intake (leaks cause whistling), check panel differential pressure returns to new element level (approx. 0.2–0.5 kPa). If differential remains high, first check installation, do not immediately suspect the element.
Step 8: Record Write hour meter reading, replacement date, old and new differential pressures, 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 element; the latter is the high-dust intake filter element. Both install in the same location and look similar, but media and dust holding capacity differ. Standard element is for normal intake environments; high-dust element is for sites with significantly elevated dust. Installing the wrong one will not cause immediate failure, but the service 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 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 solely 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 trigger in dusty environments.
Q4: Can I blow it out and reuse?
Not recommended. Blowing compressed air from inside out loosens media fibers and deforms pleat spacing, reducing dust holding capacity—and this is not visible. Short-term savings often result in dust entering the main unit.
Q5: Can it be washed with water?
No. Wood pulp fiber filter paper loses fiber bonding when wet; after drying, both strength and efficiency degrade.
Q6: The pressure differential is high right after installation. Is it the filter?
Check installation first. Residual old rubber on sealing surface, uneven cover tightening, or incomplete seating can all 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?
Look at two values: if intake negative pressure (or air filter differential) rises while discharge temperature remains relatively stable, it is likely the air filter; a clogged oil filter usually comes with 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 the maintenance kit structure, at the 4000-hour interval 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 the air filter alone is fine, but do not delay other items beyond their intervals.
Q9: Why is there such a price difference for the same model air filter?
Price differences mainly come 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 costs and downtime.
Q10: Can it be used after long storage?
Under unopened, dry, and dark conditions, use within 3 years is recommended. Media that has absorbed moisture may look normal but has reduced strength; it can collapse under negative pressure after installation and block 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 for this part to be correct.
7. Related Parts
The following are parts in the RS45i / RS55i / RS75i family related to the intake side or the same maintenance interval:
| Part Number | Name | Relationship |
|---|---|---|
| 24900318 | High-Dust Air Filter Element | Upgrade for same location. Use for 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 | Only for units with refrigerated dryer |
| 47784006001 | 4000h Standard Maintenance Kit | Includes 1x this part + 1x oil filter element |
| 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 parts manual supplied with the unit for kit contents before ordering. Units with and without refrigerated dryers have different 4000-hour kit numbers; do not mix.