Product
Ingersoll Rand 47557738001 Standard Air Filter | RS45i/55i/75i
Standard inlet air filter element for Ingersoll Rand RS45i, RS55i and RS75i screw compressors. Replace at 4,000 hours under standard conditions. Not for IE/NE suffix units or high-dust configurations (use 24900318). Verify by part number before ordering.
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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 name in the parts manual is ELEMENT, AIR FILTER (STANDARD).
It is located after the machine inlet and before the main intake valve. Outside air passes through it first, then enters the compression chamber. If dust particles enter the main unit directly, they wear the rotor and housing clearance. Once the clearance increases, pumping efficiency drops — and this is irreversible. The air filter element guards this critical point.
For these same 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. Installing the wrong one will not trigger an immediate fault, but in dusty sites the standard element will clog prematurely and the replacement interval will be noticeably shorter. Check 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, RS45ie and RS45ne are different configurations, and inlet 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 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 units (use 24900318 for that configuration) |
| Installation Location | Between air inlet and main intake valve |
| Replacement Interval | 4,000 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% (with standard test dust at rated airflow) |
| Filter Class | Inlet pre-filtration grade, characterized by efficiency and dust holding capacity; HVAC classification (G4 / F7 etc.) does not apply |
| 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 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, check pressure drop.
3.2 Flow and Resistance Parameters
| Parameter | Value / Description |
|---|---|
| Rated Airflow | Varies by model; covers inlet airflow for RS45i / RS55i / RS75i displacement ranges |
| 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); refer to machine panel setting |
| Pressure Drop vs. Energy | Each 1 kPa increase in inlet resistance raises shaft power by approx. 0.3%–0.5% at equal discharge volume |
Replace the air filter not only when clogged, but when it reaches a certain point. As 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 power consumed by a 75 kW unit during the second half of the filter's life often exceeds the price of the filter itself.
3.3 Dimensions and Installation Parameters
| Parameter | Value / Description |
|---|---|
| Dimensions | Depend on inlet housing design; not marked on this page; measure 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 inlet housing seat, located by end-face seal; not threaded, not clamped |
| Seal Type | Soft sealing ring on end cap, formed by housing compression |
| Installation Orientation | Has front and back; sealing face toward seat; do not install reversed |
Before ordering, remove the old part 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 inlet 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 seal, or polyurethane foam end caps | Also serve 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 inlet conditions, approx. −20 °C to +80 °C |
| Relative Humidity | Can handle high-humidity inlet air; not suitable for continuous liquid water droplets |
| Burst / Collapse Pressure | Must withstand inlet negative pressure after clogging without collapse; specific value per manufacturer drawing |
| Special Functions | None. Standard type without oil-proof, water-proof, or flame-retardant treatment |
3.6 Life and Maintenance Parameters
| Parameter | Value / Description |
|---|---|
| Recommended Replacement Interval | 4,000 hours (standard conditions) |
| Interval in Dusty Environments | Significantly shorter; judge by pressure drop, not fixed hours |
| Intermediate Inspection | Recommended every 2,000 hours or quarterly: check filter surface and pressure drop |
| Shelf Life | Unopened, store dry and away from light; use within 3 years. Moisture reduces media strength |
For continuous operation, use hours as the primary basis; for intermittent operation or quarterly maintenance sites, use calendar intervals, whichever comes first. Some domestic channels state approx. 2,000 hours; this figure is conservative and can be used as an early margin 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; no specific test report attached to this part number |
| Environmental / Material Compliance | Per documentation supplied with goods |
Replacement part documentation often cites ISO 2941 / 2942 / 2943 series, which are hydraulic filter standards, and ISO 16889 multi-pass method for liquid filtration. None apply to inlet 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. Inlet 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 drop before replacement Before removal, read current inlet resistance from panel or gauge and record. This number is the only basis for judging early or late replacement; once removed, it is lost. Also record hour meter reading.
Step 3: Open inlet housing, remove old element Loosen cover or clamping mechanism, remove old element. Keep element level during removal 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 seal residue on sealing face, and condition of cover clamping mechanism. Residual rubber ring on sealing face is the most common cause of leakage; 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 machine, run unloaded for a few minutes. Listen for abnormal noise at inlet (leaks may whistle), check panel pressure drop returns to new element level (approx. 0.2–0.5 kPa). If pressure drop is high, first check installation, do not immediately suspect the element.
Step 8: Record Write hour meter reading, replacement date, old and new pressure drop, 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 filter element, the latter is the high-dust inlet filter element. Both fit the same location and look similar, but media and dust holding capacity differ. Standard part is for normal inlet environments; high-dust part is for sites with noticeably high dust. Installing the wrong one 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 often should it be replaced?
Every 4,000 hours under standard conditions. In dusty sites, do not rely on hours; check pressure drop: replace at 1.0–1.5 kPa (per panel setting). Some domestic channels state 2,000 hours; this is conservative and can be used as an early margin in dusty environments.
Q4: Can I blow it out with compressed air and reuse?
Not recommended. Blowing compressed air from inside out loosens media fibers and deforms pleat spacing, reducing dust holding capacity — often invisibly. 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 degrade.
Q6: Pressure drop is high right after installation. Is it the filter?
Check installation first. Residual old rubber ring on sealing face, uneven cover clamping, or element not fully seated can all cause high pressure drop. After ruling these out, suspect the element itself.
Q7: How to tell if the air filter or oil filter is clogged?
Check two readings: if inlet 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. Read both together for better accuracy.
Q8: What else should be replaced along with the air filter?
Per maintenance kit structure, at 4,000 hours also replace oil filter 24900433; at 8,000 hours also add oil separator 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?
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 easier collapse when damp. For continuously running machines, this price difference is usually offset by electricity costs and downtime.
Q10: Can it be used after long storage?
Use within 3 years if unopened, stored dry and away from light. Moisture-affected media may look normal but strength is reduced, and it may collapse under negative pressure and block intake after installation.
6. Compatible Models
| Model | Compatibility | Notes |
|---|---|---|
| RS45i | Compatible | Part number 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 inlet part number |
| RS45ne / RS55ne / RS75ne | Not compatible | Same as above |
| Other RS series (RS30, RS90 and above) | Not compatible | Different frame; inlet parts not interchangeable |
| High-dust configuration RS45i / RS55i / RS75i | Not compatible | Use 24900318 for that configuration |
Verification method: read full model on machine nameplate (including suffix), then compare part number in inlet section of parts manual 47612270. Both must match for this part.
7. Related Parts
The following are parts in the same family for RS45i / RS55i / RS75i, related to the inlet side or the same maintenance interval:
| Part Number | Name | Relationship |
|---|---|---|
| 24900318 | High-dust air filter element | Upgrade at same location. Use this number for dusty sites |
| 24900433 | Oil filter element (FILTER, COOLANT) | Same 4,000-hour maintenance interval; replace with air filter |
| 23708423 | Oil separator element | Added at 8,000-hour interval |
| 88089743 | Return air filter (.25 INCH BSPT) | Added at 8,000-hour interval |
| 24242398 | Dryer filter (DRYER FILTER) | Only for units with refrigerated dryer configuration |
| 47784006001 | 4,000h standard maintenance kit | Includes 1 × this part + 1 × oil filter |
| 47784007001 | 4,000h maintenance kit with dryer | Includes this part + oil filter + dryer filter |
| 47784008001 | 8,000h standard maintenance kit | Includes this part + oil filter + oil separator + return air filter + two valve service kits |
Maintenance kits are tiered by machine configuration; before ordering, refer to the maintenance kit list in the machine parts manual. 4,000-hour kit numbers differ between units with and without refrigerated dryers; do not mix.