Product
Ingersoll Rand 47557738001 Standard Air Filter | RS45i/55i/75i
Ingersoll Rand 47557738001 standard air filter element for RS45i, RS55i and RS75i rotary screw compressors. For standard inlet conditions, 4000-hour service interval. 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 rotary screw compressors. The English name in the parts manual is ELEMENT, AIR FILTER (STANDARD).
It is located after the compressor inlet and before the main inlet valve. Ambient air passes through it before entering the compression chamber. If dust particles enter the airend directly, they wear the rotor and housing clearances; once the clearance increases, volumetric efficiency drops, and the wear is irreversible. The air filter element is the barrier that prevents this.
For these 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 part number 24900318. The two look similar; installing the wrong one will not cause 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 first, then select the part number.
Another common pitfall: this part number does not apply to units with IE or NE suffix in the model code. RS45i, RS45ie and RS45ne are different configurations, and the 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) |
| Installation Position | Between inlet and main inlet 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% (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.) not applicable |
| 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 judging whether to replace and whether the correct grade was purchased; they are not suitable as acceptance criteria. For acceptance, check pressure drop.
3.2 Flow and Resistance Parameters
| Parameter | Value / Description |
|---|---|
| Rated Airflow | Varies by model; covers inlet airflow corresponding to the three displacement levels of RS45i / RS55i / RS75i |
| 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 | Commonly set at 1.0–1.5 kPa (10–15 mbar); refer to unit panel settings |
| Pressure Drop vs. Energy Consumption | Each 1 kPa increase in inlet resistance raises shaft power by approx. 0.3%–0.5% at the same discharge volume |
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 already paying more for 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 | Depends on inlet box design; not marked 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; verify by physical count |
| Mounting Interface | Fits into inlet box seat, positioned by end-face seal; not threaded, not clamped |
| Sealing Method | Soft gasket on end cap, formed by compression from housing |
| Installation Orientation | Front and back sides differentiated; 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 will essentially eliminate errors.
3.4 Material Composition
| Component | Material | Description |
|---|---|---|
| Filter Media | Wood pulp fiber filter paper (resin-impregnated reinforcement) | Standard inlet grade configuration |
| 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 serves as sealing carrier |
| Seal | Nitrile rubber (NBR) or polyurethane | Ensures no bypass between element and seat |
| Adhesive Layer | Hot melt adhesive 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 Strength / Collapse Pressure | Must withstand inlet negative pressure after clogging without collapse; specific value per manufacturer drawings |
| Special Functions | None. Standard type does not have 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 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; recommended use within 3 years; media strength decreases after moisture exposure |
For continuous operation, use hours as the primary guide; for intermittent operation or quarterly maintenance sites, follow calendar intervals—whichever comes first. Some domestic channels state approximately 2000 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 frameworks such as ISO 5011; specific test report not included with this part number |
| Environmental / Material Compliance | Subject to documentation supplied with goods |
ISO 2941 / 2942 / 2943 series commonly found in aftermarket literature are hydraulic filter standards; ISO 16889 multi-pass method is for liquid filtration—neither applies to inlet air filters and should not be used as performance basis for procurement.
4. Standard Maintenance and Installation Steps
Step 1: Stop, disconnect power, relieve pressure Press the stop button, disconnect main power and lock out/tag out. Wait for internal pressure to fully relieve. Inlet pressure is low, but residual pressure on the airend side may cause the rotor to be driven by airflow during disassembly. Wait until the pressure gauge reads zero before proceeding.
Step 2: Record pressure drop before replacement Before removal, read and record the current inlet resistance from the panel or differential pressure gauge. This number is the only basis for judging whether replacement is early or late; it is lost once removed. Also record the hour meter reading.
Step 3: Open inlet box, remove old element Loosen the cover or clamping mechanism and remove the old element. Keep the element horizontal during removal to prevent surface dust from falling into the inlet chamber. Wipe the housing interior and seat with a clean cloth; dust on the seat will prevent proper sealing of the 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 rubber on the sealing surface is the most common cause of leakage; the new element may appear to seat properly but is actually pressing on a ring of old rubber.
Step 5: Verify new part Compare new element with old side by side: outer diameter, overall height, seal face position. Verify the part number on the housing is 47557738001. If the 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 the outer ring by hand to confirm contact, then install cover. Tighten evenly; do not tighten only one side, as uneven force on the sealing surface will leave gaps.
Step 7: Restore and test run Restore power, start the unit, run unloaded for a few minutes. Listen for abnormal noise at inlet (leakage may cause whistling), check if 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 Record hour meter reading, replacement date, old and new pressure drop, and part number in the maintenance log. For the next interval decision, this line is more accurate than any manual.
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 install in the same position and look similar, but the media and dust holding capacity differ. The standard part is for normal inlet environments; the high-dust part is for sites with significantly higher dust levels. Installing the wrong one will not cause immediate failure, but the replacement interval will be noticeably incorrect.
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 purchasing; do not just look at the leading numbers.
Q3: How many hours between replacements?
4000 hours under standard conditions. In dusty sites, do not rely solely on hours; check pressure drop: replace at 1.0–1.5 kPa (per panel setting). Some domestic channels state 2000 hours; this figure is conservative and can be used as an early margin in dusty environments.
Q4: Can I blow the element clean and reuse it?
Not recommended. Blowing compressed air from inside out will loosen media fibers and deform pleat spacing, reducing dust holding capacity—and this is not visible. Short-term savings often result in dust being sent into the airend.
Q5: Can it be washed with water?
No. Wood pulp fiber filter paper loses fiber bonding strength when wet; after drying, both strength and efficiency degrade.
Q6: Pressure drop is high right after installation. Is it the element?
Check installation first. Residual old gasket on sealing surface, uneven cover tightening, or element not fully seated can all cause high pressure drop. 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 readings: if inlet negative pressure (or air filter pressure drop) increases while discharge temperature remains relatively 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 together with the air filter?
According to the maintenance kit structure, at the 4000-hour interval also replace the 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 of course possible, but do not delay the intervals for other parts.
Q9: Why is there a big price difference for the same model air filter?
The difference mainly comes from media and workmanship: 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 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 storage conditions, use within 3 years is recommended. Media that has been exposed to moisture may look normal but has reduced strength; when installed, it may collapse under negative pressure and block the inlet.
6. Compatible Models
| Model | Applicable | 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 inlet part number |
| RS45ne / RS55ne / RS75ne | No | Same as above |
| Other RS series (RS30, RS90 and above) | No | Different frame, inlet parts not interchangeable |
| High-dust configuration RS45i / RS55i / RS75i | No | Use 24900318 for this configuration |
Verification method: check the full model on the unit nameplate (including suffix), then compare the part number in the inlet section of parts manual 47612270. Both must match for this part to be correct.
7. Related Parts
The following are parts in the same family as RS45i / RS55i / RS75i, related to the inlet side or the same maintenance interval:
| Part Number | Name | Relationship |
|---|---|---|
| 24900318 | High-dust air filter element | Upgrade part in same position. Use this number for high-dust sites |
| 24900433 | Oil filter element (FILTER, COOLANT) | Same 4000-hour maintenance interval, replace together 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 element |
| 47784007001 | 4000h maintenance kit with dryer | Includes this part + oil filter element + dryer filter element |
| 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; please refer to the maintenance kit list in the unit's parts manual before ordering. Units with and without refrigerated dryers have different 4000-hour kit numbers; do not mix them.