Product
Ingersoll Rand 47557738001 Standard Air Filter | RS45i/RS55i/RS75i
Ingersoll Rand 47557738001 standard air 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 intake air filter element used on Ingersoll Rand RS45i, RS55i, and RS75i screw air compressors. In the parts manual, its English name is ELEMENT, AIR FILTER (STANDARD).
It is located after the compressor intake and before 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. 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 cause an immediate fault, but in high-dust environments, the standard element will clog prematurely and the replacement interval will be significantly shortened. When purchasing, first assess the site conditions, then determine the part number.
Another common pitfall: this part number does not apply to units with IE or NE suffixes in the model. RS45i and RS45ie, RS45ne are different configurations, and intake parts are not interchangeable.
2. Basic Parameters
| Item | Content |
|---|---|
| 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 | Units with IE / NE suffix; high-dust configuration units (use 24900318 for that configuration) |
| 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 Parameters (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-filtration grade, characterized by efficiency and dust holding capacity; not comparable to ventilation/AC 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. After water washing, paper filter media fibers collapse, reducing both dust holding capacity and efficiency |
These figures are useful for judging whether to replace and whether the grade is correct, but not for acceptance testing. 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 displacement |
| 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), subject to unit panel settings |
| Pressure Drop vs. Energy Consumption | For every 1 kPa increase in intake resistance, shaft power increases by approx. 0.3%–0.5% at the same discharge volume |
Air filters should be replaced not only when clogged, but when they reach a certain clogging point. When 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 electricity consumed by a 75 kW unit during the second half of the filter's life often exceeds the cost of the filter itself.
3.3 Structural Dimensions and Installation Parameters
| Parameter | Value / Description |
|---|---|
| Dimensions | Depends on intake box design; not specified on this page; refer to actual measurement of old part |
| Effective Filtration Area | Typically 1.5–4 m² for similar parts |
| Pleat Count / Pitch | Depends on filter media and area design; refer to actual count |
| Mounting Interface | Fits into intake box seat, positioned by end face seal; not threaded, not clamped |
| Sealing Type | Soft sealing ring on end cap, formed by box compression |
| Installation Orientation | Front and back sides; sealing face toward seat, do not install reversed |
Before ordering, it is easiest to remove the old part and measure three dimensions: outer diameter, overall height, and seal face inner diameter. Matching these three numbers essentially 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 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 sealing ring, or polyurethane foam end caps | Also serve as sealing carrier |
| Sealing Element | Nitrile rubber (NBR) or polyurethane | Ensures no bypass between filter and seat |
| Adhesive Layer | Hot melt adhesive or polyurethane adhesive | Fixes end caps to filter media |
3.5 Operating Condition Tolerance Parameters
| Parameter | Value / Description |
|---|---|
| Operating Temperature | Normal intake conditions, approx. −20 °C to +80 °C |
| Relative Humidity | Can withstand high-humidity intake; not suitable for intake with continuous liquid water droplets |
| Burst Strength / Collapse Pressure | Must withstand intake negative pressure after clogging without collapsing; specific value per manufacturer drawings |
| Special Functions | None. Standard type does not have oil-proof, water-proof, or flame-retardant treatments |
3.6 Lifetime and Maintenance Parameters
| Parameter | Value / Description |
|---|---|
| Recommended Replacement Interval | 4000 hours (standard conditions) |
| Interval in Dusty Environments | Significantly shorter; judge by pressure differential, do not rigidly follow hours |
| 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; moisture reduces media strength |
For continuous operation, base replacement on hours; 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 replacement trigger in dusty environments.
3.7 Standards
| Item | Description |
|---|---|
| Manufacturer Standard | Ingersoll Rand original parts standard |
| Filtration Performance Testing | Referenced to air filter test frameworks such as ISO 5011; specific test reports not attached to this part number |
| Environmental / Material Compliance | Subject to documentation 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 are not applicable to intake air filters and should not be used as performance basis during procurement.
4. Standard Maintenance and Installation Steps
Step 1: Stop machine, disconnect power, release pressure Press the stop button, disconnect main power and lock out/tag out, wait for internal pressure to fully release. Intake side pressure is low, but there is residual pressure on the main unit side; airflow may turn the rotor during disassembly. Wait until the pressure gauge reads zero before proceeding.
Step 2: Record pressure differential before replacement Before disassembly, read the current intake resistance from the panel or differential gauge and record it. This value is the only basis for judging whether replacement is early or late; once removed, it is lost. Also record the hour meter reading.
Step 3: Open intake box, remove old filter Loosen the box cover or clamping mechanism and remove the old filter. Keep the filter level during removal to prevent surface dust from falling into the intake chamber. Wipe the inside of the box and the seat with a clean cloth; dust on the seat can prevent proper sealing of the new filter.
Step 4: Inspect seat and sealing surface Check three points: seat deformation, old seal ring residue on sealing surface, and condition of cover clamping mechanism. Residual rubber ring on sealing surface is the most common cause of air leakage; the new filter may appear seated but is actually pressing on an old rubber ring.
Step 5: Verify new part Compare new filter with old part side by side: outer diameter, overall height, seal face position. Also verify the part number on the box is 47557738001. If the site is a high-dust configuration, this step will reveal the issue—high-dust models require 24900318.
Step 6: Install new filter With 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 bolts on one side only, as uneven force on the sealing surface can leave gaps.
Step 7: Restore and test run Restore power, start the unit, and run unloaded for a few minutes. Listen for abnormal noise at intake (leakage may cause whistling), and check whether panel pressure differential returns to new part level (approx. 0.2–0.5 kPa). If pressure differential is high, first check installation; do not rush to blame the filter.
Step 8: Record Enter hour meter reading, replacement date, old and new pressure differentials, and part number in the maintenance log. For future interval decisions, this line is more accurate than any manual.
5. Frequently Asked Questions
Q1: What is the difference between 47557738001 and 24900318?
The former is the standard intake filter, the latter is the high-dust intake filter. They install in the same location and look similar, but the filter media and dust holding capacity differ. The standard part is for normal intake environments; the high-dust part is for sites with significantly high 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 only corresponds to RS45i, RS55i, RS75i. Units with IE or NE suffixes have different intake part numbers. Before buying, read the full model on the nameplate; do not just look at the leading numbers.
Q3: How many hours before replacement?
4000 hours under standard conditions. In dusty sites, do not rigidly follow hours; check pressure differential: replace at 1.0–1.5 kPa (subject to panel setting). Some domestic channels state 2000 hours; this figure is conservative and can be used as an early replacement trigger in dusty environments.
Q4: Can I blow the filter with compressed air and reuse it?
Not recommended. Blowing compressed air from inside out will loosen filter media fibers and deform pleat spacing, reducing dust holding capacity, and the damage is invisible. It may seem to save a part in the short term, but actually sends dust into the main unit.
Q5: Can it be washed with water?
No. Wood pulp fiber filter paper loses fiber bonding when wet, and after drying, both strength and efficiency degrade.
Q6: The pressure differential is high right after installation. Is it a filter problem?
First check installation. Residual old rubber ring on sealing surface, uneven cover clamping, or filter not fully seated can all cause high pressure differential. After ruling out these three, then suspect the filter itself.
Q7: How to tell if the air filter is clogged or the oil filter is clogged?
Look at two values: if intake negative pressure (or air filter pressure differential) rises while discharge temperature changes little, it is likely the air filter; a clogged oil filter is usually accompanied by oil pressure changes and rising discharge temperature. Reading both values 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 oil filter 24900433; at 8000 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?
The price difference mainly comes from filter 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 differential, 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, it is recommended to use within 3 years. Moisture-affected filter media may look normal, but strength has decreased, and it may collapse under negative pressure and block intake after installation.
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 that 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 to be correct.
7. Related Parts
The following are parts from the same RS45i / RS55i / RS75i family related to the intake side or the same maintenance interval:
| Part Number | Name | Relationship |
|---|---|---|
| 24900318 | High-dust air filter | Upgrade for same location. Use this number in high-dust sites |
| 24900433 | Oil filter (FILTER, COOLANT) | Same 4000-hour maintenance interval; replace together with air filter |
| 23708423 | Oil separator | 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 configuration |
| 47784006001 | 4000h standard maintenance kit | Includes 1 x this part + 1 x 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's parts manual. Units with and without refrigerated dryers have different 4000-hour kit numbers; do not mix them.