Product
Ingersoll Rand 47557738001 Standard Air Filter | RS45i/55i/75i
Ingersoll Rand 47557738001 standard air intake filter for RS45i, RS55i, and RS75i rotary screw compressors. 4000-hour service interval 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 rotary screw compressors. The English name in the parts manual 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 compressor directly, they will wear the rotor and casing clearance. Once the clearance increases, compression efficiency drops irreversibly. The air filter element serves as the barrier to prevent this.
For these 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 dusty environments, the standard element will clog prematurely and the replacement interval will be significantly shortened. When purchasing, first check the site conditions, then determine the part number.
Another common pitfall: this part number does not apply to units with IE or NE suffix in the model. RS45i and RS45ie, RS45ne are different configurations, and the 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 | Units with IE / NE suffix; high-dust configuration units (use 24900318) |
| Installation Position | Between intake and main air inlet valve |
| Replacement Interval | 4000 hours under standard conditions; earlier in dusty environments based on pressure drop |
3. Technical Specifications
3.1 Filtration Performance Parameters (Core Indicators)
| Parameter | Value / Description |
|---|---|
| Filtration Rating | Approx. 3–10 μm, primarily intercepting 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 applicable to ventilation/air conditioning classification (G4 / F7 etc.) |
| Dust Holding Capacity | Common range for similar parts: 200–400 g; exact value subject to incoming inspection or manufacturer data |
| Cleanable / Reusable | Not recommended. After water washing, paper filter media fibers collapse, and both dust holding capacity and efficiency decrease |
These figures are suitable for judging whether to replace or if the wrong grade was purchased, but not as acceptance criteria. For acceptance, check pressure drop.
3.2 Flow and Resistance Parameters
| Parameter | Value / Description |
|---|---|
| Rated Airflow | Varies by model, covering 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 | Common setting 1.0–1.5 kPa (10–15 mbar), subject to unit panel setting |
| 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 |
The air filter element should be replaced when it reaches a certain pressure drop, not only when completely clogged. As pressure drop rises from 0.3 kPa to 1.2 kPa, the machine still runs, but electricity costs increase. 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 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 old part measurement |
| Effective Filtration Area | Typically 1.5–4 m² for similar parts |
| Pleat Count / Pleat Spacing | Depends on filter media and area design; verify by counting on actual part |
| Installation Interface | Fits into intake box seat, positioned by end face seal; not threaded, not clamped |
| Sealing Method | Soft seal ring on end cap, formed by compression from housing |
| Installation Orientation | Oriented; sealing face toward seat, do not install backwards |
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 will basically ensure 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 Grammage | Common for similar parts: 120–160 g/m² | Grammage 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 Cap | Metal end cap with soft seal ring, or polyurethane foam end cap | Also serves as seal carrier |
| Seal | Nitrile rubber (NBR) or polyurethane | Ensures no bypass between element and seat |
| Adhesive Layer | Hot melt adhesive or polyurethane adhesive | Fixes end cap 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 long-term intake with liquid water droplets |
| Burst Strength / Collapse Pressure | Must withstand intake negative pressure after filter clogging without collapsing; specific value per manufacturer drawing |
| Special Features | None. Standard type does not have oil-proof, waterproof, flame-retardant or other special treatments |
3.6 Lifetime and Maintenance Parameters
| Parameter | Value / Description |
|---|---|
| Recommended Replacement Interval | 4000 hours (standard conditions) |
| Interval in Dusty Environments | Significantly shortened; judge by pressure drop, not by hours alone |
| 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; moisture reduces media strength |
For continuous operation, base replacement on hours; for intermittent operation or quarterly maintenance sites, use calendar intervals, whichever comes first. Some domestic channels state about 2000 hours; this figure is conservative and can be used as an early replacement margin in dusty environments.
3.7 Standards
| Item | Description |
|---|---|
| Manufacturer Standard | Ingersoll Rand genuine parts standard |
| Filtration Performance Test | Reference to ISO 5011 type air filter test framework; this part number does not include a specific test report |
| Environmental / Material Compliance | Subject to 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; 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, power off, depressurize Press the stop button, disconnect main power and lock out/tag out, wait for internal pressure to fully release. Intake pressure is not high, but there is residual pressure on the compressor side; the rotor may 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 intake resistance from the panel or pressure gauge. This number is the only basis for judging whether replacement is early or late, and it is lost after removal. Also record the hour meter reading.
Step 3: Open intake box, remove old element Loosen the box 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 inside of the housing and the seat with a clean cloth; dust on the seat will prevent proper sealing of the new element.
Step 4: Inspect seat and sealing surface Focus on three points: whether the seat is deformed, whether there is old seal ring residue on the sealing surface, and whether the cover clamping mechanism is intact. Residual rubber on the sealing surface is the most common cause of air leakage; the new element may appear seated but is actually pressing on a ring of old rubber.
Step 5: Verify new part Compare the new element with the old one side by side: outer diameter, overall height, seal face position. Also verify the part number on the housing 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 element With sealing face toward the seat, insert vertically; do not tilt. After seating, press the outer ring by hand to confirm fit, then install the cover. Tighten evenly; do not tighten bolts on one side only, otherwise uneven force on the sealing surface will 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 the intake (leakage may cause whistling), and 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 drops, and part number in the maintenance log. This line is more accurate than any manual for determining the next interval.
5. FAQ
Q1: What is the difference between 47557738001 and 24900318?
The former is the standard air intake filter, the latter is the high-dust air intake filter. They are installed in the same position 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 higher 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. Units with IE or NE suffix have different intake part numbers. Before buying, read the full model on the nameplate, not just the leading numbers.
Q3: How many hours between replacements?
4000 hours under standard conditions. In dusty sites, do not rely on hours alone; check pressure drop: replace when it reaches 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 margin 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 not visible. It may seem to save a part in the short term, but actually sends dust into the compressor.
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: Pressure drop is high right after installation. Is it the filter's problem?
Check installation first. Residual old rubber on the sealing surface, uneven cover tightening, or incomplete seating can all cause high pressure drop. After ruling out these three, then suspect the element itself.
Q7: How to tell if the air filter is clogged or the oil filter is clogged?
Check two values: if intake negative pressure (or air filter pressure drop) increases 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 the oil filter 24900433; at 8000 hours also add oil separator 23708423, return air filter 88089743, and two valve service packs. Replacing the air filter alone is of course possible, but do not delay the intervals of other parts.
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 grammage, 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 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; when installed, it may collapse under negative pressure 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 | Should use 24900318 for this configuration |
Verification method: Check the full model (including suffix) on the unit nameplate, then compare the part number in the intake section of parts manual 47612270. Both must match to confirm this part.
7. Related Parts
The following are parts in the same family for RS45i / RS55i / RS75i, related to the intake side or the same maintenance interval:
| Part Number | Name | Relationship |
|---|---|---|
| 24900318 | High-dust air filter element | Upgrade part for same position. Use this number in dusty sites |
| 24900433 | Oil filter (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 (DRYER FILTER) | Only for units with refrigerated dryer configuration |
| 47784006001 | 4000h standard maintenance kit | Includes 1 pc this part + 1 pc 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 packs |
Maintenance kits are tiered by unit configuration; please refer to the maintenance kit list in the accompanying parts manual before purchasing. Units with and without refrigerated dryers have different 4000-hour kit numbers; do not mix them.