Product
Ingersoll Rand 47557738001 Standard Air Filter | RS45i/55i/75i
Ingersoll Rand 47557738001 standard air filter element for RS45i, RS55i and RS75i screw compressors. 4000-hour service interval under standard intake 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 intake air filter element used on Ingersoll Rand RS45i, RS55i and RS75i screw compressors. The English designation in the parts manual is ELEMENT, AIR FILTER (STANDARD).
It is positioned after the unit intake and before the main intake valve. Ambient air passes through it first before entering the compression chamber. If dust particles enter the airend directly, they wear the rotor and housing clearance; once the clearance increases, volumetric efficiency drops, and the wear is irreversible. The air filter element guards this critical point.
For these same three models, there are two intake-side 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 shortened. Check the site conditions first, then confirm 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 |
| Applicable Models | RS45i, RS55i, RS75i |
| Not Applicable | Units with IE / NE suffix; high-dust configuration units (use 24900318 for that configuration) |
| Installation Position | Between intake port and main intake valve |
| Replacement Interval | 4000 hours under standard conditions; earlier in dusty environments based on differential pressure |
3. Technical Specifications
3.1 Filtration Performance (Core Indicators)
| Parameter | Value / Description |
|---|---|
| Filtration Rating | Approx. 3–10 μm, primarily capturing particles above 10 μm |
| Filtration Efficiency | ≥99% (standard test dust, rated airflow) |
| Filter Class | Intake pre-filtration grade, characterized by efficiency and dust holding capacity; not comparable to HVAC classification (G4 / F7 etc.) |
| Dust Holding Capacity | Typically 200–400 g for similar parts; exact value per incoming inspection or manufacturer data |
| Cleanable / Reusable | Not recommended. After water washing, paper 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; they are not suitable as acceptance criteria. For acceptance, use differential pressure.
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 Differential Pressure 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 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 |
The air filter should be replaced not only when clogged, but when it reaches a certain point. As differential pressure 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 power consumed by a 75 kW unit during the latter half of the filter's life often exceeds the price of the filter itself.
3.3 Dimensions and Installation Parameters
| Parameter | Value / Description |
|---|---|
| Overall Dimensions | Depends on intake 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 intake box seat, located by end-face seal; not threaded, not clamped |
| Sealing Method | Soft sealing ring on end cap, formed by box clamping force |
| Installation Orientation | Front and back sides; sealing face toward seat, do not install reversed |
Before ordering, remove the old element 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 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 serves as seal carrier |
| Sealing Element | Nitrile rubber (NBR) or polyurethane | Ensures no bypass between element and seat |
| Adhesive | Hot melt glue or polyurethane adhesive | Fixes end caps to media |
3.5 Operating Condition Tolerance
| 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 collapse; exact value per manufacturer drawing |
| 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 | Noticeably shorter; judge by differential pressure, not fixed hours |
| Intermediate Inspection | Recommended every 2000 hours or quarterly: check element surface and differential pressure |
| Shelf Life | Unopened, stored dry and away from light, 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 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 genuine parts standard |
| Filtration Performance Testing | References air filter test frameworks such as ISO 5011; specific test report not included with this part number |
| Environmental / Material Compliance | Per documentation supplied with shipment |
The ISO 2941 / 2942 / 2943 series commonly seen in replacement part documentation are hydraulic filter standards; ISO 16889 multi-pass method is for liquid filtration. Neither applies to intake air filters and should not be used as performance criteria for procurement.
4. Standard Maintenance and Installation Steps
Step 1: Shut down, disconnect power, release pressure Press the stop button, then disconnect the main power and attach a lockout tag. Wait for internal pressure to fully release. Intake-side pressure is low, but residual pressure on the airend side may cause the rotor to turn during disassembly. Wait until the pressure gauge reads zero before proceeding.
Step 2: Record differential pressure before replacement Before removal, read the current intake resistance from the panel or differential pressure 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 the intake box and remove the 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 box 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 Check three points: seat deformation, old seal ring residue on the sealing surface, and condition of the cover clamping mechanism. Residual rubber ring on the sealing surface is the most common cause of air leaks; the new element may appear seated but is actually pressing on an old rubber ring.
Step 5: Verify the new part Compare the new element with the old one side by side: outer diameter, overall height, and 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 the new element With the sealing face toward the seat, insert vertically; do not angle it. After seating, press the outer ring by hand to confirm contact, then install the 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, and run unloaded for a few minutes. Listen for abnormal noise at the intake (leaks cause whistling) and check whether the panel differential pressure drops to new-element level (approx. 0.2–0.5 kPa). If pressure is high, first check installation; do not immediately suspect the element.
Step 8: Record Record the hour meter reading, replacement date, old and new differential pressures, and part number in the maintenance log. This line will be 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 fit the same position and look similar, but media and dust holding capacity differ. The standard part is for normal intake environments; the high-dust part is for sites with noticeably high dust. Installing the wrong one will not cause immediate failure, but the service interval will be clearly incorrect.
Q2: My machine is RS45ie. Can I use this?
No. This part number corresponds only to RS45i, RS55i, and RS75i. Units with IE or NE suffixes use different intake part numbers. Read the full model on the nameplate before purchasing, not just the leading numbers.
Q3: How many hours between replacements?
4000 hours under standard conditions. In dusty sites, do not rely solely on hours; monitor differential pressure: 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 the element clean and reuse it?
Not recommended. Blowing compressed air from the inside out loosens media fibers and deforms pleat spacing, reducing dust holding capacity, often invisibly. It may seem to save a part short-term, but actually sends dust into the airend.
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 differential pressure is high right after installation. Is it the element?
Check installation first. Residual old rubber ring on the sealing surface, uneven cover clamping, or incomplete seating can all cause high differential pressure. After ruling out these three, then suspect the element itself.
Q7: How can I tell if the air filter is clogged or the oil filter is clogged?
Look at two values: if intake negative pressure (or air filter differential pressure) 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. 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 the oil filter element 24900433; at 8000 hours also add the oil separator element 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 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 conditions, use within 3 years. Moisture-affected media may look normal but strength has degraded; when installed, it may collapse under negative pressure and block intake.
6. Compatible Models
| Model | Compatibility | 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 intake part number |
| RS45ne / RS55ne / RS75ne | No | Same as above |
| Other RS series (RS30, RS90 and above) | No | Different frame; intake parts not interchangeable |
| High-dust configuration RS45i / RS55i / RS75i | No | 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 in 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 element | Upgrade at 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 (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 |
| 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 ordering, refer to the maintenance kit list in the unit parts manual. Units with and without refrigerated dryers have different 4000-hour kit numbers; do not mix them.