Product
Ingersoll Rand 47557738001 Standard Air Filter | RS45i/RS55i/RS75i
Ingersoll Rand 47557738001 standard air intake filter for RS45i, RS55i, and RS75i screw compressors. Recommended replacement at 4000 hours under standard conditions; not for IE/NE suffix units 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 screw compressors. In the parts manual, the English description 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 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 immediately trigger a 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. RS45i, RS45ie, and RS45ne are different configurations, and intake parts are not interchangeable.
2. Basic Specifications
| Item | Details |
|---|---|
| Part Number | 47557738001 |
| English Description | ELEMENT, AIR FILTER (STANDARD) |
| Chinese Description | Standard Air Filter Element (Standard Intake Filter) |
| Brand | Ingersoll Rand |
| Part Type | Intake filtration consumable, complete replacement |
| Compatible Models | RS45i, RS55i, RS75i |
| Incompatible Models | Units with IE / NE suffix; high-dust configuration units (use 24900318 for that configuration) |
| Installation Location | Between the intake and the main air inlet valve |
| Replacement Interval | 4000 hours under standard conditions; in dusty environments, replace earlier based on pressure differential |
3. Technical Specifications
3.1 Filtration Performance (Core Metrics)
| Parameter | Value / Description |
|---|---|
| Filtration Rating | Approx. 3–10 μm, primarily captures particles larger than 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 classified under ventilation/air conditioning systems (e.g., G4 / F7) |
| 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 useful for judging whether to replace and whether the correct grade was purchased, but are not suitable as acceptance criteria. 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 the discharge capacities of RS45i / RS55i / RS75i |
| Initial Pressure Drop (Initial Resistance) | Approx. 0.2–0.5 kPa (2–5 mbar) |
| Operating Pressure Differential Range | Continuously rises from new installation 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 approximately 0.3%–0.5% at the same discharge volume |
The air filter element should be replaced not only when clogged, but when it reaches a certain clogging point. As the pressure differential rises from 0.3 kPa to 1.2 kPa, the machine still runs, but electricity costs are already higher. 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 Structural Dimensions and Installation Parameters
| Parameter | Value / Description |
|---|---|
| Dimensions | Depends on intake housing design; not specified on this page; refer to measurements of the old part |
| 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 the actual part |
| Mounting Interface | Fits into the intake housing seat, positioned by face seal; not threaded, not clamped |
| Sealing Method | Soft sealing ring on end cap, formed by housing compression force |
| Installation Orientation | Front and back sides are distinct; sealing face toward the seat; do not install backwards |
Before ordering, the easiest approach is to remove the old part and measure three dimensions: outer diameter, overall height, and seal face inner diameter. Matching these three numbers essentially eliminates errors.
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 Layer | Hot melt adhesive or polyurethane adhesive | Bonds end caps to filter 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 Resistance | Must withstand intake negative pressure after filter clogging without collapsing; specific value subject to manufacturer drawings |
| Special Features | 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 differential, not by rigid hour count |
| Intermediate Inspection | Recommended every 2000 hours or quarterly: check filter surface and pressure differential |
| Shelf Life | Unopened, stored in dry, dark conditions; recommended use within 3 years; moisture reduces media strength |
For continuously operating units, hours-based intervals are primary; for sites with intermittent operation or quarterly maintenance, calendar-based intervals apply, whichever comes first. Some domestic channels state approximately 2000 hours; this figure is conservative and can be used as an early replacement guide 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 reports are not attached to this part number |
| Environmental / Material Compliance | Subject to documents supplied with shipment |
Replacement part documentation commonly cites ISO 2941 / 2942 / 2943 series, which are hydraulic filter standards, and ISO 16889 multi-pass method for liquid filtration; these do not apply to intake air filters and should not be used as performance criteria when purchasing.
4. Standard Maintenance and Installation Steps
Step 1: Stop, disconnect power, and relieve pressure. Press the stop button, disconnect the main power supply and lock out/tag out, and wait for internal pressure to fully relieve. Intake pressure is not high, but residual pressure on the compressor side may cause the rotor to be driven by airflow during disassembly. Wait until the pressure gauge reads zero before proceeding.
Step 2: Record the pressure differential before replacement. Before disassembly, read the current intake resistance from the panel or pressure differential gauge and record it. This number is the only basis for judging whether replacement was early or late; once removed, it is lost. Also record the hour meter reading.
Step 3: Open the intake housing and remove the old element. Loosen the housing 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 housing interior and seat with a clean cloth; dust on the seat can prevent proper sealing of the new element.
Step 4: Inspect the seat and sealing surface. Check three points: whether the seat is deformed, whether old seal ring residue remains on the sealing surface, and whether the cover clamping mechanism is intact. 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 a ring of old rubber.
Step 5: Verify the new part. Compare the new element side-by-side with the old one: outer diameter, overall height, and seal face position. Also verify that the part number on the housing is 47557738001. If the site has 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 insert at an angle. After positioning, press the outer ring by hand to confirm fit, then install the cover. Tighten evenly; do not tighten bolts on only one side, as uneven force on the sealing surface can leave gaps.
Step 7: Reassemble and test run. Restore power, start the unit, and run at no load for a few minutes. Listen for abnormal noise at the intake (leaks may cause a whistling sound) and check whether the panel pressure differential returns to new-element level (approx. 0.2–0.5 kPa). If the pressure differential is high, first check installation; do not immediately suspect the element.
Step 8: Record. Write the 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 element; the latter is the high-dust intake filter element. Both 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 notably high dust levels. Installing the wrong one will not cause immediate failure, but the replacement 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. Before purchasing, read the full model on the nameplate, not just the leading numbers.
Q3: How often should it be replaced?
Under standard conditions, every 4000 hours. In dusty sites, do not rely solely on hours; check the pressure differential: replace when it reaches 1.0–1.5 kPa (subject to panel settings). Some domestic channels state 2000 hours; this figure is conservative and can be used as an early replacement guide in dusty environments.
Q4: Can I blow it out and reuse it?
Not recommended. Blowing compressed air from the inside out will loosen the filter media fibers and deform pleat spacing, reducing dust holding capacity, and this is not visible to the eye. 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 strength when wet, and both strength and efficiency degrade after drying.
Q6: The pressure differential is high right after installation. Is it a filter problem?
Check installation first. Residual old rubber ring on the sealing surface, uneven cover clamping, or incomplete seating of the element can all cause high pressure differential. 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 readings: if intake negative pressure (or air filter pressure differential) 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 together is more accurate than reading 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 the air filter alone is certainly 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 price difference mainly comes from filter media and workmanship: filter paper basis weight, pleat count, support strength, and end cap sealing method. Cheaper parts often cut corners in these invisible areas, resulting in higher initial pressure differential, lower dust holding capacity, and easier collapse when damp. For continuously operating units, this price difference is usually offset by electricity costs and downtime.
Q10: Can it still be used after long storage?
Under unopened, dry, and dark conditions, it is recommended to use within 3 years. Moisture-affected filter media may appear 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 | 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 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 against the intake section of parts manual 47612270. Only when both match is this the correct 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 | Description | Relationship |
|---|---|---|
| 24900318 | High-dust air filter element | Upgrade for same location. 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 used on 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 purchasing, refer to the maintenance kit list in the parts manual supplied with the unit. Units with and without refrigerated dryers have different 4000-hour kit numbers; do not mix them.