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, it is listed as ELEMENT, AIR FILTER (STANDARD).
It is located after the compressor intake and before the main intake 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 three models, two intake configurations are available: 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 and installing the wrong one will not trigger an immediate fault, but in dusty environments, the standard element will clog prematurely and the replacement interval will be significantly shortened. Always check the site conditions before selecting 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 |
| 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 (use 24900318) |
| Installation Location | Between intake and main intake valve |
| Replacement Interval | 4000 hours under standard conditions; earlier in dusty environments based on pressure differential |
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% (standard test dust, rated flow) |
| Filter Class | Intake pre-filter grade, characterized by efficiency and dust holding capacity; not comparable to ventilation HVAC classifications (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. Paper media fibers collapse after washing, reducing both dust holding capacity and efficiency |
These figures help determine whether to replace and whether the grade is correct, but they are not acceptance criteria. For acceptance, check the pressure differential.
3.2 Flow and Resistance Parameters
| Parameter | Value / Description |
|---|---|
| Rated Air Flow | 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 | Each 1 kPa increase in intake resistance raises shaft power by approx. 0.3%–0.5% at constant discharge |
The air filter should be replaced not only when clogged, but when it reaches a certain point. As 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 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 Dimensions and Installation Parameters
| Parameter | Value / Description |
|---|---|
| Dimensions | Depend on intake housing design; not specified on this page; verify by measuring 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 housing seat, located by end-face seal; not threaded, not clamped |
| Sealing Method | Soft sealing ring on end cap, compressed by housing |
| Installation Orientation | Oriented; sealing face toward seat, do not install backwards |
Before ordering, remove the old element and measure three dimensions: outer diameter, overall height, and seal face inner diameter. Matching these three ensures correct fit.
3.4 Material Construction
| Component | Material | Description |
|---|---|---|
| Filter Media | Wood pulp fiber paper (resin-impregnated reinforced) | Standard intake grade configuration |
| Media Weight | Typically 120–160 g/m² for similar parts | 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 seal carrier |
| Sealing Element | Nitrile rubber (NBR) or polyurethane | Ensures no bypass at seat |
| Adhesive | Hot melt or polyurethane adhesive | Bonds 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 handle high-humidity intake; not suitable for continuous liquid water droplets |
| Burst / Collapse Pressure | Must withstand intake negative pressure after clogging without collapse; specific value per manufacturer drawings |
| Special Features | None. Standard type without oil-proof, water-proof, or flame-retardant treatment |
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 fixed hours |
| Intermediate Inspection | Recommended every 2000 hours or quarterly: check element surface and pressure differential |
| Shelf Life | Unopened, store in dry, dark conditions; 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 is conservative and can be used as a margin for dusty environments.
3.7 Standards
| Item | Description |
|---|---|
| Manufacturer Standard | Ingersoll Rand original part standard |
| Filtration Performance Test | Referenced to air filter test frameworks such as ISO 5011; specific test reports not included with this part number |
| Environmental / Material Compliance | Per documentation supplied with goods |
Replacement part documentation often lists 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 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 bleed. Intake side pressure is low, but residual pressure on the main unit side can cause rotor movement during disassembly. Wait until the pressure gauge reads zero.
Step 2: Record pressure differential before replacement Before removal, read and record the current intake resistance from the panel or differential gauge. This is the only basis for judging whether replacement is early or late; once removed, it's gone. Also record the hour meter reading.
Step 3: Open intake housing, remove 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 seat and sealing surface Check three points: seat deformation, old seal ring 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 seated but is actually pressing on an old rubber ring.
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 machines require 24900318.
Step 6: Install new element With sealing face toward seat, insert vertically; do not tilt. After seating, press the outer ring by hand to confirm fit, then install cover. Tighten evenly; do not tighten only one side, as uneven pressure can leave gaps at the sealing surface.
Step 7: Restore and test run Restore power, start the unit, run unloaded for a few minutes. Listen for abnormal noise at intake (leaks may cause whistling), check panel pressure differential returns to new element level (approx. 0.2–0.5 kPa). If differential is high, first check installation, not the element.
Step 8: Record Enter hour meter reading, replacement date, old and new pressure differentials, and part number in the maintenance log. This line is 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 location 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 significantly elevated 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 applies to RS45i, RS55i, RS75i. Units with IE or NE suffix have 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; check pressure differential: replace at 1.0–1.5 kPa (per panel setting). Some domestic channels state 2000 hours; this is conservative and can be used as a margin for dusty environments.
Q4: Can I blow out the filter and reuse it?
Not recommended. Blowing compressed air from inside out loosens fibers and deforms pleats, reducing dust holding capacity, often invisibly. It may seem to save a part short-term, but actually sends dust into the main unit.
Q5: Can it be washed with water?
No. Wood pulp fiber paper loses fiber bonding when wet; after drying, both strength and efficiency degrade.
Q6: Pressure differential is high right after installation. Is the filter at fault?
Check installation first. Residual old rubber on sealing surface, uneven cover tightening, or element not fully seated can cause high differential. After ruling these out, then suspect the element itself.
Q7: How to tell if the air filter or oil filter is clogged?
Look at two values: if intake negative pressure (or air filter differential) rises while discharge temperature remains relatively stable, 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?
According to the maintenance kit structure, at the 4000-hour interval also replace oil filter element 24900433; at 8000 hours also add oil separator element 23708423, return air filter 88089743, and two valve service packs. Replacing the air filter alone 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 construction: paper 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 easier collapse when damp. For continuously running units, this price difference is usually offset by electricity and downtime costs.
Q10: Can it be used after long storage?
Under unopened, dry, dark conditions, use within 3 years. Moisture-damaged media may look normal but has reduced strength, and can collapse under negative pressure after installation, blocking 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 | Use 24900318 for this configuration |
Verification method: Check the full model (including suffix) on the unit nameplate, then compare part numbers in the intake section of parts manual 47612270. Both must match for this part.
7. Related Parts
The following are parts from 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 for same location. Use in high-dust sites |
| 24900433 | Oil filter element (FILTER, COOLANT) | Same 4000-hour maintenance interval, replace 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 |
| 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 + 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; refer to the parts manual kit list before ordering. Units with and without refrigerated dryers have different 4000-hour kit numbers; do not mix.