Product
Ingersoll Rand 47557738001 Standard Air Filter for RS45i/RS55i/RS75i
Ingersoll Rand 47557738001 standard air filter element for RS45i, RS55i, and RS75i rotary screw compressors. 4000-hour service interval 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 intake air 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 unit's air intake and before the main air inlet valve. Outside 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—and the wear is irreversible. The air filter element guards this critical point.
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. Installing the wrong one will not trigger an immediate fault, but in high-dust environments, the standard element will clog prematurely and the replacement interval will be noticeably shorter. 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 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 Location | Between air 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 (Core Indicators)
| Parameter | Value / Description |
|---|---|
| Filtration Rating | Approx. 3–10 μm, primarily capturing particles above 10 μm |
| Filtration Efficiency | ≥99% (with standard test dust at rated airflow) |
| Filter Class | Intake pre-filtration grade, characterized by efficiency and dust holding capacity; not based on ventilation/AC classification (G4/F7 etc.) |
| Dust Holding Capacity | Typically 200–400 g for similar parts; exact value per incoming inspection or manufacturer data |
| Washable/Reusable | Not recommended. Paper filter media fibers collapse after washing, reducing both dust holding capacity and efficiency |
These figures help judge whether to replace and whether the correct grade was purchased; they are not acceptance criteria. For acceptance, use 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 | Rises continuously from new to replacement point; no fixed value |
| Alarm / Final Resistance | Typical setting 1.0–1.5 kPa (10–15 mbar), per unit panel setting |
| Pressure Drop vs. Energy Consumption | Each 1 kPa increase in intake resistance raises shaft power by approx. 0.3%–0.5% at same displacement |
Air filters are not replaced only when clogged; they should be replaced once they reach 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 over the second half of the filter's life often exceeds the filter's cost.
3.3 Dimensions and Installation Parameters
| Parameter | Value / Description |
|---|---|
| Dimensions | Depends on intake housing design; not marked on this page; measure old part |
| Effective Filtration Area | Typically 1.5–4 m² for similar parts |
| Pleat Count / Pitch | Depends on filter media and area design; verify by physical count |
| Mounting Interface | Fits into intake housing seat, positioned by end-face seal; not threaded, not clamped |
| Sealing Method | Soft gasket on end cap, compressed by housing |
| Installation Orientation | Directional; sealing face toward seat; do not install reversed |
Before ordering, remove the old element and measure three dimensions: outer diameter, overall height, and seal inner diameter. Matching these three ensures correct fit.
3.4 Material Construction
| Component | Material | Description |
|---|---|---|
| Filter Media | Wood pulp fiber paper (resin-impregnated for reinforcement) | Standard intake grade |
| Media Weight | Typically 120–160 g/m² for similar parts | 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 gasket, or polyurethane foam end caps | Also serve as sealing carrier |
| Seal | 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 for continuous liquid water droplets |
| Burst / Collapse Pressure | Must withstand intake negative pressure after clogging without collapse; specific value per manufacturer drawing |
| 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 filter surface and pressure differential |
| Shelf Life | Unopened, dry, dark storage; use within 3 years; moisture reduces media strength |
For continuous operation, hours-based interval applies; for intermittent operation or quarterly maintenance, calendar-based interval applies; whichever comes first. Some domestic channels state approx. 2000 hours; this is conservative and can be used as an early margin in dusty environments.
3.7 Standards
| Item | Description |
|---|---|
| Manufacturer Standard | Ingersoll Rand genuine parts standard |
| Filtration Performance Testing | References air filter test framework such as ISO 5011; this part number does not include a specific test report |
| Environmental / Material Compliance | Per documentation supplied with goods |
Replacement part documentation often cites ISO 2941/2942/2943 series—these are hydraulic filter standards; ISO 16889 multi-pass method is for liquid filtration. None apply to intake air filters and should not be used as performance basis.
4. Standard Maintenance and Installation Steps
Step 1: Stop, disconnect power, release pressure Press stop button, disconnect main power and lock out. Wait for internal pressure to fully release. Intake pressure is low, but residual pressure on main unit side may cause rotor to turn during disassembly. Wait until pressure gauge reads zero.
Step 2: Record pressure differential before replacement Before removal, read and record current intake resistance from panel or differential gauge. This is the only basis for judging early or late replacement; once removed, it's gone. Also record hour meter reading.
Step 3: Open intake housing, remove old element Loosen housing cover or clamping mechanism, remove old element. Keep element level during removal to prevent surface dust from falling into intake chamber. Wipe housing interior and seat with clean cloth; dust on seat can cause poor sealing of new element.
Step 4: Inspect seat and sealing surface Check three points: seat deformation, old gasket residue on sealing surface, and condition of cover clamping mechanism. Residual old gasket on sealing surface is the most common cause of air leaks; new element may seem seated but is actually pressing on old rubber.
Step 5: Verify new part Compare new element with old side by side: outer diameter, overall height, seal position. Verify part number on housing is 47557738001. If site is high-dust configuration, this step will reveal the issue—high-dust models require 24900318.
Step 6: Install new element With sealing face toward seat, insert vertically, do not tilt. After seating, press outer ring to confirm contact, then install cover. Tighten evenly; do not tighten only one side, as uneven force may leave gaps.
Step 7: Restore and test run Restore power, start unit, run unloaded for a few minutes. Listen for abnormal noise at intake (leaks may whistle), check panel pressure differential returns to new-element level (approx. 0.2–0.5 kPa). If differential is high, first check installation; do not immediately suspect the element.
Step 8: Record Record hour meter reading, replacement date, old and new pressure differentials, and part number in maintenance log. For future interval decisions, this line is more accurate than any manual.
5. FAQ
Q1: What is the difference between 47557738001 and 24900318?
The former is the standard intake air filter; the latter is the high-dust intake air filter. Both fit the same location and look similar, but media and dust holding capacity differ. Standard part for normal intake environments; high-dust part for sites with significantly high dust. Installing wrong one won't cause immediate fault, but 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 suffix have different intake part numbers. Read the full model on the nameplate before buying, not just the leading numbers.
Q3: How many hours between replacements?
4000 hours under standard conditions. In dusty sites, do not rely 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 an early margin in dusty environments.
Q4: Can I blow out the filter and reuse it?
Not recommended. Compressed air blown from inside out will loosen media fibers, deform pleat spacing, reduce dust holding capacity, and damage is not visible. Short-term savings may actually send dust into the main unit.
Q5: Can it be washed with water?
No. Wood pulp fiber paper loses fiber bonding when wet; after drying, strength and efficiency both degrade.
Q6: Pressure differential is high right after installation. Is it the filter's problem?
Check installation first. Residual old gasket on sealing surface, uneven cover tightening, or element not fully seated can cause high differential. After ruling out these three, then suspect the element itself.
Q7: How to tell if air filter or oil filter is clogged?
Look at two values: if intake negative pressure (or air filter differential) rises while discharge temperature changes little, likely air filter; if oil filter is clogged, usually accompanied by oil pressure change and discharge temperature rise. Reading both is more accurate than one alone.
Q8: What else should be replaced along with air filter?
Per maintenance kit structure, at 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 air filter alone is fine, but don't delay other parts' intervals.
Q9: Why is there a big price difference for same-model air filters?
Price difference mainly comes from media and workmanship: 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 easy 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-affected media may look normal but strength is reduced; installation may cause collapse under negative pressure and block intake.
6. Compatible Models
| Model | Compatible | 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 | Should use 24900318 |
Verification method: Check full model on unit nameplate (including suffix), then compare part number in intake section of parts manual 47612270. Both must match for this part.
7. Related Parts
The following are parts in the same family as RS45i/RS55i/RS75i, related to intake side or same maintenance interval:
| Part Number | Name | Relationship |
|---|---|---|
| 24900318 | High-dust air filter element | Upgrade for same location. Use this number in high-dust sites |
| 24900433 | Oil filter (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 configuration |
| 47784006001 | 4000h standard maintenance kit | Includes this part x1 + oil filter x1 |
| 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 dryer have different 4000-hour kit numbers; do not mix.