Product
Ingersoll Rand 47557738001 Standard Air Filter | RS45i/55i/75i
Ingersoll Rand 47557738001 standard air filter element for RS45i, RS55i and RS75i screw compressors. 3–10 μm filtration, ≥99% efficiency, 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 screw compressors. The English designation in the parts manual is ELEMENT, AIR FILTER (STANDARD).
It is positioned after the machine air inlet and before the main intake valve. Outside air passes through it first, then enters 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 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, and installing the wrong one will not trigger an immediate fault, but in high-dust sites the standard element will clog prematurely and the replacement interval will be significantly shortened. Check site conditions first, then decide 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) |
| Installation Position | Between air inlet and main intake valve |
| Replacement Interval | 4000 hours under standard conditions; earlier in dusty environments based on pressure drop |
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 applicable to ventilation/AC classification (G4 / F7 etc.) |
| Dust Holding Capacity | Typical 200–400 g for similar parts; exact value per incoming inspection or manufacturer data |
| Cleanable / Reusable | Not recommended. Paper media fibers collapse after water washing, reducing both dust holding capacity and efficiency |
These figures are useful for judging whether to replace and whether the correct 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; covers intake air volume for RS45i / RS55i / RS75i displacement |
| Initial Pressure Drop | Approx. 0.2–0.5 kPa (2–5 mbar) |
| Operating Pressure Differential | Continuously rises from new to replacement point; no fixed value |
| Alarm / Final Resistance | Typical setting 1.0–1.5 kPa (10–15 mbar); refer to machine panel setting |
| Pressure Drop vs. Energy | Each 1 kPa increase in intake resistance raises shaft power by approx. 0.3%–0.5% at same discharge volume |
The air filter should be replaced when it reaches a certain pressure drop, not only when fully clogged. As pressure drop 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 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 old part |
| Effective Filtration Area | Typically 1.5–4 m² for similar parts |
| Pleat Count / Spacing | Depends on media and area design; count on actual part |
| 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 compression |
| Installation Orientation | Oriented; sealing face toward seat, do not reverse |
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 paper (resin impregnated for reinforcement) | Standard intake grade configuration |
| Media Weight | Typical 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 sealing ring, or polyurethane foam end caps | Also serves as sealing carrier |
| Sealing Element | Nitrile rubber (NBR) or polyurethane | Ensures no bypass at seat |
| Adhesive | Hot melt 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 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 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 drop, not fixed hours |
| Intermediate Inspection | Recommended every 2000 hours or quarterly: check filter surface and pressure drop |
| Shelf Life | Unopened, dry, dark storage; use within 3 years. Moisture reduces media strength |
For continuous operation, follow hours; for intermittent operation or quarterly maintenance, follow calendar intervals, whichever comes first. Some domestic channels state approx. 2000 hours; this is conservative and can be taken as an early margin for dusty environments.
3.7 Standards
| Item | Description |
|---|---|
| Manufacturer Standard | Ingersoll Rand genuine parts standard |
| Filtration Performance Test | Refer to air filter test framework such as ISO 5011; no specific test report attached for this part number |
| Environmental / Material Compliance | Per accompanying documentation |
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 do not apply 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, depressurize 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 movement during disassembly. Wait until pressure gauge reads zero.
Step 2: Record pressure drop before replacement Before removal, read and record current intake resistance from panel or differential pressure gauge. This is the only basis for judging early or late replacement; it is lost after removal. Also record hour meter reading.
Step 3: Open intake box, remove old element Loosen box cover or clamping mechanism and remove old element. Keep element horizontal during removal to prevent surface dust falling into intake chamber. Wipe interior walls 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 seal ring residue on sealing surface, and condition of cover clamping mechanism. Residual rubber ring on sealing surface is the most common cause of air leakage; new element may appear 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 face position. Also check part number on box is 47557738001. If site is high-dust configuration, this step will reveal the issue—high-dust machines require 24900318.
Step 6: Install new element Sealing face toward seat, insert vertically, do not tilt. After seating, press outer ring by hand to confirm contact, then install cover. Tighten evenly; do not tighten one bolt only, 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 (whistling indicates leakage), check 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 filter.
Step 8: Record Write hour meter reading, replacement date, old/new pressure drop, and part number in 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 position and look similar, but media and dust holding capacity differ. Standard element for normal intake environments; high-dust element for sites with significantly high dust. Installing the wrong one will not cause immediate failure, but the 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 purchasing, 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 drop: replace at 1.0–1.5 kPa (per panel setting). Some domestic channels state 2000 hours; this is conservative and can be taken as an early margin for dusty environments.
Q4: Can I blow clean the filter and reuse?
Not recommended. Blowing compressed air from inside out loosens fibers and deforms pleats, reducing dust holding capacity, often invisibly. Short-term savings may 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 drop is high right after installation. Is it the filter?
Check installation first. Residual old rubber ring on sealing surface, uneven cover tightening, or element not fully seated can all cause high pressure drop. After ruling out these three, then suspect the filter itself.
Q7: How to tell if air filter or oil filter is clogged?
Check two values: intake negative pressure (or air filter pressure drop) rises with little change in discharge temperature—likely air filter. Clogged oil filter usually comes with oil pressure change and rising discharge temperature. Read both together for better accuracy.
Q8: What else should be replaced together with the air filter?
Per maintenance kit structure, at 4000 hours 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 do not delay other items.
Q9: Why is there a big price difference for the same model air filter?
Price differences mainly come 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 easy collapse when damp. For continuously running units, the price difference is usually offset by electricity and downtime.
Q10: Can I use it 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 | Applicable | Notes |
|---|---|---|
| RS45i | Yes | Part number 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 this configuration |
Verification method: check full model (including suffix) on machine nameplate, 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 part for same position. 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 1 x this part + 1 x 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 kits |
Maintenance kits are tiered by machine configuration; refer to the maintenance kit list in the machine parts manual before ordering. Units with and without refrigerated dryer have different 4000-hour kit numbers; do not mix.