Product
Ingersoll Rand 47557738001 Standard Air Filter for RS45i/RS55i/RS75i
Ingersoll Rand 47557738001 standard air intake filter for RS45i, RS55i, and RS75i screw compressors. 4000-hour service interval under standard conditions. Not for IE/NE suffix models 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. The English name in the parts manual is ELEMENT, AIR FILTER (STANDARD).
It is located after the compressor intake and before the main 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; as the clearance increases, pumping 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; installing the wrong one will not cause an immediate fault, but in dusty sites the standard element will clog prematurely and the replacement interval will be significantly shortened. Check the site conditions before deciding on the part number.
Another common pitfall: this part number does not apply to units with IE or NE suffixes. RS45i and RS45ie/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 |
| Compatible Models | RS45i, RS55i, RS75i |
| Incompatible Models | Units with IE/NE suffix; high-dust configuration units (use 24900318 for those) |
| Installation Location | Between intake and main inlet valve |
| Replacement Interval | 4000 hours under standard conditions; earlier in dusty environments based on pressure drop |
3. Technical Specifications
3.1 Filtration Performance (Core Metrics)
| 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 classified by HVAC standards (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 water washing, reducing both dust holding capacity and efficiency. |
These figures are useful for judging whether to replace and whether the grade is correct, but not as acceptance criteria. For acceptance, use pressure drop.
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 Pressure Drop Range | Rises continuously from new to replacement point; no fixed value |
| Alarm / Final Resistance | Typical setting 1.0–1.5 kPa (10–15 mbar); refer 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 |
Air filters should be replaced when they reach a certain pressure drop, not only when 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 energy 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 |
|---|---|
| Dimensions | Depend on intake box design; not specified on this page; measure old part |
| Effective Filtration Area | Typically 1.5–4 m² for similar parts |
| Pleat Count / Pitch | Depends on media and area design; verify by counting on actual part |
| Mounting Interface | Fits into intake box seat, located by end-face seal; no threads or clamps |
| Sealing Method | Soft gasket on end cap, compressed by housing |
| Installation Orientation | Directional; sealing face toward seat, do not install backwards |
Before ordering, remove the old element and measure three dimensions: outer diameter, overall height, and seal 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 |
| 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 gasket, or polyurethane foam end caps | Also serve as seal carrier |
| Seal | NBR or polyurethane | Ensures no bypass at seat |
| Adhesive | Hot melt or polyurethane glue | Bonds end caps to media |
3.5 Operating Tolerance
| Parameter | Value / Description |
|---|---|
| Operating Temperature | Normal intake conditions, approx. −20 °C to +80 °C |
| Relative Humidity | Withstands high-humidity intake; not for continuous liquid water droplets |
| Burst / Collapse Pressure | Must withstand intake negative pressure after clogging without collapse; exact value per manufacturer drawing |
| Special Functions | None. Standard type without 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 drop, not fixed hours |
| Intermediate Inspection | Recommended every 2000 hours or quarterly: check element surface and pressure drop |
| Shelf Life | Unopened, dry, away from light: use within 3 years; moisture reduces media strength |
For continuous operation, use hours; for intermittent operation or quarterly maintenance, use calendar intervals, whichever comes first. Some domestic channels state about 2000 hours; this is conservative and can be taken as an early replacement guideline in dusty environments.
3.7 Standards
| Item | Description |
|---|---|
| Manufacturer Standard | Ingersoll Rand OEM part standard |
| Filtration Performance Test | Refers to air filter test framework such as ISO 5011; no specific test report attached to this part number |
| Environmental / Material Compliance | Per documentation supplied with goods |
Replacement part data often cites ISO 2941/2942/2943 series (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.
4. Standard Maintenance and Installation Steps
Step 1: Stop, disconnect power, relieve pressure Press stop button, disconnect main power and lock out, wait for internal pressure to bleed. Intake pressure is low, but residual pressure on the 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; once removed, it's gone. Also record hour meter reading.
Step 3: Open intake box, remove old element Loosen cover or clamping mechanism, remove old element. Keep it level to prevent surface dust from falling into intake chamber. Wipe inner walls and seat with a clean cloth; dust on seat can cause poor sealing.
Step 4: Inspect seat and sealing surface Check three points: seat deformation, old gasket residue on sealing surface, and cover clamping mechanism integrity. Residual gasket is the most common cause of air leaks; new element may seem seated but is actually resting on old rubber.
Step 5: Verify new part Compare new element with old side by side: outer diameter, overall height, seal position. Check part number on box is 47557738001. If site is high-dust configuration, this step will reveal the issue—high-dust models require 24900318.
Step 6: Install new element 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 one side 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 leak), check panel pressure drop returns to new part level (approx. 0.2–0.5 kPa). If pressure drop is high, first check installation, not the element.
Step 8: Record Enter 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, the latter is the high-dust intake filter. They fit the same location and look similar, but media and dust holding capacity differ. Standard is for normal intake environments; high-dust is for sites with significantly high dust. Wrong installation will not 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 use different intake part numbers. Read the full model on the nameplate before buying, not just the leading numbers.
Q3: How often should it be replaced?
4000 hours under standard conditions. In dusty sites, do not stick to 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 replacement guideline in dusty environments.
Q4: Can I blow it out 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 filter 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 gasket on sealing surface, uneven cover tightening, or element not fully seated can cause high pressure drop. After ruling these out, suspect the element.
Q7: How to tell if air filter or oil filter is clogged?
Look at two values: if intake negative pressure (or air filter pressure drop) rises without significant change in discharge temperature, it's likely the air filter; clogged oil filter usually comes with oil pressure change and rising discharge temperature. Read both together for accuracy.
Q8: What else should be replaced with the air filter?
According to 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 parts.
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 it be used after long storage?
Under unopened, dry, dark conditions, use within 3 years. Moist media may look normal but strength has degraded; installation may cause collapse under negative pressure and block 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 that configuration |
Verification method: check full model on unit nameplate (including suffix), then compare part number in intake section of parts manual 47612270. Both must match.
7. Related Parts
The following are parts from the same RS45i/RS55i/RS75i family, related to intake side or 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 (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 air filter + 1 oil filter |
| 47784007001 | 4000h Maintenance Kit with Dryer | Includes air filter + oil filter + dryer filter |
| 47784008001 | 8000h Standard Maintenance Kit | Includes air filter + oil filter + oil separator + return air filter + two valve service kits |
Maintenance kits are tiered by unit configuration; refer to the maintenance kit list in the unit parts manual before ordering. Units with and without refrigerated dryer have different 4000-hour kit numbers; do not mix.