Product
Ingersoll Rand 47557738001 Standard Air Filter | RS45i/55i/75i
Ingersoll Rand 47557738001 standard air filter element for RS45i, RS55i and RS75i screw compressors. For standard inlet conditions; 4000-hour replacement interval. Not for IE/NE suffix units or high-dust configurations (use 24900318). Order by part number.
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1. Product Overview
47557738001 is the standard inlet 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 located after the machine inlet 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; once the clearance increases, pumping efficiency drops—and the loss is irreversible. The air filter element guards this critical point.
For these three models, there are two inlet-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; installing the wrong one will not trigger an immediate fault, but in dusty sites the standard element will clog prematurely and the replacement interval will shorten noticeably. Check the site conditions first, then confirm 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 inlet 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 inlet filter) |
| Brand | Ingersoll Rand |
| Part type | Inlet 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 inlet and main inlet valve |
| Replacement interval | 4000 hours under standard conditions; earlier in dusty environments based on differential pressure |
3. Technical Specifications
3.1 Filtration Performance (Core Metrics)
| Parameter | Value / Description |
|---|---|
| Filtration rating | Approx. 3–10 μm; primarily captures particles above 10 μm |
| Filtration efficiency | ≥99% (with standard test dust at rated airflow) |
| Filter class | Inlet pre-filtration grade, characterized by efficiency and dust holding capacity; not classified under HVAC systems (G4 / F7 etc.) |
| Dust holding capacity | Common range for similar parts: 200–400 g; exact value per incoming inspection or manufacturer data |
| Washable / reusable | Not recommended. Paper media fibers collapse after 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 differential pressure.
3.2 Flow and Resistance Parameters
| Parameter | Value / Description |
|---|---|
| Rated airflow | Varies by model; covers inlet airflow corresponding to discharge capacities of RS45i / RS55i / RS75i |
| Initial pressure drop | Approx. 0.2–0.5 kPa (2–5 mbar) |
| Operating differential pressure range | Rises continuously from new to replacement point; no fixed value |
| Alarm / final resistance | Common setting 1.0–1.5 kPa (10–15 mbar); refer to machine panel setting |
| Pressure drop vs. energy consumption | For every 1 kPa increase in inlet resistance, shaft power increases by approx. 0.3%–0.5% at the same discharge volume |
Air filters should be replaced when they reach a certain point, not only when completely clogged. As differential pressure rises from 0.3 kPa to 1.2 kPa, the machine still runs, but electricity costs increase. 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 inlet box design; not marked on this page; refer to actual old part measurement |
| 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 inlet box seat, located by end-face seal; not threaded, not clamped |
| Sealing method | Soft sealing ring 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 inner diameter of sealing face. Matching these three numbers ensures correct fit.
3.4 Material Construction
| Component | Material | Notes |
|---|---|---|
| Filter media | Wood pulp fiber filter paper (resin-impregnated for reinforcement) | Standard inlet grade configuration |
| Media basis 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 sealing 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 inlet conditions, approx. −20 °C to +80 °C |
| Relative humidity | Can handle high-humidity inlet air; not suitable for continuous liquid water droplets |
| Burst strength / collapse pressure | Must withstand inlet 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 differential pressure, not fixed hours |
| Intermediate inspection | Recommended every 2000 hours or quarterly: check element surface and differential pressure |
| Shelf life | Unopened, stored dry and away from light; use within 3 years; moisture reduces media strength |
For continuous operation, follow hours; for intermittent operation or quarterly maintenance sites, follow calendar intervals—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 original parts standard |
| Filtration performance testing | References 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 |
ISO 2941 / 2942 / 2943 series commonly found in replacement part documentation are hydraulic filter standards; ISO 16889 multi-pass method is for liquid filtration. Neither applies to inlet air filters and should not be used as performance basis for procurement.
4. Standard Maintenance and Installation Steps
Step 1: Stop machine, disconnect power, release pressure Press stop button, disconnect main power and lock out. Wait for internal pressure to release. Inlet 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 differential pressure before replacement Before removal, read and record current inlet resistance from panel or differential pressure gauge. This is the only basis for judging early or late replacement; once removed, it's lost. Also record hour meter reading.
Step 3: Open inlet box, remove old element Loosen cover or clamping mechanism and remove old element. Keep element level during removal to prevent dust from falling into inlet chamber. Wipe inner walls and seat with clean cloth; dust on seat can cause poor sealing of new element.
Step 4: Inspect seat and sealing face Check three points: seat deformation, old seal ring residue on sealing face, and condition of cover clamping mechanism. Residual rubber ring on sealing face 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, sealing face position. Verify 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 fit, 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 machine, run unloaded for a few minutes. Listen for abnormal noise at inlet (whistling indicates leakage); check panel differential pressure returns to new element level (approx. 0.2–0.5 kPa). If pressure is high, first check installation; do not immediately suspect the element.
Step 8: Record Record hour meter reading, replacement date, old and new differential pressures, and part number in maintenance log. This line is more accurate than any manual for future interval decisions.
5. Frequently Asked Questions
Q1: What is the difference between 47557738001 and 24900318?
The former is the standard inlet filter element; the latter is the high-dust inlet filter element. Both fit the same position and look similar, but media and dust holding capacity differ. Standard element is for normal inlet environments; high-dust element is for sites with noticeably 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 inlet 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 differential pressure: 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 replacement guide in dusty environments.
Q4: Can I blow clean the element and reuse it?
Not recommended. Blowing compressed air from inside out loosens media fibers, distorts pleat spacing, and reduces 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: Differential pressure is high right after installation. Is it the element?
Check installation first. Residual old rubber ring on sealing face, uneven cover tightening, or element not fully seated can all cause high differential pressure. After ruling these out, suspect the element itself.
Q7: How to tell if the air filter or oil filter is clogged?
Check two readings: if inlet negative pressure (or air filter differential pressure) rises while discharge temperature remains 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 4000 hours also replace oil filter element 24900433; at 8000 hours also add oil separator element 23708423, return air filter 88089743, and two valve service kits. Replacing only the air filter is fine, but do not delay other components' intervals.
Q9: Why is there a big price difference for the same model air filter?
The difference mainly comes from media and construction: paper basis 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 machines, the price difference is usually offset by electricity and downtime costs.
Q10: Can it be used after long storage?
Under unopened, dry and dark conditions, use within 3 years. Moisture-affected media may look normal but strength is reduced; installation may lead to collapse under negative pressure and blockage of inlet.
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 inlet part number |
| RS45ne / RS55ne / RS75ne | Not compatible | Same as above |
| Other RS series (RS30, RS90 and above) | Not compatible | Different frame; inlet parts not interchangeable |
| High-dust configuration RS45i / RS55i / RS75i | Not compatible | Use 24900318 for this configuration |
Verification method: Check the full model on the machine nameplate (including suffix), then cross-reference the part number in the inlet section of parts manual 47612270. Both must match for this part.
7. Related Parts
The following are parts from the same RS45i / RS55i / RS75i family, related to the inlet side or the same maintenance interval:
| Part number | Name | Relation |
|---|---|---|
| 24900318 | High-dust air filter element | Upgrade for same position. Use this number for dusty 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 element (DRYER FILTER) | Only for units with refrigerated dryer configuration |
| 47784006001 | 4000h standard maintenance kit | Includes 1 pc this part + 1 pc oil filter element |
| 47784007001 | 4000h maintenance kit with dryer | Includes this part + oil filter element + dryer filter element |
| 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; please refer to the maintenance kit list in the machine's parts manual before ordering. Machines with and without refrigerated dryers have different 4000-hour kit numbers; do not mix them.