Product
Ingersoll Rand 47557738001 Standard Air Filter for RS45i/55i/75i
Standard inlet air filter element for Ingersoll Rand RS45i, RS55i, and RS75i 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 inlet air 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 air inlet and before the main intake 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 irreversibly. The air filter element guards this critical point.
For these three models, there are two inlet configurations: 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 cause an immediate fault, but in high-dust environments, the standard element will clog prematurely, significantly shortening the replacement interval. Always check the site conditions before deciding on the part number.
Another common pitfall: this part number does not apply to units with model suffixes IE or NE. RS45i and RS45ie/RS45ne are different configurations, and the inlet 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 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 air inlet 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 capturing particles above 10 μm |
| Filtration Efficiency | ≥99% (under standard test dust and rated airflow) |
| Filter Class | Inlet pre-filtration grade, characterized by efficiency and dust holding capacity; not to be confused with HVAC classification (G4 / F7, etc.) |
| Dust Holding Capacity | Common range for similar parts: 200–400 g; exact value subject to incoming inspection or manufacturer data |
| Cleanable / Reusable | Not recommended. After water washing, paper media fibers collapse, reducing both dust holding capacity and efficiency |
These figures are useful for judging whether to replace and whether the correct grade was purchased; they are not suitable as acceptance criteria. For acceptance, check the pressure differential.
3.2 Flow and Resistance Parameters
| Parameter | Value / Description |
|---|---|
| Rated Airflow | Varies by model; covers inlet airflow corresponding to RS45i / RS55i / RS75i displacements |
| 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 | Common setting 1.0–1.5 kPa (10–15 mbar), subject to unit panel settings |
| Pressure Drop vs. Energy Consumption | For every 1 kPa increase in inlet resistance, shaft power increases by approx. 0.3%–0.5% at constant discharge |
Air filters should not be replaced only when clogged; they should be replaced when they reach a certain point. When 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 price of the filter itself.
3.3 Dimensions and Installation Parameters
| Parameter | Value / Description |
|---|---|
| Dimensions | Depends on inlet box design; not marked on this page; measure the 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 the actual part |
| Mounting Interface | Fits into inlet box seat, positioned by end-face seal; not threaded, not clamped |
| Sealing Method | Soft sealing ring on end cap, compressed by housing |
| Installation Orientation | Has front and back; sealing face toward seat; do not install reversed |
Before ordering, remove the old part and measure three dimensions: outer diameter, overall height, and sealing face inner diameter. Matching these three numbers ensures correct fit.
3.4 Material Composition
| Component | Material | Description |
|---|---|---|
| Filter Media | Wood pulp fiber filter paper (resin impregnated for reinforcement) | Standard inlet grade configuration |
| 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 sealing ring, or polyurethane foam end caps | Also serves as sealing carrier |
| Seal | Nitrile rubber (NBR) or polyurethane | Ensures no bypass at seat |
| Adhesive | Hot melt glue 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 collapsing; specific value per manufacturer drawings |
| Special Features | None. Standard type does not have 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 differential, not by fixed hours |
| Intermediate Inspection | Recommended every 2000 hours or quarterly: check filter surface and pressure differential |
| Shelf Life | Unopened, stored dry and away from light; use within 3 years recommended; moisture reduces media strength |
For continuous operation, base replacement on hours; for intermittent operation or quarterly maintenance, follow calendar intervals, whichever comes first. Some domestic channels state approximately 2000 hours; this is conservative and can be used as an early replacement guide in dusty environments.
3.7 Standards
| Item | Description |
|---|---|
| Manufacturer Standard | Ingersoll Rand genuine parts standard |
| Filtration Performance Test | References air filter test framework such as ISO 5011; no specific test report attached to this part number |
| Environmental / Material Compliance | Subject to documentation supplied with goods |
Replacement part documentation often cites ISO 2941 / 2942 / 2943 series, which are hydraulic filter standards, and ISO 16889 multi-pass method 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, disconnect power, relieve pressure Press stop button, disconnect main power and lock out/tag out, wait for internal pressure to fully 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 pressure differential before replacement Before removal, read and record current inlet resistance from panel or differential 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 filter Loosen cover or clamping mechanism, remove old filter. Keep filter level during removal to prevent surface dust from falling into inlet chamber. Wipe inner walls and seat with clean cloth; dust on seat can cause poor sealing of new filter.
Step 4: Inspect seat and sealing surface Check three points: seat deformation, old seal 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 filter may seem seated but is actually pressing on old rubber.
Step 5: Verify new part Compare new filter 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 models require 24900318.
Step 6: Install new filter Sealing face toward seat, insert vertically, do not tilt. After seating, press outer ring to confirm fit, then install cover. Tighten evenly, do not tighten only one side, otherwise uneven pressure may leave gaps.
Step 7: Restore and test run Restore power, start unit, run unloaded for a few minutes. Listen for abnormal noise at inlet (whistling indicates leakage), check panel pressure differential returns to new filter level (approx. 0.2–0.5 kPa). If differential is high, first check installation, do not immediately blame filter.
Step 8: Record Record hour meter reading, replacement date, old and new pressure differentials, and part number in maintenance log. This line is more accurate than any manual for determining next interval.
5. FAQ
Q1: What is the difference between 47557738001 and 24900318?
The former is the standard inlet filter, the latter is the high-dust inlet filter. Both fit the same position and look similar, but media and dust holding capacity differ. Standard is for normal inlet environments; high-dust is for sites with significantly higher 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 use different inlet part numbers. Read the full model on the nameplate before purchasing, not just the leading numbers.
Q3: How often should it be replaced?
Under standard conditions, every 4000 hours. 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 replacement guide in dusty environments.
Q4: Can the filter be blown out and reused?
Not recommended. Blowing compressed air from inside out will loosen media fibers and deform pleat spacing, reducing dust holding capacity, and it 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 filter 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 fault?
Check installation first. Residual old rubber ring on sealing surface, uneven cover tightening, or filter not fully seated can all cause high differential. After ruling out these three, then suspect the filter 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) rises while discharge temperature changes little, it is likely the air filter; a clogged oil filter usually accompanies 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 24900433; at 8000 hours also add oil separator 23708423, return air filter 88089743, and two valve service kits. Replacing only the air filter is fine, but do not delay other parts' intervals.
Q9: Why is there a big price difference for the same model air filter?
The 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, and dark conditions, use within 3 years. Moisture-affected media may look normal but strength has decreased; installation may cause collapse under negative pressure and block 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 unit nameplate (including suffix), then compare part numbers in the inlet 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 the inlet side or same maintenance interval:
| Part Number | Name | Relationship |
|---|---|---|
| 24900318 | High-Dust Air Filter | Upgrade for same position. Use this for high-dust sites |
| 24900433 | Oil Filter (FILTER, COOLANT) | Same 4000-hour maintenance interval, replace with air filter |
| 23708423 | Oil Separator | Added at 8000-hour interval |
| 88089743 | Return Air Filter (.25 INCH BSPT) | Added at 8000-hour interval |
| 24242398 | Dryer Filter | Only for units with refrigerated dryer |
| 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; please refer to the parts manual supplied with the unit for kit lists. Units with and without refrigerated dryers have different 4000-hour kit numbers; do not mix.