Product
Ingersoll Rand 47557738001 Standard Air Filter | RS45i/RS55i/RS75i
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 compressor 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 housing clearance; as 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 a different 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 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, 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 |
| Compatible Models | RS45i, RS55i, RS75i |
| Incompatible Models | Units with IE / NE suffix; high-dust configuration units (use 24900318) |
| Installation Location | Between inlet 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 intercepting 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 comparable to HVAC classification (G4 / F7 etc.) |
| Dust Holding Capacity | Typically 200–400 g for similar parts; precise value per incoming inspection or manufacturer data |
| Cleanable / Reusable | Not recommended. Paper media fibers collapse after washing, reducing both dust holding capacity and efficiency |
These figures help determine whether to replace and whether the correct grade was purchased; they are not suitable as acceptance criteria. For acceptance, check pressure drop.
3.2 Flow and Resistance Parameters
| Parameter | Value / Description |
|---|---|
| Rated Airflow | Varies by model; covers inlet air volume corresponding to RS45i / RS55i / RS75i displacement |
| 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 | Typical setting 1.0–1.5 kPa (10–15 mbar), subject to unit panel settings |
| Pressure Drop vs. Energy Consumption | Each 1 kPa increase in inlet resistance raises shaft power by approx. 0.3%–0.5% at constant discharge |
Air filters should be replaced not only when clogged, but when they reach a certain point. 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, a 75 kW unit will often consume more extra electricity during the second half of the filter's life than the filter itself costs.
3.3 Dimensions and Installation Parameters
| Parameter | Value / Description |
|---|---|
| Overall Dimensions | Depends on inlet 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 media and area design; verify by physical count |
| Mounting Interface | Fits into inlet housing seat, positioned by end-face seal; not threaded, not clamped |
| Sealing Method | Soft sealing ring on end cap, formed by housing compression |
| Installation Orientation | Oriented; sealing face toward seat, do not install reversed |
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 filter paper (resin-impregnated for reinforcement) | Standard inlet grade configuration |
| 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 sealing ring, or polyurethane foam end caps | Also serve as sealing carrier |
| Seal | Nitrile rubber (NBR) or polyurethane | Ensures no bypass at seat |
| Adhesive | Hot melt adhesive or polyurethane adhesive | Fixes 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 | Withstands 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 drawings |
| Special Functions | None. Standard type does not have oil-proof, waterproof, 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; determine by pressure drop, not by hours alone |
| Intermediate Inspection | Recommended every 2000 hours or quarterly: check filter surface and pressure drop |
| 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 approx. 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 Testing | Referenced to air filter test frameworks 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, which are hydraulic filter standards, and ISO 16889 multi-pass method for liquid filtration; these do not apply to inlet air filters and should not be used as performance criteria for procurement.
4. Standard Maintenance and Installation Steps
Step 1: Stop machine, 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 the main unit side may cause rotor movement during disassembly. Wait until pressure gauge reads zero before proceeding.
Step 2: Record pressure drop before replacement Before removal, read and record current inlet resistance from panel or differential pressure gauge. This value is the only basis for judging whether replacement is early or late; once removed, it is lost. Also record hour meter reading.
Step 3: Open inlet 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 inlet chamber. Wipe housing interior and seat with a 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 O-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. 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 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 bolts on one side only, as uneven force may leave gaps in sealing surface.
Step 7: Restore and test run Restore power, start unit, run unloaded for a few minutes. Listen for abnormal noise at inlet (leaks cause whistling), 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 the element.
Step 8: Record Write hour meter reading, replacement date, old and new pressure drop, 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 inlet air filter, the latter is the high-dust inlet air filter. They install in the same location and look similar, but media and dust holding capacity differ. The standard part is for normal inlet environments; the high-dust part is for sites with significantly high dust. Installing the wrong one will not cause immediate failure, but the service interval will be noticeably incorrect.
Q2: My machine is RS45ie; can I use this?
No. This part number corresponds only to RS45i, RS55i, and RS75i. Units with IE or NE suffixes use different inlet part numbers. Read the full model on the nameplate before purchasing; do not rely only on the leading numbers.
Q3: How many hours before replacement?
4000 hours under standard conditions. In dusty sites, do not rely solely 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 used as an early replacement guide in dusty environments.
Q4: Can I blow the filter with compressed air and reuse it?
Not recommended. Blowing compressed air from inside out will loosen media fibers, deform pleat spacing, and reduce dust holding capacity, often invisibly. 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, both strength and efficiency degrade.
Q6: Pressure drop is high right after installation; is it the filter's fault?
Check installation first. Residual old O-ring on sealing surface, uneven cover clamping, or element not fully seated can all cause high pressure drop. After ruling out these three, then suspect the element itself.
Q7: How to tell if the air filter or oil filter is clogged?
Check two values: if inlet negative pressure (or air filter pressure drop) rises while discharge temperature changes little, 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 together with the air filter?
Per 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 the air filter alone is acceptable, but do not delay other parts beyond their 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, support 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 easier collapse when damp. For continuously running units, this price difference is often offset by electricity and downtime costs.
Q10: Can it be used after long storage?
Unopened, stored dry and away from light, use within 3 years. Moisture-affected media may look normal but strength has decreased; 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 unit nameplate (including suffix), then compare part number in the inlet section of parts manual 47612270. Both must match for this part to be correct.
7. Related Parts
The following are parts in the same family for RS45i / RS55i / RS75i, related to the inlet side or the 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 Element (FILTER, COOLANT) | Same 4000-hour maintenance interval; replace together 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× this part + 1× oil filter element |
| 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 ordering, refer to the maintenance kit list in the unit's parts manual. Units with and without refrigerated dryers have different 4000-hour kit numbers; do not mix them.