Product
Ingersoll Rand 47557738001 Standard Air Filter | RS45i/55i/75i
Ingersoll Rand 47557738001 standard air filter element for RS45i, RS55i and RS75i screw compressors. 4000-hour service interval under standard intake 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 located after the machine intake and before the main intake valve. Ambient air passes through it before entering the compression chamber. If dust particles enter the airend directly, they wear the rotor and housing clearances; once the clearance increases, pumping efficiency drops and the loss is irreversible. The air filter element is the barrier that protects this critical point.
For these three models, two intake-side configurations exist: 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 dusty sites the standard element will clog prematurely and the replacement interval will be noticeably shorter. 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 intake 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 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 for those) |
| Installation Location | Between intake and main intake 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% (standard test dust, rated airflow) |
| Filter Class | Intake pre-filtration grade, characterized by efficiency and dust holding capacity; HVAC classification (G4 / F7 etc.) does not apply |
| 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 correct grade was purchased; they are not suitable as acceptance criteria. For acceptance, use differential pressure.
3.2 Flow and Resistance Parameters
| Parameter | Value / Description |
|---|---|
| Rated Airflow | Varies by model; covers intake air volume corresponding to RS45i / RS55i / RS75i displacement |
| Initial Pressure Drop | Approx. 0.2–0.5 kPa (2–5 mbar) |
| Operating Differential Pressure 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 machine panel settings |
| Pressure Drop vs. Energy Consumption | For every 1 kPa increase in intake resistance, shaft power increases by approx. 0.3%–0.5% at constant discharge volume |
Air filters should be replaced when they reach a certain point, not only when completely clogged. When differential pressure 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 | Depend on intake housing 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 physical count |
| Mounting Interface | Fits into intake housing seat, located by end-face seal; not threaded, not clamped |
| Sealing Method | Soft gasket on end cap, formed by housing compression |
| Installation Orientation | Directional; sealing face toward seat, do not install reversed |
Before ordering, remove the old element and measure three points: outer diameter, overall height, and seal face inner diameter. Matching these three numbers will basically ensure correct fit.
3.4 Material Construction
| Component | Material | Description |
|---|---|---|
| Filter Media | Wood pulp fiber filter paper (resin-impregnated for reinforcement) | Standard intake grade configuration |
| Media Basis Weight | Typically 120–160 g/m² for similar parts | Basis 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 gasket, or polyurethane foam end caps | Also serve as seal carrier |
| Seal | Nitrile rubber (NBR) or polyurethane | Ensures no bypass between element and seat |
| Adhesive | Hot melt or polyurethane adhesive | Bonds 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 does not have oil-resistant, water-resistant, 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 differential pressure, not fixed hours |
| Intermediate Inspection | Recommended every 2000 hours or quarterly: check filter surface and differential pressure |
| Shelf Life | Unopened, stored dry and away from light; use within 3 years. Media strength decreases after moisture exposure |
For continuous operation, base replacement on hours; for intermittent operation or quarterly maintenance sites, use calendar intervals, whichever comes first. Some domestic channels state approximately 2000 hours; this figure is conservative and can be used as an early replacement margin in dusty environments.
3.7 Standards
| Item | Description |
|---|---|
| Manufacturer Standard | Ingersoll Rand original part standard |
| Filtration Performance Testing | References air filter test frameworks such as ISO 5011; no specific test report is attached to this part number |
| Environmental / Material Compliance | Per documentation supplied with goods |
ISO 2941 / 2942 / 2943 series commonly seen in replacement part documentation are hydraulic filter standards, and ISO 16889 multi-pass method is for liquid filtration; none 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, relieve pressure Press the stop button, disconnect main power and lock out/tag out, wait for internal pressure to fully relieve. Intake side pressure is low, but residual pressure on the airend side can cause the rotor to be turned by airflow during disassembly. Wait until the pressure gauge reads zero before proceeding.
Step 2: Record differential pressure before replacement Before removal, read and record the current intake resistance from the panel or differential pressure gauge. This number is the only basis for judging whether replacement is early or late; it is lost after removal. Also note the hour meter reading.
Step 3: Open intake housing, remove old element Loosen the housing cover or clamping mechanism and remove the old element. Keep the element level during removal to prevent surface dust from falling into the intake chamber. Wipe the housing interior and seat with a clean cloth; dust on the seat will prevent proper sealing of the new element.
Step 4: Inspect seat and sealing surface Check three points: seat deformation, old gasket residue on sealing surface, and condition of cover clamping mechanism. Residual old gasket on the sealing surface is the most common cause of leakage; the new element may appear seated but is actually pressing on a ring of old rubber.
Step 5: Verify new part Compare new element with old side by side: outer diameter, overall height, seal face position. Also check the part number on the housing is 47557738001. If the site is a high-dust configuration, this step will reveal the issue — high-dust machines require 24900318.
Step 6: Install new element With sealing face toward seat, insert vertically; do not tilt. After seating, press the outer ring by hand to confirm contact, then install cover. Tighten evenly; do not tighten bolts on one side only, as uneven force on the sealing surface will leave gaps.
Step 7: Restore and test run Restore power, start the machine, run unloaded for a few minutes. Listen for abnormal noise at intake (leaks cause whistling), check panel differential pressure returns to new-element level (approx. 0.2–0.5 kPa). If pressure drop is high, first check installation; do not immediately blame the element.
Step 8: Record Write hour meter reading, replacement date, old and new differential pressures, and part number in the 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 intake filter element, the latter is the high-dust intake filter element. Both fit the same location and look similar, but media and dust holding capacity differ. The standard part is for normal intake environments; the high-dust part is for sites with notably high dust. Installing the wrong one will not cause immediate failure, but the service interval will be noticeably off.
Q2: My machine is RS45ie. Can I use this?
No. This part number corresponds only to RS45i, RS55i, RS75i. Units with IE or NE suffixes use 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; use differential pressure: replace at 1.0–1.5 kPa (per panel setting). Some domestic channels state 2000 hours; this is conservative and can serve as an early margin in dusty environments.
Q4: Can I blow the element clean and reuse it?
Not recommended. Blowing compressed air from inside out loosens media fibers and deforms pleat spacing, reducing dust holding capacity, often invisibly. Short-term savings may actually send dust into the airend.
Q5: Can it be washed with water?
No. Wood pulp fiber paper loses fiber bonding when wet; after drying, both strength and efficiency degrade.
Q6: The pressure drop is high right after installation. Is it the element?
Check installation first. Residual old gasket on sealing surface, uneven cover tightening, or incomplete seating can all cause high pressure drop. Only after ruling out these three should you suspect the element itself.
Q7: How to tell if the air filter or oil filter is clogged?
Read two values: if intake negative pressure (or air filter differential pressure) 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, the 4000-hour interval also replaces oil filter element 24900433; at 8000 hours, also replace oil separator element 23708423, return air filter 88089743, and two valve service kits. Replacing only the air filter is of course possible, but do not delay the intervals of other parts.
Q9: Why is there a big price difference for the same model air filter?
The difference mainly comes from media and workmanship: 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, 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. Media that has absorbed moisture may look normal but strength has decreased; it may collapse under negative pressure and block intake after installation.
6. Compatible Models
| Model | Compatibility | Notes |
|---|---|---|
| RS45i | Compatible | Listed in parts manual and price list |
| RS55i | Compatible | As above |
| RS75i | Compatible | As above |
| RS45ie / RS55ie / RS75ie | Not compatible | Different model suffix, different intake part number |
| RS45ne / RS55ne / RS75ne | Not compatible | 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 this configuration |
Verification method: check the full model (including suffix) on the machine nameplate, then compare the part number in the 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 the intake side or the same maintenance interval:
| Part Number | Name | Relationship |
|---|---|---|
| 24900318 | High-Dust Air Filter Element | Upgrade at same location. Use this number for high-dust 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 × this part + 1 × 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; before purchasing, refer to the maintenance kit list in the machine's parts manual. Units with and without refrigerated dryers have different 4000-hour kit numbers; do not mix them.