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 conditions; not for IE/NE suffixed units 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 air intake and before the compressor inlet valve. Ambient air passes through it before entering the compression chamber. If dust particles enter the compressor directly, they wear the rotor and casing clearance; once the clearance increases, pumping efficiency drops irreversibly. The air filter element is the barrier that prevents this.
For these 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, and installing the wrong one will not cause an immediate fault, but in dusty 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 model suffixes IE or NE. RS45i, RS45ie, and RS45ne are different configurations, and the 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 |
| Applicable Models | RS45i, RS55i, RS75i |
| Not Applicable | Units with IE / NE suffix; high-dust configuration units (use 24900318) |
| Installation Position | Between air intake and compressor 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 Indicators)
| 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 | Intake pre-filtration grade, characterized by efficiency and dust holding capacity; HVAC classification (G4 / F7 etc.) does not apply |
| Dust Holding Capacity | Commonly 200–400 g for similar parts; exact value per incoming inspection or manufacturer data |
| Cleanable / Reusable | Not recommended. After water washing, paper filter 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, but they are not acceptance criteria. For acceptance, check pressure drop.
3.2 Flow and Resistance Parameters
| Parameter | Value / Description |
|---|---|
| Rated Airflow | Varies by model, covering intake air volume corresponding to RS45i / RS55i / RS75i displacement |
| Initial Pressure Drop | Approx. 0.2–0.5 kPa (2–5 mbar) |
| Operating Pressure Differential | Rises continuously from new to replacement point; no fixed value |
| Alarm / Final Resistance | Commonly set at 1.0–1.5 kPa (10–15 mbar); refer to unit 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 the same discharge volume |
The air filter should be replaced when it reaches a certain pressure drop, not only when completely 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 power consumed by a 75 kW unit during the latter half of the filter's life often exceeds the cost of the filter itself.
3.3 Structural Dimensions and Installation Parameters
| Parameter | Value / Description |
|---|---|
| External Dimensions | Depends on intake 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 filter media and area design; count on actual part |
| Mounting Interface | Fits into intake box seat, located by end-face seal; not threaded, not clamp-type |
| Sealing Method | Soft sealing ring on end cap, compressed by housing |
| Installation Orientation | Oriented; sealing face toward seat, do not install reversed |
Before ordering, the easiest way is to remove the old element 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 intake grade configuration |
| Media Basis Weight | Commonly 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 sealing ring, or polyurethane foam end caps | Also serve as sealing carrier |
| Seal | Nitrile rubber (NBR) or polyurethane | Ensures no bypass between element and seat |
| Adhesive Layer | Hot melt adhesive or polyurethane adhesive | Fixes end caps to filter media |
3.5 Operating Condition Tolerance
| Parameter | Value / Description |
|---|---|
| Operating Temperature | Normal intake conditions, approx. −20 °C to +80 °C |
| Relative Humidity | Can withstand high-humidity intake; not suitable for continuous intake with liquid water droplets |
| Burst Strength / Collapse Pressure | Must withstand intake negative pressure after filter blockage without collapsing; specific value per manufacturer drawing |
| Special Functions | 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 drop, not fixed hours |
| Intermediate Inspection | Recommended every 2000 hours or quarterly: check filter surface and pressure drop |
| Shelf Life | Unopened, stored dry and away from light; recommended 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 Test | Refer to air filter test framework such as ISO 5011; specific test report not attached to this part number |
| Environmental / Material Compliance | Per documentation supplied with goods |
Replacement part documentation often references ISO 2941 / 2942 / 2943 series, which are hydraulic filter standards, and ISO 16889 multi-pass method 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 machine, disconnect power, release pressure Press stop button, disconnect main power and lock out. Wait for internal pressure to fully release. Intake side pressure is low, but residual pressure on compressor 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 pressure gauge. This is the only basis for judging early or late replacement; it is lost after removal. Also record hour meter reading.
Step 3: Open intake box, remove old element Loosen housing cover or clamping mechanism, remove old element. Keep element level during removal to prevent surface dust from falling into intake 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 surface Check three points: seat deformation, old seal residue on sealing surface, and condition of cover clamping mechanism. Residual old rubber ring on sealing surface is the most common cause of 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 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 only one side, as uneven force can 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 intake (whistling indicates leakage), 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 Enter hour meter reading, replacement date, old and new pressure drops, 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 element; the latter is the high-dust intake filter element. Both fit the same position and look similar, but filter media and dust holding capacity differ. The standard part is for normal intake environments; the high-dust part is for sites with significantly higher dust levels. 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 only corresponds to RS45i, RS55i, RS75i. Units with IE or NE suffix have 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; 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 filter media fibers, deform pleat spacing, and reduce dust holding capacity, often invisibly. Short-term savings may actually send dust into the compressor.
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 a filter problem?
Check installation first. Residual old rubber ring on sealing surface, uneven cover tightening, or element not fully seated can 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 readings: if intake negative pressure (or air filter pressure drop) increases while discharge temperature remains stable, 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 together with the air filter?
According to the maintenance pack structure, at the 4000-hour interval also replace oil filter element 24900433; at 8000 hours also add oil separator element 23708423, return air filter 88089743, and two valve service packs. Replacing only the air filter 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 filter 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 easier collapse when damp. For continuously running compressors, 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, recommended use within 3 years. Moisture-exposed media may look normal but strength has decreased, and it may collapse under negative pressure and block intake after installation.
6. Compatible Models
| Model | Applicability | Notes |
|---|---|---|
| RS45i | Applicable | Part number listed in parts manual and price list |
| RS55i | Applicable | Same as above |
| RS75i | Applicable | Same as above |
| RS45ie / RS55ie / RS75ie | Not applicable | Different model suffix; intake part number differs |
| RS45ne / RS55ne / RS75ne | Not applicable | Same as above |
| Other RS series (RS30, RS90 and above) | Not applicable | Different frame; intake parts not interchangeable |
| High-dust configuration RS45i / RS55i / RS75i | Not applicable | Use 24900318 for this configuration |
Verification method: Check the full model on the unit nameplate (including suffix), then compare part number in the intake 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 intake side or the same maintenance interval:
| Part Number | Name | Relationship |
|---|---|---|
| 24900318 | High-Dust Air Filter Element | Upgrade part for same position. Use this number in dusty 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) | Used only on units with refrigerated dryer configuration |
| 47784006001 | 4000h Standard Maintenance Pack | Includes 1 × this part + 1 × oil filter element |
| 47784007001 | 4000h Maintenance Pack with Dryer | Includes this part + oil filter element + dryer filter element |
| 47784008001 | 8000h Standard Maintenance Pack | Includes this part + oil filter + oil separator + return air filter + two valve service packs |
Maintenance packs are tiered by unit configuration; before ordering, refer to the maintenance pack list in the unit's parts manual. Units with and without refrigerated dryers have different 4000-hour pack numbers; do not mix them.