Product
Ingersoll Rand 47557738001 Air Filter Element | RS45i/55i/75i
Standard air intake filter element for Ingersoll Rand RS45i, RS55i, and RS75i screw compressors. 4000-hour service interval under standard conditions. Not for IE/NE suffix models 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 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 will 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 intake 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 dusty sites, 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 IE or NE suffix in the model. 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 filter consumable, complete replacement |
| Compatible Models | RS45i, RS55i, RS75i |
| Incompatible Models | 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 drop |
3. Technical Specifications
3.1 Filtration Performance Parameters (Core Indicators)
| Parameter | Value / Description |
|---|---|
| Filtration Rating | Approx. 3–10 μm, primarily capturing 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; not based on ventilation/air conditioning classification (G4 / F7 etc.) |
| Dust Holding Capacity | Common range for similar parts: 200–400 g; exact value subject to incoming inspection or manufacturer data |
| Washable / Reusable | Not recommended. Paper filter media fibers collapse after washing, reducing both dust holding capacity and efficiency |
These figures are useful for judging whether to replace or if the wrong grade was purchased, but not as 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 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 intake resistance, shaft power increases by approx. 0.3%–0.5% at the same discharge volume |
Air filter elements should be replaced when they reach 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 costs are already higher. 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 price of the filter itself.
3.3 Structural Dimensions and Installation Parameters
| Parameter | Value / Description |
|---|---|
| Overall Dimensions | Depends on intake box design; not specified on this page; measure old part for reference |
| Effective Filtration Area | Typically 1.5–4 m² for similar parts |
| Pleat Count / Pleat Spacing | Depends on filter media and area design; count on actual part |
| Mounting Interface | Fits into intake box seat, positioned by end-face seal; not threaded, not clamped |
| Sealing Method | Soft sealing ring on end cap, formed by compression from housing |
| Installation Orientation | Oriented; sealing face toward seat, do not install backwards |
Before ordering, it is easiest to remove the old part and measure three dimensions: outer diameter, overall height, and seal 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 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 Cap | Metal end cap with soft sealing ring, or polyurethane foam end cap | Also serves as seal carrier |
| Seal | Nitrile rubber (NBR) or polyurethane | Ensures no bypass between element and seat |
| Adhesive Layer | Hot melt adhesive or polyurethane adhesive | Bonds end cap to filter media |
3.5 Operating Condition Tolerance Parameters
| Parameter | Value / Description |
|---|---|
| Operating Temperature | Normal intake conditions, approx. −20 °C to +80 °C |
| Relative Humidity | Can withstand high-humidity intake; not suitable for intake with continuous liquid water droplets |
| Burst Strength / Collapse Pressure | Must withstand intake negative pressure after filter 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 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, use hours as primary; for intermittent operation or quarterly maintenance sites, use calendar intervals, whichever comes first. Some domestic channels state approximately 2000 hours; this is conservative and can be used as an early replacement trigger in dusty environments.
3.7 Standards
| Item | Description |
|---|---|
| Manufacturer Standard | Ingersoll Rand original parts standard |
| Filtration Performance Testing | Referenced to 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 parts documentation often cites 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, relieve pressure Press stop button, disconnect main power and lock out/tag out, wait for internal pressure to fully release. Intake 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 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; once removed, it's gone. Also record hour meter reading.
Step 3: Open intake box, remove old element Loosen box 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 ring 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 element may seem properly 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 box 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 fit, then install cover. Tighten evenly; do not tighten only one side, as uneven force on sealing surface may leave gaps.
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 Record 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. Frequently Asked Questions
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 install in the same position and look similar, but filter media and dust holding capacity differ. Standard element is for normal intake environments; high-dust element is for sites with significantly high dust. Installing wrong will not cause immediate fault, but 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 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 (subject to panel setting). Some domestic channels state 2000 hours; this is conservative and can be used as an early replacement trigger in dusty environments.
Q4: Can I blow clean the element and reuse?
Not recommended. Blowing compressed air from inside out will loosen filter media fibers and deform pleat spacing, reducing dust holding capacity, and it is not visible to the eye. 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 drop is high right after installation. Is it the element?
Check installation first. Residual old rubber ring on sealing surface, uneven cover tightening, 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 air filter or oil filter is clogged?
Check two values: if intake negative pressure (or air filter pressure drop) rises while discharge temperature changes little, it is likely the air filter; if oil filter is clogged, oil pressure change and discharge temperature rise usually accompany. Reading both together is more accurate than one alone.
Q8: What else should be replaced along with air filter?
According to 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 air filter alone is fine, but do not delay other parts' intervals.
Q9: Why is there a big price difference for same model air filters?
Price difference mainly comes from filter 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 costs and downtime.
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, and 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 | Same as above |
| RS75i | Compatible | Same as above |
| RS45ie / RS55ie / RS75ie | Not compatible | Different model suffix, different intake part number |
| RS45ne / RS55ne / RS75ne | Not compatible | Same 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 | Should use 24900318 for this configuration |
Verification method: Check full model on unit nameplate (including suffix), then compare part number in intake section of parts manual 47612270. Both must match for this part.
7. Related Parts
The following are parts from the same family as RS45i / RS55i / RS75i, related to intake side or same maintenance interval:
| Part Number | Name | Relationship |
|---|---|---|
| 24900318 | High-dust air filter element | Upgrade part for same position. Use this number for 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 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 unit configuration; please refer to the maintenance kit list in the unit's parts manual before ordering. Units with and without refrigerated dryer have different 4000-hour kit numbers; do not mix them.