Product
Ingersoll Rand 47557738001 Standard Air Filter | RS45i/RS55i/RS75i
Ingersoll Rand 47557738001 standard air intake filter for 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 compressor intake 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 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 high-dust sites 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 the intake part numbers 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 |
| Compatible Models | RS45i, RS55i, RS75i |
| Incompatible Models | Units with IE / NE suffix; high-dust configuration units (use 24900318) |
| Installation Location | Between intake 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 captures particles above 10 μm |
| Filtration Efficiency | ≥99% (standard test dust, rated airflow) |
| Filter Class | Intake pre-filter grade, characterized by efficiency and dust holding capacity; not classified under ventilation/air conditioning systems (G4 / F7, etc.) |
| Dust Holding Capacity | Common range for similar parts: 200–400 g; exact value per incoming inspection or manufacturer data |
| Cleanable / Reusable | Not recommended. Paper filter media fibers collapse after water washing, reducing both dust holding capacity and efficiency |
These figures are suitable for judging whether to replace and whether the correct grade was purchased, 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); refer to unit panel setting |
| 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 filters should be replaced when they reach a certain pressure drop, not only when completely clogged. When 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 second half of the filter's life often exceeds the cost of the filter itself.
3.3 Structural Dimensions and Installation Parameters
| Parameter | Value / Description |
|---|---|
| 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 / Pleat Spacing | Depends on 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 box compression |
| Installation Orientation | Front and back sides; 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 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 Caps | Metal end caps with soft sealing ring, or polyurethane foam end caps | Also serves as seal carrier |
| Sealing Element | Nitrile rubber (NBR) or polyurethane | Ensures no bypass between filter and seat |
| Adhesive Layer | Hot melt adhesive or polyurethane adhesive | Bonds end caps 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 collapse; specific value per manufacturer drawing |
| Special Functions | None. Standard type does not have oil-proof, water-proof, or flame-retardant treatments |
3.6 Lifetime 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, store in dry, dark conditions; use within 3 years. Moisture reduces media strength |
For continuous operation, base replacement on hours; for intermittent operation or quarterly maintenance, 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 genuine parts standard |
| Filtration Performance Test | Refer to air filter test framework such as ISO 5011; no specific test report attached to this part number |
| 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 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. Wait for internal pressure to fully relieve. Intake pressure is low, but residual pressure on the main unit side may cause the rotor to be driven by airflow during disassembly. Wait until pressure gauge reads zero before proceeding.
Step 2: Record pressure drop before replacement Before removal, read and record the current intake resistance from the panel or pressure differential gauge. This value is the only basis for judging early or late replacement; it is lost after removal. Also record the hour meter reading.
Step 3: Open intake box, remove old filter Loosen the box cover or clamping mechanism and remove the old filter. Keep the filter level during removal to prevent surface dust from falling into the intake chamber. Wipe the inside of the box and the seat with a clean cloth; dust on the seat can cause poor sealing of the 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 the sealing surface is the most common cause of air leaks; the new filter may appear seated but is actually pressing on a ring of old rubber.
Step 5: Verify new part Compare new filter with old part side by side: outer diameter, overall height, sealing face position. Also check the part number on the box is 47557738001. If the site is high-dust configuration, this step will reveal the issue—high-dust models require 24900318.
Step 6: Install new filter With sealing face toward seat, insert vertically; do not tilt. After seating, press the outer ring by hand to confirm fit, then install cover. Tighten evenly; do not tighten only one side, as uneven force on the sealing surface can 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 leak), check panel pressure drop returns to new-part level (approx. 0.2–0.5 kPa). If pressure drop is high, first check installation, not the filter itself.
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 determining the next interval.
5. FAQ
Q1: What is the difference between 47557738001 and 24900318?
The former is the standard intake filter, the latter is the high-dust intake filter. Both fit the same location and look similar, but the filter media and dust holding capacity differ. The standard part is for normal intake 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, RS75i. Units with IE or NE suffixes have different intake part numbers. Before buying, read the full model on the nameplate, 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 trigger 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 and deform pleat spacing, reducing dust holding capacity, and the damage is invisible. Short-term savings often result in dust entering 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 the filter at fault?
Check installation first. Residual old rubber ring on sealing surface, uneven cover tightening, or filter not fully seated can all cause high pressure drop. After ruling out these three, suspect the filter itself.
Q7: How to tell if the 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; a clogged oil filter usually accompanies oil pressure changes and rising discharge temperature. Reading both values together is more accurate than one alone.
Q8: What else should be replaced together 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 the air filter alone is fine, but do not delay other parts beyond their intervals.
Q9: Why is there a big price difference for the same model air filter?
Price differences mainly come 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 and downtime costs.
Q10: Can a filter stored for a long time still be used?
Under unopened, dry, dark storage conditions, use within 3 years. Moisture-affected media may look normal but strength has decreased; it may collapse under negative pressure and block intake after installation.
6. Compatible Models
| Model | Compatible | Notes |
|---|---|---|
| RS45i | Yes | Listed in parts manual and price list |
| RS55i | Yes | Same as above |
| RS75i | Yes | Same as above |
| RS45ie / RS55ie / RS75ie | No | Different model suffix, different intake part number |
| RS45ne / RS55ne / RS75ne | No | Same as above |
| Other RS series (RS30, RS90 and above) | No | Different frame, intake parts not interchangeable |
| High-dust configuration RS45i / RS55i / RS75i | No | Use 24900318 for this configuration |
Verification method: Check the full model (including suffix) on the unit nameplate, then compare the part number in the intake section of parts manual 47612270. Both must match for this part to be correct.
7. Related Parts
The following parts are in the same family as RS45i / RS55i / RS75i and related to the intake side or the same maintenance interval:
| Part Number | Name | Relationship |
|---|---|---|
| 24900318 | High-Dust Air Filter | Upgrade part for same location. Use in high-dust sites |
| 24900433 | Oil Filter (FILTER, COOLANT) | Same 4000-hour maintenance interval, replace together 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 (DRYER FILTER) | Only for units with refrigerated dryer configuration |
| 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. Before purchasing, 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.