Product
Ingersoll Rand 47557738001 Standard Air Filter | RS45i/RS55i/RS75i
Standard air filter element for Ingersoll Rand RS45i, RS55i, and RS75i screw compressors. Replace at 4,000 hours under standard conditions. Not for IE/NE suffix models or high-dust configurations (use 24900318). Order by part number.
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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 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's role is to guard 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 high-dust environments, the standard element will clog prematurely and the replacement interval will be significantly shortened. When purchasing, first assess the site conditions, then determine 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 | Models with IE / NE suffix; high-dust configuration units (use 24900318) |
| Installation Position | Between air intake and main intake valve |
| Replacement Interval | 4,000 hours under standard conditions; earlier based on pressure drop in dusty environments |
3. Technical Specifications
3.1 Filtration Performance (Core Indicators)
| Parameter | Value / Description |
|---|---|
| Filtration Rating | Approx. 3–10 μm, primarily capturing particles above 10 μm |
| Filtration Efficiency | ≥99% (under standard test dust, rated airflow) |
| Filter Class | Intake pre-filtration grade, characterized by efficiency and dust holding capacity; not classified under ventilation/AC standards (G4 / F7 etc.) |
| Dust Holding Capacity | Typical range 200–400 g for similar parts; exact value subject to incoming inspection or manufacturer data |
| Cleanable / Reusable | Not recommended. Paper media fibers collapse after washing, reducing both dust holding capacity and efficiency |
These figures are useful for determining whether to replace and whether the correct grade was purchased, but 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, 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 | 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 | 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 not be replaced only when clogged; they should be replaced when they reach a certain point. As pressure drop rises from 0.3 kPa to 1.2 kPa, the machine still runs, but electricity costs are already higher. Estimated at 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 |
|---|---|
| Dimensions | Depends on intake box design; not marked on this page; refer to actual old part measurement |
| Effective Filtration Area | Typically 1.5–4 m² for similar parts |
| Pleat Count / Pitch | Depends on filter media and area design; verify by physical count |
| Mounting Interface | Fits into intake box seat, positioned by end-face seal; not threaded, not clamped |
| Sealing Method | Soft gasket on end cap, formed by compression from housing |
| Installation Orientation | Front and back sides; sealing surface faces seat, do not install reversed |
Before ordering, the easiest way is to remove the old part and measure three dimensions: outer diameter, overall height, and seal 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 gasket, or polyurethane foam end cap | Serves as seal carrier |
| Seal | Nitrile rubber (NBR) or polyurethane | Ensures no bypass between seat and filter |
| Adhesive | Hot melt adhesive or polyurethane adhesive | Bonds end cap to 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 liquid water droplets |
| Burst / Collapse Pressure | Must withstand intake negative pressure after filter clogging without collapse; specific value per manufacturer drawings |
| Special Features | 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 | 4,000 hours (standard conditions) |
| Interval in Dusty Environments | Significantly shorter; judge by pressure drop, not by hours alone |
| Intermediate Inspection | Inspect filter surface and pressure drop every 2,000 hours or quarterly |
| Shelf Life | Unopened, stored in dry, dark conditions; use within 3 years. Media strength decreases after moisture exposure |
For continuous operation, use hours as the primary basis; for intermittent operation or quarterly maintenance sites, use calendar intervals, whichever comes first. Some domestic channels state approximately 2,000 hours; this figure 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 | References air filter test framework such as ISO 5011; this part number does not include a specific test report |
| Environmental / Material Compliance | Subject to documentation supplied with goods |
ISO 2941 / 2942 / 2943 series commonly found in replacement part documentation are hydraulic filter standards; ISO 16889 multi-pass method is for liquid filtration. Neither applies to intake 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 the stop button, disconnect main power, and lock out. Wait for internal pressure to fully release. 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 the 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 gauge. This number is the only basis for judging whether replacement is early or late; once removed, it is lost. 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 will prevent proper sealing of the new filter.
Step 4: Inspect seat and sealing surface Check three points: whether the seat is deformed, whether there is old gasket residue on the sealing surface, and whether the cover clamping mechanism is intact. Old gasket residue on the sealing surface is the most common cause of air leaks; the new filter may appear to be in place but is actually pressing against a ring of old rubber.
Step 5: Verify new part Compare the new filter with the old one side by side: outer diameter, overall height, and seal position. Then check that the part number on the box is 47557738001. If the site has a high-dust configuration, this step will reveal the issue—high-dust models require 24900318.
Step 6: Install new filter With the sealing surface facing the seat, insert vertically; do not tilt. After seating, press the outer ring by hand to confirm contact, then install the cover. Tighten evenly; do not tighten bolts on one side only, as uneven force on the sealing surface will leave gaps.
Step 7: Reassemble and test run Restore power, start the unit, and run unloaded for a few minutes. Listen for abnormal noise at the intake (leaks may cause whistling) and check whether the panel pressure drop returns to the new part level (approx. 0.2–0.5 kPa). If pressure drop is high, first check installation; do not immediately suspect the filter.
Step 8: Record Record the hour meter reading, replacement date, old and new pressure drops, and part number in the maintenance log. For future interval decisions, this line is more accurate than any manual.
5. Frequently Asked Questions
Q1: What is the difference between 47557738001 and 24900318?
The former is a standard intake filter, the latter is a high-dust intake filter. Both fit in the same position and look similar, but the 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 an immediate fault, but the replacement interval will be noticeably off.
Q2: My machine is RS45ie. Can I use this?
No. This part number only corresponds to RS45i, RS55i, and RS75i. Models with IE or NE suffixes use different intake part numbers. Before buying, read the full model on the nameplate, not just the leading numbers.
Q3: How many hours between replacements?
Under standard conditions, 4,000 hours. In dusty sites, do not stick to hours; check pressure drop: replace when it reaches 1.0–1.5 kPa (subject to panel setting). Some domestic channels state 2,000 hours; this figure 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 the filter media fibers and deform the pleat spacing, reducing dust holding capacity, and the damage is not visible. 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 strength when wet, and both strength and efficiency degrade after drying.
Q6: The pressure drop is high right after installation. Is it a filter problem?
Check the installation first. Old gasket residue on the sealing surface, uneven cover tightening, or incomplete seating of the filter can all cause high pressure drop. After ruling out these three, then suspect the filter itself.
Q7: How can I tell if the air filter is clogged or the oil filter is clogged?
Check two readings: if intake negative pressure (or air filter pressure drop) increases while discharge temperature changes little, it is likely the air filter; a clogged oil filter is usually accompanied by 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 kit structure, at the 4,000-hour interval, also replace the oil filter 24900433; at 8,000 hours, also add oil separator 23708423, return air filter 88089743, and two valve service kits. Of course, replacing only the air filter is 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 price difference mainly comes from filter media and workmanship: paper weight, pleat count, support strength, and 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?
Under unopened, dry, and dark conditions, it is recommended to use within 3 years. Filter media that has been exposed to moisture 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 | Part number 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 | Use 24900318 for this configuration |
Verification method: Read the full model (including suffix) on the unit nameplate, then compare the part number in the intake section of the parts manual 47612270. Only when both match is this the correct 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 part for same position. Use this number in high-dust sites |
| 24900433 | Oil Filter Element (FILTER, COOLANT) | Same 4,000-hour maintenance interval, replace together with air filter |
| 23708423 | Oil Separator Element | Added at 8,000-hour interval |
| 88089743 | Return Air Filter (.25 INCH BSPT) | Added at 8,000-hour interval |
| 24242398 | Dryer Filter | Used only on units with refrigerated dryer configuration |
| 47784006001 | 4,000h Standard Maintenance Kit | Includes 1 pc this part + 1 pc oil filter |
| 47784007001 | 4,000h Maintenance Kit with Dryer | Includes this part + oil filter + dryer filter |
| 47784008001 | 8,000h Standard Maintenance Kit | Includes this part + oil filter + oil separator + return air filter + two valve service kits |
Maintenance kits are graded 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 4,000-hour kit numbers; do not mix them.