Product
Ingersoll Rand 47557738001 Standard Air Filter | RS45i/RS55i/RS75i
Ingersoll Rand 47557738001 standard air filter element for RS45i, RS55i, and RS75i rotary screw compressors. 4000-hour service interval under standard 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 rotary screw compressors. The English designation in the parts manual is ELEMENT, AIR FILTER (STANDARD).
It is located after the compressor intake and before the main inlet valve. Ambient air passes through it before entering the compression chamber. If dust particles enter the airend directly, they wear the rotor and casing clearances; once clearance increases, volumetric efficiency drops irreversibly. The air filter element guards this critical point.
For these three models, two intake 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 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 Location | Between intake and main inlet 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 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; 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 washing, reducing both dust holding capacity and efficiency |
These figures help determine whether to replace and whether the correct grade was purchased; they are not suitable as acceptance criteria. For acceptance, rely on differential pressure.
3.2 Flow and Resistance Parameters
| Parameter | Value / Description |
|---|---|
| Rated Airflow | Varies by model; covers intake air volumes corresponding to RS45i / RS55i / RS75i discharge capacities |
| Initial Pressure Drop | Approx. 0.2–0.5 kPa (2–5 mbar) |
| Operating Differential Pressure Range | Rises continuously from new to replacement point; no fixed value |
| Alarm / Final Resistance | Typical setting 1.0–1.5 kPa (10–15 mbar); refer to unit panel settings |
| Pressure Drop vs. Energy Consumption | Each 1 kPa increase in intake resistance raises shaft power by approx. 0.3%–0.5% at constant discharge |
Air filters should not be replaced only when completely clogged; they should be replaced when they reach a certain point. As 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 energy 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 Dimensions and Installation Parameters
| Parameter | Value / Description |
|---|---|
| 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 counting the actual part |
| Mounting Interface | Fits into intake housing seat, positioned by end-face seal; no threads, no clamps |
| Sealing Method | Soft gasket on end cap, compressed by housing |
| Installation Orientation | Oriented; sealing face toward seat, do not install reversed |
Before ordering, remove the old element and measure three dimensions: outer diameter, overall height, and seal face inner diameter. Matching these three numbers ensures correct fit.
3.4 Material Construction
| Component | Material | Description |
|---|---|---|
| Filter Media | Wood pulp fiber filter paper (resin-impregnated for reinforcement) | Standard intake grade |
| 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 gasket, or polyurethane foam end caps | Also serve as sealing carrier |
| Seal | Nitrile rubber (NBR) or polyurethane | Ensures no bypass at 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 | Handles 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 without oil-proof, water-proof, or flame-retardant treatment |
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 by hours alone |
| Intermediate Inspection | Inspect filter surface and differential pressure every 2000 hours or quarterly |
| Shelf Life | Unopened, stored dry and away from light, use within 3 years; moisture reduces media strength |
For continuous operation, hours-based intervals apply; for intermittent operation or quarterly maintenance sites, calendar-based intervals apply, whichever comes first. Some domestic channels state approximately 2000 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 Testing | References air filter test frameworks such as ISO 5011; no specific test report attached to this part number |
| Environmental / Material Compliance | Per documentation supplied with shipment |
Replacement part documentation often lists 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, disconnect power, relieve pressure Press the stop button, disconnect main power and lock out, and wait for internal pressure to bleed off. Intake pressure is low, but residual pressure on the airend side can cause the rotor to turn during disassembly. Wait until the pressure gauge reads zero before proceeding.
Step 2: Record differential pressure before replacement Before removal, read the current intake resistance from the panel or differential pressure gauge and record it. 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 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 seal residue on the sealing surface, and condition of the cover clamping mechanism. Residual O-ring 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 the new element with the old one side by side: outer diameter, overall height, seal face position. Then verify the part number on the housing is 47557738001. If the site is high-dust configuration, this step will reveal the issue—high-dust models require 24900318.
Step 6: Install new element With sealing face toward 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 only one side, as uneven force on the sealing surface can leave gaps.
Step 7: Restore and test run Restore power, start the unit, and run unloaded for a few minutes. Listen for abnormal noise at the intake (leaks cause whistling) and check whether panel differential pressure returns to new-element level (approx. 0.2–0.5 kPa). If pressure is high, first check installation; do not immediately suspect the element.
Step 8: Record Write the 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. 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 fit the same location 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 noticeably 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, and 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 solely on hours; monitor differential pressure: replace at 1.0–1.5 kPa (per panel setting). Some domestic channels state 2000 hours; this figure is conservative and can be used as an early replacement trigger in dusty environments.
Q4: Can I blow out the filter and reuse it?
Not recommended. Blowing compressed air from inside out loosens media fibers and distorts pleat spacing, reducing dust holding capacity, often invisibly. It may seem to save a part short-term, but actually sends dust into the airend.
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: Differential pressure is high right after installation. Is the filter at fault?
Check installation first. Residual old O-ring on the sealing surface, uneven cover tightening, or an element not fully seated can all cause high pressure. After ruling out these three, then suspect the element itself.
Q7: How can I tell if the air filter is clogged or the oil filter is clogged?
Look at two readings: if intake negative pressure (or air filter differential pressure) rises while discharge temperature remains relatively stable, 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 along with the air filter?
Per the maintenance kit structure, the 4000-hour interval also includes oil filter element 24900433; at 8000 hours, also replace oil separator element 23708423, return air filter 88089743, and two valve service packs. Replacing only the air filter is fine, but do not delay other items beyond their intervals.
Q9: Why is there a big price difference for the same model air filter?
The difference mainly comes from media and construction: paper weight, pleat count, support 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 energy and downtime costs.
Q10: Can it be used after long storage?
Under unopened, dry, and dark conditions, use within 3 years. Moisture-affected media may look normal but strength has decreased; it can 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: Check the full model on the unit nameplate (including suffix), 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 are parts from the same RS45i / RS55i / RS75i family, related to the intake side or the same maintenance interval:
| Part Number | Name | Relationship |
|---|---|---|
| 24900318 | High-Dust Air Filter Element | Upgrade for same location. Use this number in dusty 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 | Only for units with refrigerated dryer configuration |
| 47784006001 | 4000h Standard Maintenance Kit | Includes 1 pc this part + 1 pc oil filter |
| 47784007001 | 4000h Maintenance Kit with Dryer | Includes this part + oil filter + dryer filter |
| 47784008001 | 8000h Standard Maintenance Kit | Includes this part + oil filter + oil separator + return air filter + two valve service packs |
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.