Product
Ingersoll Rand 47557738001 Standard Air Filter | RS45i/55i/75i Element
Standard Ingersoll Rand 47557738001 air filter element for RS45i, RS55i and RS75i screw compressors. 4000-hour service interval in standard conditions; not for IE/NE suffix units or high-dust configurations (use 24900318).
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1. Product Overview
The 47557738001 is the standard intake air filter element used on Ingersoll Rand RS45i, RS55i and RS75i screw compressors. In the parts manual it is listed as ELEMENT, AIR FILTER (STANDARD).
It is located after the machine 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 wear the rotor and casing clearance; once the clearance increases, pumping efficiency drops irreversibly. The air filter element guards this critical point.
The same three models have 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 trigger an immediate fault, but in high-dust sites the standard element will clog prematurely and the replacement interval will be noticeably shorter. Check the site conditions before deciding 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 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 | Units with IE / NE suffix; high-dust configuration units (use 24900318) |
| Installation Position | Between air inlet and main intake valve |
| Replacement Interval | 4000 hours in 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 captures particles above 10 μm |
| Filtration Efficiency | ≥99% (standard test dust, rated airflow) |
| Filter Class | Intake pre-filtration grade, characterized by efficiency and dust holding capacity; not classified under ventilation/air conditioning systems (G4 / F7 etc.) |
| Dust Holding Capacity | Common range 200–400 g for similar parts; exact value per incoming inspection or manufacturer data |
| Cleanable / Reusable | Not recommended. Paper media fibers collapse after water 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, check differential pressure.
3.2 Flow and Resistance Parameters
| Parameter | Value / Description |
|---|---|
| Rated Airflow | Varies by model; covers intake air volume corresponding to RS45i / RS55i / RS75i displacement |
| Initial Pressure Drop | Approx. 0.2–0.5 kPa (2–5 mbar) |
| Operating Differential Pressure 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 machine panel settings |
| Pressure Drop vs. Energy Consumption | Each 1 kPa increase in intake resistance raises shaft power 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. When differential pressure rises from 0.3 kPa to 1.2 kPa, the machine still runs, but electricity is being overpaid. 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 price of the filter itself.
3.3 Dimensions and Installation Parameters
| Parameter | Value / Description |
|---|---|
| Dimensions | Depends on intake housing design; not marked on this page; refer to actual measurement of 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 on actual part |
| Mounting Interface | Fits into intake housing seat, positioned by face seal; not threaded, not clamped |
| Sealing Method | Soft sealing ring on end cap, formed by housing compression |
| Installation Orientation | Front/back orientation; sealing face toward seat, do not reverse |
Before ordering, 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 | Notes |
|---|---|---|
| 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 sealing ring, or polyurethane foam end caps | Also serve as seal 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 | Can handle high-humidity intake; not suitable for intake with continuous liquid water droplets |
| Burst Strength / Collapse Pressure | Must withstand intake negative pressure after 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 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 | Recommended every 2000 hours or quarterly: check filter surface and differential pressure |
| Shelf Life | Unopened, stored dry and away from light; use within 3 years. Media strength decreases after moisture absorption |
For continuous operation, base replacement on hours; for intermittent operation or quarterly maintenance sites, use calendar intervals, whichever comes first. Some domestic channels state approx. 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 part standard |
| Filtration Performance Testing | Referenced to air filter test framework such as ISO 5011; this part number does not include a specific test report |
| Environmental / Material Compliance | Refer to documents supplied with shipment |
ISO 2941 / 2942 / 2943 series commonly found in replacement part literature are hydraulic filter standards, and ISO 16889 multi-pass method is 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/tag out, and wait for internal pressure to fully release. Intake side pressure is not high, but there is residual pressure on the main unit side; the rotor may be driven by airflow 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 and 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 ring residue on sealing surface, and condition of cover clamping mechanism. Residual rubber ring on the sealing surface is the most common cause of air leakage; the new element may appear seated but is actually pressing on an old rubber ring.
Step 5: Verify new part Compare new element with old side by side: outer diameter, overall height, seal face position. Also verify the part number on the housing is 47557738001. If the site is high-dust configuration, this step will reveal the issue—high-dust machines require 24900318.
Step 6: Install new element With sealing face toward seat, insert vertically; do not angle. After positioning, press the outer ring by hand to confirm contact, then install cover. Tighten evenly; do not tighten bolts on one side only, as uneven force will leave gaps in the sealing surface.
Step 7: Restore and test run Restore power, start the machine, and run unloaded for a few minutes. Listen for abnormal noise at the intake (leakage may cause whistling) and check if panel differential pressure returns to new-part level (approx. 0.2–0.5 kPa). If pressure is high, first check installation; do not immediately suspect the element.
Step 8: Record Write 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 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 noticeably 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 suffix have different intake part numbers. Read the full model on the nameplate before purchasing; do not rely only on the leading numbers.
Q3: How many hours before replacement?
4000 hours in standard conditions. In dusty sites, do not rely solely on hours; check differential pressure: 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 trigger in dusty environments.
Q4: Can I blow clean the element and reuse it?
Not recommended. Blowing compressed air from inside out will loosen media fibers and deform 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 when wet; after drying, both strength and efficiency degrade.
Q6: Differential pressure is high right after installation. Is it the element?
Check installation first. Residual old rubber ring on sealing surface, uneven cover tightening, or incomplete seating will cause high differential pressure. 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 differential pressure) rises while discharge temperature changes little, it is likely the air filter; a clogged oil filter usually accompanies oil pressure change 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, 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 the intervals of other parts.
Q9: Why is there a big price difference for the same model air filter?
The difference mainly comes from 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 machines, 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, use within 3 years. Media that has absorbed moisture may look normal but strength has decreased; it may collapse under negative pressure after installation and block intake.
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 | Use 24900318 for this configuration |
Verification method: Read the full model on the machine 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 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 for same position. Use this number in 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 | Only for units with refrigerated dryer configuration |
| 47784006001 | 4000h Standard Maintenance Kit | Includes 1 × this part + 1 × oil filter element |
| 47784007001 | 4000h Maintenance Kit with Dryer | Includes this part + oil filter element + 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 machine configuration. Before purchasing, refer to the maintenance kit list in the machine parts manual. Units with and without refrigerated dryers have different 4000-hour kit numbers; do not mix them.