Product
Ingersoll Rand 47557738001 Standard Air Filter Element | RS45i/RS55i/RS75i
Ingersoll Rand 47557738001 standard air intake filter element for RS45i, RS55i, and RS75i 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 air intake filter element used on Ingersoll Rand RS45i, RS55i, and RS75i screw compressors. In the parts manual, the English name 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 wear the rotor and housing clearance. Once the clearance increases, compression efficiency drops—and this is irreversible. 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 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 |
| Compatible Models | RS45i, RS55i, RS75i |
| Incompatible Models | Units with IE / NE suffix; high-dust configuration units (use 24900318 for that configuration) |
| Installation Position | Between air intake and main intake valve |
| Replacement Interval | 4000 hours under standard conditions; earlier in dusty environments based on pressure differential |
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; not based on ventilation/air conditioning classification (G4 / F7, etc.) |
| Dust Holding Capacity | Typically 200–400 g for similar parts; exact value subject to incoming inspection or manufacturer data |
| Cleanable / Reusable | Not recommended. After water washing, paper media fibers collapse, reducing both dust holding capacity and efficiency |
These figures are useful for deciding whether to replace and whether the correct grade was purchased, but they are not suitable as acceptance criteria. For acceptance, check the pressure differential.
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 Pressure Differential Range | Continuously rises from new to replacement point; no fixed value |
| Alarm / Final Resistance | Commonly set at 1.0–1.5 kPa (10–15 mbar); refer 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 displacement |
Air filter elements should not be replaced only when clogged; they should be replaced when they reach a certain point. As pressure differential 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 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 physical count |
| Mounting Interface | Fits into intake housing seat, positioned by end-face seal; not threaded, not clamped |
| Sealing Method | Soft sealing ring on end cap, formed by housing clamping force |
| Installation Orientation | Front and back sides; sealing face toward seat, do not install reversed |
Before ordering, the easiest approach is to 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 Composition
| Component | Material | Description |
|---|---|---|
| Filter Media | Wood pulp fiber filter paper (resin impregnated for reinforcement) | Standard intake grade configuration |
| Media Basis Weight | Typically 120–160 g/m² for similar parts | Basis 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 sealing carrier |
| Seal | Nitrile rubber (NBR) or polyurethane | Ensures no bypass between element and seat |
| Adhesive Layer | Hot melt adhesive or polyurethane adhesive | Fixes 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 withstand high-humidity intake; not suitable for intake with continuous liquid water droplets |
| Burst Strength / Collapse Pressure | Must withstand intake negative pressure after clogging without collapsing; specific value per manufacturer drawings |
| 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 differential, not by fixed hours |
| Intermediate Inspection | Recommended every 2000 hours or quarterly: check filter surface and pressure differential |
| Shelf Life | Unopened, stored dry and away from light; use within 3 years recommended; moisture reduces media strength |
For continuous operation, follow hours; for intermittent operation or quarterly maintenance sites, follow calendar intervals, 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 original parts standard |
| Filtration Performance Testing | References air filter test framework such as ISO 5011; specific test report not attached for this part number |
| Environmental / Material Compliance | Refer to documentation supplied with goods |
Replacement part documentation often lists ISO 2941 / 2942 / 2943 series, which are hydraulic filter standards, and ISO 16889 multi-pass method for liquid filtration—neither applies to intake air filters and should not be used as performance basis.
4. Standard Maintenance and Installation Steps
Step 1: Stop machine, disconnect power, release pressure Press stop button, disconnect main power and lock out, wait for internal pressure to fully release. Intake pressure is not high, but residual pressure on the main unit side may cause rotor movement during disassembly. Wait until pressure gauge reads zero before proceeding.
Step 2: Record pressure differential 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 whether replacement is early or late, and it is lost after removal. Also record the hour meter reading.
Step 3: Open intake housing, remove old element Loosen housing cover or clamping mechanism, remove old element. Keep element level during removal to prevent surface dust from falling into intake chamber. Wipe the housing interior and seat with a clean cloth; dust on the seat can cause poor sealing of the new element.
Step 4: Inspect seat and sealing surface Focus on three points: seat deformation, old seal ring residue on sealing surface, and condition of housing cover clamping mechanism. Residual rubber on the sealing surface is the most common cause of air leaks; 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 check the housing part number is 47557738001. If the site has 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 angle. After positioning, 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 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 (leaks may cause whistling), check panel pressure differential returns to new element level (approx. 0.2–0.5 kPa). If pressure differential is high, first check installation, do not immediately suspect the element.
Step 8: Record Write hour meter reading, replacement date, old and new pressure differentials, and part number in maintenance log. This line is more accurate than any manual for determining the next interval.
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. They install in 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 significantly high dust. Installing the wrong one will not cause immediate failure, but the interval will be noticeably incorrect.
Q2: My machine is RS45ie. Can I use this?
No. This part number only corresponds to RS45i, RS55i, and RS75i. Units with IE or NE suffix have different intake part numbers. Before purchasing, read the full model on the nameplate, 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 differential: 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 the element with air and reuse it?
Not recommended. Blowing compressed air from inside out will loosen media fibers and deform pleat spacing, reducing dust holding capacity, and this is not visible to the eye. It may seem to save a part in the short term, but actually sends dust into the main unit.
Q5: Can it be washed with water?
No. Wood pulp fiber filter paper loses fiber bonding when wet, and strength and efficiency both degrade after drying.
Q6: The pressure differential is high right after installation. Is it the element?
Check installation first. Residual old rubber on sealing surface, uneven cover clamping, or element not fully seated can all cause high pressure differential. After ruling out these three, then suspect the element itself.
Q7: How to tell if the air filter is clogged or the oil filter is clogged?
Look at two values: if intake negative pressure (or air filter pressure differential) rises while discharge temperature changes little, it is likely the air filter; if oil filter is clogged, it is usually accompanied by oil pressure changes and rising discharge temperature. Reading both values together is more accurate than one alone.
Q8: What else should be replaced along with the air filter?
According to 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 of course 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 basis weight, pleat count, support strength, end cap sealing method. Cheaper parts often cut corners in these invisible areas, resulting in higher initial pressure differential, 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, use within 3 years is recommended. 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 | 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 that 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 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 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 (DRYER FILTER) | Only for units with refrigerated dryer configuration |
| 47784006001 | 4000h standard maintenance kit | Includes 1 x this part + 1 x 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 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.