Product
Ingersoll Rand 47557738001 Standard Air Filter | RS45i/55i/75i
Ingersoll Rand 47557738001 standard air intake filter for RS45i, RS55i, 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
47557738001 is the standard air intake filter element used on Ingersoll Rand RS45i, RS55i, and RS75i screw air compressors. The English name in the parts manual is ELEMENT, AIR FILTER (STANDARD).
It is located after the machine air inlet and before the main air inlet 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, and this is irreversible. The air filter element's role is to guard this critical point.
For these same three models, there are two intake-side 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 immediately trigger a fault, but in high-dust sites 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 in the model. RS45i and RS45ie, 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 Location | Between air inlet and main air inlet valve |
| Replacement Interval | 4000 hours in standard conditions; earlier in dusty environments based on pressure differential |
3. Technical Specifications
3.1 Filtration Performance (Core Indicators)
| Parameter | Value / Description |
|---|---|
| Filtration Rating | Approx. 3–10 μm, primarily captures 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 classified under HVAC systems (G4 / F7 etc.) |
| Dust Holding Capacity | Common range for similar parts: 200–400 g; exact value subject to incoming inspection or manufacturer data |
| Cleanable / Reusable | Not recommended. After water washing, paper filter media fibers collapse, and both dust holding capacity and efficiency decrease |
These figures are suitable for judging whether to replace and whether the correct grade was purchased, but not as acceptance criteria. For acceptance, check pressure differential.
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 | Common setting 1.0–1.5 kPa (10–15 mbar), subject to machine 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 not be replaced only when clogged; they should be replaced when they reach a certain point. When pressure differential rises from 0.3 kPa to 1.2 kPa, the machine still runs, but you are already paying extra electricity. At an estimated 0.4%/kPa, the extra electricity consumed by a 75 kW unit during the latter 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; measure 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 box seat, positioned by end-face seal; not threaded, not clamped |
| Sealing Method | Soft sealing ring on end cap, formed by compression from housing |
| Installation Orientation | Front/back orientation; sealing face toward seat, do not install reversed |
Before ordering, remove the old part and measure three dimensions: outer diameter, overall height, and seal face inner diameter. Matching these three numbers essentially eliminates errors.
3.4 Material Construction
| Component | Material | Description |
|---|---|---|
| Filter Media | Wood pulp fiber filter paper (resin-impregnated reinforced) | 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 |
| Seal | Nitrile rubber (NBR) or polyurethane | Ensures no bypass at seat |
| Adhesive | Hot melt glue 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 / 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 differential, not 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. 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 margin in dusty environments.
3.7 Standards
| Item | Description |
|---|---|
| Manufacturer Standard | Ingersoll Rand genuine parts standard |
| Filtration Performance Testing | References air filter test framework such as ISO 5011; no specific test report attached to this part number |
| 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 basis for procurement.
4. Standard Maintenance and Installation Steps
Step 1: Stop machine, disconnect power, release pressure Press stop button, disconnect main power and lock out/tag out, wait for internal pressure to fully release. Intake side 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 differential before replacement Before removal, read and record the current intake resistance from the panel or differential gauge. This number 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 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 the new filter from sealing properly.
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 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, seal face position. Also verify the part number on the box is 47557738001. If the site is high-dust configuration, this step will reveal the issue—high-dust machines require 24900318.
Step 6: Install new filter 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 will leave gaps.
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 that panel pressure differential returns to new-part level (approx. 0.2–0.5 kPa). If differential is high, first check installation; do not immediately suspect the filter.
Step 8: Record Record hour meter reading, replacement date, old and new pressure differentials, 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, the latter is the high-dust intake filter. 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 interval will be noticeably off.
Q2: My machine is RS45ie. Can I use this?
No. This part number only corresponds 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 often should it be replaced?
Every 4000 hours in standard conditions. In dusty sites, do not stick to hours; check pressure differential: replace when it reaches 1.0–1.5 kPa (subject to panel setting). Some domestic channels state 2000 hours; this figure is conservative and can be used as an early replacement margin in dusty environments.
Q4: Can the filter be blown out and reused?
Not recommended. Blowing compressed air from inside to outside will loosen media fibers, deform pleat spacing, and reduce dust holding capacity, with no visible signs. Short-term savings often result in dust being sent 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: Pressure differential is high right after installation—is it the filter?
Check installation first. Residual old rubber ring on sealing surface, uneven cover tightening, or filter not fully seated can all cause high differential. After ruling out these three, then suspect the filter 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) rises 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 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 only the air filter is acceptable, but do not delay other parts' intervals.
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. Moisture-affected media may look normal but strength has decreased; installation may cause collapse under negative pressure and block intake.
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 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 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 | Upgrade part for same location. Use for high-dust sites |
| 24900433 | Oil Filter (FILTER, COOLANT) | Same 4000-hour maintenance interval, replace 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 | Only for units with refrigerated dryer configuration |
| 47784006001 | 4000h Standard Maintenance Kit | Includes 1 x this part + 1 x 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 kits |
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.