Product
Ingersoll Rand 47557738001 Standard Air Filter | RS45i/55i/75i
Ingersoll Rand 47557738001 standard air intake filter element for RS45i, RS55i and RS75i screw compressors. Recommended 4000-hour change 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 screw 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 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, compression efficiency drops irreversibly. 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 part number 24900318. The two look similar; installing the wrong one will not cause an immediate fault, but in dusty sites the standard element will clog prematurely and the replacement interval will be significantly shortened. 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 the intake part numbers 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 for that configuration) |
| Installation Position | Between air inlet and main intake valve |
| Replacement Interval | 4000 hours under standard conditions; earlier in dusty environments based on pressure drop |
3. Technical Specifications
3.1 Filtration Performance Parameters (Core Indicators)
| 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-filter grade, characterized by efficiency and dust holding capacity; not classified under ventilation/air conditioning systems (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. Paper filter media collapses after water washing, reducing both dust holding capacity and efficiency |
These figures are useful for judging whether to replace and whether the grade is correct, but not 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 Range | 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 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 |
The air filter element should not be replaced only when clogged, but when it reaches a certain point. As pressure drop 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 price of the filter itself.
3.3 Structural Dimensions and Installation Parameters
| Parameter | Value / Description |
|---|---|
| Overall Dimensions | Depend 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 / Pleat Spacing | Depends on filter media and area design; verify by physical count |
| Mounting Interface | Fits into intake box seat, located 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 face toward 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 face inner diameter. Matching these three numbers usually ensures correct fit.
3.4 Material Construction
| 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 gasket, 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 filter media |
3.5 Operating Condition Tolerance Parameters
| 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 intake with liquid water droplets |
| Burst Strength / Collapse Pressure | Must withstand intake negative pressure after filter clogging without collapsing; specific value per manufacturer drawings |
| Special Functions | None. Standard type does not have oil-proof, water-proof, flame-retardant or other special 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 drop, not strictly by hours |
| Intermediate Inspection | Recommended every 2000 hours or quarterly: check filter surface and pressure drop |
| Shelf Life | Unopened, stored dry and away from light; use within 3 years; moisture reduces media strength |
For continuous operation, use hours as primary; for intermittent operation or quarterly maintenance sites, follow calendar intervals, whichever comes first. Some domestic channels state approx. 2000 hours; this figure is conservative and can be used as an advance margin in dusty environments.
3.7 Standards
| Item | Description |
|---|---|
| Manufacturer Standard | Ingersoll Rand genuine parts standard |
| Filtration Performance Test | Refer to 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 |
Replacement part documentation often mentions 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, power off, depressurize Press stop button, disconnect main power and lock out/tag out, wait for internal pressure to fully release. Intake side pressure is low, but main unit side has residual pressure; rotor may be turned by airflow during disassembly. Wait until pressure gauge reads zero.
Step 2: Record pressure drop before replacement Before removal, read and record current intake resistance from panel or pressure gauge. This number is the only basis for judging early or late replacement; it is lost after removal. Also record hour meter reading.
Step 3: Open intake box, remove old element Loosen box cover or clamping mechanism and remove old element. Keep element level during removal to prevent surface dust from falling into intake chamber. Wipe inner walls and seat with a clean cloth; dust on seat will prevent proper sealing of new element.
Step 4: Inspect seat and sealing surface Check three points: seat deformation, old gasket residue on sealing surface, and condition of cover clamping mechanism. Residual old rubber ring on sealing surface is the most common cause of air leakage; new element may appear seated but is actually pressing on old rubber.
Step 5: Verify new part Compare new element with old side by side: outer diameter, overall height, seal face position. Also check part number on box is 47557738001. If site is 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 tilt. After seating, press outer ring by hand to confirm fit, then install cover. Tighten evenly; do not tighten only one side, otherwise uneven pressure on sealing surface may leave gaps.
Step 7: Restore and test run Restore power, start machine, run unloaded for a few minutes. Listen for abnormal noise at intake (whistling indicates leakage), check panel pressure drop returns to new element level (approx. 0.2–0.5 kPa). If pressure drop is high, first check installation, do not immediately suspect the element.
Step 8: Record Write hour meter reading, replacement date, old and new pressure drops, and part number in maintenance record. This line is more accurate than any manual for determining 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 are installed in the same position and look similar, but the filter media and dust holding capacity differ. The standard part is for normal intake environments, the high-dust part 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, RS75i. Units with IE or NE suffix have different intake part numbers. Read the complete 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 strictly follow hours; check pressure drop: 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 advance margin in dusty environments.
Q4: Can the filter be blown clean and reused?
Not recommended. Blowing compressed air from inside out will loosen filter media fibers and deform pleat spacing, reducing dust holding capacity, and this 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, strength and efficiency both decrease.
Q6: Pressure drop is high right after installation. Is it the filter's problem?
Check installation first. Residual old rubber ring on sealing surface, uneven cover clamping, or element not fully seated can all cause high pressure drop. 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?
Check two values: if intake negative pressure (or air filter pressure drop) rises while discharge temperature changes little, it is likely the air filter; if oil filter is clogged, oil pressure changes and discharge temperature usually rise. Reading both values 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 fine, 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 filter media and workmanship: paper basis 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 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. Moisture-affected filter media may look normal but strength has decreased; it may collapse under negative pressure and block intake after installation.
6. Compatible Models
| Model | Applicability | Notes |
|---|---|---|
| RS45i | Applicable | Listed in parts manual and price list |
| RS55i | Applicable | Same as above |
| RS75i | Applicable | Same as above |
| RS45ie / RS55ie / RS75ie | Not applicable | Different model suffix, different intake part number |
| RS45ne / RS55ne / RS75ne | Not applicable | Same as above |
| Other RS series (RS30, RS90 and above) | Not applicable | Different frame, intake parts not interchangeable |
| High-dust configuration RS45i / RS55i / RS75i | Not applicable | That configuration should use 24900318 |
Verification method: check complete model on machine nameplate (including suffix), then compare part number in intake section of parts manual 47612270. Both must match for this part.
7. Related Parts
The following are parts in the same RS45i / RS55i / RS75i family, related to the intake side or same maintenance interval:
| Part Number | Name | Relationship |
|---|---|---|
| 24900318 | High-dust air filter element | Upgrade part in same position. Use this number for 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 element (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 element |
| 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; please refer to the maintenance kit list in the machine parts manual before purchasing. Units with and without refrigerated dryer have different 4000-hour kit numbers; do not mix.