Product
Ingersoll Rand 47557738001 Standard Air Filter for RS45i/RS55i/RS75i
Ingersoll Rand 47557738001 standard air intake filter for RS45i, RS55i and RS75i screw compressors. Recommended 4,000-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 air intake 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 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 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 and installing the wrong one will not cause an immediate fault, but in high-dust environments the standard element will clog prematurely, significantly shortening the replacement interval. Always check the site conditions before ordering.
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 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 | 4,000 hours under standard conditions; earlier based on differential pressure in dusty environments |
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% (under standard test dust and rated airflow) |
| Filter Class | Intake pre-filtration grade, characterized by efficiency and dust holding capacity; not comparable to ventilation/AC grading (G4 / F7 etc.) |
| Dust Holding Capacity | Typical range 200–400 g for similar parts; exact value per 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 for acceptance testing. 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 | Typical setting 1.0–1.5 kPa (10–15 mbar), per 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 be replaced not only when clogged, but 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 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 filter's cost.
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, located by end-face seal; no threads, no clamps |
| Sealing Type | Soft seal ring on end cap, formed by box compression |
| 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 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 Weight | Typically 120–160 g/m² for similar parts | 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 seal ring, 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 intake with continuous liquid water droplets |
| Burst Strength / Collapse Pressure | Must withstand intake negative pressure after clogging without collapse; exact value per manufacturer drawing |
| Special Functions | None. Standard type without oil-proof, water-proof, or flame-retardant treatment |
3.6 Life and Maintenance Parameters
| Parameter | Value / Description |
|---|---|
| Recommended Replacement Interval | 4,000 hours (standard conditions) |
| Interval in Dusty Environments | Significantly shorter; judge by differential pressure, not fixed hours |
| Intermediate Inspection | Recommended every 2,000 hours or quarterly: check filter surface and differential pressure |
| Shelf Life | Unopened, stored dry and away from light; use within 3 years; moisture reduces media strength |
For continuous operation, use hours; for intermittent operation or quarterly maintenance, use calendar intervals, whichever comes first. Some domestic channels state about 2,000 hours, which is conservative and can be used as an early replacement guide in dusty environments.
3.7 Standards
| Item | Description |
|---|---|
| Manufacturer Standard | Ingersoll Rand genuine parts standard |
| Filtration Performance Test | References air filter test framework such as ISO 5011; no specific test report attached for this part number |
| Environmental / Material Compliance | Per documentation supplied with goods |
ISO 2941 / 2942 / 2943 series commonly seen in replacement part documentation are hydraulic filter standards, and ISO 16889 multi-pass method is 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, disconnect power, release pressure. Press stop button, disconnect main power and lock out, wait for internal pressure to release. Intake pressure is low, but main unit side has residual pressure; rotor may be driven by airflow during disassembly. Wait until pressure gauge reads zero.
Step 2: Record differential pressure before replacement. Before removal, read and record current intake resistance from panel or gauge. This 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 cover or clamping mechanism, remove old element. Keep element level to prevent surface dust from falling into intake chamber. Wipe inside of box and seat with clean cloth; dust on seat can cause poor sealing of new element.
Step 4: Inspect seat and sealing face. Check three points: seat deformation, old seal ring residue on sealing face, and condition of cover clamping mechanism. Residual rubber ring on sealing face 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. Verify 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. Seal face toward seat, insert vertically, do not tilt. After seating, press outer ring to confirm fit, then install cover. Tighten evenly; do not tighten only one side, as uneven force may leave gaps.
Step 7: Restore and test run. Restore power, start unit, run unloaded for a few minutes. Listen for abnormal noise at intake (whistling indicates leakage), check panel differential pressure returns to new element level (approx. 0.2–0.5 kPa). If pressure is high, first check installation, not the element.
Step 8: Record. Write hour meter reading, replacement date, old and new differential pressures, and part number in maintenance log. This line is more accurate than any manual for future interval decisions.
5. FAQ
Q1: What is the difference between 47557738001 and 24900318?
The former is the standard intake filter, the latter is the high-dust intake filter. They install in the same position and look similar, but media and dust holding capacity differ. Standard part is for normal intake environments; 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, RS75i. Units with IE or NE suffix have different intake part numbers. Read the full model on the nameplate before purchasing, not just the leading numbers.
Q3: How many hours between replacements?
4,000 hours under standard conditions. In dusty sites, do not rely on hours; check differential pressure: replace at 1.0–1.5 kPa (per panel setting). Some domestic channels state 2,000 hours, which is conservative and can be used as an early replacement guide in dusty environments.
Q4: Can I blow it clean and reuse?
Not recommended. Compressed air from inside out will loosen media fibers and deform pleat spacing, reducing dust holding capacity, and it 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, and strength and efficiency both degrade after drying.
Q6: Differential pressure is high right after installation. Is it the filter?
Check installation first. Residual old rubber ring on sealing face, uneven cover tightening, or element not fully seated can all cause high pressure. After ruling out these three, then suspect the element itself.
Q7: How to tell if air filter or oil filter is clogged?
Check two values: if intake negative pressure (or air filter differential pressure) rises without significant change in discharge temperature, it is likely the air filter; clogged oil filter usually accompanies oil pressure change and rising discharge temperature. Read both values together for better accuracy.
Q8: What else should be replaced with the air filter?
According to the maintenance kit structure, at 4,000 hours also replace oil filter element 24900433; at 8,000 hours also add oil separator element 23708423, return air filter 88089743 and two valve service kits. Replacing only the air filter is acceptable, but do not delay other parts beyond their intervals.
Q9: Why is there a big price difference for the same model air filter?
Price differences mainly come 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 easier collapse when damp. For continuously running units, this price difference is usually offset by electricity and downtime costs.
Q10: Can it be used after long storage?
Unopened, stored dry and away from light, use within 3 years. 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 | Applicability | Notes |
|---|---|---|
| RS45i | Applicable | Part number 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 | Use 24900318 for that configuration |
Verification method: Read the full model (including suffix) on the unit nameplate, then compare 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 part for same position. Use this number in high-dust sites |
| 24900433 | Oil Filter Element (FILTER, COOLANT) | Same 4,000-hour maintenance interval, replace together with air filter |
| 23708423 | Oil Separator Element | Added at 8,000-hour interval |
| 88089743 | Return Air Filter (.25 INCH BSPT) | Added at 8,000-hour interval |
| 24242398 | Dryer Filter Element (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 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 unit configuration; please refer to the maintenance kit list in the unit's parts manual before ordering. Units with and without refrigerated dryer have different 4000-hour kit numbers; do not mix them.