Product
Ingersoll Rand 47557738001 Standard Air Filter | RS45i/55i/75i
Ingersoll Rand 47557738001 standard air filter element for RS45i, RS55i and RS75i screw compressors. For standard intake conditions; replace at 4000 hours. 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 designation in the parts manual is ELEMENT, AIR FILTER (STANDARD).
It is located after the unit 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 and the loss is irreversible. The air filter element guards this critical point.
For these 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; installing the wrong one will not trigger an immediate fault, but in dusty sites the standard element will clog prematurely and the replacement interval will be noticeably shortened. Check the site conditions first, then specify 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 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 those) |
| Installation Location | Between air inlet and main intake valve |
| Replacement Interval | 4000 hours under standard conditions; earlier in dusty environments based on differential pressure |
3. Technical Specifications
3.1 Filtration Performance (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-filtration grade, characterized by efficiency and dust holding capacity; HVAC classification (G4 / F7 etc.) does not apply |
| 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 fibers collapse after water washing, reducing both dust holding capacity and efficiency |
These figures are useful for judging whether to replace and whether the correct grade was purchased; they are not suitable as acceptance criteria. For acceptance, use 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 | Rises continuously from new to replacement point; no fixed value |
| Alarm / Final Resistance | Common setting 1.0–1.5 kPa (10–15 mbar); refer to unit panel setting |
| Pressure Drop vs. Energy Consumption | Each 1 kPa increase in intake resistance raises shaft power by approx. 0.3%–0.5% at constant discharge volume |
The air filter should be replaced when it reaches a certain point, not just when clogged. As 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 price of the filter itself.
3.3 Dimensions and Installation Parameters
| Parameter | Value / Description |
|---|---|
| External Dimensions | Depends on intake box design; not marked on this page; measure old part for reference |
| 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; not threaded, not clamped |
| Sealing Method | Soft sealing ring on end cap, formed by compression from housing |
| Installation Orientation | Oriented; sealing face toward seat, do not install backwards |
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 seal carrier |
| Sealing Element | Nitrile rubber (NBR) or polyurethane | Ensures no bypass between element and 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 / 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 fixed hours |
| 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 recommended; moisture reduces media strength |
For continuous operation, hours-based intervals apply; for intermittent operation or quarterly maintenance sites, use calendar intervals, whichever comes first. Some domestic channels state approx. 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 Test | References air filter test framework such as ISO 5011; specific test report not attached to this part number |
| Environmental / Material Compliance | Refer to documents supplied with shipment |
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, disconnect power, relieve pressure Press stop button, disconnect main power and lock 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 differential pressure before replacement Before removal, read and record current intake resistance from panel or differential pressure gauge. This number is the only basis for judging early or late replacement; once removed, it is lost. Also record hour meter reading.
Step 3: Open intake box, remove old element Loosen 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 can cause poor sealing of 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 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 side-by-side with old: 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 Sealing face toward seat, insert vertically, do not tilt. After seating, press outer ring by hand to confirm contact, then install cover. Tighten evenly; do not tighten bolts on one side only, as uneven force can leave gaps in sealing surface.
Step 7: Restore and test run Restore power, start unit, run unloaded for a few minutes. Listen for abnormal noise at intake (leaks cause whistling), check panel differential pressure returns to new-element level (approx. 0.2–0.5 kPa). If pressure is high, first check installation; do not immediately suspect the element.
Step 8: Record Enter hour meter reading, replacement date, old and new differential pressures, and part number in 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 location and look similar, but media and dust holding capacity differ. Standard element is for normal intake environments; high-dust element is for sites with noticeably 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 corresponds only to RS45i, RS55i and RS75i. Units with IE or NE suffix use different intake part numbers. Read the full model on the nameplate before purchasing, not just the leading numbers.
Q3: How often should it be replaced?
Standard conditions: every 4000 hours. 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 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 out loosens media fibers and deforms pleat spacing, reducing dust holding capacity, often invisibly. 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 degrade.
Q6: Differential pressure is high right after installation. Is the filter at fault?
Check installation first. Residual old rubber ring on sealing surface, uneven cover tightening, or element not fully seated can all 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?
Look at 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 comes with 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 element 24900433; at 8000 hours also add oil separator element 23708423, return air filter 88089743, and two valve service kits. Replacing only the air filter is of course possible, but do not delay other parts beyond their intervals.
Q9: Why is there a big price difference for the same model air filter?
The difference mainly comes from 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?
Unopened, stored dry and away from light, use within 3 years recommended. Moisture-affected media may look normal but strength has degraded; installation may lead to collapse under negative pressure and intake blockage.
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 | Use 24900318 for this configuration |
Verification method: Check the full model on the unit nameplate (including suffix), then compare part number with the intake section of parts manual 47612270. Both must match for this part.
7. Related Parts
The following are parts in 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 location. 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 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. Before ordering, refer to the maintenance kit list in the unit parts manual. Units with and without refrigerated dryer have different 4000-hour kit numbers; do not mix them.