Ingersoll Rand ATN18504 Air Filter Element

The ATN18504 is a genuine Ingersoll Rand intake air filter element engineered for ATN-series 185kW oil-free centrifugal compressors. Its micro-fiberglass media captures particles at 3.0 μm with 99.5% efficiency, shielding the high-speed impeller and diffuser from dust ingress and supporting ISO 8573-1 Class 0 oil-free air quality.

As a core service part in the centrifugal compressor intake system, the ATN18504 is built to Ingersoll Rand global technical standards with low initial pressure drop, high dust-holding capacity, and long service intervals — helping operators cut energy consumption and unplanned downtime.

Key Specifications

• Part number: ATN18504
• Brand: Ingersoll Rand
• Product line: CC (Centrifugal Compressor)
• Compatible machines: ATN-series oil-free centrifugal compressors, 185kW class
• Unit of measure: EA
• Availability: Normally stocked

Filtration Performance

• Filtration rating: 3.0 μm
• Efficiency: 99.5% @ 3.0 μm
• Filter class: F7 (medium-high efficiency, per EN 779 / ISO 16890)
• Dust-holding capacity: approx. 3.5 kg at rated flow / terminal resistance
• Beta ratio: β₃.₀ ≥ 200

The micro-fiberglass media outperforms standard rotary-screw compressor filters (F5, 98% @ 5 μm), meeting the higher intake cleanliness demands of centrifugal compressors and protecting the precision impeller and diffuser of 185kW units.

Flow and Pressure Drop

• Rated air flow: approx. 25–40 Nm³/min (for 185kW-class centrifugal units)
• Initial pressure drop: approx. 220–300 Pa at rated flow, clean condition
• Operating differential range: 300–550 Pa
• Alarm / terminal resistance: alarm at 650 Pa; replace at 800 Pa
• Energy impact: every 100 Pa of intake pressure loss adds approx. 0.35% to compressor shaft power

The micro-fiberglass design keeps clean pressure drop around 40% lower than comparable alternatives and dust-holding capacity around 89% higher, reducing running energy costs and extending replacement intervals.

Dimensions, Construction and Operating Limits

• Dimensions: approx. φ420 × φ220 × 380 mm (OD × ID × height)
• Effective filtration area: approx. 12–15 m² (pleated cartridge)
• Pleats: approx. 200–240 pleats, 6–8 mm pitch
• Media: micro-fiberglass, approx. 120–150 g/m²
• Support: inner galvanized metal support mesh + outer protective mesh
• End caps: polystyrene frame, lightweight, corrosion-resistant, incinerable
• Seal: one-piece polyurethane (PU) foam gasket, seamless fit, zero leakage
• Bonding: polyurethane adhesive, heat-resistant, no de-bonding
• Operating temperature: −20°C to 80°C continuous; max. 93°C (200°F)
• Relative humidity: ≤95% RH, no condensation
• Collapse pressure: ≥2.8 kPa differential
• Service life: approx. 6,000–8,000 hours (8–12 months) under standard conditions; 3,000–4,000 hours in high-dust environments
• Shelf life: 36 months in sealed packaging, dry, ambient storage

Standards and Compliance

• ISO 5011 — intake filter performance testing (efficiency and dust capacity)
• ISO 16889 — determination of beta ratio for filters
• ISO 16890 / EN 779 — general ventilation air filter classification
• ISO 29463 — high-efficiency air filter performance testing
• GB/T 14295 — air filters
• GB/T 6165 — air filter performance test methods (efficiency and resistance)

Replacement and Installation

Replacement intervals

• Standard conditions: every 6,000–8,000 hours or 8–12 months, whichever comes first
• High-dust conditions (mining, building materials, cement, steel): every 3,000–4,000 hours
• Immediately when the differential pressure alarm triggers (≥650 Pa)

Installation steps

1. Shut down and isolate: switch off main power, apply lockout/tagout (LOTO), confirm the unit has fully stopped and is depressurized.
2. Open the intake filter housing: release the clamps or bolts and remove the cover or access door.
3. Remove the old element: lift the old ATN18504 straight out and check whether the gasket remains in the housing groove.
4. Clean the housing: wipe the inner walls and sealing face with a clean cloth — no dust, oil, or foreign matter.
5. Inspect the new element: verify part number ATN18504, check media for damage, pleats for deformation, and gasket for aging.
6. Install the new element: seat it vertically in the housing center so the gasket contacts the sealing face evenly — no skew or twist.
7. Refit the housing: replace the cover and tighten bolts or clamps evenly for a gap-free seal.
8. Start up and leak-check: run the compressor, listen for air leaks at the intake filter, and confirm the differential pressure gauge returns to normal (initial drop should read 220–300 Pa).

FAQ for Procurement and Maintenance Teams

Q1: Which Ingersoll Rand compressors does the ATN18504 fit?
A: It is designed for ATN-series 185kW oil-free centrifugal compressors. If you are unsure about your model, provide the compressor serial number and we will match it precisely.

Q2: How is it different from a standard rotary-screw compressor air filter?
A: Centrifugal compressors demand far higher intake cleanliness. The ATN18504 uses micro-fiberglass media rated 99.5% @ 3.0 μm, while standard screw compressor filters are typically F5 (98% @ 5 μm). Using a standard filter can lead to impeller fouling, loss of dynamic balance, and costly impeller damage.

Q3: How do I know when to replace the element?
A: Three triggers: (1) operating differential pressure reaches the 650 Pa alarm value; (2) the 6,000–8,000 hour or 8–12 month interval is reached; (3) visual inspection shows damaged media or an aged, deformed gasket.

Q4: Is the ATN18504 a genuine part?
A: Yes — it is a genuine Ingersoll Rand service part produced to Ingersoll Rand global technical standards and compatible with the original intake filter housing.

Q5: Is one element enough?
A: Centrifugal compressor intake systems may use one or multiple elements depending on the filter assembly specification. Provide the serial number and we will confirm the configuration.

Related Part Numbers

• ATS11057 — air filter element, ATS-series centrifugal compressor (110kW class)
• ATN09504 — air filter element, ATN-series centrifugal compressor (95kW class)
• ATN10504 — air filter element, ATN-series centrifugal compressor (105kW class)
• ATN72018 — air filter element, large ATN-series centrifugal compressor (720kW class)
• A29504376 — pre-filter element for oil-free screw compressors
• A29504406 — main filter element for oil-free screw compressors (H11 class)
• A11516974 — panel-type element for medium centrifugal compressors
• A13368674 — panel-type element for large centrifugal compressors

Procurement note: Specifications above are compiled from Ingersoll Rand centrifugal compressor filtration system data and industrial filtration standards. For 100% accurate matching, send us the complete compressor serial number and we will check the original parts diagram and confirm current supply. OEM/ODM support, export packing, and datasheet requests are welcome — contact us for a quotation.