Ingersoll Rand ATN18504 Air Filter Element

Genuine Ingersoll Rand ATN18504 air filter element for ATN-series 185kW oil-free centrifugal compressors. Micro-fiberglass media delivers 99.5% filtration efficiency at 3.0 μm, low initial pressure drop and high dust-holding capacity to protect the high-speed precision impeller and diffuser from erosion — supporting ISO 8573-1 Class 0 oil-free air quality.

As a core consumable of the centrifugal compressor intake filtration system, the ATN18504 is built to Ingersoll Rand global technical standards and is supplied through export-ready channels for distributors, OEM partners and MRO procurement teams.

Key Specifications

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

Filtration Performance

• Filtration rating: 3.0 μm
• Filtration 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 to terminal resistance
• Beta ratio: β₃.₀ ≥ 200

The ATN18504 uses micro-fiberglass media rated at 99.5% efficiency for particles 3.0 μm and above — significantly higher than standard screw-compressor elements (F5 class, 98% @ 5 μm) — meeting the stricter intake cleanliness demands of centrifugal compressors and protecting the 185kW unit's precision impeller and diffuser.

Flow and Pressure Drop

• Rated air flow: approx. 25–40 Nm³/min (for 185kW-class centrifugal units)
• Initial pressure drop: approx. 220–300 Pa (clean, at rated flow)
• Operating differential range: 300–550 Pa
• Alarm / terminal resistance: alarm at 650 Pa; terminal at 800 Pa (replacement required)
• Pressure drop vs. energy: every 100 Pa increase in inlet pressure loss raises compressor shaft power by approx. 0.35%

The micro-fiberglass design delivers approximately 40% lower clean pressure drop and approximately 89% higher dust-holding capacity than comparable alternatives, reducing compressor energy consumption and extending replacement intervals.

Dimensions and Installation

• Dimensions: approx. φ420 × φ220 × 380 mm (outer dia. × inner dia. × height)
• Effective filtration area: approx. 12–15 m² (pleated cartridge unfolded area)
• Pleat count / pitch: approx. 200–240 pleats, pitch approx. 6–8 mm
• Mounting interface: flange / end-cap groove type, mates with intake filter housing
• Sealing: polyurethane (PU) foam gasket integrated into the media end frame for seamless, zero-leak fit

Material Construction

• Media: micro-fiberglass
• Media weight: approx. 120–150 g/m²
• Support: inner galvanized metal support mesh + outer protective mesh to prevent media collapse
• End caps: polystyrene frame — lightweight, corrosion-resistant, incinerable
• Gasket: one-piece polyurethane (PU) foam gasket, high elasticity, seamless fit
• Bonding: polyurethane adhesive bonds end caps to media; heat-resistant, no delamination

Operating Conditions

• Operating temperature: continuous −20°C to 80°C; max. 93°C (200°F)
• Relative humidity: ≤95% RH, no condensation
• Collapse pressure resistance: ≥2.8 kPa overall differential
• Features: low initial pressure drop, high dust-holding capacity, extended replacement interval, zero-leak sealing

Service Life and Storage

• Service life: approx. 6,000–8,000 hours (about 8–12 months) under standard conditions; 3,000–4,000 hours in high-dust environments
• Shelf life: 36 months in original sealed packaging, dry, ambient temperature

Standards Referenced

• ISO 5011 — intake filter performance testing (efficiency and dust capacity)
• ISO 16889 — determination of filter beta ratio
• 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)

Maintenance 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
• Replace immediately when the differential-pressure alarm triggers (≥650 Pa)

Installation Steps

1. Shut down and isolate: switch off the compressor main power, apply lockout/tagout (LOTO), confirm the unit has fully stopped and is depressurized.
2. Open the intake filter housing: release the housing latches or bolts and remove the cover or access door.
3. Remove the old element: pull the old ATN18504 straight up; check whether the gasket has been left behind in the housing groove.
4. Clean the housing: wipe the housing interior and sealing surface with a clean cloth — no dust, oil or foreign matter.
5. Inspect the new element: verify part number ATN18504, check media for damage, pleat deformation and gasket aging.
6. Install the new element: seat it vertically in the housing center so the gasket contacts the sealing surface evenly — no tilting or twisting.
7. Reassemble the housing: refit the cover and tighten bolts or latches evenly to ensure a gap-free seal.
8. Start up and leak-check: run the compressor, listen for air leakage at the intake filter, and confirm the differential-pressure gauge returns to normal (initial drop should be 220–300 Pa).

FAQ for Buyers

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

Q2: How is it different from a standard screw-compressor air filter?
Centrifugal compressors require far cleaner intake air. The ATN18504 uses micro-fiberglass media (99.5% @ 3.0 μm), while standard screw-compressor elements are typically F5 class (98% @ 5 μm). Using the wrong element can cause impeller fouling, loss of dynamic balance and costly impeller damage.

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

Q4: Is the ATN18504 a genuine part?
Yes — the ATN18504 is a genuine Ingersoll Rand part manufactured to Ingersoll Rand global technical standards and fits the original intake filter housing.

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

Related Part Numbers

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

Ordering and Support

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 so we can check the original parts diagram and confirm current supply. Request a quotation, datasheet or sample — export packing and documentation prepared per order.