Ingersoll Rand ATN18504 Air Filter Element

The ATN18504 air filter element is a genuine Ingersoll Rand intake filter element engineered for ATN series 185kW oil-free centrifugal compressors. Built with micro-fiberglass media, it captures 99.5% of particles at 3.0 μm, blocking dust and particulate from entering the compression chamber and protecting the high-speed impeller and diffuser from erosion. This supports ISO 8573-1 Class 0 oil-free air quality.

As a core consumable in the centrifugal compressor intake filtration system, the ATN18504 is manufactured to Ingersoll Rand global technical standards and offers low initial pressure drop, high dust-holding capacity and extended service life — helping operators reduce energy consumption and unplanned downtime.

Key Specifications

• Part Number: ATN18504
• Brand: Ingersoll Rand
• Component: Air filter element
• Product Line: CC (centrifugal compressor)
• Compatible Machines: ATN series oil-free centrifugal compressors, 185kW range
• Unit of Measure: EA
• Availability: Normally stocked

Filtration and Flow 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 and terminal resistance
• Beta ratio: β₃.₀ ≥ 200
• 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 pressure range: 300–550 Pa
• Alarm / terminal resistance: alarm at 650 Pa; terminal at 800 Pa (replace immediately)
• Pressure drop vs. energy: every 100 Pa increase in intake loss raises compressor shaft power by approx. 0.35%

The micro-fiberglass media design delivers initial pressure drop approximately 40% lower than comparable elements and dust-holding capacity approximately 89% higher, reducing energy use and extending replacement intervals.

Construction and Installation Data

• Dimensions: approx. φ420 × φ220 × 380 mm (outer diameter × inner diameter × height)
• Effective filtration area: approx. 12–15 m² (pleated cartridge)
• Pleats: approx. 200–240 pleats, approx. 6–8 mm pitch
• Mounting: flange/end-cap groove interface to intake filter housing
• Sealing: polyurethane (PU) foam gasket integrated into the end frame for zero-leak fit
• Media: micro-fiberglass, approx. 120–150 g/m²
• Support: inner galvanized metal mesh + outer protective mesh to prevent media collapse
• End caps: polystyrene frame, lightweight, corrosion-resistant, incinerable
• Bonding: polyurethane adhesive, high-temperature resistant
• Operating temperature: continuous -20°C to 80°C; peak 93°C (200°F)
• Relative humidity: ≤95% RH, no condensation
• Collapse pressure resistance: ≥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 original packaging, dry ambient conditions

Standards referenced: ISO 5011, ISO 16889, ISO 16890 / EN 779, ISO 29463, GB/T 14295, GB/T 6165.

Maintenance and Installation Steps

Replacement interval

• 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 differential pressure alarm triggers (≥650 Pa)

Installation

1. Shut down and lock out/tag out (LOTO) the compressor main power; confirm full stop and depressurization.
2. Open the intake filter housing: release latches or bolts, remove cover or access door.
3. Remove the old ATN18504 element vertically; check that no gasket remains in the housing groove.
4. Clean 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 or gasket aging.
6. Install the new element vertically into the housing center; ensure the gasket seats evenly without skew or twist.
7. Refit the cover and tighten bolts or latches evenly for a gap-free seal.
8. Start up and leak-check: listen for air leaks at the intake filter and confirm the differential pressure gauge returns to normal (initial drop should be 220–300 Pa).

Frequently Asked Questions

Q1: Which Ingersoll Rand compressors does ATN18504 fit?
A: 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 confirm the exact match.

Q2: How is ATN18504 different from a standard screw compressor air filter?
A: Centrifugal compressors demand much higher intake cleanliness. ATN18504 uses micro-fiberglass media rated 99.5% @ 3.0 μm, whereas a typical screw compressor element is F5 class (98% @ 5 μm). Using a lower-grade element can cause impeller fouling, imbalance and costly impeller damage.

Q3: How do I know when to replace the element?
A: Replace when: (1) operating differential pressure 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 media damage or gasket aging/deformation.

Q4: Is ATN18504 a genuine part?
A: 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 sufficient?
A: Centrifugal compressor intake filter assemblies may use one or multiple elements. The quantity depends on the intake filter assembly specification; provide the serial number to confirm.

Related Parts

• 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, ATN series large 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 compressor (panel type)
• A13368674 — Air filter element, large centrifugal compressor (panel type)

Note: Specifications above are compiled from Ingersoll Rand centrifugal compressor filtration system technical data and industrial filtration standards. For 100% accurate matching, provide the complete compressor serial number so we can check the original parts diagram and confirm current availability.