Ingersoll Rand ATN18504 Air Filter Element

Product Overview

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

As a core consumable in the Ingersoll Rand centrifugal compressor inlet filtration system, the ATN18504 is manufactured to Ingersoll Rand global technical standards. It combines low initial pressure drop, high dust-holding capacity and long service life to help operators reduce energy consumption and unplanned downtime.

Technical Specifications

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 terminal resistance under rated flow
• Beta ratio: β₃.₀ ≥ 200

The micro-fiberglass media delivers 99.5% efficiency at 3.0 μm — significantly higher than standard screw compressor air filters (F5, 98% @ 5 μm) — meeting the stringent inlet air cleanliness demands of centrifugal compressors and protecting the precision impeller and diffuser of 185kW units.

Flow and Resistance

• Rated flow: approx. 25–40 Nm³/min (suitable for 185kW-class centrifugal units)
• Initial pressure drop: approx. 220–300 Pa (clean, rated flow)
• Operating differential 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 inlet pressure loss raises compressor shaft power by approx. 0.35%

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

Dimensions and Installation

• Dimensions: approx. φ420 × φ220 × 380 mm (outer diameter × inner diameter × height)
• Effective filtration area: approx. 12–15 m² (pleated cartridge expanded area)
• Pleats / pleat spacing: approx. 200–240 pleats, spacing approx. 6–8 mm
• Mounting interface: flange / end-cap slot type, mating with the inlet filter housing
• Sealing: polyurethane (PU) foam gasket integrated into the end frame for seamless, zero-leak fit

Materials of Construction

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

Operating Conditions

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

Service Life and Maintenance

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

Standards

• ISO 5011: inlet air filter performance testing (efficiency and dust-holding capacity)
• ISO 16889: determination of beta ratio for hydraulic filters
• ISO 16890 / EN 779: classification of general ventilation air filters
• 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 environments (mining, construction materials, cement, steel, etc.): 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 main power, apply lockout/tagout (LOTO), confirm the unit has fully stopped and depressurized.
2. Open the inlet filter housing: release the housing clips or bolts and remove the cover or access door.
3. Remove the old element: pull the old ATN18504 element straight up; check whether the gasket remains in the housing groove.
4. Clean the housing interior: wipe the inner walls and sealing surfaces with a clean cloth; ensure no dust, oil or foreign matter remains.
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: place it vertically in the housing center; ensure the gasket seats evenly on the sealing surface without skewing or twisting.
7. Reassemble the housing: refit the cover and tighten bolts or clips evenly to ensure a gap-free seal.
8. Start up and leak-check: run the unit, listen for air leaks at the inlet filter and confirm the differential pressure gauge reads normal (initial pressure drop should be 220–300 Pa).

FAQ

Q1: Which Ingersoll Rand compressors does the ATN18504 fit?
A: The ATN18504 is designed for Ingersoll Rand 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 the ATN18504 different from a standard screw compressor air filter?
A: Centrifugal compressors require much cleaner inlet air than screw compressors. The ATN18504 uses micro-fiberglass high-efficiency media (99.5% @ 3.0 μm), while standard screw compressor filters are only F5 class (98% @ 5 μm). Using a standard filter can cause impeller fouling, imbalance and even costly impeller damage.

Q3: How do I know when to replace the air filter 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 reveals media damage or a hardened, deformed gasket.

Q4: Is the ATN18504 a genuine original part?
A: The ATN18504 is a genuine Ingersoll Rand part manufactured to Ingersoll Rand global technical standards, designed to fit original Ingersoll Rand inlet filter housings.

Q5: Is one filter element enough?
A: Centrifugal compressor inlet filters may use single or multiple elements. The quantity depends on the inlet filter assembly specification. Please provide the serial number for confirmation.

Related Part Numbers

• ATS11057 — air filter element, ATS series centrifugal compressors (110kW class)
• ATN09504 — air filter element, ATN series centrifugal compressors (95kW class)
• ATN10504 — air filter element, ATN series centrifugal compressors (105kW class)
• ATN72018 — air filter element, ATN series large centrifugal compressors (720kW class)
• 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: The technical data above is compiled from Ingersoll Rand centrifugal compressor filtration system specifications and industrial filtration standards. For 100% accurate fitment, provide the complete compressor serial number and we will check the original parts diagram and confirm current availability.