Ingersoll Rand ATN18504 Air Filter Element

ATN18504 is a genuine Ingersoll Rand inlet air 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, preventing 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 inlet filtration system, 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 Models: ATN-series oil-free centrifugal compressors, 185kW range
• 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 to terminal resistance
• Beta Ratio: β₃.₀ ≥ 200

Micro-fiberglass media achieves 99.5% efficiency at 3.0 μm, exceeding standard screw compressor inlet filters (F5, 98% @ 5 μm) and meeting the high inlet cleanliness demands of centrifugal compressors.

Flow and Pressure Drop

• Rated Air Flow: approx. 25–40 Nm³/min (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 (replace immediately)
• Energy Impact: Each 100 Pa increase in inlet pressure loss raises compressor shaft power by approx. 0.35%

Dimensions and Installation

• Dimensions: approx. φ420 × φ220 × 380 mm (OD × ID × height)
• Effective Filter Area: approx. 12–15 m² (pleated cartridge)
• Pleats: approx. 200–240 pleats, 6–8 mm pitch
• Mounting: Flange / end-cap groove interface to filter housing
• Sealing: Polyurethane (PU) foam gasket integrated into the end frame for zero-leak fit

Construction Materials

• Media: Micro-fiberglass
• Media Weight: approx. 120–150 g/m²
• Support: Inner galvanized metal screen + outer protective mesh
• End Caps: Polystyrene frame, lightweight, corrosion-resistant, incinerable
• Seal: One-piece polyurethane (PU) foam gasket
• Bonding: Polyurethane adhesive, heat-resistant, no delamination

Operating Conditions

• Temperature: Continuous -20°C to 80°C; max 93°C (200°F)
• Relative Humidity: ≤95% RH, no condensation
• Collapse Pressure: ≥2.8 kPa differential
• Features: Low initial pressure drop, high dust-holding capacity, extended change interval, zero-leak seal

Service Life and Storage

• 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 original sealed packaging, dry, ambient temperature

Standards Referenced

• ISO 5011 — Inlet air 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 differential pressure alarm triggers (≥650 Pa)

Installation Steps

1. Shut down and lock out: Isolate main power, apply LOTO, confirm the unit has stopped and pressure is released.
2. Open the inlet filter housing: Release clamps or bolts and remove the cover or access door.
3. Remove the old element: Pull the used ATN18504 straight up; check for any gasket residue in the housing groove.
4. Clean the housing: Wipe the interior and sealing surface free of dust, oil and debris.
5. Inspect the new element: Verify part number ATN18504, check media integrity, pleat shape and gasket condition.
6. Install the new element: Seat vertically in the housing center; ensure the gasket contacts the sealing surface evenly without twisting.
7. Reassemble: Refit 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 filter, and confirm the differential gauge returns to normal (initial drop should be 220–300 Pa).

FAQ for Buyers

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

Q2: How is ATN18504 different from a standard screw compressor inlet filter?
A: Centrifugal compressors require much higher inlet cleanliness. ATN18504 uses micro-fiberglass media rated 99.5% @ 3.0 μm, compared with F5 (98% @ 5 μm) for typical screw compressor filters. Using a lower-grade element can lead to impeller fouling, imbalance and costly impeller damage.

Q3: When should the element be replaced?
A: Replace when: (1) differential pressure reaches the 650 Pa alarm; (2) the 6,000–8,000 hour or 8–12 month interval is reached; or (3) visual inspection shows damaged media or a hardened/deformed gasket.

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 inlet filter housing.

Q5: How many elements do I need?
A: Centrifugal compressor inlet filter assemblies may use one or multiple elements depending on the housing specification. Provide the compressor serial number and we will confirm the configuration.

Related Part Numbers

• ATS11057 — Air filter element, ATS-series centrifugal compressor (110kW)
• ATN09504 — Air filter element, ATN-series centrifugal compressor (95kW)
• ATN10504 — Air filter element, ATN-series centrifugal compressor (105kW)
• ATN72018 — Air filter element, large ATN-series centrifugal compressor (720kW)
• A29504376 — Pre-filter element, oil-free screw compressor
• A29504406 — Main filter element, oil-free screw compressor (H11 class)
• A11516974 — Filter element, medium centrifugal compressor (panel type)
• A13368674 — 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 full compressor serial number and we will check the OEM parts diagram and confirm current supply. Request a quotation or datasheet for export pricing and lead time.