Ingersoll Rand ATN18504 Air Filter Element | 185kW Centrifugal Compressor

Product Overview

The ATN18504 air filter element is a genuine Ingersoll Rand inlet filter designed for ATN-series 185kW oil-free centrifugal compressors. Its micro-fiberglass media captures 99.5% of particles at 3.0 μm, blocking dust and particulate matter from the compression chamber to protect high-speed impellers and diffusers, supporting ISO 8573-1 Class 0 oil-free air quality.

As a core spare part of the Ingersoll Rand centrifugal compressor inlet filtration system, the ATN18504 is manufactured to Ingersoll Rand global technical standards, offering low initial pressure drop, high dust-holding capacity, and extended service life to reduce energy consumption and maintenance downtime.

Technical Specifications

Filtration Performance

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

The micro-fiberglass media achieves 99.5% efficiency at 3.0 μm, exceeding standard screw compressor filters (F5, 98% @ 5 μm) to meet the stringent inlet cleanliness requirements of 185kW centrifugal units.

Flow and Resistance

• Rated air flow: approx. 25–40 Nm³/min (for 185kW centrifugal units)
• Initial pressure drop: approx. 220–300 Pa (clean, rated flow)
• Operating differential pressure range: 300–550 Pa
• Alarm / final resistance: 650 Pa alarm; 800 Pa final (replace immediately)
• Energy impact: every 100 Pa increase in inlet pressure loss raises compressor shaft power by approx. 0.35%

Compared with typical competitors, the ATN18504 offers approximately 40% lower clean pressure drop and 89% higher dust-holding capacity, reducing energy consumption and extending replacement intervals.

Dimensions and Installation

• Dimensions: approx. φ420 × φ220 × 380 mm (OD × ID × H)
• Effective filtration area: approx. 12–15 m² (pleated element)
• Pleats: approx. 200–240, pleat spacing approx. 6–8 mm
• Mounting: flange / end-cap slot interface, mates with inlet filter housing
• Sealing: polyurethane (PU) foam gasket integrated into the end frame for zero-leak fit

Materials of Construction

• Media: micro-fiberglass
• Media weight: 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
• Seal: one-piece polyurethane (PU) foam gasket, high elasticity, seamless fit
• Bonding: polyurethane adhesive, heat-resistant, no delamination

Operating Conditions

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

Service Life and Maintenance

• 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

Compliance Standards

• 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)

Installation and Maintenance

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: Turn off main power, apply LOTO, confirm the unit is fully stopped and depressurized.
2. Open the inlet filter housing: Release the housing latches or bolts and remove the cover or access door.
3. Remove the old element: Pull the old ATN18504 element straight up and check for any remaining gasket 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.
5. Inspect the new element: Verify part number ATN18504, check media for damage, pleat deformation, and gasket aging.
6. Install the new element: Place vertically into the housing center, ensuring the gasket seats evenly without distortion.
7. Reassemble the housing: Refit the cover and tighten bolts or latches evenly for a gap-free seal.
8. Start up and leak-check: Run the compressor, listen for air leaks at the inlet filter, and confirm the differential pressure gauge reads normal (initial drop 220–300 Pa).

Frequently Asked Questions

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 unsure, provide the compressor serial number for accurate matching.

Q2: How is the ATN18504 different from standard screw compressor air filters?

A: Centrifugal compressors require much higher inlet cleanliness. The ATN18504 uses micro-fiberglass media (99.5% @ 3.0 μm), while standard screw compressor filters are only F5 (98% @ 5 μm). Using a standard filter can cause impeller fouling, imbalance, and 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; (2) the 6,000–8,000 hour or 8–12 month interval is reached; (3) visual inspection shows media damage or gasket aging/deformation.

Q4: Is the ATN18504 a genuine original part?

A: The ATN18504 is a genuine Ingersoll Rand original spare part, manufactured to Ingersoll Rand global technical standards and compatible with original inlet filter housings.

Q5: Is one filter element sufficient?

A: Centrifugal compressor inlet filter assemblies may use one or multiple elements. The quantity depends on the filter assembly specification; please provide the serial number for confirmation.

Related Part Numbers

• ATS11057 — Air filter element for ATS-series 110kW centrifugal compressors
• ATN09504 — Air filter element for ATN-series 95kW centrifugal compressors
• ATN10504 — Air filter element for ATN-series 105kW centrifugal compressors
• ATN72018 — Air filter element for ATN-series 720kW large centrifugal compressors
• A29504376 — Pre-filter element for oil-free screw compressors
• A29504406 — Main filter element for oil-free screw compressors (H11 grade)
• A11516974 — Panel filter element for medium centrifugal compressors
• A13368674 — Panel filter element for large centrifugal compressors

Note: Specifications are based on Ingersoll Rand official centrifugal compressor filtration system technical data and industrial filtration standards. For 100% accurate matching, please provide the complete compressor serial number so we can verify the original parts diagram and confirm current supply information.