Ingersoll Rand ATN18504 Air Filter Element | ATN 185kW Centrifugal Compressor

Product Overview

The ATN18504 air filter element is a genuine Ingersoll Rand intake filter designed specifically for ATN-series 185kW oil-free centrifugal compressors. Its micro-fiberglass media achieves over 99.5% filtration efficiency for particles 3.0 μm and larger, blocking dust and particulate matter from entering the compression chamber. This protects the high-speed precision impeller and diffuser from wear and helps maintain ISO 8573-1 Class 0 oil-free air quality.

As a core spare part in the centrifugal compressor intake 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 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 (medium-high efficiency, per EN 779 / ISO 16890)
• Dust-holding capacity: Approx. 3.5 kg at rated flow and final resistance
• Beta ratio β: β₃.₀ ≥ 200

The micro-fiberglass media delivers 99.5% efficiency at 3.0 μm, significantly higher than standard screw compressor filters (F5, 98% @ 5μm), meeting the stringent 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, rated flow)
• Operating differential pressure range: 300–550 Pa
• Alarm / final resistance: Alarm at 650 Pa; final at 800 Pa (must replace)
• Pressure drop vs. energy: Every 100 Pa increase in intake pressure loss raises compressor shaft power by approx. 0.35%

The ATN18504's micro-fiberglass design delivers approximately 40% lower clean pressure drop and 89% higher dust-holding capacity than comparable alternatives, reducing energy consumption and extending replacement intervals.

Dimensions and Installation

• Dimensions: Approx. φ420 × φ220 × 380 mm (OD × ID × height)
• Effective filtration area: Approx. 12–15 m² (pleated cartridge)
• Pleats / pleat spacing: Approx. 200–240 pleats, 6–8 mm spacing
• Mounting interface: Flange or end-cap groove, mates with intake filter housing
• Sealing: Polyurethane (PU) foam gasket integrated into the end frame for seamless, leak-free fit

Materials of Construction

• Media: Micro-fiberglass
• Media weight: Approx. 120–150 g/m²
• Support: Galvanized metal inner support mesh + outer protective mesh to prevent media collapse
• End caps: Polystyrene frame — lightweight, corrosion-resistant, incinerable
• Gasket: Polyurethane (PU) integrally foamed gasket, high elasticity, seamless fit
• Adhesive: Polyurethane bonding for end caps and media, high-temperature 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 (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 conditions

Standards

• ISO 5011 — Inlet air cleaning equipment for internal combustion engines and compressors: performance testing
• ISO 16889 — Hydraulic fluid power filters: multi-pass method for evaluating filtration performance
• ISO 16890 / EN 779 — Air filters for general ventilation: classification
• ISO 29463 — High-efficiency air filters (HEPA and ULPA): performance testing
• GB/T 14295 — Air filters
• GB/T 6165 — Methods for testing air filter performance (efficiency and resistance)

Maintenance and Installation

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 Steps

1. Shut down and lock out: Turn off main power, apply LOTO, confirm the unit has fully stopped and depressurized.
2. Open the intake filter housing: Release clamps or bolts and remove the cover or access door.
3. Remove old element: Pull out the old ATN18504 vertically; check for any gasket residue in the housing groove.
4. Clean the housing interior: Wipe the inner walls and sealing surface with a clean cloth — no dust, oil, or foreign matter.
5. Inspect new element: Verify part number ATN18504, check media for damage, pleat deformation, and gasket aging.
6. Install new element: Place vertically into the housing center, ensuring the gasket seats evenly on the sealing surface without skew or twist.
7. Reassemble housing: Replace cover, 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 intake filter, and confirm the differential pressure gauge reads normal (initial drop should be 220–300 Pa).

Frequently Asked Questions

Q1: Which Ingersoll Rand compressors does 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 precise matching.

Q2: How is ATN18504 different from a standard screw compressor air filter?
A: Centrifugal compressors require much higher intake cleanliness. The ATN18504 uses micro-fiberglass media (99.5% @ 3.0μm), while standard screw compressor filters are typically F5 (98% @ 5μm). Using a standard filter can cause dust buildup on the impeller, disrupt dynamic balance, and lead to costly impeller wear or failure.

Q3: How do I know when to replace the air filter?
A: Replace when: (1) operating differential pressure reaches the alarm value of 650 Pa; (2) the 6,000–8,000 hour or 8–12 month interval is reached; or (3) visual inspection reveals media damage or gasket aging/deformation.

Q4: Is ATN18504 a genuine original part?
A: Yes, ATN18504 is a genuine Ingersoll Rand original spare part, manufactured to Ingersoll Rand global technical standards and compatible with original intake filter housings.

Q5: Is one filter element enough?
A: Centrifugal compressor intake filters may use single or multiple elements. The quantity depends on the intake filter assembly specification — provide the serial number to confirm.

Related Part Numbers

Part Number	Name	Description
ATS11057	Air filter element	ATS-series centrifugal compressor intake filter (110kW class)
ATN09504	Air filter element	ATN-series centrifugal compressor intake filter (95kW class)
ATN10504	Air filter element	ATN-series centrifugal compressor intake filter (105kW class)
ATN72018	Air filter element	ATN-series large centrifugal compressor intake filter (720kW class)
A29504376	Air filter element	Oil-free screw compressor pre-filter (coarse)
A29504406	Air filter element	Oil-free screw compressor main filter (H11 class)
A11516974	Air filter element	Medium centrifugal compressor filter (panel type)
A13368674	Air filter element	Large centrifugal compressor filter (panel type)

Note: Technical parameters are based on Ingersoll Rand official centrifugal compressor filtration system specifications 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.