Ingersoll Rand ATN18504 Air Filter Element

Product Overview

ATN18504 is a genuine Ingersoll Rand intake air filter element engineered for ATN-series 185kW oil-free centrifugal compressors. The micro-fiberglass filtration media captures 99.5% of particles at 3.0 μm, preventing dust and particulate ingress into the compression chamber. This protects the high-speed precision impeller and diffuser from erosion and maintains 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. It combines low initial pressure drop, high dust-holding capacity, and long service life to 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 rated flow and final resistance
• Beta ratio β: β₃.₀ ≥ 200

The micro-fiberglass media achieves 99.5% efficiency at 3.0 μm — significantly higher than standard screw compressor air filters (F5, 98% @ 5 μm) — meeting the stringent intake cleanliness requirements of 185kW centrifugal compressor packages.

Flow and Pressure Drop

• Rated flow: approx. 25–40 Nm³/min (for 185kW class centrifugal compressors)
• Initial pressure drop: approx. 220–300 Pa (clean, at rated flow)
• Operating differential range: 300–550 Pa
• Alarm / final resistance: alarm at 650 Pa; final at 800 Pa (replace immediately)
• 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 aftermarket elements, reducing energy use and extending replacement intervals.

Dimensions and Installation

• Dimensions: approx. φ420 × φ220 × 380 mm (OD × ID × height)
• Effective filtration area: approx. 12–15 m² (pleated media)
• Pleats: approx. 200–240 pleats, 6–8 mm pitch
• Mounting interface: flange or end-cap groove, mates with intake filter housing
• Sealing: polyurethane (PU) foam gasket integrated into the end frame for zero-leak fit

Materials of Construction

• 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
• Gasket: one-piece polyurethane (PU) foam, high elasticity, seamless seal
• Bonding: polyurethane adhesive, high-temperature resistant

Operating Conditions

• Continuous operating temperature: −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, 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

• 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 filters and filter media for removing particles from air
• GB/T 14295 — Air filters
• GB/T 6165 — Methods of testing air filter performance: efficiency and resistance

Maintenance and Installation

Replacement Schedule

• Standard conditions: every 6,000–8,000 hours or 8–12 months, whichever comes first
• High-dust environments (mining, construction materials, cement, steel): every 3,000–4,000 hours
• Differential pressure alarm: replace immediately when reaching 650 Pa

Installation Steps

1. Shut down and lock out: turn off main power, apply LOTO, confirm the unit has fully stopped and pressure is released.
2. Open the intake filter housing: release latches or bolts and remove the cover or access door.
3. Remove the old element: pull the used ATN18504 straight up; check whether the gasket remains 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 the new element: verify part number ATN18504, check media for damage, pleat deformation, or gasket aging.
6. Install the new element: seat it vertically in the housing center, ensuring the gasket contacts the sealing surface evenly without skew or twist.
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 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 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 higher intake cleanliness than screw compressors. The ATN18504 uses micro-fiberglass media rated 99.5% @ 3.0 μm, while standard screw compressor filters are typically F5 (98% @ 5 μm). Using an inferior filter can cause impeller fouling, imbalance, and costly impeller damage.

Q3: How do I know when to replace the air filter?
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; or (3) visual inspection shows media damage or gasket aging/deformation.

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

Q5: Is one filter element sufficient?
A: Centrifugal compressor intake filter assemblies may use one or multiple elements. The exact quantity depends on the intake filter assembly specification. Please provide the compressor serial number for confirmation.

Related Parts

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

Note: Technical parameters above are compiled from Ingersoll Rand centrifugal compressor filtration system specifications 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 availability.