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

Product Overview

The ATN18504 air filter element is a genuine Ingersoll Rand intake filter element engineered specifically 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 entering 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 spare part in the Ingersoll Rand centrifugal compressor intake filtration system, the ATN18504 is manufactured to Ingersoll Rand global technical standards. It offers low initial pressure drop, high dust-holding capacity, and extended service life — helping operators reduce energy consumption and unscheduled 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, final resistance)
• Beta ratio β: β₃.₀ ≥ 200

The micro-fiberglass media achieves 99.5% efficiency at 3.0 μm — well above standard rotary screw compressor filters (F5, 98% @ 5 μm) — meeting the stringent intake cleanliness requirements of centrifugal compressors and protecting the precision impeller and diffuser of 185kW units.

Flow and Pressure Drop

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

The 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: 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 seamless, leak-free fit

Construction Materials

• 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 for high-temperature resistance

Operating Limits

• Operating temperature: continuous -20°C to 80°C; peak 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, long service 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 conditions

Standards

• ISO 5011 — intake filter performance testing (efficiency and dust capacity)
• ISO 16889 — filter beta ratio determination
• ISO 16890 / EN 779 — general ventilation air filter classification
• ISO 29463 — high-efficiency air filter testing
• GB/T 14295 — air filters
• GB/T 6165 — air filter performance test methods (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 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: disconnect main power, apply LOTO, confirm the unit has stopped and pressure is released.
2. Open the filter housing: release latches or bolts and remove the cover or access door.
3. Remove old element: pull the old ATN18504 element straight up; 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 debris.
5. Inspect new element: verify part number ATN18504; check media for damage, pleats for deformation, and gasket for aging.
6. Install new element: insert vertically into the housing center, ensuring the gasket seats evenly without skew or twist.
7. Reassemble housing: refit the cover, 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 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 you are unsure, provide your compressor serial number and we will match it precisely.

Q2: How is the ATN18504 different from a standard rotary screw compressor filter?
A: Centrifugal compressors require much cleaner intake air. The ATN18504 uses micro-fiberglass media (99.5% @ 3.0 μm), whereas standard screw compressor filters are typically 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 filter element?
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 media damage or gasket aging/deformation.

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

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

Related Parts

• ATS11057 — Air filter element for ATS-series centrifugal compressors (110kW class)
• 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 data above is based on Ingersoll Rand centrifugal compressor filtration system specifications and industrial filtration standards. For 100% accurate matching, provide the complete compressor serial number so we can verify the original parts diagram and confirm current supply.