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

Product Overview

The ATN18504 air filter element is a genuine Ingersoll Rand inlet filtration replacement part 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 matter from entering the compression chamber and protecting high-speed precision impellers and diffusers. This supports the Class 0 oil-free air quality requirement of the ATN platform.

As a core consumable in the centrifugal compressor inlet filtration system, the ATN18504 is produced to Ingersoll Rand global technical standards, offering low initial pressure drop, high dust-holding capacity and extended service intervals that help lower energy consumption and reduce unplanned downtime.

Key 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 airflow and terminal resistance
• Beta ratio: β₃.₀ ≥ 200

The micro-fiberglass construction delivers 99.5% efficiency at 3.0 μm, significantly above standard rotary-screw compressor elements (F5, 98% @ 5 μm), meeting the higher inlet cleanliness demands of centrifugal compressor impellers and diffusers.

Flow and Resistance

• Rated airflow: approx. 25–40 Nm³/min (185kW-class centrifugal units)
• Initial pressure drop: approx. 220–300 Pa (clean, rated airflow)
• Operating differential range: 300–550 Pa
• Alarm / terminal resistance: alarm at 650 Pa; replace at 800 Pa
• Energy relationship: each additional 100 Pa inlet pressure loss increases compressor shaft power by approx. 0.35%

Construction and Dimensions

• Dimensions: approx. φ420 × φ220 × 380 mm (OD × ID × height)
• Effective filtration area: approx. 12–15 m² (pleated media)
• Pleats: approx. 200–240, pleat spacing approx. 6–8 mm
• Mounting: flange / end-cap groove interface to filter housing
• Sealing: polyurethane (PU) foamed gasket integrated into the end frame for seamless, leak-free fit
• Media: micro-fiberglass, approx. 120–150 g/m²
• Support: inner galvanized metal mesh plus outer protective mesh
• End caps: polystyrene frame, lightweight, corrosion-resistant, incinerable
• Bonding: polyurethane adhesive, heat-resistant, non-debonding

Operating Conditions and Service Life

• 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
• 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 sealed original packaging, cool and dry

Standards Referenced

• ISO 5011 — inlet air 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 performance testing
• GB/T 14295 — air filters
• GB/T 6165 — air filter performance test methods

Replacement 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: switch off main power, apply lockout/tagout (LOTO), confirm the unit has stopped and pressure is released.
2. Open the filter housing: release clamps or bolts and remove the cover or access door.
3. Remove the old element: pull the old ATN18504 straight up; check whether the gasket remains in the housing groove.
4. Clean the housing interior: wipe the inner wall and sealing face free of dust, oil and 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: seat it vertically in the housing center, ensuring the gasket contacts the sealing face evenly without skew or twisting.
7. Refit the housing: reinstall 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 pressure drop 220–300 Pa).

FAQ

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

Q2: How does it differ from a standard rotary-screw air filter element?
A: Centrifugal compressors require higher inlet cleanliness. The ATN18504 uses micro-fiberglass media rated 99.5% @ 3.0 μm, versus F5 (98% @ 5 μm) for typical screw compressor elements. Using a standard element can lead to impeller fouling, balance loss and costly impeller damage.

Q3: How do I know when to replace the element?
A: Replace when operating differential pressure reaches the 650 Pa alarm, when the 6,000–8,000 hour or 8–12 month interval is reached, or when inspection reveals damaged media or a hardened, deformed gasket.

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

Q5: Is one element sufficient?
A: Centrifugal compressor inlet filter assemblies may use single or multiple elements depending on the assembly specification. Provide the serial number and we will confirm the correct configuration.

Related Part Numbers

• ATS11057 — air filter element, ATS-series centrifugal compressors (110kW class)
• ATN09504 — air filter element, ATN-series centrifugal compressors (95kW class)
• ATN10504 — air filter element, ATN-series centrifugal compressors (105kW class)
• ATN72018 — air filter element, large ATN-series centrifugal compressors (720kW class)
• A29504376 — pre-filter element, oil-free screw compressors
• A29504406 — main filter element, oil-free screw compressors (H11 class)
• A11516974 — panel-type filter element, medium centrifugal compressors
• A13368674 — panel-type filter element, large centrifugal compressors

Ordering and Matching

To confirm 100% compatibility, provide the complete compressor serial number so we can reference the original parts diagram and confirm current availability. Export packing, consolidated orders and OEM/ODM support are available on request. Contact us for a quotation, datasheet or sample arrangement.