Ingersoll Rand ATN18504 Air Filter Element | 185kW Centrifugal Compressor

Product Overview

The ATN18504 air filter element is a genuine Ingersoll Rand inlet filtration component engineered for ATN-series 185kW oil-free centrifugal compressors. Built with micro-fiberglass media, it achieves over 99.5% filtration efficiency at 3.0 μm, blocking dust and particulate matter from entering the compression chamber to protect the high-speed precision impeller and diffuser, supporting ISO 8573-1 Class 0 oil-free air quality.

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

Key Specifications

• Part number: ATN18504
• Brand: Ingersoll Rand
• Component: Air filter element
• Product line: CC (centrifugal compressor)
• Compatible machines: ATN-series oil-free centrifugal compressors, 185kW range
• Unit of measure: EA
• Availability: Normally stocked

Filtration Performance

• Filtration rating: 3.0 μm
• 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: β₃.₀ ≥ 200

The micro-fiberglass media captures 99.5% of particles at 3.0 μm and above — significantly higher than standard screw compressor filters (F5, 98% @ 5 μm) — meeting the stricter inlet cleanliness demands of centrifugal compressors and protecting the 185kW unit's precision impeller and diffuser.

Flow & 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 range: 300–550 Pa
• Alarm / final resistance: alarm at 650 Pa; final at 800 Pa (must replace)
• Pressure drop vs. energy: each additional 100 Pa inlet loss raises compressor shaft power by approx. 0.35%

The micro-fiberglass design keeps clean pressure drop roughly 40% lower and dust holding capacity about 89% higher than comparable alternatives, reducing running energy costs and extending replacement intervals.

Construction & Materials

• 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
• Installation interface: flange / end-cap slot type, mates with inlet filter housing
• Seal: polyurethane (PU) foam gasket integrated into the end frame for zero-leak fit
• Media: micro-fiberglass, approx. 120–150 g/m²
• Support: galvanized inner support mesh + outer protective mesh
• End caps: polystyrene frame — lightweight, corrosion-resistant, incinerable
• Bonding: polyurethane adhesive, heat-resistant

Operating Conditions & Service Life

• Temperature: continuous -20°C to 80°C; peak 93°C (200°F)
• Relative humidity: ≤95% RH, no condensation
• Collapse 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 original sealed packaging, dry ambient storage

Standards referenced: ISO 5011, ISO 16889, ISO 16890 / EN 779, ISO 29463, GB/T 14295, GB/T 6165.

Maintenance & 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/tag out (LOTO) the compressor; confirm full stop and depressurization.
2. Open the inlet filter housing — release clamps or bolts, remove cover or access door.
3. Remove the old ATN18504 element vertically; check the housing groove for residual gasket material.
4. Clean the housing interior and sealing face — no dust, oil or foreign matter.
5. Inspect the new element: verify part number ATN18504, check media, pleats and gasket condition.
6. Install the new element vertically in the housing center; ensure the gasket seats evenly without distortion.
7. Refit the cover; tighten bolts or clamps evenly for a gap-free seal.
8. Start up and leak-check; confirm differential pressure returns to normal (initial drop 220–300 Pa).

FAQ

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

Q2: How does it differ from a standard screw compressor filter?
A: Centrifugal compressors require far cleaner inlet air. The ATN18504 uses micro-fiberglass media (99.5% @ 3.0 μm) versus F5 (98% @ 5 μm) on standard screw filters. Using a lower-grade filter can cause impeller fouling, imbalance and costly impeller damage.

Q3: When should the element be replaced?
A: Replace when differential pressure reaches the 650 Pa alarm; at 6,000–8,000 hours or 8–12 months; or when visual inspection shows damaged media or a hardened/deformed gasket.

Q4: Is ATN18504 a genuine part?
A: Yes — it is a genuine Ingersoll Rand part manufactured to global technical standards and fits the original inlet filter housing.

Q5: Is one element sufficient?
A: Inlet filter assemblies may use one or multiple elements. Provide the compressor serial number to confirm the required quantity.

Related Part Numbers

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

Note: Technical parameters above are based on Ingersoll Rand centrifugal compressor filtration 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 supply. Request a quotation or datasheet — OEM/ODM and export packing available on request.