Gas Turbine Filter Test System，gas turbine filter pressure drop and efficiency tester

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Test System for testing air intake filter systems for rotary machinery (ISO 29461). The test system for testing air intake filter systems for rotary machinery is based on the well-established filter test system for general air filters (ISO 16890) and extended to fulfil the specifications of ISO 29461.

It was developed with the aim of testing filters with different shapes (filter cartridges, cassette filter, filter with filter bags and plane filter media) using varying test aerosols (salt, oil) under adjustable air conditions (air humidity, temperature) within the test duct. By using the test system the following filter characteristics can be determined: differential pressure curves, dust holding capacity, gravimetric efficiency, fractional efficiency, salt removal efficiency (ISO/AWI 29461-4) and water endurance (ISO 29461-2).

Applications

Testing of gas turbine intake filter systems according to ISO 29461-2 and ISO/AWI 29461-4

Testing of general air filters (ISO 16890. EN 779. ASHRAE 52.2)

Standards

The system complies with:

(1) ISO 29461-1 – Air filter performance, test methods.

(2) ISO 29461-2 – Air filter performance, gas adsorption test.

(3) ISO/AWI 29461-4 – Air filter performance, salt removal efficiency.

(4) ISO 16890-2 – Air filter classification and testing for general air filters.

(5) ISO 16890-3 – Gravimetric efficiency determination.

(6) ISO 16890-4 – Fractional efficiency and dust holding capacity.

(7) ISO/DIS 29461-7 – Gas turbine filter testing guidance.

(8) ISO 12103-1 – Fine test dust (A2) for filter performance.

(9) ASHRAE 52.2 – Air filter testing using airflow and particle size distribution.

(10) EN 779 – Requirements for high-efficiency air filters.

(11) GB/T 12103-1 & GB/T 12103-2 – Test dust and adsorption methods.

(12) GB/T 18801-2015 – Performance testing for air purifiers.

Principle

A defined volume flow rate is sucked through a HEPA intake filter, the attached test duct and the safety filter. The test system is composed of 6 sections: aerosol inlet, upstream measurement, specimen holder, downstream measurement, safety filter and flow rate measurement. The measurement sections are equipped with ports for the aerosol characterization and the determination of the pressure drop.

Technical data

Parameter	Unit	Value
Test flow rate	m³/h	800 … 11.000
Test aerosol	–	DEHS, KCl, Ashrae, ISO 12103-A2 (AC fine), ISO 12103-A4 (AC coarse)
Test specimen dimensions	–	610 × 610 mm (pocket and cassette filters); diameter ≤ 400 mm, length ≤ 1500 mm (filter cartridges)
Differential pressure of test specimen	Pa	max. 2000
Compressed air supply (operating gas/air)	bar	min. 5 (17 m³/h)
Water supply (operating medium)	bar	min. 3
Power supply	–	3 × 400 VAC, 125 A, 50 Hz
Air circulation	%	0 … 100
Sensors (others)	–	Temperature, relative humidity, air pressure
System dimensions (W × H × D)	m	4.6 × 1.7 × 14.0

Features

Circulation mode for control of the test parameters temperature and humidity

Injection of different aerosols (NaCl, KCl, DEHS) into an optimal flow profile

Automated feeding of water droplets and supersaturated vapour

High level of automation, mostly automated test runs with complete operator guiding

Gas-Tight Test Ducts: Ensure accurate particle and gas measurements.

Modular Design: Accommodates different filter types and sizes.

High Automation: Software-driven sequences with automatic data acquisition.

Multi-Medium Testing: Supports various aerosols and pollutant gases.

Standardized Reporting: Automatically generates reports including differential pressure, dust loading, fractional efficiency, and salt removal efficiency.

Environmental Control: Built-in temperature and humidity sensors allow testing under controlled conditions.

Accessories

Accessory / Consumable	Quantity	Description
DEHS Aerosol Generator	1	For fine aerosol particle testing
ASHRAE Dust Generator	1	For standardized dust loading tests
Optical Particle Counters	2	0.2–10 μm, four channels
H14 Air Filter	1	For system calibration
Temperature & Humidity Sensors	2	Monitor test environment
Gas Analyzers	3	Measure NO₂, H₂SO₄, and other gases

Operation Instructions

Safety:

Confirm power, gas, and water connections before testing.

Avoid direct exposure to aerosols and gases; ensure good ventilation.

Wear protective equipment when handling hazardous gases.

Standard-Specific Testing:

The system adjusts test conditions automatically according to ISO 16890. ISO 29461-2. or other relevant standards.

After testing, the system generates standardized reports.

Test Procedure

Preparation:

Select the appropriate filter adapter and install the sample.

Configure test airflow, aerosol concentration, humidity, and temperature per standard requirements.

Testing:

Start the automated system; aerosol and gas injection begins.

The system continuously records differential pressure, dust loading, and fractional efficiency.

Data Analysis & Reporting:

After testing, the software analyzes collected data.

Generate reports including pressure curves, dust loading, fractional efficiency, and salt removal efficiency.

Maintenance Information

Regularly inspect aerosol and gas generators for proper operation.

Calibrate sensors periodically for accuracy.

Keep the system clean and free of particulate build-up.

Ensure all safety interlocks and ventilation systems are functional.

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