501F/G Technical Presentation - donaldsongts.com · It is very important to understand your inlet,...
Transcript of 501F/G Technical Presentation - donaldsongts.com · It is very important to understand your inlet,...
501F/G Technical Presentation
Evaluating GT Inlet Filtration Options and Understanding
Filtration Efficiency Ratings
Presented By: Barry Link
Manager, GTS Aftermarket
Donaldson Company, Inc.
11:05 AM – 11:35 AM, Room #2
Monday February 13, 2012
Presentation Objectives
1. Review the key factors that should be
understood when evaluating GT inlet filters.
2. Explain the filtration efficiency ratings for
today’s accepted standards - ASHRAE 52.2
- EN779
- EN1822
3. Leave you with a reference tool to help
remember key points from each standard.
4. Address any questions.
Your Inlet System
● Pulse vs. Static
● Turbine inlet airflow (800,000 – 890,000
CFM)
● Type of filters • Panel filters
• Canister type filters
• Cylindrical filters
• Cylindrical/cylindrical pairs
• Conical/cylindrical pairs
● Number of air filters/filter pairs
● Airflow per filter/filter pair (Turbine inlet
airflow divided by number of filters/filter
pairs)
Your Application
● Operating mode (base, intermediate, peak)
● Inlet operation mode (pulsing operation)
● Environment
• Temperature
• Moisture (coastal, rain, fog, mist, snow, sleet, cooling
tower drift, etc.)
• Hydrocarbons
• Dust concentration
• Local or seasonal airborne contaminants (pollen, cotton
seed blossom, agriculture processes, industrial
processes, etc.)
Filter Construction Materials
● Media • Glass fiber
• Cellulose
• Cellulose & Synthetic blend (blended media)
• Nano-fibers (Donaldson Spider-Web®)
• Membrane (ePTFE)
• Spun bond
• Melt blown
Data from Industry accepted
Testing Standards ● Resistance to airflow
• Filter type and configuration
• Test airflow rate (flow per filter/filter pair)
● Filtration efficiency (initial or average) • Initial efficiency (initial is not always minimum; static
charged filters)
• Minimum efficiency
• Average efficiency
• Initial efficiency @ most penetrating particle size
Industry accepted Testing
Standards ● ASHRAE52.2
● EN779
● EN1822
Industry accepted Testing
Standards
Blower
Filter Element
in test
Aerosol
Generator Sample
Probe
Sample
Probe Manometer Manometer
Dust
Feed HEPA
bank
HEPA
bank
Flow
Nozzle
Final Filter
Airflow
● Element Pre-Treatment (IPA dip/mist)
● Resistance to Airflow
● Filtration Efficiency/Particle Removal Efficiency
• Challenge aerosol (KCL or DEHS)
• Initial and/or Average Efficiency
• Dust loading
ASHRAE52.2
● Resistance to airflow • Measured at 25%, 50%, 75%, 100%, & 125% of test
airflow
● Aerosol (challenge aerosol) • Dry potassium chloride (KCI)
● Filtration Efficiency • Initial efficiency; average of “E1” category
● Efficiency Rating • MERV (minimum efficiency reporting value)
● Element Pre-Treatment • None
● Dust Loading • ASHRAE dust to 4.0”WG
ASHRAE52.2
EN779
● Resistance to airflow • Measured at 25%, 50%, 75%, 100%, & 125% of test
airflow
● Aerosol (challenge aerosol) • DEHS Neutralized (oil)
● Filtration Efficiency • Average efficiency (initial & loaded) up to 1.8”WG
resistance (6 points, initial plus 5)
● Efficiency Rating • “G”, “M”, “F”
● Element Pre-Treatment • Historically none; IPA with 2010 standard
● Dust Loading • ASHRAE dust to 1.8”WG
EN779
EN1822
● Resistance to airflow • 100% of test airflow
● Aerosol (challenge aerosol) • DEHS Neutralized (oil)
● Filtration Efficiency • Initial efficiency @ most penetrating particle size
(generally 0.1µ)
● Efficiency Rating • “E”, “H”, “U”
● Element Pre-Treatment • Historically none; IPA with 2009 standard
● Dust Loading • None
EN1822
Summary
Summary: Filtration Efficiency Measurements
Conclusion
● It is very important to understand your inlet,
application, & environment when choosing
GT inlet filters.
● 3rd party ASHRAE52.2, EN779, EN1822
reports can offer valuable information to
help compare filters.
● Understanding how factors such as static
charged filter media can effect test results is
very important.
● Input from fellow users and reflecting on
past experience is also good information to
help make good filter selection decisions.
● Leverage key industry resources.