Filtration is critical for turbine engines. If sub-micron particles, liquids and dissolved contaminants like air and water-borne salt aren’t captured by filters, they can enter the engine — resulting in compressor fouling and more severe problems like blocked cooling passages, blade erosion and hot gas corrosion. Ultimately, these issues can lead to lower power output, higher fuel consumption and more frequent repairs and replacement of high value parts.

E12 high-efficiency particulate air (HEPA) filters from Gore are engineered to keep your turbines up and running for the long haul. This durable watertight filtration technology is proven to:

• maintain clean engine performance
•  minimize downtime
•  lower maintenance costs over the filter’s lifetime

Gore’s proprietary thin, three-layer composite prescreens larger contaminants, captures smaller contaminants, and blocks water droplets with its naturally hydrophobic ePTFE (expanded polytetrafluoroethylene) membrane — allowing only pure air through.

• Advanced media developed specifically for ambient air filtration, proven with millions of operating hours globally.

• Three-layer, 100% synthetic composite with depth loading layer, hydrophobic ePTFE membrane and strong pleated backer support.

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By preventing ingestion of both dry and soluble contaminants, Gore’s HEPA technology practically eliminates compressor fouling over a long lifetime. Our uniquely engineered filters deliver the best ROI (return on investment) in challenging applications throughout many industries. You’ll notice the difference right away, but you’ll notice it even more in the long run.

Upgrading to GORE Turbine Filters with E12 hydrophobic HEPA technology has provided enormous value to rotating equipment users. These filters are designed to ensure a simple retrofit replacement of your current filters and in most cases, without filter house modifications. They deliver the greatest benefits to operators running intermediate and base load engines, who experience losses in compressor efficiency and power output due to fouling and who seek protection from corrosion due to salt ingestion. These systems are the high-usage, mission-critical engines where failure is not an option.

To learn more about GORE Turbine Filters, view our customers’ success stories or contact us to discuss your application with an experienced engineer.

Filter performance ultimately comes down to the inherent characteristics of the filter media. The most important factors to consider when selecting a filter are efficiency, hydrophobicity, initial differential pressure (dP) and long-term dP (lifetime). 

Only GORE Turbine Filters can offer industry-leading performance in all of these categories at once. This performance has been proven globally in the most challenging environments and delivers a positive economic ROI on gas turbines large and small.

Our cartridge-style filters are able to be pulse-cleaned. Pulse cleaning can be very useful depending on the local environment. In cold-weather regions where ice can form on the filter and in dry regions with sand storms, on-demand pulsing can be very effective. Programming of the pulse system should be optimized for the application.

Pulse cleaning our filters is not required or beneficial in environments where icing or heavy sand loading isn’t present. Broad industry experience has shown that pulsing is ineffective at dislodging sticky submicron particles like hydrocarbons.

Not all HEPA filters deliver the same performance in the same applications or environmental conditions.

There are many variations of HEPA filter media being used in today’s gas turbine industry.  Because these media types are composed of different fibers and layers, they work differently across various applications.

The filter media in GORE Turbine Filters is a three-layer composite that keeps fine particles, dirty water and salt out of the gas turbine.  Key differences are noted in the following:

• efficiency
• filter lifetime                                                                            
• material strength
• initial dP and long-term dP                               
• filter durability        
• maximum dP limit                                                 
• water tightness

In our turbine filters’ patented structure, the three synthetic layers work in concert to deliver outstanding performance.

• The first layer is a high-efficiency, non-woven material that prescreens the larger particles and captures contaminants throughout the depth of the structure.
• The second layer is ePTFE, which captures very fine sub-micron particles that pass through the pre-filter layer. Additionally, the ePTFE membrane has a tight pore structure, which makes it naturally hydrophobic and blocks liquid water and dissolved salts and contaminants from passing through to the turbine, dramatically reducing fouling.
• The third and final layer is a robust synthetic backing textile that provides rigidity and very high media burst resistance.

The resulting laminate delivers high efficiency and water protection with low dP and proven filter lifetime.

Why E12 vs. E11 or E10 Filter Classifications

E12 HEPA filters block >99.5%, allowing <0.5%, effectively eliminating compressor fouling. The combination of hydrophobicity and high-efficiency filtration found in GORE? Turbine Filters is key to protecting the turbine.

E10 HEPA filters only block 85% of the particles known to cause compressor fouling, allowing 15% to enter the turbine — significantly reducing compressor efficiency. Additionally, most E10 filters don’t eliminate water. Water carries salt (corrosion) and dirt (fouling) into the clean side of the turbine or compressor.

Our filters benefit turbine engines in numerous ways:

Reduce Turbine Wear

• Prevent blocking of cooling ports and overheating of blades
• Prevent rotational imbalance from compressor fouling
• Avoid cyclical thermal stress due to turbine stops and restarts for cleaning

Optimize Power Output

• Eliminate power loss from compressor fouling
• Eliminate fouling-induced heat rate increases
• Prevent captured contaminants from rinsing through filters during periods of heavy rain or fog

Increase Turbine Availability & Reliability

• Eliminate need for off-line compressor washing
• Avoid risk of startup and shutdown failures
•  Operate continuously at clean compressor efficiency

Reduce Salt Corrosion

• Prevent liquid water ingress through filters
• Stop penetration of airborne and waterborne salts
• Reduce corrosion in compressor and hot section

Turbine filter lifetime is subject to many variables. The first step to optimize E12 HEPA filter lifetime is to define your application.

• What type of inlet filters are you currently using and how long do they last?
• What is the overall airflow and flow per filter element?
• How many hours does the system run per year? Is the unit considered peak, intermediate or base-loaded?
• Are there local environmental challenges, such as heavy pollution, fog, insects or agricultural burning?

GORE Turbine Filters have a proven lifetime of two to four years in very challenging coastal and industrial environments.

Learn more about Filter Lifetime

Understanding HEPA Filter End of Life

It is important to understand what to expect when your E12 hydrophobic HEPA filters from Gore near the end of their service life.

HEPA filters are highly efficient and capture virtually all particles in an airstream over their lifetime. When the filters begin to approach end of life, ?P trend monitoring will begin to show sensitivity to wet and humid conditions. However, the filters’ patented multi-layer construction delays this effect, enabling long lifetime even in challenging conditions.

Our customers have seen the benefits of protecting their turbine engines with GORE? Turbine Filters. See the results based on filter type, environment and more factors.

Note: Laboratory test data is on file at Gore.