ASC Intake Filtration System
State of the art in turbine intake filtration
Advanced self clean technology
for rotary machinery
Ultimate filtration for harsh environments
The AAF ASC Intake filtration system is a unique concept in air
filtration for gas turbine intakes and other smooth intake flow
machinery. It combines inertial separation technology with
self-cleaning air filtration in one compact package.
The development
In recognising the high failure rate of ordinary self clean filters located in difficult
environments, AAF have developed the ASC hybrid filter system. Operators
demanding continuous engine operation in the arduous environments prevailing
in desert and gas turbine process applications have recognised the AAF ASC
technology as the primary choice for combustion and ventilation application.
Why do regular pulse filters fail
Ordinary cylindrical and conical systems increase rapidly in differential pressure
as they capture airborne dust.
This unwelcome process is accelerated in environments where high dust
concentration is incident with high humidity levels and free moisture.
Cylindrical and Conical Systems
The cylindrical filter element contends with a continuously higher level of entrained
dust and consequently a higher system pressure.
ASC Filters
The filter elements trap dust during operation clogging the filter element. This
restricts airflow and initiates a reverse pulse cleaning cycle. This pulses each
individual filter element, however in the absence of an exhaust mechanism any
dust removed is re-entrained by the positive suction of the adjacent filter.
When entrained dust is exposed to high relative humidity and/or free moisture
individual particles swell reducing porosity further, causing a spike in system
pressure.
During sandstorm conditions
When unable to exhaust captured dust from the system, ordinary cylindrical
systems quickly reach terminal pressure enforcing turbine power de-loading
or a forced shutdown.
Upstream Vanes
4
1
Filtered
combustion
3
Ambient air air
2
1 Filter element
2 High efficiency media
3 Secondary air chamber
4 Pulse system
5 Dust evacuation fan 5
Why AAF ASC with secondary air technology works
Dust laden air entering the ASC Intake System is captured by passing through the filter elements before
heading to the turbine compressor.
The ASC does not rely on the filter to trap all of the incoming dust and dirt. In close proximity to each filter is
the secondary air removal chamber, negatively pressurised by its exhaust fan. Heavy dust and dirt particles
which make up over 90% of the incoming challenge are inertially accelerated past the filter element and
removed from the system. The ASC media remains cleaner for longer only entraining the smaller airborne
particles.
ASC advanced self cleaning
When called to action blowpipes located downstream of each filter element direct a jet of clean pressurised
air simultaneously through parallel vertical columns of filters. This momentary pressurisation and reverse of
air flow dislodges the accumulated particles from the filter elements, automatically reconditioning the filter for
continued, uninterrupted service. The dislodged dust is immediately vacuumed into the secondary cleaning
circuit avoiding direct re-entrainment of the dust or its passing into any adjacent filter element.
Free moisture removal
The layout and orientation of the ASC system was conceived for the application of vane technology for free
moisture removal within the intake face.
In environments where fog is prevalent the effective performance of the vanes offers significant performance
advantages to both reducing pressure loss and extending filter life.
Installations in Middle East, coastal facilities fitted with moisture eliminators have achieved up to four years
operational life from a single set of filter elements without any experience of machine trip due to high
differential pressure.
The ASC Advantage
AAF's ASC intake filter system is designed to
offer maximum protection in harsh environments
where extreme weather conditions such as
sandstorms, high rainfall, fog and high salt
concentration are present.
Longest Filter Life
The ASC Secondary Air technology has been proven to allow operators
to extend filter life, often trebling prior experience. Reducing the
production interruption for filter change improves engine availability.
Pressure loss is far more stable and less effected by extremes of relative
humidity and fog.
Operators in coastal located desert climates repeatedly achieve 3 years
Location: UAE uninterrupted production.
Compact package
The ASC system is considerably smaller than an ordinary self-cleaning
system. This means that it can be easily adapted to existing supporting
structures for retrofit and also reduces shipping and installation costs.
Low average pressure loss
Lower initial and average pressure differential across the system
improves engine fuel efficiency.
Location: Kingdom of Saudi Arabia
Operating Benefits:
• Low pressure loss boosts available power
• Reduced engine fuel consumption and maintenance costs
• Increased turbine availability
• Similar in size to equivalent older static filter systems which makes
retrofit easier. In many cases existing structures can be utilised
without major modification
• Less pulsing reduces energy costs
Location: Kingdom of Saudi Arabia
Location: Oman
Easy Conversion and Retrofit
Gas Turbines operate in varying environmental locations and so it is necessary sometimes to modify an air inlet
system to fine tune the machine performance or to overcome drastic deficiencies.
Equally at AAF we understand many operators have older equipment which has either come to the end of its useful
life and is unsafe to operate or where incremental equipment repair fails to reverse the performance degradation.
In response to this AAF's technical centre has engineered easy-to-retrofit conversion packages which can be
applied to Gas Turbine, Compressor and Diesel Engine equipment.
Our applied division aim to utilise your existing plant through exploiting our compact ASC solution.
The modular ASC technology is the perfect refit system in instances where present technology is failing to provide
reliable and effective protection. It can be applied on combustion duty or enclosure ventilation where the unique
design provides a small compact unit.
The advantage of its small size means it easily adapts to existing support structures and most critically can be
converted in a record installation time reducing planned outage intrusion.
Choose the right media for your application
AAF offers a variety of filters that are optimised to different efficiency requirements.
PanelPak Media
The ASC high efficiency media is available in a range of types and efficiencies specially treated to provide exceptional resistance to
high humidity. Each filter element is supplied with a moulded gasket fitted to the air leaving face, which guarantees a positive airtight
seal every time the filter is changed.
ASC Filter
High efficiency filter for air intake systems
Key Data PanelPak F8 PanelPak F9 PanelPak E12
F8 F9 E12
Filter Class to EN779:2002
F8 F9 E12
Filter Class to
ASHRAE 52.2 - 2007 MERV 14 MERV 16 -
• For machinery needing up to
F9 efficiency
• Higher capacity
• Higher capacity For EPA efficiency requirements
• Longer life
Features & benefits • Longer life please contact your local
• Reinforced media for transport
• Reinforced media for transport supplier for more information
protection
protection
Nominal air flow rate 2300 m3/h 1350 CFM 2300 m3/h 1350 CFM -
Initial pressure drop at 282 Pa 260 Pa
-
nominal air flow rate 1.13" WG 1.04" WG
Recommended final 1000 Pa 1000 Pa
-
pressure drop 4" WG 4" WG
Bursting Strength 25" 25" 25"
Average arrestance >99.9% >99.99% -
Average efficiency 90% 95.01% -
Nominal: 24" x 9.75" x 48" Nominal: 24" x 9.75" x 48" Nominal: 24" x 9.75" x 48"
Dimensions
Exact: 610 x 300 x 1230mm Exact: 610 x 300 x 1230mm Exact: 610 x 300 x 1230mm
ASC Intake Filter System Accessories
AAF offers a range of add-on technology to compliment the high performance ASC.
As a provider to some of the world's largest turbine manufacturers and operators, AAF understands the requirement for
greater power and enhanced efficiency.
The AAF (H)EPA filter products have achieved a remarkable reputation for providing clean air to Gas Turbines operating
in the hostile environment prevailing offshore and coastline locations.
Please contact your local AAF representative for more information on (H)EPA products and applications.
Moisture Removal (H)EPA Filters
Free-moisture allowed to interact with
coalesces on media fibers, mixing with An additional filtration stage for removal of ultra-fine (sub-micron) particulate. Proven technology which
captured dirt particles which absorb the negates the requirements for on or offline water washing while recovering otherwise reduced engine
moisture, swell and increase pressure drop. output and fuel economy.
Water accelerates dirt- and salt-laden water
leaching which carries over to foul the engine
compressor.
Key Data AmerVane VI HydroVee XL HydroVee HXL
Filter Class to
EN779:2012 /N1822:2009 Fine Mist E10 / E12 E10 / E12
Filter Class to
ASHRAE 52.2 - 2007 96% @ 25 micron MERV 16 MERV 16
The AmerVane VI high velocity weather Developed from the success of the The big brother to the HydroVee XL, the
louver, designed and patented by AAF, classleading HydroCel offshore unit, HXL’s 450mm-deep casing allows for
is a heavy-duty, high efficiency, mist HydroVee filters deliver high-efficiency 28.8 m2 for longer filter life while
eliminator. Ultra-low operating pressure performance with minimal reducing pressure loss. Featuring a huge
Features & benefits drop makes the AmerVane VI a truly pressure loss. Employ AAF HydroVee when dust holding capacity, the HXL provides
cost-effective, first-stage separator to experiencing salt and hydrocarbon peace-of-mind performance in the
any intake filter system. compressor fouling in high-moisture harshest environments.
coastal or tropical environments.
Nominal air flow rate 4.5 m/s (900 FPM) 4250 m3/h 2500 CFM 4250 m3/h 2500 CFM
Initial pressure drop at 27 Pa @ 2.5m/s 285 Pa 442 Pa 187 Pa 329 Pa
nominal air flow rate 0.11" WG @ 490 FPM 1.14" WG 1.77" WG 0.75" WG 1.57" WG
Recommended final 635 Pa 635 Pa
-
pressure drop 2.55" WG 2.55" WG
Bursting Strength > 6225 Pa, > 25" WG > 6225 Pa, > 25" WG > 6225 Pa, > 25" WG
Average arrestance - 100% 100%
Initial efficiency @MPPS - 89.6%, 99.9% 92.7%, 99.5%
185mm deep vane.
Nominal: 24" x 24" x 12" Nominal: 24" x 24" x 17"
Dimensions Length and quantity of vanes
Exact: 592 x 592 x 292mm Exact: 592 x 592 x 440mm
to suit filter housing.
Quality, expertise and innovation
Sales Offices:
EUROPE & NORTH AFRICA MIDDLE EAST & ASIA
AAF Ltd AAF International FZE,
Bassington Lane, Cramlington, FZS1BC01-FZS1BC04
Northumberland NE23 8AF, UK Free Zone South Dubai,
Tel: +44 1670 713 477 PO Box 263120,
Fax: +44 1670 714 370 Jebel Ali, Dubai, UAE.
Tel: +971 4 889 4886
AAF-S.A. Fax: +971 4 889 4887
Urartea, 11
Polig. Ali Gobeo AAF (Wuhan) Co. Ltd
01010 Vitoria, Spain 268 CheCheng Road
Tel: +34 945 214851 Wuhan Economic & Technological
Fax: +34 945 248086 Development Zone
Wuhan, Hubei Province P.R.
AAF-SA China 430056
Rue William Dian, Tel: +86 27 84236698
B. P. 3 Fax: +86 27 84236646
27620 Gasny
France NORTH & SOUTH AMERICA
Tel: +33 2 32 53 60 68 AAF International Building
Fax: +33 2 325 21917 9920 Corporate Campus Drive, Suite 2200
Louisville, KY 40223-5000
AAF S.r.l. USA
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22076 Mozzate CO Toll Free: 888 AF 3596
Italy Fax: +1 502 637 0147
Tel: +39 03 31838611
Fax: +39 03 31838644 AAF, S. de R.L. de C.V.
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San Andrés Atenco
Tlalnepantla, Edo. de Mex, Mexico
Tel: +52 55-5565-5200
Fax: +52 55-5390-5814
+44 (0) 1670 713477
Gas Turbine Aftermarket Division
aafgbtsolutions.com
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