Improper cooling tower filtration can lead to serious illnesses.

Earlier this year, a woman living in the Washington Heights area of New York City filed a lawsuit against the Sugar Hill Project, the impressive $84 million subsidized housing building located in nearby Harlem. Completed in 2014, the mixed-use facility was designed to be an affordable living space for one of New York’s poorest communities, yet the development had one major issue that belied its high-minded, revitalization goals: it was getting people sick. 

Last summer, more than 50 people in the surrounding area were hospitalized resulting in 2 fatalities, all related to Legionnaire’s Disease. The outbreak was connected to the housing project’s cooling tower, which has since been shut down. If not properly filtered, cooling towers can instigate microbiological growth that can lead to health problems, such as those caused by Legionella.  

As an integral component of many cooling systems, cooling towers are typically used in industrial applications and in large commercial buildings to extract heat from a process or building system through evaporative cooling. Cooling tower systems operate most efficiently when their heat transfer surfaces are clean, but by design, require a large air-water interface to obtain this cooling and thus the system is subject to four major water treatment concerns: corrosion, scaling, fouling and microbiological activity. 

As waterborne deposits collect, they reduce heat transfer efficiency which can be very costly. Traditionally, the deposits are controlled by system blowdown, which increases wastewater discharge as well as concerns about water usage due to drought and environmental threat. As a result, cooling towers are being operated at higher contaminant concentrations, which only compound the problem. 

Addressing it involves full flow and side stream filtration. Filtration reduces blowdown, energy consumption and the kinds of fouling that leads to harmful microbial growth. Full flow filtration uses a filter installed after the cooling tower on the discharge side of the pump and is designed to continuously filter all of the recirculating system water. Side stream filtration continuously filters a percentage of the flow which significantly reduces system footprint, capital investment and operational cost — all very important considerations for affordable housing budgets. Additionally, these systems can be cleaned offline without shutting things down, eliminating the need for planned downtime. 

There is an array of filtration technologies available in the market, but few achieve adequate efficiencies. Screens require frequent backwash which increases water discharge. Hydroclones suspend solids through centrifugal force which can leave smaller particles behind. Sand filters can offload sand into the system. Bag filters have limited surface area, requiring large vessels to address flow requirements. All address some of the costs associated with inefficient cooling tower filtration, but in many cases introduce new ones.

Cartridge filters, on the other hand, address all costs: environmental, operating and health. They’re a disposable medium that exists in both non-pleated (lower cost, generally lower efficiencies) and pleated designs (high surface area) and offer high retention down to sub-micron levels, thus effectively addressing bio-burden issues. Some newer designs in the market such as large diameter offer further improvements in flow rates while reducing operating costs. 

In March, the New York City Council voted to reform the city’s cooling tower inspection protocol requiring the city’s Department of Buildings and Department of Health to present an annual report of cooling tower inspection results to the city council and post the results online. Cartridge filtration could play a critical role in those results, as well as the well-being of the surrounding Harlem and Washington Heights communities. The entire story is yet to be told, but it deserves a happy ending. Especially when one considers that the Sugar Hill Project has been designed with a Children’s Museum of Art and Storytelling at its base. 

STRATUM A – ABSOLUTE RATED

Stratum™ A Series Absolute Rated Melt Blown Filter Cartridges   

•Absolute retention ratings from 0.5 to 70 microns

•Multi-zone melt blown depth filter with a graded pore structure for maximum dirt holding capacity •Thermally bonded fibers for high void volume and long on-stream life •Lot traceable filters come with certificate of conformance •100% polypropylene FDA listed materials of construction •All components meet USP Class VI criteria and are safe for use in pharmaceutical applications •Molded center core for higher temperature and pressure capability NSF logoCertified to NSF/ANSI 61 for materials requirements only – Component * Typical Applications »Water »Pharmaceuticals »Food and beverages »Microelectronics »Cosmetics »Polymers »Coatings * NSF 61 applies to NN, P6 and PX styles only

•Multi-zone melt blown depth filter with a graded pore structure for maximum dirt holding capacity •Thermally bonded fibers for high void volume and long on-stream life •Lot traceable filters come with certificate of conformance •100% polypropylene FDA listed materials of construction •All components meet USP Class VI criteria and are safe for use in pharmaceutical applications •Molded center core for higher temperature and pressure capability NSF logoCertified to NSF/ANSI 61 for materials requirements only – Component * Typical Applications »Water »Pharmaceuticals »Food and beverages »Microelectronics »Cosmetics »Polymers »Coatings * NSF 61 applies to NN, P6 and PX styles only

•Multi-zone melt blown depth filter with a graded pore structure for maximum dirt holding capacity •Thermally bonded fibers for high void volume and long on-stream life •Lot traceable filters come with certificate of conformance •100% polypropylene FDA listed materials of construction •All components meet USP Class VI criteria and are safe for use in pharmaceutical applications •Molded center core for higher temperature and pressure capability NSF logoCertified to NSF/ANSI 61 for materials requirements only – Component * Typical Applications »Water »Pharmaceuticals »Food and beverages »Microelectronics »Cosmetics »Polymers »Coatings * NSF 61 applies to NN, P6 and PX styles only

FILTER ELEMENT TURBOGUARD

Graver Technologies, LLC introduces TurboGuard, its technically improved 6 inch (152 mm) high-flow filter for the utility market. Graver is the world’s largest supplier of condensate system filters and components and has been manufacturing precoat and non-precoat septa for condensate systems for more than 50 years. Graver is the consistent technology innovator with more than 40 patents and numerous technical advances for condensate and high purity water applications.

Graver’s family of TurboGuard High Flow Filters will provide superior CRUD removal upstream of deep bed demineralizers. TurboGuard High Flow Filters may also be used following ion exchange beds as a resin trap,
or as highly efficient pre-filters before membrane systems. Graver’s TurboGuard line of filters are manufactured in the USA at Graver Technologies manufacturing plants, under an ISO-9001 (2000) quality system.

Graver’s TurboGuard High Flow Filter integrates a number of improvements over currently available elements. With the most experience of any supplier in condensate applications, Graver can access more than 50 years of experience when improving fundamental filtration in condensate and high purity water applications.

AEGIS® TurboGuard® Pre-Filters

  • Flow is from the inside core to the outer pleats
  • TurboGuard Filters are wrapped in a one-piece extruded outer cage preventing media migration during inside out flow
  • TurboGuard’s one-piece extruded outer cage allows for easier maintenance and removal after use
  • One-piece molded end caps, including molded-in bail for secure handling during installation and removal
  • Quad Seal gasket system to provide maximum sealing surfaces
  • Highest dirt holding capacity – approximately 25 lbs (11.5 Kg) before removal is required
  • Low pressure drop – less than 0.2 bar in service at specified flow rate
  • Optimized media surface area allows full use of installed media area – not blocked off by media “squeezing

Typical Applications

  • Pre-filter for protection of Deep Bed demineralizers
  • Pre-filter for protection of RO membranes
  • Retrofit OEM high flow large geometry filter housings

Power Generation Systems — The Right Septa Choice

Filter Cartridges

QMA Polypropylene Filter Series

“Absolute” Rated High Performance Pleated Polypropylene Filter Cartridge

This filter is manufactured with a multilayer, graded densityasymmetric melt blown polypropylene media. This unique structure allows for low initial pressure drop and high dirtholding capacity, and long high efficient service.

Filter Features–Benefits

  • Micron ratings from 0.20 to 10 μm– Broad application rang
  • Meets USP 24 Class VI biological test for plastics
  • “Absolute” Efficiency – Rated at 99.98% (Beta 5000)
  • Graded pore density – Multilayer, graded density media – asymmetric pores for high dirt holding capacity
  • High surface area – High flow rate, and long on-line service – Minimize maintenance cost
  • Fixed Pore construction – Eliminates dirt unloading at maximum differential pressure
  • Polypropylene Construction – Inert to many process fluids
  • Various Gasket/O-ring materials – Compatible with many fluids
  • Heavy duty molded cage – High structural strength 

Applications

• Food & beverage • Aqueous solutions • Chemicals• Blowdown post filter • Pharmaceutical • Cosmetics • Magnetic tape coatings • RO Prefilters • Ink

FDA compliance
All polypropylene material used in manufacturing complies with the regulations of the FDA title 21 of the Code of Federal Regulations Sections 174.5, 177.1520, and 177.1630, as applicable for food and beverage contact.

TefTEC PTFE Membrane Filter Series

Absolute Rated PTFE Membrane Filter Cartridge

TefTEC cartridge filters are constructed with naturally hydrophobic PTFE membrane and polypropylene support layers and components. The HIMA retentive PTFE membrane offers superior hydrophobicity and water intrusion resistance compared to PVDF and polypropylene membranes, and the cartridge construction offers a cost-effective alternative to all fluorocarbon filters. TefTEC filters are ideal for gas/vent applications and the filtration of aggressive chemicals and solvents.

TefTEC Filter Features–Benefits

  • High surface area, single-layer construction provides superior flow rates and minimizes filtration system size
  • 100% Flushed with DI water and integrity tested
  • Meets applicable CFR criteria and USP Class VI Biological Test for Plastics
  • Filters are manufactured in an ISO Class 7 Cleanroom Environment
  • Filters are flushed, tested and packaged in a Class ISO 7 clean room
  • Manufactured using current Good Manufacturing Practices
  • Each filter element stamped with pore size, lot and serial number for identification and traceability

Applications

Aggressive chemicals • Tank Vents • Strong acids/bases • Compressed gases • Solvents • Photoresists • Pharmaceutical Intermediates • Hot DI water • Fermentation air

Crystal MBF Series Economical Melt Blown Depth Filter Cartridges

Melt Blown Filters

An economical, disposable, filter element that can be used in a wide range of applications. The Crystal MBF depth filter is constructed of 100% polypropylene media for chemical compatibility with a variety of process fluids. The unique Crystal Core prevents collapse even at elevated temperatures.

Crystal MBF Series Economical Melt Blown Depth Filter Cartridges

  • NSF 61 Certified
  • Nominal Micron Ratings – 1, 3, 5, 10, 20, 30, 50, 75
  • Multi-zone construction for a true graded pore structure
  • 100% pure polypropylene – FDA listed, USP Class VI compliant
  • Most popular end styles available
  • Continuous lengths up to 50″
  • Similar efficiencies to competitive products for ease of replacement
  • Bulk bag option for high volume users

 Typical Applications

  • Food & Beverages
  • Aqueous solutions
  • Wastewat
  • RO prefiltration
  • Chemicals

Flowrite Tank Breather Filter

Flowrite “TB” Series

Flowrite “TB” Series Tank breather filters are fabricated from 304-Stainless Steel. They are designed for a maximum operating pressure of 100 kPa at80ºC, depending on cartridges fitted. The “TB” Series housings feature Flowrite’s well proven centre post and nut design. Cartridges are located by their own end seals and a securing plate to which is attached a perforated stainless steel shield which allows free passage for the entering and exiting air during tank emptying and filling cycles.

The cartridges have double ”O” rings which give a perfect seal between cartridges and housing, thus eliminating any possibility of bypass. The practical and sturdy design of these housings allows quick and convenient cartridge change out of the 9¾” modular length filter cartridges.

Flowrite “TB” Series filter housings are available in one, two, three & four cartridge configurations to minimize pressure drop, and thus protect the tank from differential pressures while emptying or filling. The inlet port can be threaded or flanged to your specifications, and the unit is supplied in electro polished finish suitable for most semi and non-sanitary applications.

The housing should be used in conjunction with hydrophobic cartridges with a micron rating to your specification, which are also available from Flowrite

FEATURES & BENEFITS

Electro-polished, stainless steel construction
Suitable for most semi- & non-sanitary applications

Centre post & nut design
Quick, easy and convenient access to the filter cartridges

Integral locators & double “O” rings
Positive cartridge location and sealing eliminates bypass

Easy mounting
Flanged or threaded bottom inlet makes for direct, convenient, tank-top mounting

2-Piece construction
Easy to clean and versatile design

Flowrite “TB” Tank Breather filters are custom designed and made to order. Thus, when ordering or enquiring, please specify:

  • The tank volume
  • The liquid contained in the tank
  • The inflow and outflow rates
  • The operating temperature
  • The degree of filtration required
  • Suitable materials of construction

Once this information is available, a detailed, no obligation quotation for suitable housings and filter cartridges can be provided.

Graver Technologies melt blown filter cartridge

COAX™ Melt Blown filter cartridge

Two Stage Depth filter cartridge

The COAX Depth Filter cartridge is an integral two stage depth filter. The first stage of the filter cartridge is made of non-woven melt blown polypropylene to trap coarser articles.

The second stage inner core is composed of a bi-component polypropylene and polyethylene fibre to provide fine particle retention. This unique design provides a true graded density filter cartridge that offers a marked increase in useful life and dirt capacity.

In addition, the rigid nature means there is no flexing of the cartridge and greatly reducing media migration and particle unloading.

Filter Features–Benefits

  • Two stage graded density melt blown depth filter helps to Maximize dirt holding and useful life
  • Inert pure polyolefin construction, non-shedding media
  • Broad chemical compatibility
  • Low extractables
  • Meets USP Class VI standards – Acceptable for use in food, beverage and pharmaceutical applications
  • Extensive range of lengths and configurations
  • FDA listed materials of construction

Applications

Paint • Perfumes • Cutting Oils • CMP Slurries • Magnetic Slurries • Corn Syrup • Plating Solutions • Pre R.O. • Coatings

Filter Specifications

Media: Polypropylene

End caps: Polypropylene

Gaskets/O-Rings: Silicone, Viton, EPDM, Buna-N

Micron ratings: 1, 3, 5, 10, 20, 25, 30, 50, 75μm

Dimensions

Typical nominal lengths: 9.75″, 10’’, 20’’, 30’’, 40’’ (24.8, 25.1, 50.8, 76.2, 101.6 cm)

Other lengths available

Outside diameter: 2.5’’ (6.35 cm)

Inside diameter: 1.0’’ (2.54 cm)

Maximum differential pressure: 50 psid @ 70 °F (3.45 bar @ 21°C)25 psid @ 140 °F (1.72 bar @ 60°C)

Recommended change-out pressure for disposal: 35 psid (2.4 bar)

High Flow Series Filter Cartridges

Large Geometry Pleated Filters for High Flow

Graver High Flow Series filters feature a larger geometry to handle higher flows with fewer filter elements. The result is much faster, easier filter changeouts. In addition, the inside to outside flow allows for excellent dirt holding capacity, extending the time between filter changeouts.

Filter housings are also available and because of the filters high flow and dirt holding capacity, smaller systems are possible, reducing upfront capital costs.

High Flow Series Features – Benefits

  • 6” diameter, large geometry for high flows
  • Absolute retention ratings from 1 to 100 microns
  • Capable of flow rates up to 500 GPM in a single 60” element
  • FDA listed materials of construction
  • Inside-out flow retains contaminant even during change-out
  • Multi layer pleated construction with optimized surface area
  • Outer cage prevents media extrusion problem experienced with some competitive offerings
  • Unique Quad Seal gasket provides maximum seal integrity
  • Retrofits competitive high flow filter housings
  • Thermally bonded construction

Filter Specifications

Media:Polypropylene
Inner core:Polypropylene
Gaskets/O-Rings options:

EPDM, Silicone, Buna N, Viton

Micron ratings:

1, 3, 5, 10, 20, 40, 60, 100 μm

*Other micron rated media available upon request
Dimensions and Operating Parameters
Nominal lengths:

50.8, 101.6, 152.4 cm

Outside diameter:

6.0 in (15.2 cm)

Maximum operating temperature:80°C
Differential pressure:

180°[email protected] 20psid (82°C @1.4 bar)

160°[email protected] 30psid (71°C @2.1 bar)

77°F @ 50psid (25°C @ 3.4 bar)

Recommended changeout  pressure for disposal: 35 psid (2.4 bar)

Maximum flow rates:

60” element up to 500 GPM (1892 lpm)

40” element up to 350 GPM (1325 lpm)

20” element up to 175 GPM (662 lpm)

Filter Removal Efficiency

Beta Ratio EfficiencyBeta 1000 99.9%Beta 100 99%Beta 10 90%
1 micron10.60.2
3 micron321.5
5 micron543
10 microns108.56.5
20 microns221914
40 microns381815
60 microns603520
100 Micron1007545
Beta Ratio =
Upstream particle counts
Downstream particle counts

AEGIS® TurboGuard® Pre-Filters

Its technically improved 6 inch (152 mm) high-flow filter for the utility market. Graver is the world’s largest supplier of condensate system filters and components and has been manufacturing precoat and non-precoat septa for condensate systems for more than 50 years. Graver is the consistent technology innovator with more than 40 patents and numerous technical advances for condensate and high purity water applications.

Graver’s family of TurboGuard High Flow Filters will provide superior CRUD removal upstream of deep bed demineralizers.  TurboGuard High Flow Filters may also be used following ion exchange beds as a resin trap, or as highly efficient pre-filters before membrane systems.

Graver’s TurboGuard line of filters are manufactured in the USA at Graver Technologies manufacturing plants, under an ISO-9001 (2000) quality system.

Graver’s TurboGuard High Flow Filter integrates a number of improvements over currently available elements.  With the most experience of any supplier in condensate applications, Graver can access more than 50 years of experience when improving fundamental filtration in condensate and high purity water applications.

Filter Specifications

Media:
Pleated Proprietary
Inner core:
Multi-Layer Polypropylene
Gaskets/O-Rings options:
EPDM Quad Seal
Micron ratings:
1, 3, 5, 10, 20, 40, 60, 100 μm
*Other micron rated media available upon request
Dimensions and Operating Parameters
Nominal lengths:
20" 40" 60"
Outside diameter:
6” (152 mm)
Maximum operating temperature:
180°F (85°C)
Differential pressure:
180°[email protected] 20psid (82°C @1.4 bar)
160°[email protected] 30psid (71°C @2.1 bar)
77°F @ 50psid (25°C @ 3.4 bar)
Recommended changeout  pressure for disposal: 35 psid (2.4 bar)
Maximum flow rates:
60” element up to 500 GPM (1892 lpm)
40” element up to 350 GPM (1325 lpm)
20” element up to 175 GPM (662 lpm)

Filter Removal Efficiency

Beta Ratio EfficiencyBeta 1000 99.9%Beta 100 99%Beta 10 90%
1 micron
1
0.6
0.2
3 micron
3
2
1.5
5 micron
5
4
3
10 microns
10
8.5
6.5
20 microns
22
19
14
40 microns
38
18
15
60 microns
60
35
20
100 Micron
100
75
45
Beta Ratio =
Upstream particle counts
Downstream particle counts