NUCLEAR GRADE RESINS

Gravex® is a complete product line of high-purity, quality-certified cation, anion and mixed bed ion exchange resins.

These custom-blended bead resins are the cleanest bead available, washed and classified, every batch tested and samples filed for future reference.

They are processed to meet nuclear specifications. We offer the most conclusive results available for nuclide removal products. Graver Technologies also supplies bead resin manufactured by Dow, Rohm & Haas and Lanxess (Bayer).

These Gravex Nuclear Grade Ion exchange resins are very high capacity polystyrene, gel type resins. They have been regenerated and processed to provide the highest possible performance in nuclear applications. The Gravex cation is specially processed to minimize leachable sulfonic acids.

Its high capacity and oxidative stability help achieve optimal performance. Gravex mixed beds are the most uniformly blended products available and have the same consistent cation to anion ratio in every package. Our unique blending process creates the less separable GR-3-16 NG stoichiometric mixed bed. A 7Li+ form cation is available as GR-7-16 NG and in the GR-4-7 NG mixed bed.

Proven Technology for the Most Challenging Separations

Combined Cycle Power Generation

Condensate polishing (CP) is an essential component of combined cycle plant design and operation because high purity condensate maximizes uptime. CP safeguards high-value plant assets by reducing startup/downtime, stabilizing cycle chemistry, minimizing corrosion transport and optimizing operations.

CP is particularly important for air-cooled condenser (ACC) systems, once through steam generators and plants with frequent startups. Utilities can’t afford to ignore this vital and economical system that consumes a tiny portion – typically 1% – of plant construction budgets.Electric generating station condensate must be maintained at a very high purity level to protect boilers, steam generators, reactors, and turbines from corrosion.

To remove contaminants from the condensate, deep bed ion exchange condensate polishers are used and sometimes preceded by a Powdex® filter demineralizer or a fine particulate filtration system. A Powdex system can also stand alone as the primary polisher. Graver Technologies is the most experienced and knowledgeable Ion Exchange product and Filter Septum manufacturer and offers the most complete range of products to meet today’s challenges.

Whether the need is for high purity condensate polishing bead or powdered ion exchange resins or filter elements specially designed for condensate polishing, Graver Technologies has the answer for your application.

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

Powdex® Powdered Resins

Powdex® PAO Series

  • Powdered strongly basic hydroxide form anion exchange resin
  • Highest possible conversion to hydroxide form with very high purity
  • Mixed at point of use with Powdex PCH or PCN to form larger agglomerates
  • Then precoated on Aegis® wound and DualGuard® precoat septa and others in precoat filtration systems known as Powdex filter demineralizers
  • Rapid kinetic performance with excellent hydraulic properties providing simultaneous ion exchange and solids filtration
  • Excellent precoat uniformity essential for proper performance

Typical Applications

  • Nuclear BWR & PWR condensate polishing
  • Nuclear BWR reactor water cleanup
  • Fossil condensate polishing

Click here to download Powdex® Selection Guide.

DEEP BED CONDENSATE POLISHERS

Graver Water  has optimized deep bed condensate polishing technologies through the use of proprietary flow distribution enhancements and enhanced collection, to maximize resin utilization. For on-site regenerated systems Graver’s trademarked and proprietary two-vessel SepraEight® regeneration design results in a smaller footprint for regeneration equipment without compromising separation efficiency or optimum regeneration.

Deep bed/mixed bed condensate polishers are the preferred technology for plants using high TDS cooling waters such as seawater, as well as where there is a requirement to operate long term with small condenser leaks or an inability to control excessive air in-leakage.

Both Deep Bed and Precoat type Polishers remove iron, copper, silica and salts, and suspended solids. However, Deep Bed Polishers provide the best method for the removal of high ionic loads due to their large ion exchange capacity. Graver’s Deep Bed Condensate Polishers have been designed to handle service pressures of up to 800psi with inlet distributors and underdrain that operate more efficiently than competitive designs.

RESIN OPTIMIZATION

Ion exchange resin selection and ratios can be optimized for the particular application and condensate chemistry. For instance when “All Volatile Treatment” (AVT) is used the result is an elevated operating pH (amine level) the resin ratio of choice would be a high cation exchange to anion exchange resin ratio (2:1) when in a neutral pH environment, as would be seen in a boiling water reactor (BWR) a stoichiometric blend of the ion exchange media would be employed. Upon exhaustion, either due to ionic breakthrough or pressure drop, the units are regenerated though a series of backwash, chemical regenerants (either in situ, external or off site) and then returned to service.

When Deep Bed Condensate Polishers are paired with a quality ion exchange resin such as Gravex® Bead Resin, efficient polishing of condensate is easily obtained. When the exchange capacity of the resin is exhausted it can either be sent off-site for regeneration or disposal, or it can be regenerated on-site using Graver’s SepraEight technology.

ADVANTAGES

  • High ionic loading removal
  • Up to 800psi service pressure
  • Up to 50 gpm/sq. ft. flowrate
  • Superior resin regeneration

NANODEX

NANODEX FILTER PAPERS TRACK SYSTEM AND PLANT PERFORMANCE by Monitoring Radionuclide and Corrosion Products

Graver’s patented Nanodex Ion Exchange Filter Papers enable diverse quantitative analyses in the power industry, especially nuclear, to monitor corrosion products, measure activity levels and satisfy fuel warranty requirements.

Nanodex AX 100 anion exchange filter disks contain strongly basic, quaternary ammonium functional sites in the chloride form, which can be converted to the desired ionic form (i.e. hydroxide) as required.

Nanodex CX 200 cation exchange filter disks contain strongly acidic, sulfonic acid functional sites in the hydrogen form. Contact your Graver representative for more information about these innovative filter papers.

FEATURES

  • High performance, specialty hydrophilic paper for a variety of analytical requirements
  • Uniform resin distribution throughout each disk
  • Standard 47mm diameter
  • Highly functionalised, highest ion exchange capacity analytical filter
    disks available
    Filter disks are easily digested by standard analytical methods

BENEFITS

  • Excellent hydraulic characteristics
  • Consistent ion exchange capacity and utilization
  • Fit standard bench-top and inline filter holders and housings
  • Single disk used per test
  • Simple to quantify ions removed – X-ray fluorescence or Atomic Absorption

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 Efficiency Beta 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
Graver Technologies logo

Graver Technologies Filtration specialists

Germ Africa distribute the renowned Graver Technologies range of filtration media, Ion Exchange Resins and adsorbents.

In the 1880’s Graver was part of Union Tank Carbide, which Supplied water treatment for pressure steam boilers.

Graver then became central to the supply of water treatment equipment to power generation and chemical processing industries.

The Graver Chemical Company which had become a Supplier of Ion Exchange resins, adsorbents and condensate filters was then established.

And finally Graver Technologies came along with a name change in 1998 with expansion into filtration and separation technologies.

The headquarters are now located in Delaware, USA, and Graver Technologies has become one of the world’s largest manufacturers of filtration products.

Graver Technologies quality systems are ISO 9001:2000 compliant, and their membrane filters are flushed, tested and packaged in a Class ISO 7 clean room, they have a suitable filter cartridge for almost any liquid or compressed gas filtration application.

The Graver Range includes a wide variety of filter cartridges in the following formats.

Graver Technologies is one of the fastest growing filtration companies in the world and continues to server its clients with quality products at affordable prices.