The ELTECH Disk Anode™ was developed specifically for the rigors of
cathodically protecting dam and navigation lock gates. Since our disk
anodes are designed to operate in fresh, brackish, and seawater
environments, other suitable applications include: marine structures,
water tanks, and vessels. With an optional primary seal spacer gasket,
it can be used on the inside of pipes, tanks, or other curved surfaces.

The active element in ELTECH’s Disk Anode is a 6"diameter x 1/8"
thick titanium disk with a mixed metal oxide coating. This mixed metal
oxide is a crystalline, electricallyconductive coating that activates the
titanium and enables it to function as an anode. When applied on titanium,
the coating has an extremely low consumption rate, measured in terms
of milligrams per year. As a result of this low consumption rate, the
dimensions of the anode remain nearly constant throughout the design life.

FEATURES / BENEFITS

• 6" disk has 44% more active surface area than 5" disk.
• A 11/4" diameter FRP stud offers 27% greater load capacity than a
  comparable 1" diameter stud.
• Platinum plated rod threads prevent titanium oxidation assuring
  a low and constant contact resistance over the life of the anode.
• Increased FRP stud diameter and interlocking epoxy joint allow
  for a large torque capability on the jam nut threads — nominally
  1.6 times higher than a 1"diameter stud.
• Double lock nut configuration for securing and maintaining a
  watertight seal.
• Molded FRP components minimize glass fiber exposure —
  increasing component life and chemical resistance.
• Beveled edge of shield provides less resistance to water
  movement and minimizes debris accumulation.
• Weather-tight conduit box rotates 360° for optimum alignment
  with electrical conduit.
• No voltage restriction.

Current Outputs

Years	Freshwater	Brackish Water	Sea Water
20	1.6 amps	1.9 amps	3.9 amps
15	1.9	2.3	4.4
10	2.4	2.9	5.1

ELTECH Disk Anode™ — Calculation of Current Output vs. Lifetime

The mixed metal oxide coated disk is secured into a 12" diameter x 1/2"
thick dielectric shield made of a durable, chlorine resistant, molded
FRP-vinyl ester. This FRP shield has been designed to resist damage
from floating debris and ice, as well as serving to enhance the current
throwing capability of the disk. The shield also minimizes excessive
current damage to the coating on surrounding steel. The low profile
Disk anode fits flush with the surface, so total protrusion from the steel
bulkhead is a mere 1/2".

The coated titanium disk and shield assembly is attached to a 11/4"
diameter FRP stud via an interlocking epoxy joint. This unique joint
enhances torque capability and subsequent sealing. A 100% compressible
EPDM elastomeric o-ring molded into the shield assures a watertight seal
between the disk and steel bulkhead, while simultaneously allowing the
shield to fit flush against the bulkhead. Rod threads are platinum plated
to prevent oxidation of the titanium — providing a low and constant
contact resistance over the life of the anode. Nickel plated brass nuts
further ensure a reliable, low resistance contact. And to prevent crevice
corrosion of the titanium disk, a special, mixed metal oxide coating has
been applied on the edges and back.

Installation of the ELTECH Disk Anode™ is a simple and quick process.

• 1. Drill a 15/16" hole through the steel bulkhead. If a 1" hole is
  already in place, it will be necessary to ream the hole an
  additional 5/16". Remove all burrs.
• 2. Apply silicone caulking to the entire back of the FRP shield
  being careful not to cover the EPDM seal. This serves to displace
  water on the steel surface, thereby minimizing corrosion of the
  bulkhead behind the shield. Enough caulking should be applied
  so that a small bead forms around the entire shield perimeter
  after the disk jam nuts are tightened.
• 3. Once the disk is mounted, install and tighten the lock nuts
  against each other. It is suggested that the disk be attached
  at about 50% of its design torque - approximately 25 ft. lbs. On
  concave surfaces make sure the spacer gasket has been fitted
  before installing the disk in the hole.
• 4. Electrical connection to the titanium rod should be made with
  a zinc plated spade type wire terminal with a circular opening for
  a 1/4" rod. Make sure any exposed copper wire is appropriately
  protected with heat shrink, petrolatum tape, or other suitable
  water barrier.
• 5. For submersion service, it is advisable to fill the conduit box with
  a silicone or epoxy potting compound.

 

ELTECH Disk Anode™

Maximum Current for the ELTECH Disk Anode™ (life in years)

Click here for a print friendly PDF version.

LIDA® is a U.S. registered trademark of ELTECH Systems Corporation. LIDA® is a registered
trademark worldwide of Oronzio de Nora SA licensed exclusively to the De Nora Elettrodi Network.

LIDA TSA™ a trademark of ELTECH Systems Corporation and De Nora Elettrodi Network.
All information, recommendations and suggestions appearing herein concerning the
use of our products are based upon tests and data believed to be reliable. However, it is
the user’s responsibility to determine the suitability for his own use of the products
described herein. Since the actual use by others is beyond our control, no guarantee,
expressed or implied, is made by De Nora Elettrodi Network Companies as to the effects
of such use or the results to be obtained, nor does De Nora Elettrodi Network Companies
assume any liability arising out of the use by others of the products referred to herein. In
addition, the information herein is not to be construed as absolutely complete since additional information may be necessary or desirable when particular circumstances exist or because
of applicable laws or government regulations. Nothing herein contained is to be construed
as a recommendation to infringe any patent.