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Lida MMO Solid Rod Anodes by De Nora Tech

Farwest is a licensed, stocking distributor and fabricator for the Lida MMO line of cathodic protection anodes.
High Output Mixed Metal Oxide Rod Anodes for C.P. Applications
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LIDA Rod Anodes are comprised of a titanium substrate with a mixed metal oxide (MMO) coating. The mixed metal oxide is a crystalline, electrically conductive coating that activates the titanium and enables it to function as an anode.

The rod anodes are provided in a standard 4 foot length, but the anodes may be custom cut to virtually any length. The standard anode diameters include 1/8", 1/4", 1/2", and 3/4". Anode coatings are available in "Standard" or "XL" depending on your application or anode current and/or life requirements.

At Farwest, we can custom fabricate an anode assembly to include the LIDA anode rod of your choice.  This includes adding a cable lead with connection encapsulation, customizing probe-type anodes and more.  Contact a Farwest representative to assist you with your fabrication questions.

Applications

  • Process or Production Vessels
  • Water Condenser Boxes
  • Heat Exchangers
  • Water Intake Structures
  • Groundbed (in coke breeze)

Features

  • High Current Output
  • Low Coating Wear Rate
  • Five Year Product Warranty
  • Also available as Rod Anode Assemblies

Benefits

  • Lower Cost per Ampere-Year
  • Constant Electrical Resistance
  • No Hassles

Standard Anode Rod Sizes

LIDA Rod Anodes are available in these standard sizes:

  • 1/8" x 4'
  • 1/4" x 4'
  • 1/2" x 4'
  • 3/4" x 4'

Typical Rated Current Output

Application Anode Dia.
(inches) 		Design Life
(years) 		Rated Current Output
(Amps per linear inch)
  Freshwater 0.125
0.25
0.50
0.75		 10
10
10
10		 20
20
20
20		 0.067
0.134
0.268
0.400		 0.044
0.088
0.167
0.270
  Seawater 0.125
0.25
0.50
0.75		 10
10
10
10		 20
20
20
20		 0.140
0.280
0.570
0.840		 0.123
0.245
0.490
0.740
  Coke 0.125
0.25
0.50
0.75		 10
10
10
10		 20
20
20
20		 0.052
0.103
0.210
0.310		 0.035
0.069
0.140
0.210
  Sand 0.125
0.25
0.50
0.75		 15
15
15
15		 30
30
30
30		 0.0167
0.0033
0.0067
0.0100		 0.00094
0.0019
0.00375
0.00556

Selection of the anode coating is based on operating environment.

Standard Rod Anode Assemblies

For applications in vessel internals, De Nora Rod Anodes are available with mounting
assemblies, consisting of an FRP dielectric shield and 1" or 1.25" NPT nipple

 
Freshwater or
Brackish Water
Sea Water
Environments
  Part Number
FA-ROD 0.5FW
FA-ROD 0.75FW
FA-ROD 0.5SW
FA-ROD 0.75SW
  Max. Current Output (amps)
1.6
2.4
9.7
14.6
  Rod Diameter (in)
0.5
0.75
0.5
0.75
  Total Length (in)
24
24
24
24
  Active length max-user specified (in)
16
16
16
16
  FRP Length (in)
6
6
6
6
  NPT Pipe Nipple 1.0" 1.25" 1.0" 1.25"
  Maximum water velocity (ft/sec)
2
5
2
5

Drag & Vibration Data of Rod Anode Assembly

   

Anode Life Data

Due to the extremely low consumption rates and dimensional stability of mixed metal oxide anodes, the electrical resistance of De Nora Rod Anodes remains essentially constant with time. The high current density capacity of De Nora mixed metal oxide anodes has the added advantage of allowing high current overloads for initial polarization without causing harm to the anode.
  

  
 

Lida MMO anode rods are available in a number of impressed current assembly confiruations that include:

  • Probe anode assemblies for insertion into interiors of oil or other production vessels
  • For soil (with coke breeze) or water applications with a single lead wire
  • For soil applications where the rod is installed in a canister with coke breeze backfill

Probe Anode Assemblies

Probe anodes are typically for use in the interiors of oil or other production vessels.  Configurations vary depending on the performance requirements, fitting sizes, etc.  Contact a Farwest representative for assistance in an anode design.

De Nora also provide a custom rod assembly consisting of consisting of an FRP dielectric shield and 1" or 1.25" NPT nipple.  Details of this anode assembly are shown below.  Availability depends on anode quantity as these are custom built assemblies.

 
Freshwater or
Brackish Water
Sea Water
Environments
  Lida Part Number
FA-ROD 0.5FW
FA-ROD 0.75FW
FA-ROD 0.5SW
FA-ROD 0.75SW
  Max. Current Output (amps)
1.6
2.4
9.7
14.6
  Rod Diameter (in)
0.5
0.75
0.5
0.75
  Total Length (in)
24
24
24
24
  Active length max-user specified (in)
16
16
16
16
  FRP Length (in)
6
6
6
6
  NPT Pipe Nipple 1.0" 1.25" 1.0" 1.25"
  Maximum water velocity (ft/sec)
2
5
2
5

Conventional Style Assemblies

Lida MMO anode rods can be made with a conventional cable lead for use in soil or water applications. Typically, the cable-to-anode connection is sealed in a water-tight assembly to protect the connection from failure due to physical stress or water intrusion.  However, these assemblies can be customized as required by specification or application.
 
Contact a Farwest representative for design or application assistance.

 

Anode performance and life will vary depending on a number of factors including rod diameter, length, coating type and the environment or electrolyte the anodes will be utillized.  The following graphs will help you to understand the theoretical current output and life expectancy in various electrolytes.

Example:  In graph number 1, a 1/4" diameter, 48" long, XL coated anode in free-flowing seawater is designed to provide 10 amps DC for approximately 22 years.  Compare that with graph 5 where the same anode in coke breeze backfill will only provide a little over 3 amps DC for the same time period.

As you can see, anode performance will vary greatly depending on the application so it is important to understand this relationship when designing any anode.