Features

• Design flexibility - modular design permits multitude of anode configurations.
• Light weight - very easy to ship and handle.
• Simple to install - no field splices or weldments.

Design Compatibility

The Model AT impressed current anode is specially designed for cathodic protection of above-ground storage tanks. It consists of a copper cored titanium flat wire coated with platinum or mixed metal oxide and attached to a #14 AWG HMW/PE insulated bus wire. The wire pair is surrounded by a flexible plastic mesh. Individual anodes are 50 ft. long and are easily connected in the field to form a hermetically sealed joint. This allows the design engineer to choose a layout which is best suited to the tank and its local environment.

Each component used in the Model AT has been field-proven in similar demanding applications; and therefore, it can be reliably operated up to 10 mA/ft for more than 50 years. Spiral layouts offer the most redundancy as well as uniform current output over the entire tank bottom. Alternatively, individual concentric rings permit varying current outputs where local conditions necessitate it. For any design configuration, the installation is quick and easy due to its light weight and flexibility.

Perhaps the most significant feature of the Model AT is its unique connector system. Each anode is supplied with a pin connector on one end and a socket connector on the opposite end which can be mated either to another anode section to form a string or to a power feed cable. Cables with the specially developed "tee" connector allow intermediate current feeds on long strings. These connectors are designed for underwater cable connections and are being used successfully on other EDI products in turbulent aqueous solutions. All connectors are factory made and sealed which means that there are no splices or weldments required in the field.

NACE Paper

Installation of an Instrumented Cathodic Protection System on a Large Diameter AST
Paper #03200 presented at Corrosion 2003. ©NACE International 2009. Reproduced with permission from NACE International, Houston, TX. All rights reserved.

Connector Specifications

Pin & socket material*

Brass Alloy 360

Connector body

Neoprene

Current rating

15 Amps

Insulation rating

750 Volts

Minimum insulation thickness

0.040"

Contact resistance

< 0.01 ohm

Insulation resistance

> 200 megohm after wet mating

Pressure rating

20 kpsi

Rated number of wet matings

500

Connector shroud material

CPVC

1. When connector halves are fully mated, points (A) will align.
2. Current output not to exceed 10 mA/ft.
3. Individual anodes may be interconnected to form strings of any desired length. Power feeds must be no more than 1,000 feet apart.
4. Current should be fed into anode strings from both ends. Longer strings should have additional intermediate feeds.
5. Assemble individual anodes into strings by pressing pin end fully into socket end. The joint can be made permanent by using any solvent cement suitable for use with CPVC.