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Model AT
Modular AST
Impressed Current Anode
from EDI
Cathodic protection for above-ground
storage tank bottoms
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 is an impressed current anode
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.
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 |
*The terms Pin and Socket refer to the brass
connector, not the CPVC shroud.
Notes
- When connector halves are fully mated, points (A) will
align.
- Current output not to exceed 10 mA/ft.
- Individual anodes may be interconnected to form strings of
any desired length. Power feeds must be no more than 1,000 feet apart.
- Current should be fed into anode strings from both ends.
Longer strings should have additional intermediate feeds.
- 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.
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Installation
Anodes can be interconnected to form either one continuous
string or several discrete strings. Lead wires are to be connected to both ends of anode
strings. The Tee End Lead Wire is used to provide intermediate feeds. Distance between
power feeds must not exceed 1,000 feet on single wire anodes.
To ensure optimum anode performance, anode should be
covered with calcined petroleum coke or fine sand. Make sure the material filters through
the poly mesh and completely encapsulates the anode.
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