Plattline Zinc Ribbon Anodes for Above ground storage tanks

PLATTLINE
ZINC RIBBON ANODES FOR

™

ABOVE GROUND STORAGE TANKS

PLATTLINE™ ZINC RIBBON ANODES
Cathodic Protection (CP) is the application of direct current to reverse the natural tendency for metals to return to their natural condition as metal oxides (rust). CP prevents the corrosion process from occurring. Corrosion occurs in the presence of moisture. In Above Ground Storage Tanks, itis important, both economically and environmentally, to protect tank bottoms from corrosion. The area under the tank bottom can become moist and can remain moist from ground moisture, under-tank condensation or seam leakage. Present regulations make protection of the tank bottom desirable. Whether the tank bottom is the initial bottom of a new tank, a replacement bottom, or a double bottom,proper corrosion protection is important. In the past, replacement bottoms were installed over the old bottom and welded to the old bottom at the tank wall. This procedure closes the corrosion circuit, making the new steel anodic to the old tank bottom, and in the process accelerating the corrosion process of the new metal. Experience has shown that a properly designed and installed zinc ribbon anodesystem in the interstitial space between new and old tank bottoms is very effective at providing cathodic protection. This system has been recognized throughout the industry as the most cost effective and efficient method of corrosion control today. Plattline™ Zinc Ribbon Anodes provide a simple and cost effective method of corrosion control for Above Ground Storage Tank bottoms. The zinc ribbon isself regulating which means that it will protect the steel tank bottom when the electrolyte (the sand) is conductive (moist) only on demand. When the demand decreases, the zinc ribbon output will decrease as well. No external power source is required. Plattline™ is a continuous zinc ribbon and simple to install. No special tools are required and there is no need for constant monitoring ormaintenance once the system is installed.

Figure 1 – Plattline™ Zinc Ribbon Anodes are used to protect above ground storage tank bottoms.

Features
• • • • • • Easy to install. Even distribution of current density. Self-regulating current output. Continuous lengths enable a variety of designs. Normal design life of 20 years or more. Anode configuration is ideal for use in small or limited spaces.Installation
Plattline ™ Zinc Ribbon Anode can be installed in several ways. It can be cut into lengths and connected by a lead wire along the tank bottom or it can be laid out in a spiral or serpentine fashion in a continuous length along the tank bottom. Each of these installation patterns is illustrated in Figure 2 on the next page and takes place in the sand electrolyte which isapproximately four to six inches deep.

ELECTROCHEMICAL PROPERTIES OF ZINC: Galvanic Efficiency: 90% to 95% Current Capacity-Ampere-Hours/Lb. 372 Consumption-Actual-Lbs./Amp. Year Plattline II: 26.2* Solution Potential, volts to saturated Copper/Copper Sulphate Electrode -1.1 *At 90% Efficiency

FOR ABOVE GROUND STORAGE TANK BOTTOMS
Figure 2 - Plattline™ can be used in three different patterns underabove ground storage tanks.
Tank Wall Zinc Ribbon Anode

Cable to Tank Tank Wall Test Station Reference Electrode Sand

Test Station

Reference Electrode Sand

Zinc Ribbon Anode

Tank Wall Zinc Ribbon Anode

Test Station

Reference Electrode

Sand

Figure 3 - New Tank Bottom Installation.
Sand Electrolyte

Tank Wall Replacement Tank Bottom Wires Connecting Anodes to TankPlattline™ Zinc Ribbon Anodes Polyethylene Liner

Grade

Original Tank Bottom

Concrete Ring Tank Wall Tank Bottom Wire Connecting Anodes to Tank Sand Electrolyte

Figure 4 - Tank Bottom Replacement Installation.

Grade

Pipe

Plattline™ Zinc Ribbon Anodes Polyethylene Liner

Concrete Ring

PLATTLINE™ ZINC RIBBON ANODES
Product Data Sheet

Plattline™ zinc ribbon anodes are...