A fast AST cathodic protection system design and quote enables MATCOR to quickly manufacture an accurate, reliable impressed current cathodic protection system for your above ground storage tank application.
This ease-of-use and quick response philosophy is consistent with MATCOR's Tank Ring Anode System, which utilizes patented Kynex® waterproof connection technology, and is safe and easy to install in a matter of hours.
Design Your Tank Bottom Cathodic Protection System in Minutes
This free productivity tool enables you to quickly design your tank bottom cathodic protection system in 3 easy steps.
1.Enter your contact information.
2.Enter specifications for your above ground storage tank and installation environment. When your'e ready for a quote...be sure to check the quote box.
3.The app delivers your detailed tank ring anode cathodic protection system design specifications to the email address provided in Step 1.
If you've requested a quote, you will receive it within about 48 hours.
A fast AST cathodic protection system design and quote enables MATCOR to quickly manufacture an accurate, reliable impressed current cathodic protection system for your above ground storage tank application.
This ease-of-use and quick response philosophy is consistent with MATCOR's Tank Ring Anode System, which utilizes patented Kynex® waterproof connection technology, and is safe and easy to install in a matter of hours.
Tank Diameter
This is the diameter of the tank bottom and is used to calculate the total surface area
of the tank bottom. Typical tank diameters range from 20 feet (6.1m) to 300 feet
(91.4m) in diameter.
Current Density
This is the amount of current per unit of area that is anticipated as being needed to
properly cathodically protect the tank bottom. For higher resistivity good quality sand
backfills the current density used is typically 1 mA/ft2 (10 mA/m2) and ranges up to 3mA/ft2
(30 mA/m2) for lower resistivity or poorer quality soil backfills. Many clients have been
specifying 2mA/ft2 (20 mA/m2) as the default design basis even when using a good quality
backfill. This should be a safe value for most applications unless the backfill material
is of poor quality.
Sand Resistivity
This value represents the resistivity of the backfill that is being used between
the anode and the tank bottom (typically a sand backfill although native soil or
screened soil can be used as well.) Typically, the resistivity value does not affect
the anode system design (i.e. number of anode rings) itself. The resistivity value
is used to calculate the overall system resistance and the required minimum voltage
needed for the rectifier. If the resistivity value is not known – MATCOR recommends
that the system rectifier not be ordered with the system and that field-testing be
performed to size the rectifier.
Minimum Depth of Anode
This is the depth below the tank bottom plate that the anode will be placed.
MATCOR generally recommends a minimum depth of 1 foot (0.3m) for most applications.
This provides sufficient anode depth to allow for good current distribution and
avoids concerns of the anode coming in contact with the tank bottom plate.
For applications with less than 1 foot (0.3m) of cover, the anode spacing is
reduced significantly, increasing the total anode required.
For those applications with less than 1 foot (0.3m) of depth between the anode
and the tank bottom, MATCOR has developed the SPL-SandAnode™ that is packaged
with sand instead of coke backfill to reduce the risk of the anode contacting the
tank bottom and creating an electrical short. Please contact MATCOR for more
information on the SPL-SandAnode.
Tank Operating Temperature
MATCOR’s design program uses a temperature correction factor that increases
the current required for applications where the tank operating temperature exceeds
30 °C (86 °F.) The current required increases 25% for every 10 °C above the ambient
temperature of 30 °C. For elevated temperature applications above 80 °C , special
consideration should be given to the anode cable materials – please contact MATCOR
Engineering.
Design Life
MATCOR strongly recommends that a design life of 50 years be used for all new
construction tanks – the incremental cost for this extended life is very low.
Rectifier Margin %
This is the percentage amount by which the rectifier will be oversized based
on the calculated current requirements and anode system resistance.
The rectifier DC current output rating is calculated by taking the current
required and multiplying by (1 + the design margin) and rounding this value
up to the nearest multiple of 5. The rectifier DC current voltage is calculated
by multiplying the current required (I) x the total resistance (R) and then
multiplying this value by (1 + the design margin) and rounding this value up to
the nearest multiple of 5.
Cable Tail Lengths
This is the length of cable on each anode segment end that will extend beyond
the edge of the tank bottom. With the assumption that the junction box is located
at the edge of the tank, the default value is 20 feet (6.1m). This value can be
changed to accommodate anticipated junction box locations.
Explosion Proof
This is a generic term for equipment (rectifiers and junction boxes) to be
located in hazardous locations. Please note that enclosure ratings and local
regulations can vary significantly and affect the design of rectifiers and
junction boxes. Please contact MATCOR Engineering for additional information.
