QUICK NAV:
When this button is selected the program will provide a design for anodes uniformly distributed along the pipeline.
When this button is selected the program will provide a design for all anodes located in a single groundbed.
Enter the length of the structure in feet. Used to calculate surface area to be protected. Surface area is used to calculate current requirement.
Select the Anode Type. Magnesium anodes are generally used for soils with resistivities less than 10,000 ohm-cm. Used to calculate anode life as well as current output.
Select the diameter of the pipeline expressed in inches. Used to calculate the surface area to be protected. Surface area is used to calculate current requirement.
Anode Size is used to calculate both the number of anodes required and the anode life. The length of an anode mainly affects its current output. The diameter of an anode mainly affects its life. Greater current outputs for a given weight of anode can be realized by increasing its surface area.
Select the coating quality expressed as a percent. Coating quality is the percent of the structure protected by coating. Used to calculate current requirement.
Select the desired life (in years) of the proposed cathodic protection system. Used to compute the amount of anode material required.
Select the current density (amps per sq. ft.) required to polarize the structure. Should be determined by performing current requirement tests in the field. TERRY: CAN WE PROVIDE SOME RECOMMENDATIONS ? Used to calculate current requirement.
Anode spacing is a measurement in feet. In a Multiple Anode Groundbed Design, anode spacing remains the same as entered by the user. In a Distributed Anode Design, the program will calculate anode spacing. To compute anode spacing it is assumed that the anodes are uniformly spaced along the length of the pipeline. Used to compute groundbed resistance.
Enter soil resistivity (expressed in ohm-cm.) for the area where the anodes will be buried. Strive to bury galvanic anodes in soil with low soil resistivities. Magnesium anodes are generally used in soils with resistivities less than 10,000 ohm-cm. Soil resistivity should be taken from previously gathered reliable data or should be determined in the field using The Soil Box Procedure, The Single Rod Procedure, or The Wenner Four Pin Method. Used to calculate current output.
A computed quantity. The number of square feet of structure surface area to be protected. Computed from the measurements provided above. Used to calculate current requirement.
A computed quantity. The number of anodes prescribed by this design. This number of anodes should provide the current to protect the structure for a period of time as close to the desired design life as is possible considering the parameters entered by the user.
A computed quantity. The expected time in years that the system is expected to provide the current required.This time may be less than the design life, because parameters entered by the user will not permit a cp system with an expected life equal to the design life.
A computed quantity. The total amount of current required to protect the pipeline.
A computed quantity. The expected polarized potential of the pipe.
A computed quantity. The current that this system will deliver for cathodic protection of the pipeline.
Recommendations are based on commonly accepted practices. Recommendations are in response to computed quantities or data entered by the user.
