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Deep well anodes for electrical grounding

a technology of deep wells and anodes, applied in the direction of connection contact material, sealing/packing, borehole/well accessories, etc., to achieve the effect of minimizing or eliminating the vertical flow of groundwater and sufficient electrical conductivity

Inactive Publication Date: 2006-01-12
SAE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a deep well anode for electrical grounding that has a central metallic anode encased and protected by a cementitious sheath and backfill. The sheath / backfill provides sufficient permeability to allow by-product gases to escape while maintaining long-term operation of a cathodic protection system, while minimizing migration of groundwater. The deep well anode system exhibits the attributes of high electrical conductivity, physical strength, performance under a wide range of current densities and rates of gas evolution, resistance to corrosive gases, cost of manufacture and use comparable to existing deep well anode systems, and minimal environmental impact. The invention also provides a method for preparing deep well anodes with the desired properties.

Problems solved by technology

(v) cost of manufacture and use comparable to existing deep well anode electrical grounding systems.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

Permeability and Strength of Various Carbonaceous Cement Compositions

[0040] To obtain these results carbon and cement of a combined weight of 200 grams were dry blended and sufficient water admixed to obtain a smooth paste. This paste was then packed into standard 2″×4″ test cylinders. The different compositions were allowed to cure under moist conditions for 28 days after which they were removed and tested. The table below illustrates some typical results that may be obtained by using various types and ratios of carbon with siliceous cements. The strength shown refers to compressive crush in lbs per square inch (psi). Permeability was obtained by immersing the samples in cold water and measuring the weight increase. The value shown is the slope of the linear curve obtained by plotting % increase against the square root of time. These particular examples were obtained using two grades of coke breeze supplied by Hickman Williams, Canada in which the particle size distribution varied...

example 2

Conductivity and Electrolysis of Various Carbonaceous Cement Compositions

[0041] Cement compositions prepared and compacted into a 2″×4″ test cylinder as described in Example 1. A 7 strand, 8 gauge copper wire was then positioned in the centre of the cylinder such that the lower end of the wire was 1″ from the bottom of the cements, and held in that position until the samples were hard. In each case the upper exposed portion of the wire was then coated with a water resistant rubber composition, and after curing for 28 days, each sample was placed within a 5 litre container containing a solution of 10% sodium sulfate. An electrical circuit was then completed by using a Topward Model 3306 variable current power supply, in such a manner that the test sample was the anode, and a 24″×½″ steel rod was the cathode. Sufficient voltage was then applied such that a direct current of 0.5 amps would flow through the circuit. It was found that suitable current could be generated with all samples...

example 3

Permeability, Conductivity and Strength of Various Compositions of Semi-Permeable Carbonaceous Concrete Modified with Fatty Acid Additives to Improve Water Resistance

[0042] In this experiment samples were prepared and cured as described above for 28 days. The results shown here were obtained using the sodium soaps of Pamak C4, a distilled tall oil fraction manufactured by Hercules Canada (Burlington, Ontario). In this experiment a 25% solution of soap was admixed with the water used to prepare different slurries of the carbonaceous cement. These were then transferred to standard 2″×4″ cylinders for curing. The test cylinders were then removed from the moulds, dried under ambient conditions for 7 days and weighted. Each was then immersed from water for four hours after which it was removed from the water, dried with a paper towel and weighted again. The results tabulated below show the increase in weight due to absorption of water for samples containing different quantities of soap....

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Abstract

Two related approaches are provided to controlling the relative permeability of ground water and gases developed in deep well anodic installations. The central metallic anode is encased and protected by a semi-permeable conductive cementaceous sheath, using as the sheathing material any of a number of compositions having the desired properties of permeability and conductivity. Alternatively, a conductive but impermeable anode is used in conjunction with a semi-permeable backfill material in a bore hole of a deep well anode installation, thereby achieving the same desired ends of controlling the relative permeability of water and gases in the installation.

Description

RELATED APPLICATION [0001] This application is a continuation-in-part of U.S. patent application Ser. No. 10 / 643,149 filed on Aug. 19, 2003 and entitled CONDUCTIVE CONCRETE COMPOSTIONS AND METHODS OF MANUFACTURING SAME, which claims priority based on U.S. provisional patent application No. 60 / 404,129, filed on Aug. 19, 2002, both of which are hereby incorporated herein in their entirety, by reference.BACKGROUND OF THE INVENTION Electrical Grounding Techniques Generally [0002] Various electrical grounding techniques are utilized throughout the world for the prevention of electrical damage to buildings and equipment. Such grounding techniques find numerous applications in such diversified areas as power and telecommunication systems, electronic equipment, fuel storage tanks, industrial installations, commercial and residential buildings as well as buried equipment such as pipelines. The grounding techniques are also used to protect the buildings or equipment from a variety of electri...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): E21B33/13C04B28/04H01B1/18H01R4/66
CPCC04B28/04C04B2111/94H01B1/18H01R4/66C04B14/022C04B18/24C04B24/08C04B40/0028C04B16/0625C04B14/024C04B14/42C04B16/065Y02W30/91
Inventor SIROLA, D. BRIENHAGENS, GRAHAM
Owner SAE INC
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