By T.H. Lewis Jr.
With over twenty years of sensible box deploy adventure, the writer discusses the various parts the most important to the good fortune of your deep anode method by means of accumulating facts, acting layout calculations, identifying particular fabric and strategies, and making plans the install strategy. This e-book offers layout engineers with a single-source consultant for designing, fitting, and working deep anode structures. Many engineering judgment judgements and a few attainable recommendations on hand with a sign of the standards that impression the actual selection for a selected layout are mentioned. The e-book additionally elaborates on how making the best engineering judgment choice relates on to the winning layout of your process.
desk of Contents
2. collecting layout details
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Additional info for Deep Anode Systems - Design, Installation, and Operation
Baechmann and Schwenck, however, developed an equation with a variable depth-ofburial term. 2,the resistance-to-earth of a design with a specific active column length and diameter can be estimated based on the anticipated layer resistivity. If the estimated resistance is unacceptable, either the active column length must be increased, the diameter must be increased, a lower layer resistivity must be found, or multiple parallel columns must be employed. Generally, increasing the column diameter will have only a very small effect on the overall resistance compared to the other variables.
Using this technique, the joint with the “long nipple” can be disconnected after carbon backfill placement by MATERIALS SELECTION 35 slow rotation of the piping string from the surface. If a steel piping support is used, it can serve as the conduit to pump the carbon backfill into the deep anode system from the bottom of the hole upward. 3 Centralizers To ensure that each anode is surrounded by carbon backfill, a device to center the anode in the drilled hole may be employed. The centralizers may be attached to the anode surface, the anode lead wire, or an anode support structure.
The discharge surface area can be increased by either increasing the diameter or the length of the active column. Of course, increasing the length of the active column beyond the limits of the low-resistivity strata is of no benefit since current discharge will be effectively confined to the low-resistivity strata. Therefore, once the length of the column is at its maximum value as determined by the existing geology, either the diameter of the column must be increased or multiple columns must be considered.