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STEP 1
The Loresco® Replaceable Deep Anode (RDA) System is positioned on a busy street corner. The gas line being protected serves residential and commercial customers.
STEP 2
The deep groundbed is positioned within the right of way of the public street. Purchasing ROW was not necessary.
STEP 3
This angle shows the congestion of the location. A deep groundbed was the best system choice for the site. Note the materials for the deep groundbed lying on the ground.
STEP 4
The materials being placed on site are Loresco SC·3 backfill and RDA casing. A replaceable system was selected for economy and control. Go to Replaceable Deep Anode to see a drawing.
STEP 5
The deep anode installation required a portable pit to reduce the mess of construction in the congested area. Since the system is replaceable, the difficulty of heavy construction will be avoided in the future.
STEP 6
A deep anode system installation was also utilized at this site due to the presence of high resistance sand at the surface. This photo shows the sand encountered at the surface. The sand extended approximately 80 feet.
STEP 7
The portable pit must be continually shoveled clean during the drilling process. The soil waste is shoveled into a trailer to keep the site clean.
STEP 8
A pilot hole is drilled first to determine the final depth. Drilling a pilot hole prevents overdrilling when exact formation locations are not known. At this location the final depth was estimated to be between 200 and 300 feet. The pilot hole indicated that a final depth of 200 feet would be adequate.
STEP 9
Drilling is a difficult and time consuming process of removing waste and adding drill pipe. Utilizing a replaceable system for the initial installation prevents the need to reexperience this time consuming process for future maintenance of the site.
STEP 10
Water is added during drilling process. As soil waste is removed, the bore hole must be kept full of fluid.
STEP 11
The casing shown on the right of this photo represents all the materials necessary to build a Replaceable Deep Anode System. The active portion of the deep groundbed contained forty feet of perforated plastic casing. Solid plastic casing from the active zone upward maintains hole integrity.
STEP 12
Construction in a congested area with traffic is difficult and expensive. By installing a Replaceable Deep Anode System, the difficulty and expense are eliminated in the future. The added cost to make this site replaceable was $621.00.
STEP 13
As the pilot hole is drilled deeper, soil consistencies change. Low resistivity clay was encountered at a depth of 80 feet and continued to a depth of 200 feet. This photo shows the extracted clay.
STEP 14
The pilot hole was drilled until a depth of 200 feet was reached. Note how clean the use of a portable pit and waste trailer has kept the site. Construction in congested sites requires extra effort. Deep groundbeds fail. Current requirements are continuous. The use of a Replaceable Deep Anode System is very economical and makes replacement easy.
STEP 15
Once the estimated depth is reached by the pilot hole, the fluid is circulated to remove all cuttings.
STEP 16
After circulating, the drill stem is removed from the hole.
STEP 17
To confirm the resistivity and the location of the clay, a resistance log is taken. This photo shows a five foot pin attached to a wire which will be lowered into the pilot hole. The resistance profile confirmed the 200 foot completion depth.
STEP 18
The five foot pin is connected to a long lead wire to allow the pin to be lowered continuously into the test hole.
STEP 19
This photo shows the five foot pin being lowered on a pulley. A resistance reading will be taken in five foot increments.
STEP 20
Reading every five feet allows for a resistance profile to be developed for the pilot hole. The resistance profile is used to position the deep groundbed system. Logging of the hole takes about 20 min.
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