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 GALLERY PART 1 | PART 2 | Other Galleries | |
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STEP 21 The wash pipe has reached a depth of 235 ft. and has exceeded the depth of the old anode installed in 1984. The old anode is now being removed by the lead wire. Time is 11:00 A.M. |
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STEP 22 Old anode is pulled out by crew member. Note the amount of wire that has been pulled out and placed beside system. Wash pipe is removed after old anode removal. |
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STEP 23 This is the connection between the copper lead wire and the old Pt-Ti-Cu anode. The connection did not fail, and the lead wire is in excellent condition. |
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STEP 24 System failure was caused by the consumption of Pt. and penetration of the Ti. After 16.5 years of operation the failure was expected. |
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STEP 25 The old anode wire is stretched down the street and measured. |
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STEP 26 The old anode wire is rolled up. All of the old wire and anode were recovered during rejuvenation. |
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STEP 27 Crew member holds new anode which is ready for installation. The new anode is a 50 ft. length of .125 in. Pt-Nb-Cu attached with a single No. 8 HMWPE lead wire. The wire has been pre-measured to place the anode between 185 to 235 ft. |
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STEP 28 The new anode is bent and hooked on the end of the first wash pipe. The wash pipe is then lowered for the second time into the deep anode system with the anode lead held tight to prevent the hook from falling out of the wash pipe. Time is 11:30 A.M. |
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STEP 29 The new anode is lowered into system. |
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STEP 30 Additional sections of wash pipe are added and lowered into the casing until the anode reaches a depth of between 185 and 235 ft. Water pump is shut off during lowering. |
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STEP 31 When anode is correctly positioned, new Loresco SC3 is mixed and pumped down wash pipe. The lead wire is held tight by looping it around a hitch pin attached to the truck. |
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STEP 32 Adding first bag of Loresco. Time is 12:00 noon. |
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STEP 33 Additional bags of Loresco are mixed with the aid of shovels during the pumping process. Note lower water level. |
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STEP 34 Crew members continue to mix the Loresco and water as it is pumped down the wash pipe. Loresco travels down the wash pipe and fills the void around the new anode. |
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STEP 35 Crew continues to pump the Loresco mixture. The fluid level drops in the tub showing backfill being pumped into the system. |
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STEP 36 The crew nears completion of the pumping process. |
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STEP 37 Once the pumping of Loresco has been completed, the wash pipe is removed. The lead wire is allowed to slacken by removing it from the hitch pin. Then, the wash pipe is removed one section at a time from the casing, leaving behind the new anode which is held in the correct position by the surrounding Loresco. |
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STEP 38 This photo shows the site after all the wash pipe was removed and the equipment was taken off site. The new anode lead has been pulled through an underground conduit to the rectifier (out of picture on the left). Note that there is no mess. |
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STEP 39 The single anode lead is hooked up to the rectifier. Initial resistance was 0.9 ohm. |
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STEP 40 The rejuvenation was finished at 1:30 P.M. The system was energized on June 21, 2000 allowing 24 hours for the backfill to fully settle. |
