2.1.5.3
Canister Contained Mixed Metal Oxide Anodes
Canister contained mixed metal oxide anodes shall be packed at the factory
in light weight, light gauge steel uni-body TIG welded canisters with
calcinated petroleum coke breeze. The canisters shall be capped with TIG
welded steel and caps providing a totally encapsulated construction. The
connecting cable shall pass through a hole in an end cap designed to be
tight fitting with a heavy duty strain relief allowing for handling of the
canister by the cable. The anode shall be centered in the canister by
centralizers to maintain rod position.
2.1.5.4
Anode Connecting Cables
Anodes shall have connecting cables installed at the factory. The
connection between the anode rod or ribbon and the lead wire shall be made
with a solid crimp couple with solder. The connection shall be sealed in
cast epoxy.
2.1.5.5
Canister Connection Cables
Canister connecting cables shall consist of an ultra low resistance solder
connection which is a minimum of three times stronger than the cable. For
ceramic coated canister anodes, the cable connection shall consist of two
molded dielectric layers (pressure seals), a flexible backfill resin
encapsulant stabilizer, a schedule 40 PVC pipe Type 1 seal, and Type 1 PVC
pipe end plugs. The seals and end plugs shall resist chlorine gas and acid.
2.1.5.6
Deep Anode Connection Cables
For deep anode beds, each anode located in the borehole shall be
accompanied by a reel of continuous cable having the length indicated. For
deep ceramic coated anode beds, anode connecting cables shall have molded
multiseal solder connections; splices will not be permitted. Chlorine gas
resistant cable and shield shall be used for chlorine environments.
2.2
RECTIFIERS AND ASSOCIATED EQUIPMENT
2.2.1
Rectifier Unit
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NOTE: Air-cooled rectifiers will be used for most
applications. Where highly corrosive atmospheres
exist, the equipment will be oil-immersed in a
tank-type housing. For hazardous area applications,
oil-immersed equipment will be provided with an
explosion-proof or dust-ignition-proof housing, as
appropriate. Transformer tap adjusters will be
provided in cases where an automatic system is not
provided.
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Rectifier unit shall consist of a transformer, rectifying elements,
transformer tap adjuster, terminal block, [one dc output voltmeter, one dc
output ammeter,] [one combination volt-ammeter,] one toggle switch for each
meter, fuse holders with fuses for each dc circuit, variable resistors, an
ac power-supply circuit breaker, lightning arresters for both input and
output, all wired and assembled in a weatherproof cabinet. The overall
efficiency of the rectifier shall be not less than 65 percent when operated
at nameplate rating and shall be capable of supplying continuous full rated
SECTION 13112A
Page 15
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