between the canister and the wall of the hole shall be completely
backfilled with a wet slurry of earth free of stones.
3.2.1.5
Cable Protection
Positive cable to the ground bed and negative cable to the [pipe] [tank] to
be protected shall be buried a minimum depth of 750 mm 30 inches except
where above ground construction utilizing conduit is used.
3.2.1.6
Multiple Anode Systems
Multiple anode systems shall consist of groups of anodes connected in
parallel to a header cable, buried in the ground at depths, spacing, and
locations shown. The anodes shall be buried [horizontally] [vertically].
3.2.1.7
Distributed Anode Systems
Distributed anode systems shall consist of a line or row of anodes
connected in parallel to a header cable and buried in the ground parallel
to the pipeline. The anodes shall be at the pipeline at depths, spacing,
and locations shown. The anodes shall be buried [horizontally]
[vertically].
3.2.2
Deep Anode Ground Beds
Deep anode ground beds shall consist of an installation of anodes supported
one above the other and supported in place by a method that does not
suspend the anodes from the connecting cable. Deep anode ground beds shall
be installed in accordance with NACE RP0572 and as specified in these
specifications.
3.2.2.1
Anode Centering
Anodes shall be centered in the well by means of centering devices.
3.2.2.2
Casing
The casing shall be to a depth and elevation of not more than [_____] m feet.
3.2.2.3
Casing Insulation
The portion of casing above the top anode shall be coated with an
electrically insulating underground type coating.
3.2.2.4
Anode Requirements
Anode sizes, spacing, number of anodes, depth of well, and other details
shall be as shown.
3.2.2.5
Anode Lead Wire
Each anode shall have a separate, continuous wire extending from the anode
to the junction box at the well head.
3.2.2.6
Anode Cables
Anode cables shall terminate in a nearby junction box, equipped with
individual anode current shunts. Where full length casing is used, two
wire connections from casing shall terminate in the junction box.
SECTION 13112A
Page 29
Previous Page
