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Backfill
LORESCO
DW-1®
Earth Contact Backfill
For
impressed current surface systems and light duty
semi-deep anode systems.
Typical
horizontal installation
Loresco type DW-1 is a sized carbon backfill with
particles ranging between 0.1 to 1 mm. DW-1 weighs
74 lbs per cubic foot and sinks readily in water
or light mud. The fixed carbon content of DW-1 is over 99%.
Being a sized and predominantly
round material, DW-1 may be installed by either pumping or
pouring. Approximately 7gallons of water per 100 lbs of backfill should be utilized when pumping. DW-1 wets
easily, and only minimum agitation is necessary before
pumping.
Installation
Loresco DW-1 may be poured
freely into dry applications. Tamping is not required. When it
is applied by pumping, the recommended method is to pump from
the bottom of the bored hole upward. After the application
pipe (a 1" steel pipe) is lowered down to the bottom of
the bored hole, it is coupled to a 20 GPM pump with a minimum
capacity of 250 psi. Normally, the application pipe does not
have to be raised during pumping procedures.
Horizontal Installation
Procedure:
- Have a reasonably clean
ditch (design usually calls for a ditch one foot wide).
- Pour Loresco DW-1 in a
continuous layer six inches deep (or as specified).
- Place anodes on top of DW-1.
- Pour DW-1 in a continuous
layer 6" deep until anodes are covered by a 6" backfill cover (or as specified).
- Fill the remainder of the
ditch as specified.
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Vertical Installation
Procedure:
- Have a reasonably clean hole
(depth depending on soil resistivity).
- Place one foot of DW-1 in
bottom of hole.
- Lower and center anode in
proper position.
- Pour DW-1 over anode until
design level is reached.
- Fill remainder of hole as
design specifies.
Specifications
- Fixed
carbon: 99.93%
- Ash: 0.6%
- Moisture:
0.05%
- Volatiles: Nil at 950°C due
to calcination
in excess of 1200°C.
- Bulk density: 74 lbs per
cubic foot.
- Particle sizing:
From 0.004 inch to 1 mm.
Shipping
& Storage
Loresco DW-1 is shipped in 50
lb (22.7 kg) coated, woven polypropylene bags.
DW-1 may be stored outside for limited periods (not to exceed
400 hours of sunlight). Pallets are available with
50 bags per pallet. Proven export packaging is also
available.
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Dry Volume of Loresco Type DW-1
Required
by Cylindrical Hole Size
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Hole diameter |
Cubic ft. of DW-1
per lineal foot |
Lbs of DW-1
per lineal foot |
Lineal feet per
100 lbs of DW-1 |
4"
6"
8"
10"
12" |
0.087
0.196
0.349
0.545
0.784 |
6.4
14.3
25.5
39.8
57.2 |
15.70
6.99
3.93
2.51
1.75 |
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