Pipeline Corrosion Control

DW-1 Earth Contact Backfill (Coke Breeze) by Loresco

Created by: Pipeline Corrosion Control

Last updated 11/2025

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Description

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. Specifications Fixed carbon: 99.93% Ash: 0.6% Moisture: 0.05% Volatiles: Nil at 950°C due to calcinationin excess of 1200°C. Bulk density: 74 lbs per cubic foot. Particle sizing: From 0.004 inch to 1 mm. Shipping and 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. Dry Volume of Loresco Type DW-1 Required by Hole Size Hole diameter Cubic ft. of DW-1per lineal foot Lbs of DW-1per lineal foot Lineal feet per100 lbs of DW-1 4"6"8"10"12" 0.0870.1960.3490.5450.784 6.414.325.539.857.2 15.706.993.932.511.75 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. 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. Typical horizontal installation Typical vertical installation