Zinc Grounding Cells

Pre-packaged zinc grounding cells provide positive, long-life protection wherever voltages must be limited in underground metallic systems to reduce danger of shock or arcing and burning of insulated joints. 

Typical grounding installations include oil, gas and water pipelines, power stations, oil storage tanks and transmission line towers and cables.
  • Unprotected Pipe
  • Insulated flange
  • Cathodically protected pipe
  • Insulated copper wires connecting zine anodes and pipeline
  • Two 60" zinc anodes separated by Isolation spacers
  • Low resistance backfill surrounding zinc anodes


Cut-away view of a two anode grounding cell installed to protect an insulated flange of an underground pipeline.
Features
  • Two or four anode units available
  • Pre-packaged for easy installation in sturdy cardboard tubes with wood ends
  • Anodes are 1.4" x 1.4" x 60" HI-PURE™ ZINC SEPARATED BY 1" SPACERS AND TAPE WRAPPED
  • Zinc anode composition conforms to ASTM B-418-73, Type II
  • Low resistivity backfill, 75% gypsum, 20% bentonite, % sodium sulfate
  • Six feet of insulated No. 6 AWG stranded copper conducter silver brazed to 1/4" diameter steel core rods.
TYPE DIAMETER OVERALL APPROXIMATED
GROSS WEIGHT
(including backfill)
Two
Anode
Unit		 7" O.D. 75" 185 pounds
Four
Anode
Unit		 7" O.D. 75" 230 pounds

Nominal resistance of two anode grounding cell when permeated by groundwater is in the order of 0.2 to 0.6 ohm.  To obtain cell resistance of a lower order, four cross-connected zinc anodes can be used.  Generally, the resistance of a four anode unit will behalf of a two anode unit.