Zinc has proven to be an excellent Anode Material for Cathodic Protection and grounding. To overcome the small impurities which are always present in the base material, conventional Zinc Alloys contain Aluminium. Zinc Anodes have been in use for decades to protect Steel Structures from Corrosion . Today, these anodes are still widely utilized and have proven to be an effective choice for preventing corrosion in selected soils and brackish waters, as a grounding electrode for AC mitigation applications.
Electrochemical Properties: Open Circuit Potential (-v) 1.05 w.r.t Ag/AgCl, Current Capacity (Amp - hr / lb) - 372, Galvanic Efﬁciency (%) = 90 - 95
Zinc Grounding Cell
Zinc Grounding Cells consist of one , two or four Standard Zinc electrodes separated with 1” Insulating Spacers (for more than 1electrode). Nominal resistance of a two electrode Grounding Cell in wet area is 0.2 to 0.6 Ohm. Nominal Resistance of a four electrode cell is one fourth to one half that of a two electrode cell. The Grounding Cells are packed in standard backfill (75% Gypsum, 20% Bentonite and 5% Sodium Sulphate) either in a unit of one, two or four.
Zinc Grounding Cells are used for AC Mitigation. This is used to bleed off AC from the structres , which are subjectto induced AC . Zinc Grounding cell can be installed at high voltage O/H crossing or parallelism locations.
Zinc Grounding Cell
|Composition (ASTM B 418 TYPE 1)|
|Cd||0.025 to 0.07|
|Potential||-1.05 volts w.r.t Ag/AgCl|
|Capacity||780 amps Hr./Kg.|
Polarization Cell Replacement
Polarization Cell Replacement (PCR)
PCR is a solid-state device designed to simultaneously provide DC decoupling and AC Continuity/grounding when used with cathodically protected structures, such as pipelines, tanks, grounding systems, and cable casings. The PCR has very high AC fault current and lightning surge current ratings. Polarization cell replacement (PCR) are used in conjuction with grounding cells.
Isolation Flange Kits
Isolation Flange Kit
Isolation Flange Kits are used in flanges to isolate the protected and unprotected sides of the pipeline. It consists of non metalic gasket, washer,sleeve and metalic washer.
Surge Arrestors are used to bypass the surges between isolated structures and protect the insulating materials.