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Zinc Bolt Caps

Zinc Bolt Caps

 Cap it, Bury it, Forget it.

  • Zinc Caps confer excellent cathodic protection to iron mechanical joint fitting and gland ring assemblies.
  • Increasing the number of Zinc Caps marginally increases the degree of protection.
  • Increasing the number of Zinc Caps greatly increases the length of protection. 

Control Tee after immersion for 1004.5 hours & removal from bath.  Close up of ductile iron bolt showing corrosion.
Elbow protected with 2 zinc caps after immersion in salt solution for about 1100 hours. Solution drained.  Close-up of ductile iron bolt with zinc cap after rinsing off silt & flange, but not from zinc cap. Note complete protection of ductile iron nut, bolt, & flange.

 

Soil Resistivity
Ohm-Cm
2 Caps 6 Caps 12 Caps
1000 5 years 20 years 35 years
2000 7 years 30 years  50 years
3000 10 years 40 years  65 years
4000 12 years 55 years  90 years
5000 16 years 70 years  110 years
6000 20 years 85 years  140 years
7000 25 years 95 years  165 years

 The life expectancy of 90 P 190 "Protecto-Caps" installed on a buried
Ductile Iron 90 degree 150 mm bend, with average coating.

 

 

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