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How often should we change out our kettle?

Dr. Garv. recommends that you change out your kettle once a month or when the kettle fails, whichever comes first. Also, you should throw away the old, dirty zinc and use only new, clean zinc. Obviously, there is no quick answer to your question. Some of the factors that influence kettle life include:

Vasca Di  Zincatura 893X502
  • age
  • production throughout
  • operation temperature
  • heating system
  • operating capacity

There's no question that kettles are lasting longer today than they did a decade ago; due mainly to better burner technology and lower operating temperatures. The AGA 1991 Process Survey showed an average kettle life among its member galvanizers of 5 to 7 years; some even had a life of ten years. For kettles with a molten zinc volume of 800-1100 cubic feet, the average throughout during the life of the kettle is 50,000- 75,000 tons of steel galvanized. As you can see, there is no stock answer to your question. But if you feel uncomfortable with the information contained in the survey, just stick with Dr. Galv's earlier recommendation of 30 days.

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