Norwalk firefighter Charlie Hillman sent me this picture of some significant calcification in an old ductile iron main.  Think about the following questions:

  • How does this effect our water supply?
  • Besides the water department having a break in the line or a customer noticing a decrease in water, how can we discover this problem?
  • Does the calcification increase or decrease pressure to hydrants?
  • My guess is this is a 16″ main that is decreased down to about a 6″.  What’s the difference in volume?

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