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Return to cluster rules

I'm skipping the lower-right corner which is when you have no clustering at all in time or space - breaks years apart spread across the main; for us, that's an obvious if low-priority anode retrofit; most people would do nothing unless they have the really terrible rule of replacing at a certain number of total breaks. Once you prove that only recent breaks predict future ones, that becomes crazy.

The last case we'll go over with examples is where the cluster is close in space but spread out over time. Since the problem is small in area, you can replace just a portion and anode-retrofit the rest.

© Roy Brander, P.Eng 2016