Electrolysis Damage Story - repairing the damaged pipe [RE-wrenches]

[Kent Osterberg]

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As far as a repair of the existing pipe goes a new 5" schedule 80 pipe 
inside the existing 6" pipe comes closest to the bending strength of the 
original pipe.
Here is a comparison of the bending strength for several repair options:

six one-inch rebars with concrete ...... 51%
eight one-inch rebars with concrete ... 68%
5-inch schedule 40 insert .................. 64%
5-inch schedule 80 insert .................. 87%

A less attractive but effective and cheaper repair would be a 24-inch 
diameter reinforced concrete collar extenting from the original concrete 
up 18" past the damaged area.  Eight 1/2" pieces of rebar in holes bored 
into the original concrete will allow a solid connection to the original 
foundation. 

Kent Osterberg
Blue Mountain Energy

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