This article was posted 11/20/2006 and is most likely outdated.

Newsletter Member Needs Help
 

 
Subject - Newsletter Member Needs Help

November 20, 2006  

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Newsletter Member Needs Help

Mike,
In December of 2005 I had two water leaks in my front yard, caused by pin-hole leaks in my copper water line. The leaks in the pipes were from the street to the house, thus the responsibility to repair was left up to me and not to the water supplier. My home is 4 years old and I do not understand why I should have such a problem with a newer home.

I called a plumber to repair the two leaks and from what he says it appears to be either a problem with bad copper piping or electrical current going through the copper pipes. Because I was not the original owner of the home, but the second owner, the builder said they were not responsible to repair the leaks. Remember, this was back in December of 2005. Well, this week my neighbors on both sides of me have encountered the same problem with water leaks. Although they have not had their problems repaired yet, the plumbers that have looked at their leaks do confirm that it is again, either bad pipes or electric current passing through the pipes. I do have a ground wire running from my electrical box and grounded on the inside to the copper water pipe line.

Also I have found out that all the wiring (i.e. phone, cable, gas, electric) is in a tunnel ditch going across the copper water line from the water meter to my house. I live in Kentucky were the building codes permit such utilities to be tunnel placed as such.

Mike Holt Comment: It's my understanding, based on studies by the American Water Works Association (AWWA), that alternating current flow does not create this problem. I'm willing to change my opinion if someone has a study to support the claim that pin hole leaks can be created in metal piping because of current flow. Do you have any thoughts?

 

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Comments
  • From the information presented it points towards an electrolis problem which could be caused by a local pipeline that has cathodic protection and is causing a current flow in the earth. If this is cause the copper pipe will be eroded on one side only i.e. the leaks on one side of the tubing which is caused by the copper being plated on one side the removed from the other side.

    If the house has improper grounding system and is using the copper pipe, the an insulating section needs to be installed in the copper line before it enters the house. This will cause the currents to flow to the ground rod at the meter entrance.

    A test can be made by disconnecting the copper water pipe from the house and connecting a meter to read the voltage between the house and copper tube. Next take a current reading. The data obtain from the readings can be used to better refine the problem and the solution to resolved the problem.

    Hope this sheds some light on the issue.

    P.S. Cathodic protection can cause large current flow in the ground and if it is nearby, you can expect it to be flowing in the ground.

    John D. Rowland Sr. P.E.

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