Re: pin holes in pipe
Posted by Bud..Suncoast Plumbing on March 10, 1999 at 20:26:04:
In response to Re: pin holes in pipe
Dale:--I am sending you the information that you request by E-Mail.
As for Mr. O'Kellys Resturaunt, I have yet to find pin hole damage that was directly attributable to the grounding of the common leg of a Power Meter can. This does not mean that a surge from a lightning strike in the neighborhood couldn't cause a failure in the piping system.
Alternating current such as used in residential and commercial power distribution systems lacks the ability to initiate or sustain an electrolytic decomposition of the copper piping.
There are some occasions when a DC power supply or source is improperly grounded to a piping system with disaterous results. We had a non-stop battle with pin hole leaks at the Garage for the County Transit Authority. There was a large DC rectifier used for recharging the batteries in the "smog free" down town electric busses. The rectifier...because of its' design, improper use, or grounding was inducing a high DC electrical potential into the piping under the slab. After many pin hole events and floor repairs, the culprit rectifier was identified and isolated from the plumbing system.
Electrolysis is accomplished by the flow of electrons in a liquid conductor. The flow is from the positive areas to the less positive. While this flow is in motion, it causes the metal to disolve into the liquid (or leach). After enough metal has been transported down the drain, a pin hole will make an unwelcome appearence. The seeds of self destruction can be built into a water distribution system by having hundreds of dissimilar metalic junctions. Each of these junctions produce a millivolt or two, but the cummulative total of all the junctions is sufficient to power the destruction process.
Desolved gasses...Acidic water...High TDS...
Alkaline water...induced or ambient DC current are all key players in the pin hole scenario.

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