Some soils and groundwaters contain trace amounts of sulfuric acid that eats any kind of metal water pipe over time.
I one time changed out a well pump for a female friend and this time she decided to invest in a Grundfos stainless steel submersible pump. The groundwater 30 and 40 feet down is of good quality EXCEPT for the sulfuric acid content and in her neighborhood water heater warranties are void. When I put in the pump I made provisions for hooking up an acid neutralizer which is a tank that you periodically fill with crushed marble while the water pressure is turned off.
I rather doubt that a dissimilar metal that is in the soil and which is connected to the electrical system grounds is causing the problem because copper is near the bottom of the electromotive table. Only gold, silver, and a few other elements are more electronegative than copper. The cathodic corrosion protection current for the gas line could be finding its way into the water line but I rather doubt that.
However, gas lines should be separated 3 feet horizontally or vertically from any other utility for a number of safety reasons. Besides preventing a backhoe operator from digging through electrical and gas lines at the same time, there was an instance where a water main break underneath a street forced its way into a natural gas main in a small town and all the gas appliances had water coming out of the burners just like a slapstick comedy.
I would bet that what you have is a bad factory run of copper pipe. I one time bought some chlorinated polyvinyl chloride ( CPVC ) pipe from the closest place. Every section of pipe split when I turned on the water pressure because the extrusion parameters were somehow wrongo! I took everything down and returned the defective pipe, got my money back, and bought some pipe and fittings from somebody else. Replacement pipes and fittings worked perfectly.
Mike Cole, mc5w at earthlink dot net
Michael R. Cole
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