Re: [TCML] Thumping Water Pipes

[Steve Ward <steve.ward@xxxxxxxxx>]

I'd tend to think the copper pipe was sparking elsewhere which caused the
vibration.  I dont think there is enough current to cause much magnetic
force to come into play.

While "magnetostriction" is a ferrous thing, i think you can still have
lorentz forces act internally to a conductor, just like 2 parallel wires
carrying current in the same direction will want to move towards eachother.
I can certainly hear and feel the vibrations from my DRSSTC primary when its
pulsing away at 1500A.

Steve

On Mon, Mar 15, 2010 at 10:32 AM, Dave Leddon <dave@xxxxxxxxxx> wrote:

> At 04:04 AM 3/15/2010, you wrote:
>
>> >...  The discharge from the coil
>> > was striking a ground pole which was connected to a ground rod driven
>> > through the cement floor about one foot from where the water supply
>> > exits the ground and enters the garage.  When I grounded the strike
>> > pole to a different ground rod on the opposite side of the garage,
>> > the effect was greatly diminished, so I'm guessing that current
>> > passing through the pipe creates a magnetic pulse which reacts to the
>> > earths magnetic field but I thought that I would ask the experts for
>> > a more definitive answer.
>>
>>    I would think not the Earth's field, as such, as this is
>>    quite weak.  Rather: enough current in a conductor can
>>    change its size/shape: cf nagnetostriction
>>
>
> But I thought that magnetostriction was a property that applied only to
> ferromagnetic materials and in my case the all of the pipe involved is
> copper.
>
>
>     This can result in audible effects.
>>
>>    best
>>     dwp
>>
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