Connecting to metal pipes for a ground is wrong, a code
violation, dangerous, and simply not acceptable. Of the many
suggestions (some do violate code), only this one is so wrong
as to require a response. Grounding to dump electricity into a
cold water pipe is absolutely not recommended.

Jeff Jonas wrote:
If you're really serious about proper grounding and
avoiding "ground loops", then add a ground wire
to the SINGLE POINT of power entry to the computers:
the UPS, power strip, etc.
A wire to a cold water pipe ought to suffice (if metal pipes),
else run a wire to a grounded stake.
Ham Radio folks ought to know all about proper grounding.