you know, I never realized that only 7 of the 8 electrodes mentioned are required to be used.
however, I would argue it is a metal undergound water pipe and thus has to be part of the GES.
The answer is still "no", see luckylerado's post above.
Below is the text of the Appendix A notes for the 2013 (latest) edition:
A.10.6.8 Where lightning protection is provided for a structure,
NFPA 780, 4.14 requires that all grounding media, including un-
derground metallic piping systems, be interconnected to provide
common ground potential. These underground piping systems are not
permitted to be substituted for grounding electrodes but
must be bonded to the lightning protection grounding system.
Where galvanic corrosion is of concern, this bond can be made
via a spark gap or gas discharge tube. [24: A.10.6.8]
A.10.6.8.1 While the use of the underground fire protection
piping as the grounding electrode for the building is prohib-
ited, NFPA 70 requires that all metallic piping systems be
bonded and grounded to disperse stray electrical currents.
Therefore, the fire protection piping will be bonded to other
metallic systems and grounded, but the electrical system will
need an additional ground for its operation.
I think if you view the last sentence in A.10.6.8.1 carefully, there is an acknowledgement that the effect may be to cause the system to be part of the GES but if otherwise it were the
only means available you would have to add at least one other means. It is, of course, much messier than it seems. For example, municipalities do not maintain separate water systems for potable water and sprinkler water. In fact, depending on the jurisdiction, you may not be
allowed to make a separate tap for the fire main. You use back-flow preventers at the service entrance and the domestic water pipe goes that-away while the fire main goes this-away. In practice I believe the idea is don't ground the 100 HP motor to the sprinkler pipe, run the EGC back to the panel or whatever.