Bonding water pipes in treatment plants

[sparkingone]

We are working on a waste water treatment plant expansion. NEC 250.104 speaks of water piping system which I take to mean the water supply for a building. I think the water pipes which are used to process the waste water would fall under the other metal pipes in this article. Anybody have experience in this area?

 

[George Stolz]

No experience, but I would think 250.104(B) would apply, same as the drain pipes in any house - sized to the OCPD that you think might energize it. Just my off-the-cuff thought.

Edit to add - I bet the assembly of the pipes is very electrically continuous, too, just guessing.